Thread: Little grinding stones and burrs

You haven't said what you would power them with, but the Sontax units in the first post spec a 15K RPM maximum speed. The 3.2mm shanked units would be intended for Dremel and similar miniature rotary tools, which run up to 30-33K RPM, so there is an issue there particularly for people with older single speed units.

I don't have an air powered die grinder to refer to for speed data, but I suspect they are in or near the same speed range so the 6.5mm shanked units may have the same issue. Powering either with a drill press or hand held drill will generally limit them to sub 3K RPM, and make them very inefficient at removing material.

Generally the smaller stones have quite high wear rates and short lives, with occasional explosive breakup.

Thanks Mal,

Good point, am quite ignorant about the speeds required for these things, guess I should read the labels.

Have got a dremel, a couple of hand drills a metal lathe and a drill press.

Was wondering about the die grinders, small nail guns and compressors on special at Aldis today seemed like very cheap prices.

Anybody get those today ? Sometimes if they dont sell they end up at very cheap prices a few weeks later.

Bill

I bought a set of those about 7-8 years ago and not knowing any better I used them with a cordless drill and of course I was quite disappointed. Put any sort of pressure on them and they would literally disintegrate before your eyes.
In the end I eventually tossed them out and later learned that driving them too slowly was my main problem. I did find one amongst my odds and sods that didn't make it to the rubbish bin and I tried it out with the Dremel at around 10k RPM and it seemed to work OK. IN the meantime I had bought a cheap pie grinder and a few carbide burs. My compressor is not really up to long term use of carbide on a die grinder but in short bursts I can get a lot more done than I can with the stones.

This was one job where I used the carbide burrs.
The piece I'm referring to is the M shaped piece with the 6 allen screws in it - its 3 pieces of steel sandwiched together and is a chainsaw bar nose adapter than enables a roller nose to be used on a (1.5 m long) sprocket nosed bar.
The RHS one is prototype made out of mild steel while the other one is made out of a an old TC tipped WW circular saw blade that had lost a few teeth.
I basically drilled some holes in the corners and then hogged out the shape with a thin kerf cutting wheel on an old table saw.
The I finished it off with the carbide burr in the die grinder and finally a Dremel with a mini sanding drum - a linisher would have been very handy but I didn't have one at the time