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Joined: Apr 2012
Location: Ontario
Try pushing it into a sharp edge like the cut on the end of the angle iron, it might just be plugged up with rust.
I use them all the time to blend welds and general cleaning as your doing, but really heavy rust gets the 24 grit on the 7 inch angle sander.
Free advice is worth exactly what you payed for it.
Greg
Posts: 205
Threads: 27
Joined: Jan 2013
Location: Maryland USA
Best of luck.
I know this much... getting rid of millscale will abuse the hell out of a new disk, take that off with a 1/4'' thick grinding disk then change over to the flapper. They dont last long but when you get down by lets say a quarter run the edge of the disk on a piece of flat steel to grind off the edges and start over, dont buy cheap brands you get what you pay for.
Saying all that they are really great if you dont have to pay for them, i am an ex pipe welder they made my life a breeze on prepping my butt joints and skimming my cap edges..... they allso make different pads for different materials.
Anthony..
ieezitin, proud to be a member of MetalworkingFun Forum since Jan 2013.
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Location: Ontario
Some are red oxide colour and some blue, which is for what?
Free advice is worth exactly what you payed for it.
Greg
Posts: 4,452
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Location: Missouri, USA
These are the discs I have.
Camel Grinding Wheels
My attack angle was approx 5 - 10°.
There was only
light surface rust on one half of 1 piece of angle (out of 3 pieces - 19" long). There is no build up of any kind on the disc.
IIRC, these were $7-$8 each when I bought them so they aren't cheap...
Quote:UPC #: 42301
Name: Z3 Regular Disc
Application: Active grinding agent provides cool cutting with light pressure. Special optimized resin bond offers maximum cutting capacity, strong edge stability and long life.
Description: Premium Zirconia Alumina grain with a poly/cotton heat treated backing. The poly/cotton combination provides low stretch and strength for the high Zirconia concentration that Z3 contains. Fastest grain removal in the marketplace for carbon based steels (26% more than the competition) and second best after CGW Z-Stainless discs on stainless steels, while offering excellent life.
Comments: Contaminate-free. For working on flat grinding surfaces. Most efficient when used between 0°15° angle. The best choice for smooth finishing.
Suitable For: Recommended for aggressive use and heavy duty applications.
Diameter: 4 1/2?
Arbor Hole Size: 7/8?
Thickness: Regular
Grit: 36 (Medium)
Type: 27 Depressed center flat disc
Use: Right angle grinder
Max Operating Speed: 13,300 RPM
Material: Zirconia
Made In: USA
Quantity: 10
Willie
Posts: 24
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Joined: Jul 2014
Location: Devon, UK
(10-13-2015, 04:26 PM)Highpower Wrote: So what is the secret to using a new flap disc for more than 5 minutes? 
LIGHT pressure only.
The abrasive is stuck to a canvas or cloth pad, pressure rips it off.
Flap disc are for finish not rough cut.
Always prep with a grinder disk.
Authority= many hundreds used over many years on Stainless steel, mild steel, hardened steel, wood and plastics.
Works for me.
Trev
Posts: 4,452
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Location: Missouri, USA
Anthony, I don't have the "trimmable" discs - just the regular ones with the fiberglass backing.
Trev, I hear where you are coming from. I guess what I am NOT understanding is why the cloth backing strips don't just wear down and expose more new abrasive that is still sitting between the stacked layers of strips? The strips are 3/4" wide but the disc just stopped working after the 1/4" of strip that was exposed had worn out. So now it just rubs on the bare ends of the strips without cutting. Isn't the idea to have the
entire strip wear away and not just the abrasive?
Willie
Posts: 24
Threads: 1
Joined: Jul 2014
Location: Devon, UK
Highpower I do see your point.
I have never had that problem.
In the next few day I will try to over work a pad and see what I come up with.
The way I have used them I end up ending with next to nothing or one or more of the flaps fall off.
Hope fully we will come up with an answer.
Trev
trevatxtal, proud to be a member of MetalworkingFun Forum since Jul 2014.
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![[Image: flap-disc1a.jpg]](https://abrasives4sale.com/images/flap-disc1a.jpg)
