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Thread: Little grinding stones and burrs
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19th April 2014, 07:27 PM #1
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Little grinding stones and burrs
Was at Bunnings the other day and saw these, and figured for $11 I shouldn't expect too much but I tried them anyway,
http://www.bunnings.com.au/stone-gri...90910_p6350039
I also saw these but I figured for $70 they were far to expensive for me (some were as high as $90) - ebay has similar but incredibly cheap compared to Bunnings price
http://www.bunnings.com.au/carbide-b...1225s_p6370301
What do other people use for casual grinding and shaping of
a) Any old scrap steel for odd jobs
b) Fine grinding of tool steel - ie grinding a single point spur gear profile for a fly cutter - am finding it a bit awkward to get the fine control on the bench grinder but it does a great job of cutting the steel
any recommended things on ebay that would be as good as my bench grinding wheel (white Alox) but much smaller - not sure what key words to search for.
Bill
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19th April 2014 07:27 PM # ADSGoogle Adsense Advertisement
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19th April 2014, 08:00 PM #2
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.I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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19th April 2014, 08:38 PM #3
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What to power them with
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
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19th April 2014, 10:31 PM #4
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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
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