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| How to drive slender shaft when turning parts between centres |
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| PekkaNF:
Hello, I hope you guys are not completely sick of my questions. I wish to turn a slender shaft dia 12 to 16 mm between centres (because I have to try fits and remove it from the lathe anyway), some are tad over 100 mm long, longest one is 170 mm. I never turned anything between centres. Read bout it and I can tell soft centre from hard one, but I don't have a faceplate and centre sits fairly deep in the spindle. I'm going to remove 3 jaw chuck. I see faceplate and dog being used on Myfors, but how to do with chinalathe? Is there any obivious way to drive it without a face plate? This lathe has MT4 taper, but no nose thread or register such as Myford has. I have one 3 mm deep register at 95 mm and PCD for bolts is something bit over 100 mm. Is this turning to another turning exercise and tool making before I'll get to make tools. Where is that shiny piece of round 130+ mm cast iron when you need one? I don't think I have anything of that dimension lying on my shop.... Thanks, Pekka |
| mklotz:
Leave the 3jaw in place. Mount a scrap of steel and turn a 60 deg point on it. Voila, instant perfectly centered drive center. Make a clamp for the workpiece and mount a bolt/rod/whatever to the clamp such that it bears on one of the chuck jaws to provide the rotational torque. |
| Jasonb:
As Marv says, just don't remove the centre from the chuck until the job is done and true it up again for the next job. You can also drive with a cranked dog letting the cranked end bear on the side of a chuck jaw. On a far eastern lathe with a 3 stud spindle flange you can lock a bolt into one of the stud holes with a couple of nuts and use that to drive a clamp or dog. Jason |
| krv3000:
hi her is sum pics of my set up fore turning up betwen centers |
| PekkaNF:
Thanks. I'll have to remove 3-jaw chuck. Thanks for the ideas, I have to somehow use the chuck backplate to drive the dog. Thanks for the picture krv3000, something like that. Pekka |
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