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Faceplate workholding.

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Nigel McBurney 110/09/2020 09:40:26
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I think an improvement on Jasons soft headstock centre is that I have found that with cutting pressure and tailstock pressure ,the temporary centre can slowly retreat towards the head stock,despite having a newish chucks in good condition. so I reduce the diameter of the bar on the the end that goes into the chuck so that there is shoulder to stop the centre sliding in the chuck jaws. then as a further improvement I get a circular steel blank around 4 to 5 inches diameter ,drill a central hole to suit the larger diameter of the centre and weld it to the centre,positioned about 1/2 inch away from the chuck jaws so that the weld is clear of the shoulder, then drill a hole towards the o/d of the blank,to take a bolt and two nuts which then makes a driving dog for the lathe carrier to drive the work piece.By only skimming a small amount from the centre point each time it is set up ,it takes ages before the cebtre becomes too short,Advantages -a dead true centre every time,and its a lot quicker than removing an 8 inch chuck ,fitting the usual hard centre and then refitting the chuck,I use this arrangement on a Colchester, on a smaller lathe the drive disc could be a press fit or loc tighted if no welding facilties are available,

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