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| CNC Crash Compilation |
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| Stilldrillin:
Hi Phil. The component parts are heat treated, then drilled for bullet shaped carbide inserts which do the cutting. Also, inserts flush to the outer surfaces, to prevent rubbing wear. Here's a much smaller version, ready for pack/ despatch......... Here's a different type of bit. Inserts fitted. The different colours denote different grades of hole size..... If only I'd taken more pics at the time! :doh: David D |
| philf:
David, Thanks for completing the picture. I suppose the bullet shaped inserts don't wear very quickly like they would if they hard sharp edges. I guess they work by crumbling away the rock by inflicting great pressure on it rather than a normal cutting action. Cheers. Phil. |
| awemawson:
A similar shaped insert is used on 'road planers' that strip tarmac off before resurfacing. Also used on trenching equipment designed for rocky soils. I have bought many tons of road planings, and it's not uncommon to find a cutter insert among the other detritus that gets tossed into the lorry. |
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