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Yes well one makes ones choices and pays ones money I suppose, however I don't think the collet chuck is the necessarily the best solution and certainly in the UK typical ones such as the Bison one are not cheap, but I can see it might be an interim solution. Probably the best solution would be...

Are you sure you mean .005" and not .0005". If you have .005" (5thou) then you need to do something about it as the bearings are badly worn, and would be worthwhile doing something about for much improved accuracy. If concentricity concerns you then sort the bearings out first before testing the...

I should say that I was thinking in terms of collets drawn in by a drawbar, however looking at the the collets chucks such as those by Bison the advantage might not be so clear cut as these chucks do have gearing and the thread to wind in the collet giving an improved MA.;)

It used to be the case that one can order any size of collet within the range from the manufacturer for a specific requirement probably at a premium though. Watchmaker collets are often available in increments of 0.1mm (0.004" approx.)

Yes the only way one can improve on those it is to acquire a higher quality lathe. Many high precision lathes have the spindle bore and taper finish ground in situ so as to eradicate the manufacturing errors. Watch maker and instrument maker lathes are done that way so spindle runout is zero...

The other thing worth pointing out is that collets are less likely to damage the workpiece because they grip more lightly over a greater surface area. Circumferential grip is only achieved when the size of the workpiece closely matches that of the collet. Being from the UK I've not come across...

Well apart from being a professional engineer, it 's from experience in the workshop and in the workshop and conversations with my peers. If you doubt it think of the mechanical advantage a chuck has over a collet!? Initially there is the gearing, and then the scroll which allows the user to...

The other thing to bear in mind is that collets do not have the gripping force of a chuck, and therefore you may be better using soft jaws bored out to suit the job if you need the accuracy.

The problem with collet chucks is that because we are adding an extra piece onto the lathe we are also adding to the tolerance stack, and it is quite lightly such devices will exhibit more runout than the bore of the lathe spindle which have been specifically manufactured to locate collets in...

Hello Abby, I have 3 Pultra lathes, and I can definately say that you should only have one locating piece underneath. The idea is that when you tighten the clamp one keeps the locating strip in contact with the side of the bed, and the underside of the compound slide is in contact with the top...