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| How to drive slender shaft when turning parts between centres |
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| mgj:
Pekka- you can get very cheap D1-4 camlock backplates - is that what your machine has? You can afford to drill and tap that with a clear conscience and it won't matter if its a touch looser on the taper/register than a good one - and it will protect the register while you work. But if you go that route you still need a (3 MT?)centre to go in the 4MT adaptor, and if centering is critical it is good idea to use a soft centre and turn a new point on it. Which is where the "keep the chuck on and turn a centre and use a cranked drive dog" merchants came in, because they are achieving all the accuracy of the above for the cost of no more than a drive dog? Had you decided how you intended to turn/apply a cut on this slender shaft without it flexing, or can you use a traveling steady? |
| PekkaNF:
--- Quote from: mgj on June 08, 2011, 06:11:26 PM ---Pekka- you can get very cheap D1-4 camlock backplates - is that what your machine has? You can afford to drill and tap that with a clear conscience and it won't matter if its a touch looser on the taper/register than a good one - and it will protect the register while you work. But if you go that route you still need a (3 MT?)centre to go in the 4MT adaptor, and if centering is critical it is good idea to use a soft centre and turn a new point on it. Which is where the "keep the chuck on and turn a centre and use a cranked drive dog" merchants came in, because they are achieving all the accuracy of the above for the cost of no more than a drive dog? Had you decided how you intended to turn/apply a cut on this slender shaft without it flexing, or can you use a traveling steady? --- End quote --- Hi mgj, I wish I had a camlock chuck...maybe I could afford one if I sold all my lathes away. I have a soft MT4 centre for the lathe, no problem there, but you brought to my attention very important point of protecting the register. I wonder if the coin would have dropped before a clacking sound? Thank you. There are few more intricaties to be sorted out before I rush into finishing them. I might give least one of them a go just to double check that lathe turns true enough on that setup. You never know. Making a dog should be easy, but if I order some stug from my favorite supplier, I probably order one or few. I probably could use keystock, With a clearance hole on driving pin and use low teperature release screw lock to attach this dog to finished section of the work....Or just use some brass shim stock. I really can't believe that I never had to turn between centres before. I rather spent 45 centering the bugger on three jaw chuck that went proper way. Pekka |
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