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| Threading Die Holder |
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| Darren:
I've seen it all now http://cgi.ebay.co.uk/4MM-Tungsten-Carbide-Silver-Tone-Wedding-Band-ring-NEW_W0QQitemZ260370128008QQcmdZViewItemQQptZGemstone_Rings?hash=item260370128008&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A2|39%3A1|240%3A1318 |
| rleete:
Cool! If I didn't have one, I think I'd get a set. |
| bogstandard:
http://www.leofixings.com/fixings-products_Drill+Bits_Hardplate+TCT+Tipped+Drill+Bits-10-132.html I don't think that will solve your problem. I think you are most probably drilling too fast and the tip has overheated, and so hardened the bottom of the hole. Try a new drill, slightly smaller, with a hand brace if you have one, and PLENTY OF CUTTING FLUID. Your other problem will be tapping it, with something that easily hardened or hard already, I think you will be onto a bit of a hiding. Sorry to be so negative, but that is how I see it. Please, if you can, prove me wrong. The way maybe to have success is to heat it up to bright cherry red and hold it there for about 5 to 10 mins, then bury the part in DRY sand and let it cool down very slowly over a couple of hours. That just might soften it enough for you to get it finished. John |
| Darren:
Hi John, Yes I'm anticipating that tapping may be the :bang: :bang: :bang: I did drill it at the mill slowest speed as I anticipated problems, Can only try and see what happens, thanks for the link :thumbup: |
| sbwhart:
Hi Darren John just beat me to it with the tapping issue and annealing the job back, great minds. When you want to do a bit of heat treatment is the time you regret getting rid of the old coal fire and installing central heating, radiators just don't get up to cherry red. :lol: As you say you can only try it may be OK but don't be put off having to start again we've all got scrap boxes. Good Luck Stew |
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