On 5/11/2022 11:05 AM, David Billington wrote:

On 11/05/2022 18:59, Bob La Londe wrote:

On 5/11/2022 9:20 AM, David Billington wrote:

On 11/05/2022 16:41, Bob La Londe wrote:

Yesterday I found myself cleaning up a bit of square tube in
preparation for welding and later paint. It was outside, but in SW
Arizona, that just means it has developed a small amount of
protective rust over the mill scale.

I started with an angle grinder and a flap disc. It made short work
of the light loose rust, but would hardly touch the mill scale. It
also showed some rust down "in the" the mill scale. I probably
could have stopped there, but I got carried away with myself. This
stuff welds really nice if you have bright shiny metal and takes a
good paint coat as well with an etching primer, and proper cure times.

I probably I could have just used extend or some other rust
neutralizing primer after knocking off the loose rust, but this
construct will be going into a humid environment.

I noticed a fresh flap disc stripped rust, and mill scale amazingly
fast. It did more work with less effort in the first minute or two
than it did in the next ten. Now the flap disc was still nearly
new, but it was performing like one that was half worn away. There
was still plenty of grit, but the edge was mostly the flaps rather
than the grit, and the face was the same, but also gummed up with
mill scale.

I am NOT trying to get longer life out of a flap disc. I am trying
to get more time performing like the first minute or two of a new
disc. I don't care if the total life of the disc is less. Is there a
practical way to dress these so that you can expose more grit
quickly. I tried spinning it against a wire wheel on a bench
grinder. The result was less than amazing.

Sans the solution I am looking for is there a better disc for
stripping metal than an abbrasive flap disc? I can do the work with
a grinding wheel, but its much more skilled to avoid gouging the
base metal and doing damage. I tend to only use a grinding wheel to
make the bevels before welding.

I know what you're experiencing with flap discs and have used this
type of disc to good effect
https://www.weldequip.com/cleaning-fleece-115mm.htm . I've seen many
of this type for sale on ebay and most don't have a high enough speed
rating for use on a 4.5" grinder so check what you get if you try one.

I looked at that. I've seen those type of wheels before. How well
does it work on mill scale.

In my experience they deal with the mill scale on box section I've
cleaned up very well.

They are a little pricey, but I think I'm going to give them a try If
the actually work ok it may be worth it in time saved. If not then I'll
know. I'll start with one for now and if they work ok, I'll probably
buy a box of them from one of my industrial suppliers the next time I am
flush. I'll keep you guys posted on whether or not I think they are
enough better to be worth it.



--
This email has been checked for viruses by AVG.
https://www.avg.com

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 5/14/2022 9:45 AM, Bob La Londe wrote:

On 5/11/2022 11:05 AM, David Billington wrote:

On 11/05/2022 18:59, Bob La Londe wrote:

On 5/11/2022 9:20 AM, David Billington wrote:

On 11/05/2022 16:41, Bob La Londe wrote:

Yesterday I found myself cleaning up a bit of square tube in
preparation for welding and later paint.  It was outside, but in SW
Arizona, that just means it has developed a small amount of
protective rust over the mill scale.

I started with an angle grinder and a flap disc.  It made short work
of the light loose rust, but would hardly touch the mill scale.  It
also showed some rust down "in the" the mill scale.  I probably
could have stopped there, but I got carried away with myself.  This
stuff welds really nice if you have bright shiny metal and takes a
good paint coat as well with an etching primer, and proper cure

times.

I probably I could have just used extend or some other rust
neutralizing primer after knocking off the loose rust, but this
construct will be going into a humid environment.

I noticed a fresh flap disc stripped rust, and mill scale amazingly
fast.  It did more work with less effort in the first minute or two
than it did in the next ten.  Now the flap disc was still nearly
new, but it was performing like one that was half worn away.  There
was still plenty of grit, but the edge was mostly the flaps rather
than the grit, and the face was the same, but also gummed up with
mill scale.

I am NOT trying to get longer life out of a flap disc.  I am trying
to get more time performing like the first minute or two of a new
disc. I don't care if the total life of the disc is less. Is there a
practical way to dress these so that you can expose more grit
quickly.  I tried spinning it against a wire wheel on a bench
grinder.  The result was less than amazing.

Sans the solution I am looking for is there a better disc for
stripping metal than an abbrasive flap disc?  I can do the work with
a grinding wheel, but its much more skilled to avoid gouging the
base metal and doing damage.  I tend to only use a grinding wheel to
make the bevels before welding.

I know what you're experiencing with flap discs and have used this
type of disc to good effect
https://www.weldequip.com/cleaning-fleece-115mm.htm . I've seen many
of this type for sale on ebay and most don't have a high enough speed
rating for use on a 4.5" grinder so check what you get if you try one.

I looked at that.  I've seen those type of wheels before.  How well
does it work on mill scale.

In my experience they deal with the mill scale on box section I've
cleaned up very well.

They are a little pricey, but I think I'm going to give them a try  If
the actually work ok it may be worth it in time saved.  If not then I'll know.  I'll start with one for now and if they work ok, I'll probably
buy a box of them from one of my industrial suppliers the next time I am flush.  I'll keep you guys posted on whether or not I think they are
enough better to be worth it.

I still have a few pieces to cut and strip for the current project, but
before I bought anything I decided to fall back on the old standby. See
what the Doctorate's of YouTube University have to say. I was not
impressed. Stripper discs were among the popular solutions, but nearly
every one seemed to be plugging up when they actually showed them. Many
seemed to be to promote one brand over another brand, and the "better
brand seemed to already be partially plugging up when they would show
how much better it was than the old one they were using. Well duh! The
old one had been used more.

The one that sort of got my attention was an obvious SHILL for a diamond encrusted wire wheel. The thing is when I looked at what they showed it
looked to me more like they had the mill scale shiny than removed it.
This was WELD.COM. They shill products all the time, but generally they
give good information. This time the results I saw didn't seem to match
the words they were saying. Needless to say I won't be trying that
diamond encrusted wire wheel unless they send me one for free. Prior to
that they showed a Silicone Carbide flap disc that appeared to do a very
good job with relatively low pressure. The claim was that it "picks" at
the scale as opposed to being an "impact" abrasive. That may be a
distinction without a difference, but the result I could clearly see on
the piece of flat plate they were cleaning was the best of everything
they showed. That could have just been fresh disc performance. ie:
First minutes.

The only thing from all across YouTube university's "expert" pool
(except weld.com) was acid. The default "cheap" acid being white
vinegar. Not much help if you need to strip some long pieces, but not
often enough to setup a pickling trough for the job.

A few who really bragged up a product seemed to actually struggle to
just barely clean a very narrow strip along the ends prior to welding.
One then went on to weld his project and atleast one bead of every
corner overlapping the ends of square tube (not mitered) appeared to
just be burning through uncleaned mill scale. Yes I know S6 does an ok
job of burning through mill scale, but that wasn't why I watched his
video.

Sigh!

--
This email has been checked for viruses by AVG.
https://www.avg.com

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Bob La Londe <none@none.com99> wrote:

On 5/14/2022 9:45 AM, Bob La Londe wrote:

On 5/11/2022 11:05 AM, David Billington wrote:

On 11/05/2022 18:59, Bob La Londe wrote:

On 5/11/2022 9:20 AM, David Billington wrote:

On 11/05/2022 16:41, Bob La Londe wrote:

Yesterday I found myself cleaning up a bit of square tube in
preparation for welding and later paint.?? It was outside, but in SW >> >>>> Arizona, that just means it has developed a small amount of
protective rust over the mill scale.

I started with an angle grinder and a flap disc.?? It made short work >> >>>> of the light loose rust, but would hardly touch the mill scale.?? It >> >>>> also showed some rust down "in the" the mill scale.?? I probably
could have stopped there, but I got carried away with myself.?? This >> >>>> stuff welds really nice if you have bright shiny metal and takes a
good paint coat as well with an etching primer, and proper cure

times.

I probably I could have just used extend or some other rust
neutralizing primer after knocking off the loose rust, but this
construct will be going into a humid environment.

I noticed a fresh flap disc stripped rust, and mill scale amazingly
fast.?? It did more work with less effort in the first minute or two >> >>>> than it did in the next ten.?? Now the flap disc was still nearly
new, but it was performing like one that was half worn away.?? There >> >>>> was still plenty of grit, but the edge was mostly the flaps rather
than the grit, and the face was the same, but also gummed up with
mill scale.

I am NOT trying to get longer life out of a flap disc.?? I am trying >> >>>> to get more time performing like the first minute or two of a new
disc. I don't care if the total life of the disc is less. Is there a >> >>>> practical way to dress these so that you can expose more grit
quickly.?? I tried spinning it against a wire wheel on a bench
grinder.?? The result was less than amazing.

Sans the solution I am looking for is there a better disc for
stripping metal than an abbrasive flap disc??? I can do the work with >> >>>> a grinding wheel, but its much more skilled to avoid gouging the
base metal and doing damage.?? I tend to only use a grinding wheel to >> >>>> make the bevels before welding.

I know what you're experiencing with flap discs and have used this
type of disc to good effect
https://www.weldequip.com/cleaning-fleece-115mm.htm . I've seen many
of this type for sale on ebay and most don't have a high enough speed >> >>> rating for use on a 4.5" grinder so check what you get if you try one. >> >>>

I looked at that.?? I've seen those type of wheels before.?? How well
does it work on mill scale.

In my experience they deal with the mill scale on box section I've
cleaned up very well.

They are a little pricey, but I think I'm going to give them a try?? If
the actually work ok it may be worth it in time saved.?? If not then I'll
know.?? I'll start with one for now and if they work ok, I'll probably
buy a box of them from one of my industrial suppliers the next time I am
flush.?? I'll keep you guys posted on whether or not I think they are
enough better to be worth it.

I still have a few pieces to cut and strip for the current project, but before I bought anything I decided to fall back on the old standby. See
what the Doctorate's of YouTube University have to say. I was not
impressed. Stripper discs were among the popular solutions, but nearly
every one seemed to be plugging up when they actually showed them. Many seemed to be to promote one brand over another brand, and the "better
brand seemed to already be partially plugging up when they would show
how much better it was than the old one they were using. Well duh! The
old one had been used more.

The one that sort of got my attention was an obvious SHILL for a diamond encrusted wire wheel. The thing is when I looked at what they showed it looked to me more like they had the mill scale shiny than removed it.
This was WELD.COM. They shill products all the time, but generally they
give good information. This time the results I saw didn't seem to match
the words they were saying. Needless to say I won't be trying that
diamond encrusted wire wheel unless they send me one for free. Prior to
that they showed a Silicone Carbide flap disc that appeared to do a very
good job with relatively low pressure. The claim was that it "picks" at
the scale as opposed to being an "impact" abrasive. That may be a distinction without a difference, but the result I could clearly see on
the piece of flat plate they were cleaning was the best of everything
they showed. That could have just been fresh disc performance. ie:
First minutes.

The only thing from all across YouTube university's "expert" pool
(except weld.com) was acid. The default "cheap" acid being white
vinegar. Not much help if you need to strip some long pieces, but not
often enough to setup a pickling trough for the job.

A few who really bragged up a product seemed to actually struggle to
just barely clean a very narrow strip along the ends prior to welding.
One then went on to weld his project and atleast one bead of every
corner overlapping the ends of square tube (not mitered) appeared to
just be burning through uncleaned mill scale. Yes I know S6 does an ok
job of burning through mill scale, but that wasn't why I watched his
video.

Sigh!

This guy posted a 406 word reply to himself.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Cydrome Leader <presence@MUNGEpanix.com> writes:

... ...

This guy posted a 406 word reply to himself.

I have to be careful to avoid wordy comments too :-)

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 5/17/2022 3:55 PM, Cydrome Leader wrote:

Bob La Londe <none@none.com99> wrote:

On 5/14/2022 9:45 AM, Bob La Londe wrote:

On 5/11/2022 11:05 AM, David Billington wrote:
> On 11/05/2022 18:59, Bob La Londe wrote:
>> On 5/11/2022 9:20 AM, David Billington wrote:
>>> On 11/05/2022 16:41, Bob La Londe wrote:
>>>> Yesterday I found myself cleaning up a bit of square tube in
>>>> preparation for welding and later paint.?? It was outside, but in SW >>> >>>> Arizona, that just means it has developed a small amount of
>>>> protective rust over the mill scale.
>>>>
>>>> I started with an angle grinder and a flap disc.?? It made short work
>>>> of the light loose rust, but would hardly touch the mill scale.?? It >>> >>>> also showed some rust down "in the" the mill scale.?? I probably
>>>> could have stopped there, but I got carried away with myself.?? This >>> >>>> stuff welds really nice if you have bright shiny metal and takes a >>> >>>> good paint coat as well with an etching primer, and proper cure
times.
>>>>
>>>> I probably I could have just used extend or some other rust
>>>> neutralizing primer after knocking off the loose rust, but this
>>>> construct will be going into a humid environment.
>>>>
>>>> I noticed a fresh flap disc stripped rust, and mill scale amazingly >>> >>>> fast.?? It did more work with less effort in the first minute or two >>> >>>> than it did in the next ten.?? Now the flap disc was still nearly >>> >>>> new, but it was performing like one that was half worn away.?? There >>> >>>> was still plenty of grit, but the edge was mostly the flaps rather >>> >>>> than the grit, and the face was the same, but also gummed up with >>> >>>> mill scale.
>>>>
>>>> I am NOT trying to get longer life out of a flap disc.?? I am trying >>> >>>> to get more time performing like the first minute or two of a new >>> >>>> disc. I don't care if the total life of the disc is less. Is there a >>> >>>> practical way to dress these so that you can expose more grit
>>>> quickly.?? I tried spinning it against a wire wheel on a bench
>>>> grinder.?? The result was less than amazing.
>>>>
>>>> Sans the solution I am looking for is there a better disc for
>>>> stripping metal than an abbrasive flap disc??? I can do the work with
>>>> a grinding wheel, but its much more skilled to avoid gouging the
>>>> base metal and doing damage.?? I tend to only use a grinding wheel to
>>>> make the bevels before welding.
>>>>
>>> I know what you're experiencing with flap discs and have used this >>> >>> type of disc to good effect
>>> https://www.weldequip.com/cleaning-fleece-115mm.htm . I've seen many >>> >>> of this type for sale on ebay and most don't have a high enough speed >>> >>> rating for use on a 4.5" grinder so check what you get if you try one.
>>>
>>
>> I looked at that.?? I've seen those type of wheels before.?? How well >>> >> does it work on mill scale.
>>
> In my experience they deal with the mill scale on box section I've
> cleaned up very well.
>

They are a little pricey, but I think I'm going to give them a try?? If
the actually work ok it may be worth it in time saved.?? If not then I'll >>> know.?? I'll start with one for now and if they work ok, I'll probably
buy a box of them from one of my industrial suppliers the next time I am >>> flush.?? I'll keep you guys posted on whether or not I think they are
enough better to be worth it.

I still have a few pieces to cut and strip for the current project, but
before I bought anything I decided to fall back on the old standby. See
what the Doctorate's of YouTube University have to say. I was not
impressed. Stripper discs were among the popular solutions, but nearly
every one seemed to be plugging up when they actually showed them. Many
seemed to be to promote one brand over another brand, and the "better
brand seemed to already be partially plugging up when they would show
how much better it was than the old one they were using. Well duh! The
old one had been used more.

The one that sort of got my attention was an obvious SHILL for a diamond
encrusted wire wheel. The thing is when I looked at what they showed it
looked to me more like they had the mill scale shiny than removed it.
This was WELD.COM. They shill products all the time, but generally they
give good information. This time the results I saw didn't seem to match
the words they were saying. Needless to say I won't be trying that
diamond encrusted wire wheel unless they send me one for free. Prior to
that they showed a Silicone Carbide flap disc that appeared to do a very
good job with relatively low pressure. The claim was that it "picks" at
the scale as opposed to being an "impact" abrasive. That may be a
distinction without a difference, but the result I could clearly see on
the piece of flat plate they were cleaning was the best of everything
they showed. That could have just been fresh disc performance. ie:
First minutes.

The only thing from all across YouTube university's "expert" pool
(except weld.com) was acid. The default "cheap" acid being white
vinegar. Not much help if you need to strip some long pieces, but not
often enough to setup a pickling trough for the job.

A few who really bragged up a product seemed to actually struggle to
just barely clean a very narrow strip along the ends prior to welding.
One then went on to weld his project and atleast one bead of every
corner overlapping the ends of square tube (not mitered) appeared to
just be burning through uncleaned mill scale. Yes I know S6 does an ok
job of burning through mill scale, but that wasn't why I watched his
video.

Sigh!

This guy posted a 406 word reply to himself.

No, I shared information with people in general. Its not my fault you
find it so difficult to read with your severe case of rectal cranial
inversion.

--
This email has been checked for viruses by AVG.
https://www.avg.com

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"Bob La Londe" wrote in message news:t63ooq$sho$1@dont-email.me...

No, I shared information with people in general.

--------------
Thank you, intelligent user reviews are greatly appreciated.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"Jim Wilkins" <muratlanne@gmail.com> writes:

"Bob La Londe" wrote in message news:t63ooq$sho$1@dont-email.me...

No, I shared information with people in general.

--------------
Thank you, intelligent user reviews are greatly appreciated.

A big follow-on comment from the OP (original poster) can come from
originally asking an open-ended question.

Invite responses which guide you to solutions nothing like what you
have been doing already.

A good communicator starts with very open-ended questions, seeking
very original inputs. A very honest person, very willing to see the limitations of what they have tried already, and assuming they are
likely to be in the presence of others with great knowledge and deep
valuable experience.

If you "seive" like this and get nothing, you might come back with a lower-level question, saying "I have got these things to partially
work" and giving detail of the limitations which caused asking the
questions.
Asked first, that would likely condition the nature of the responses.
You'd get responses to that particular approach, possibly missing my
better totally different ways of doing the same task.

What you could be seeing is, at the end of the asking process, someone
spending some time sharing what they find themselves so far.
A moral duty to share, having asked others if they will share.

Maybe... :-)

Rich Smith

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"Richard Smith" wrote in message news:lyv8tz39pr.fsf@richards-air-2.home...

"Jim Wilkins" <muratlanne@gmail.com> writes:

"Bob La Londe" wrote in message news:t63ooq$sho$1@dont-email.me...

No, I shared information with people in general.

--------------
Thank you, intelligent user reviews are greatly appreciated.

A big follow-on comment from the OP (original poster) can come from
originally asking an open-ended question.

Invite responses which guide you to solutions nothing like what you
have been doing already.

A good communicator starts with very open-ended questions, seeking
very original inputs. A very honest person, very willing to see the limitations of what they have tried already, and assuming they are
likely to be in the presence of others with great knowledge and deep
valuable experience.

If you "seive" like this and get nothing, you might come back with a lower-level question, saying "I have got these things to partially
work" and giving detail of the limitations which caused asking the
questions.
Asked first, that would likely condition the nature of the responses.
You'd get responses to that particular approach, possibly missing my
better totally different ways of doing the same task.

What you could be seeing is, at the end of the asking process, someone
spending some time sharing what they find themselves so far.
A moral duty to share, having asked others if they will share.

Maybe... :-)

Rich Smith

------------------

This TV script writer offers advice on how to tactfully suggest changes to other peoples' ideas.
https://janeespenson.com/

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

...

This TV script writer offers advice on how to tactfully suggest
changes to other peoples' ideas.
https://janeespenson.com/

Interesting.
Very clear.
Very high signal-to-noise ratio.
What she means really comes over.

I am intrigued how you manage to tap into so many of these
generally-shared core-experience issues which are well expressed,
unexpected and very interesting.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"Richard Smith" wrote in message news:lybkvql2o1.fsf@richards-air-2.home...

...

This TV script writer offers advice on how to tactfully suggest
changes to other peoples' ideas.
https://janeespenson.com/

Interesting.
Very clear.
Very high signal-to-noise ratio.
What she means really comes over.

I am intrigued how you manage to tap into so many of these
generally-shared core-experience issues which are well expressed,
unexpected and very interesting.

--------------------

In addition to technical work associates and hobby machinists/tinkerers
(here) my social contacts included community theatre and Mensa, all of which attract well-educated people with wide ranges of interest, polymaths. That article on the Two Cultures correctly describes the breadth of American intellectual life.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 5/22/2022 4:11 AM, Jim Wilkins wrote:

"Richard Smith"  wrote in message
news:lybkvql2o1.fsf@richards-air-2.home...

...

This TV script writer offers advice on how to tactfully suggest
changes to other peoples' ideas.
https://janeespenson.com/

Interesting.
Very clear.
Very high signal-to-noise ratio.
What she means really comes over.

I am intrigued how you manage to tap into so many of these
generally-shared core-experience issues which are well expressed,
unexpected and very interesting.

--------------------

In addition to technical work associates and hobby machinists/tinkerers (here) my social contacts included community theatre and Mensa, all of
which attract well-educated people with wide ranges of interest,
polymaths. That article on the Two Cultures correctly describes the
breadth of American intellectual life.

My wife is on the board of a theater group, and for the most part the
senior members of the board seem intelligent and capable as you
describe, but sometimes practically challenged. For example they
resisted hiring a grant writer for years who was willing to work on a percentage. No salary. Somebody who is very experienced as a grant
writer and does it as their day job. They would research find and apply
for grants with no effort by the board. I don't recall the commission
rate they wanted, but it was quite small. Instead the board opted over
and over again to keep 100% of nothing.


--
This email has been checked for viruses by AVG.
https://www.avg.com

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"Bob La Londe" wrote in message news:t6dtc5$1i7o$1@gioia.aioe.org...

My wife is on the board of a theater group, and for the most part the
senior members of the board seem intelligent and capable as you
describe, but sometimes practically challenged. For example they
resisted hiring a grant writer for years who was willing to work on a percentage. No salary. Somebody who is very experienced as a grant
writer and does it as their day job. They would research find and apply
for grants with no effort by the board. I don't recall the commission
rate they wanted, but it was quite small. Instead the board opted over
and over again to keep 100% of nothing.

-------------

Yes it's good training for getting along with people who are 'different'
from (rational) techie types, and useful when I became an Army sergeant.

The movies of "42nd Street" and "A Chorus Line" demonstrate the good cop/bad cop approach to herding those cats (dancers) into line. Not "Cats", they're dancers but in an entirely different sack of weirdness. After building the
set I sat in rehearsals to look for things I should change, and watched how
a director coaxes repeated maximum effort from actors tiring from a 12+ hour day.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 5/14/2022 9:45 AM, Bob La Londe wrote:

On 5/11/2022 11:05 AM, David Billington wrote:

On 11/05/2022 18:59, Bob La Londe wrote:

On 5/11/2022 9:20 AM, David Billington wrote:

On 11/05/2022 16:41, Bob La Londe wrote:

Yesterday I found myself cleaning up a bit of square tube in
preparation for welding and later paint.  It was outside, but in SW
Arizona, that just means it has developed a small amount of
protective rust over the mill scale.

I started with an angle grinder and a flap disc.  It made short work
of the light loose rust, but would hardly touch the mill scale.  It
also showed some rust down "in the" the mill scale.  I probably
could have stopped there, but I got carried away with myself.  This
stuff welds really nice if you have bright shiny metal and takes a
good paint coat as well with an etching primer, and proper cure

times.

I probably I could have just used extend or some other rust
neutralizing primer after knocking off the loose rust, but this
construct will be going into a humid environment.

I noticed a fresh flap disc stripped rust, and mill scale amazingly
fast.  It did more work with less effort in the first minute or two
than it did in the next ten.  Now the flap disc was still nearly
new, but it was performing like one that was half worn away.  There
was still plenty of grit, but the edge was mostly the flaps rather
than the grit, and the face was the same, but also gummed up with
mill scale.

I am NOT trying to get longer life out of a flap disc.  I am trying
to get more time performing like the first minute or two of a new
disc. I don't care if the total life of the disc is less. Is there a
practical way to dress these so that you can expose more grit
quickly.  I tried spinning it against a wire wheel on a bench
grinder.  The result was less than amazing.

Sans the solution I am looking for is there a better disc for
stripping metal than an abbrasive flap disc?  I can do the work with
a grinding wheel, but its much more skilled to avoid gouging the
base metal and doing damage.  I tend to only use a grinding wheel to
make the bevels before welding.

I know what you're experiencing with flap discs and have used this
type of disc to good effect
https://www.weldequip.com/cleaning-fleece-115mm.htm . I've seen many
of this type for sale on ebay and most don't have a high enough speed
rating for use on a 4.5" grinder so check what you get if you try one.

I looked at that.  I've seen those type of wheels before.  How well
does it work on mill scale.

In my experience they deal with the mill scale on box section I've
cleaned up very well.

They are a little pricey, but I think I'm going to give them a try  If
the actually work ok it may be worth it in time saved.  If not then I'll know.  I'll start with one for now and if they work ok, I'll probably
buy a box of them from one of my industrial suppliers the next time I am flush.  I'll keep you guys posted on whether or not I think they are
enough better to be worth it.

I have been very busy and the project I need to strip metal for has been resting on the welding table in pieces. Not so sure I need a welding
table, but it seemed like a good idea when I built it.

Anyway, I stopped by my favorite local welding shop yesterday (used to
be Praxair, but now its Linde) to see what they thought was good. The
manager I like was still there and he said nothing has changed but the
name, so that's a good thing. Anyway, Mike said most guys like the
ceramic (silicone carbide) of what he sells, but the guys who do all the
tank and line maintenance at the cooling plants like the Norton paint
stripper discs. I bought a couple silicone carbide flap discs and a
stripper disc. I'll do a side by side (well one after another) test as
soon as I have some time to get back to that project. Hopefully by this weekend. I think I still have one fresh Zirconia flap disc left as
well. If I do I'll use it as a base line.

I'll let you guys know what I think. The stripper disc was about 4
times the price of the silicone carbide discs. If it lasts 4 times as
long it will be worth it if only to save the time swapping discs.
Interestingly the silicone carbide discs come with threaded spin on
plastic hubs, but they were not any cheaper than those with similar
metal hubs.



--
This email has been checked for viruses by AVG.
https://www.avg.com

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 5/14/2022 9:45 AM, Bob La Londe wrote:

On 5/11/2022 11:05 AM, David Billington wrote:

On 11/05/2022 18:59, Bob La Londe wrote:

On 5/11/2022 9:20 AM, David Billington wrote:

On 11/05/2022 16:41, Bob La Londe wrote:

Yesterday I found myself cleaning up a bit of square tube in
preparation for welding and later paint.  It was outside, but in SW
Arizona, that just means it has developed a small amount of
protective rust over the mill scale.

I started with an angle grinder and a flap disc.  It made short work
of the light loose rust, but would hardly touch the mill scale.  It
also showed some rust down "in the" the mill scale.  I probably
could have stopped there, but I got carried away with myself.  This
stuff welds really nice if you have bright shiny metal and takes a
good paint coat as well with an etching primer, and proper cure

times.

I probably I could have just used extend or some other rust
neutralizing primer after knocking off the loose rust, but this
construct will be going into a humid environment.

I noticed a fresh flap disc stripped rust, and mill scale amazingly
fast.  It did more work with less effort in the first minute or two
than it did in the next ten.  Now the flap disc was still nearly
new, but it was performing like one that was half worn away.  There
was still plenty of grit, but the edge was mostly the flaps rather
than the grit, and the face was the same, but also gummed up with
mill scale.

I am NOT trying to get longer life out of a flap disc.  I am trying
to get more time performing like the first minute or two of a new
disc. I don't care if the total life of the disc is less. Is there a
practical way to dress these so that you can expose more grit
quickly.  I tried spinning it against a wire wheel on a bench
grinder.  The result was less than amazing.

Sans the solution I am looking for is there a better disc for
stripping metal than an abbrasive flap disc?  I can do the work with
a grinding wheel, but its much more skilled to avoid gouging the
base metal and doing damage.  I tend to only use a grinding wheel to
make the bevels before welding.

I know what you're experiencing with flap discs and have used this
type of disc to good effect
https://www.weldequip.com/cleaning-fleece-115mm.htm . I've seen many
of this type for sale on ebay and most don't have a high enough speed
rating for use on a 4.5" grinder so check what you get if you try one.

I looked at that.  I've seen those type of wheels before.  How well
does it work on mill scale.

In my experience they deal with the mill scale on box section I've
cleaned up very well.

They are a little pricey, but I think I'm going to give them a try  If
the actually work ok it may be worth it in time saved.  If not then I'll know.  I'll start with one for now and if they work ok, I'll probably
buy a box of them from one of my industrial suppliers the next time I am flush.  I'll keep you guys posted on whether or not I think they are
enough better to be worth it.

I still haven't gotten back to my welding project, but this morning
while having my morning coffee and making myself some breakfast I noted Fireball Tools had decided to do a "best" mill scale remover video using
all the same things I've looked at. He skipped a couple I want to try,
but I'm not posting about "which one was best"... or maybe I am. Like
another welding channel he claimed the diamond encrusted wire wheel was
the best, and like that other welding channel what I could see of the
work it did looked more like it polished the mill scale instead of
cutting through it and removing it. The one big positive is he let us
know what that thing costs. Almost $400. Yes four hundred dollars (a
little under, but with shipping etc). That's crazy if I got that right.






--
This email has been checked for viruses by AVG.
https://www.avg.com

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)