What type of "Grinding Bit" are these??
Every time I want to open up a hole, I reach for my Air Grinder or
Dremil and use a 'stone' grinding bit. But it never seems to do much and wears out quickly. I was recently at a Motorbike exhibition and there was a tool stand, which had a range of 'bits' which were completely metal! They came in all shapes and sizes (balls, cones, cylinders etc) and had various patterns sliced into them. Some had horizontal and vertical slots cut in them, leaving a load of sharp edges, and some had a 'cork-screw' like pattern cut around the outside. Since then I have been looking for 'bits' like this and can't find them anywhere. None of my tool catalogues show anything remotely similar. Does anyone know what these tools are called? Are they designed for 'grinding' in general, or did I misunderstand their use? Any info would be appreciated Jon |
What type of "Grinding Bit" are these??
wrote in message
oups.com... Every time I want to open up a hole, I reach for my Air Grinder or Dremil and use a 'stone' grinding bit. But it never seems to do much and wears out quickly. I was recently at a Motorbike exhibition and there was a tool stand, which had a range of 'bits' which were completely metal! They came in all shapes and sizes (balls, cones, cylinders etc) and had various patterns sliced into them. Some had horizontal and vertical slots cut in them, leaving a load of sharp edges, and some had a 'cork-screw' like pattern cut around the outside. Since then I have been looking for 'bits' like this and can't find them anywhere. None of my tool catalogues show anything remotely similar. Does anyone know what these tools are called? Are they designed for 'grinding' in general, or did I misunderstand their use? Any info would be appreciated Jon Try doing a search for "rotary rasp" - no, it's not a side-effect of a civic club meeting - and you might find some. You might also look for diamond bit assortments: they come in both 1/8" and 1/4" shank sizes. |
What type of "Grinding Bit" are these??
http://www.american-carbide.com/Burs/Bur.aspx
carbide burr? Rotary file? google these phrases and you'll get a hatfull of pages. Dave |
What type of "Grinding Bit" are these??
wrote in message ps.com... http://www.american-carbide.com/Burs/Bur.aspx carbide burr? Rotary file? google these phrases and you'll get a hatfull of pages. Dave Also, avoid using any kind of abrasive to open a hole where there isn't one unless you're trepanning. The center of any stone has little to no surface speed so it won't cut efficiently, regardless of the speed it's driven. Grinding wheels, or mounted wheels such as you're discussing, behave soft when driven slowly, so instead of grinding, they slough off, destroying the wheel. Harold |
What type of "Grinding Bit" are these??
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What type of "Grinding Bit" are these??
wrote in message oups.com... Every time I want to open up a hole, I reach for my Air Grinder or Dremil and use a 'stone' grinding bit. But it never seems to do much and wears out quickly. I was recently at a Motorbike exhibition and there was a tool stand, which had a range of 'bits' which were completely metal! They came in all shapes and sizes (balls, cones, cylinders etc) and had various patterns sliced into them. Some had horizontal and vertical slots cut in them, leaving a load of sharp edges, and some had a 'cork-screw' like pattern cut around the outside. Since then I have been looking for 'bits' like this and can't find them anywhere. None of my tool catalogues show anything remotely similar. Does anyone know what these tools are called? Are they designed for 'grinding' in general, or did I misunderstand their use? Any info would be appreciated Jon I think what you saw were tungsten carbide burrs. They do take a good size bite. Even the fine ones leave a rough surface, so it's a good idea to finish with a stone of the surface finish is important. |
What type of "Grinding Bit" are these??
wrote in message oups.com... Every time I want to open up a hole, I reach for my Air Grinder or Dremil and use a 'stone' grinding bit. But it never seems to do much and wears out quickly. I was recently at a Motorbike exhibition and there was a tool stand, which had a range of 'bits' which were completely metal! They came in all shapes and sizes (balls, cones, cylinders etc) and had various patterns sliced into them. Some had horizontal and vertical slots cut in them, leaving a load of sharp edges, and some had a 'cork-screw' like pattern cut around the outside. Since then I have been looking for 'bits' like this and can't find them anywhere. None of my tool catalogues show anything remotely similar. Does anyone know what these tools are called? Are they designed for 'grinding' in general, or did I misunderstand their use? Any info would be appreciated Carbide burrs used for cylinder head porting and general metal removal. I have dozens of them in my head shop and any major engineering tool supplier would be able to sell you some. -- Dave Baker |
What type of "Grinding Bit" are these??
Thats the ones :) I have looked everywhere and never though of using
'burr' and/or 'file'. A huge thanks for your help Jon |
What type of "Grinding Bit" are these??
wrote in message oups.com... Any info would be appreciated As others have said, they're carbide burrs. Please wear your safety glasses while working with these things. I would *strongly* recommend a face shield as well. I use these extensively at work and have had chips removed from my eye three times. My leadhand had one explode about six inches from his face. They removed eleven pieces of carbide from his eye. I find the chips from carbide burrs to be the nastiest chips in the shop. They're *very* sharp and very small. They stick to everything with texture and you'll do well to have a pair of tweezers readily available when doing lots of cutting. I wouldn't recommend trying to wipe them off your arm with your hand once you're done. Use running water. Regards, Robin |
What type of "Grinding Bit" are these??
Robin S. wrote:
.... *strongly* recommend a face shield ... They're *very* sharp and very small. ... What he said!! Check eBay for them. I bought a lot of 10 for about $1 apiece. They are 1/4"diam 3" long, rotary rasp sort of thing. I have broken a couple, but not worn any out. Bob |
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