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| Miner:
Hi Wong, Your right, And I didn't go far enough with my explanation. Your work piece would have a bell type centers drilled in it at each end. And then a ball type center is used at both the headstock and tailstock ends. You then just use a standard lathe dog to provide the drive. Finding a hardened ball for the headstock isn't tough. You'd just buy what are commanly referred to as Tooling Balls. You would want the unthreaded or plain shank ones. Using one at the tailstock end? And especialy as a ball end live center? That's a tough one. And for building something like you are right now? You'd need to design and incorperate the proper bearings in right from the start. None of it's impossible, Just quite difficult to do. Due to the slideing action on the ball as the part rotates. Even a hardened tooling ball will wear over time. So designing a simple system to replace that live ball center would be another high priority. Even that $450.00 Royal offset capable center in 1982 didn't have that set up, Or at least that I know of. I can think of at least one way to do it. But it would take at a minimum a tool post grinder. Pete |
| wongster:
:jaw: this is starting to be beyond my capability at this point. And I was thinking that if I can successfully complete building according to plan, I can start making taper... I saw from some sites that sell live and dead centres some different tips. If I can find one with ball end for head and tailstock, will that work? Regards, Wong. |
| Miner:
Wong, No problem, Yours will work just fine as designed. We just ended up moving towards the "ultimate" tool defination. Maybe a future project for you to keep in mind. I'm not all that sure I could do a proper 100% job on a tool of that type. It might be fun to try though. I do know there's members here that would have no problems making one. Pete |
| wongster:
Thanks Pete. I'm sure we've folks here that have the ability. |
| Xldevil:
Hello. I'm using no ball center with my soc. and my first attempt to make anMT 2 looks good to me.I've adjusted the soc. by the use of a dial indicator and the fomular given here at the bottom of this page: http://www.digitalproducts.de/Kegeldrehen.php You only have to fill out the form and it will show you how much you have to offset your tailstock.It even shows you,if the offset is too much to be safely turned between centers. http://digitalproducts.aklein.org/formeln/Berechnen.html Unfortunately the page is German,but math is international. Nevertheless,a little translation: D wanted biggest taper dia. d wanted smallest taper dia. L given length of taper Lwgiven length of workpiece VR needed offset of the tailstock VR max maximum safe offset of tailstock Cheers,Ralph |
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