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Which flap discs?

Metal cutting - oxyfuel cutting, plasma cutting, machining, grinding, and other preparatory work.

Re: Which flap discs?

Postby The_Fixer » Wed Jul 27, 2016 6:10 am

We use mostly 40 grit flaps on finishing steel. Gives a nice shiny finish in the right hands with the lover's touch, but as they wear down (pretty quickly too, I might add) it is harder to get that smooth finish.

They might not look worn, but they fade off pretty darn quick.

For prep work, we often clean up with a cup wire wheel on a 5" grinder. Bigger jobs require a 9" setup. But if it's actual getting down to clean steel, then it's the flap disk, or grinder depending upon your requirements.

Final finish sometimes we use a 5" Velcro style sanding disk on the grinder. That gives a nice finish, but again, in the right hands.
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Re: Which flap discs?

Postby taylorkh » Wed Jul 27, 2016 8:10 am

Here is the only place I deal with any more

Their clean and strip disks ... -cs4-5-crs will remove mill scale better than anything I have come across. And they do not remove a lot of base metal as a coarse flap disk might.

SAIT cutoff disks DO. I purchased some cutoff disks from Horrible Fright. One cut of a 2 x 2 x 1/8" angle iron and the 4 1/2" disk was about a 3" disk. The disk disappeared faster than the metal.

Checkout Lehigh Valley Abrasives. All of their products are great. You will not be disappointed.


p.s. I have no commercial interest in nor relationship with this company - other than being a long term satisfied customer.
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Re: Which flap discs?

Postby Artie F. Emm » Wed Jul 27, 2016 10:25 am

If it's useful to anyone, I've heard good things about this operation:

...altho I have not bought from them myself.
aka "RTFM"
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Re: Which flap discs?

Postby pscampsr » Wed Jul 27, 2016 11:40 am

I was lucky enough to pickup 25 3M 60 grit flap disks for $50 some time ago on Ebay. They are some of the best I have used. They just seem to keep going. I have used the Walthers and they are great, but very expensive. I really like their cup brushes, like their flap disks they are renewable ( have a steel ring that you remove when they are worn down to renew the edges.)

I have used the Horrible Freight flaps, they don't last very long, but consider the source.

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Re: Which flap discs?

Postby Cbking » Sat Jul 30, 2016 11:34 pm

5" and 7" 3m cubitron 36 grit fiber disks are all we use at work and they rock. Way better than using flap wheels. Image

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Re: Which flap discs?

Postby Cbking » Sat Jul 30, 2016 11:34 pm

5" and 7" 3m cubitron 36 grit fiber disks are all we use at work and they rock. Way better than using flap wheels.


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Re: Which flap discs?

Postby ttreb4 » Mon Aug 01, 2016 10:05 am

LtBadd wrote:
ttreb4 wrote:I use the Walter 40 grit flap discs. I also have some 60, 80, 120 discs. They are great and last a long time. As it gets worn down you just have to take off the orange plastic. This gives the edge back and it continues work great. There are three arrows which allow you to refresh the disc. Once the third arrow is gone and it's worn down there is essentially nothing left on the pad side. There are some great youtube videos which explain how these work to get the most life. I fell I get my monies worth and they are a great value. I bought some from harbor freight but they aren't the same as the Walters and don't last as long. Just my .02.

Is the disc you're talking about one of these?

Yes I use the endure flex. 40 grit for taking heavy rust and grinding. I use 120 for taking off light mill scale without getting into the metal.
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Re: Which flap discs?

Postby jimcolt » Tue Aug 02, 2016 7:37 am

My experience with flap discs is to stick with the best ones......which naturally cost more, however they seem to last much longer and take more abuse.....which means you likely get more grinding, blending, etc. per dollar spent. The two that are superior in my applications are made by Pferd , and the Metabo brand flap discs. When you compare these two they look almost identical......I suspect they may be made in the same place.

Just like with plasma cutters and consumables....the lowest purchase price does not get the lowest operating cost!

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Re: Which flap discs?

Postby Wood Welder » Wed Aug 10, 2016 11:48 am

Many thanks for everyone's input.

I ended up getting a ten-pack of 5" 40g tigerpaw discs for $23. They worked great on a wrought iron job I did last week adding 50 intermediate pickets to a railing to make it kid safe. One disc removed all the paint for welding and still has a lot of life left. I used my variable speed 5" Bosch at a medium speed. The 40 grit worked great as my previous discs were 60g, old, and glazed. Customer was pleased and I made good money.

Pic shows old discs I had been using center and left with new discs right and on grinder. That's my old high speed grinder. A couple of the new discs were out-of-round and worthless.
IronRailing0719.jpg (27.06 KiB) Viewed 575 times
FlapDiscs0716.jpg (22.82 KiB) Viewed 575 times
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Re: Which flap discs?

Postby jroark » Thu Aug 11, 2016 3:45 pm

Just another comment on those Harbor Freight discs, I've bought a couple of those assortment packs now and was pleasantly surprised with how they did. They lasted as long as any other ones I've ever used. And oh so cheap. :D
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