Disc Grinder Removing More Material At Edges

[Mancipia Mariae]

Has anyone experienced your disc grinder removing more material at the edges on a flat disc? I'm doing about 30-40% speed. I assume it's a technique issue.

 

[3fifty7]

I don’t have a disc sander and have never used one but I’d imagine it’s due to the larger circumference at the outer edges turning the same rpm as the center giving you a much higher surface per minute moving across the outer area.

 

[Richard338]

Getting on and off the disc and the right pressure while you are removing material all take some care. I have a VFD, so I can hold the piece on the disc without it turning, then use the other hand to ramp up the speed. I still stop frequently to measure the thickness at various points on the piece.

 

[Crag the Brewer]

Getting on and off the disc and the right pressure while you are removing material all take some care. I have a VFD, so I can hold the piece on the disc without it turning, then use the other hand to ramp up the speed. I still stop frequently to measure the thickness at various points on the piece.

Would a foot pedal switch work, or be advantageous?
I'm in the process of building one.

 

[Richard338]

I think in general a foot pedal would be nice. I'm pretty happy how I have it and I'm not sure if it would be compatible with my VFD.

 

[Natlek]

Has anyone experienced your disc grinder removing more material at the edges on a flat disc? I'm doing about 30-40% speed. I assume it's a technique issue.

there is the highest turning speed

 

[FunkCoaster]

In addition to the above... I am assuming you use feathering adhesive to attach a sheet of paper and trim it to fit the disc.
In this scenario, the trimmed edge/perimeter is always (relatively) rough and unpredictable for me. A minor imperfection could cause a torn section to raise up when striking the steel.

I usually take a cheap diamond dressing tool and remove grit from the outer perimeter of the disc. Unfortunately, this also means the perimeter doesn't cut as well. So depending on the use case I may not dress it.

 

[Boatbuilder]

I cut my paper slightly larger than disc. Then roll the paper over onto the cork backing. This really cleans up the plunge area. Wherever you are putting most pressure on blade is where most of the grinding/polishing will happen. I would be lost without my disc grinder. It saves me a lot of hand sanding. I change out the sandpaper a lot. As soon as it stops cutting I change it.