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ER32 etc collets

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Ian S C	29/08/2010 12:03:14
7468 forum posts 230 photos	The "yanks" used production line methods to do the Merlin build, machine ground crankshafts instead of hand lapped etc.Ian S C
chris stephens	29/08/2010 15:44:56
1049 forum posts 1 photos	Hi Guys, I think we should ask ourselves why we want to use collets. The advantages are; 1/ Repeatable concentricity, but this is negated, if we machine the whole item at one setting. 2/ Better grip, there is no substitute for a firm grip, especially when using a large, coarse threaded die. 3/ The ability to use ground stock without having to waste material by using the next size up, to get the size we actually want. I shall stop there and let yu'all add to the list. chriStephens
John Olsen	30/08/2010 00:59:09
1294 forum posts 108 photos 1 articles	On point 1/, it is kind of hard to machine the whole thing at one setting when it needs work on both ends. So collets let us maintain a good level of concentricity when we need to reverse the work. Another point, collets are sometimes good for putting centres accurately into work we wish to turn between centres. Another, Collets don't tend to mark the work as much as chucks do. With some types, we have very low overhang of the job from the bearings. regards John
chris stephens	30/08/2010 13:33:39
1049 forum posts 1 photos	Yup, granted. I could have phrased 1/ better, I meant it as follows, 'the advantage of a collet is negated, as even a cra**y three jawed chuck is good enough if you do all machining at one setting'. chriStephens

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