So what is the secret to using a new flap disc for more than 5 minutes? 
I put a brand new 36 grit flap disc on my angle grinder to clean the mill scale off of some angle iron. The disc cut like a house of fire on the first piece of angle, peeling off the mill scale like a hot knife through butter.
Half way through the second piece of angle, I had to lean into the grinder to keep it cutting. The abrasive is gone from roughly 1/4" of the outer ends of the flaps and it just rubs on the backing material. All it does is polish now rather than cut.
So how do you keep these things working, and not waste 2/3 of the disc that still has abrasive trapped below? What do you have to do.... STAND on the grinder?
![[Image: flap-disc1a.jpg]](https://abrasives4sale.com/images/flap-disc1a.jpg)
I put a brand new 36 grit flap disc on my angle grinder to clean the mill scale off of some angle iron. The disc cut like a house of fire on the first piece of angle, peeling off the mill scale like a hot knife through butter.
Half way through the second piece of angle, I had to lean into the grinder to keep it cutting. The abrasive is gone from roughly 1/4" of the outer ends of the flaps and it just rubs on the backing material. All it does is polish now rather than cut.
So how do you keep these things working, and not waste 2/3 of the disc that still has abrasive trapped below? What do you have to do.... STAND on the grinder?
Willie