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| spuddevans:
Hi Rickard, I think Ned was referring to the dubious heritage of the far-eastern hardening industry, as that's where many of the 1-2-3 blocks are made. However, that being said, my wallet wouldn't want to risk a 10mm solid carbide cutter on even a dubiously hardened 1-2-3 block :zap: --- Quote from: Rickard on June 16, 2011, 10:43:59 AM ---as we all know British steel has an ....... --- End quote --- It's ironic that British Steel is no longer British, it is now Indian ( I think :scratch: ) "Tata" steel :lol: Tim |
| Bogstandard:
Ned, One of the first things I tried was a tungsten 'hardplate' drill. http://www.leofixings.com/fixings-products_Drill+Bits_Hardplate+TCT+Tipped+Drill+Bits-10-132.html To no avail, all I ended up with was a round tipped drill. So much for bad far eastern hardening. John |
| Corvus corax:
matnewsholme Thanks Matt I'm a member there but up until recently, I actually assumed the threading gear combo charts were to be trusted. I will get those files. Bogs, I'm sorry about your drill man, but I must thank you for that link! Those are good prices on TCT Drills. I've been looking for some at a decent price for a while now. I drill a lot of case hardened parts. |
| DavidA:
At work I have often to extract sample material from some quite hard metals. I use a standard masonary bit with lots of pressure, no coolant (it would contaminate the sample) and a very low speed; about 104 rpm. At around £1.50 each it is worth a try. Dave p.s. Brittan :bugeye: It's Britain; old boy. |
| DavidA:
Bogs, ...BTW, UNC is very close to Whit threads, and in a lot of cases, either mixture will sometimes screw together enough to clamp up and get you going. .. But as Whitworth is 55 degrees and UNC is 60, not really a good idea. Dave. |
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