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Machining Between Centres

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John Olsen	08/01/2011 23:18:02
1294 forum posts 108 photos 1 articles	If the need is for a MT2 centre that has a smaller than normal nose so that it can stick out through the faceplate, I would suggest looking for a MT2 shank with a plain end...these are sold by the usual suppliers. The non taper end is a plain parallel section, and is unhardened. (Don't get a taper one meant for a drill chuck by mistake.) So you can fit it in the taper on the lathe, turn it down to the diameter and length you want, then turn a 60 degree centre on it. You can also mark both it and the spindle so that you alwyas put it in the same way. That gives you the advantage of a nice ground and hardened taper part, saving you a lot of work. It does not matter that the centre is not hardened, since the live centre does not need to be, and it allows you to correct it later if the tip gets spoilt. Last time I used one of these tapers was to cut a screw thread on it to mount a home made boring head, so you can see that the material is quite OK to machine. regards John
ady	09/01/2011 12:38:43
612 forum posts 50 photos	Is the tailstock adjustable on your unit? It's not something which occurred to me, but the intention may be to make it impossible to turn between centres because there's no adjustment. The newer arceuro units do have an adjustable tailstock.

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