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| John Rudd:
Ok, calling on the collective knowledge of machinists... I can obtain a blank backplate for a lathe chuck. It requires the centre drilling and tapping M40*4 for the lathe spindle and shoulder machining to take a chuck... What is the correct procedure for drilling/tapping/machining? Do I drill out the centre first, then machine the shoulder with the backplate attached to the spindle? How is the backplate initially held when performing the operations required to make it fit? How would you do it? Your advice muchly appreciated |
| kwackers:
Set it up best I can in 4 jaw or faceplate. Face, drill, tap to fit the lathe nose (without removing from chuck or faceplate). Fit to lathe and machine to fit chuck. |
| Davo J:
If you are going to cut the tread on the lathe you can un screw the chuck holding the facplate turn the hole lot around to try it on the spindle without up setting the set up. Then if needed you can remount the chuck and take a bit more off. Dave |
| John Rudd:
Gents, Thanks for the help so far....My first hurdle is to obtain some backplate blanks... :D What should be used as a datum for centring the blank either on a f/plate or 4 jaw? Should I just go for a centre mark in the centre of the boss? I guess there isnt much else to clock from... |
| 75Plus:
John, Not sure what size lathe the back plate is for but broken tread mills are a source for cast iron fly wheels. I bought a 2 hp tread mill motor and it came with a 7 kg flywheel made from fine grained CI. The center hole is a great starting point. Joe |
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