Runout in spindle face plane

This topic has 30 replies, 13 voices, and was last updated 4 September 2017 at 20:54 by Charles Shearer.

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29 August 2017 at 11:28 #314409
Charles Shearer
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@charlesshearer34949
Fear not – I'm not going to do any machining at all.

In an attempt to be totally fair with the supplier I am going to wait for them to respond to me before deciding on any course of action.

I,ve been given (offline) some very generous and comprehensive advice from an unexpected source – I may update further depending on what happens with the supplier.

Tony – I'm about an hour away from Luton.

Charles
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29 August 2017 at 14:31 #314427
Charles Shearer
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@charlesshearer34949
Once again thanks to all who have taken the time and effort to give advice on how to resolve my problems with the WM250V.

I am delighted to say that Roger Warren of Warco responded with an immediate offer to swap-out the lathe i.e deliver / remove / reinstall at an appointed date yet to be advised.

No pain, no negotiation – simply a professional, customer centric response sadly not seen very often in these days of thin profit margins.

Needless to say – I shall have the new DTI / micrometer / test-bars/ precision levels etc etc ready and waiting for the new arrival!!

It certainly pays to deal with an established and respected outfit.

Charles
29 August 2017 at 16:21 #314439
Nige
Participant
@nige81730
Congratulations Charles, excellent response from Warco specially as I am thinking about one of their milling machines. Could be the difference between a Warco WM18 and a Sieg SX3.
29 August 2017 at 16:43 #314443
Howard Lewis
Participant
@howardlewis46836
From what you have said, you have machined a piece of metal, and found it to be tapered.

Climbing aboard one of my hobby horses, this is possible, not because of any fault with the machine, but because of the way that it is mounted. Despite your sturdy bench, it is possible that having the machine bolted firmly to it, this is, in fact, causing one of your problems.

A lathe with a bed that is twisted, although perfect in all other respects, WILL turn a taper.

The way to check / overcome this is either to use a sensitive level; or to use the method advised, by Myford, and repeated in "The Amateur's Workshop" by Ian Bradley.

But solve one problem at a time. Sort out the spindle run out (presumably on the register where the chuck is to locate), and then find and correct any other problems, as they arise.

No three jaw chuck will hold work without a run out. A good example will give 0.005" or less. Bad ones worse, much worse in some cases.

The only way to hold work truly concentric, is to clock it in a four jaw independant chuck. This will give a run out depending upon your patience. (Another skill to master!)

I would not be absolutely confident, even, of a collet chuck, although work machined in a chuck, located in the Morse Taper of the Mandrel should remain concentric, as long as the workpiece is not disturbed in the chuck.

You will plenty of help and advice on how to solve a problem, on this site, (even if sometimes, views are divergent!)

Howard

Edited By Howard Lewis on 29/08/2017 16:44:13
29 August 2017 at 17:10 #314445
JasonB
Moderator
@jasonb
Howard the runout of an unmachined bar gets worse the further out of the chuck it is measured this suggests the chuck is at an angle to the spindle axis. If it were just eccentric running of the chuck the reading would be the same along the length as is to be expected with a 3-jaw

No taper in turned work has been reported.

Think of the fault as being like putting a washer between one of the chuck fixings where it mounts to the backplate.

I would expect parallel work to be quite possible with these faults but when you come to mount thin work against the chuck body or steps in the jaws it won't face off to an equal thickness.

Anyway good that Warco will swap it over, keep us posted of what the replacement is like and your progress on the engine projects.
4 September 2017 at 20:54 #315231
Charles Shearer
Participant
@charlesshearer34949
Replacement lathe arriving tomorrow the 5th September. No 250V available so I've 'upgraded' to the WM280V albeit no DRO this time.

Very much looking forward to having it installed and tested – from the specs it looks like a beefier beast than the 250V.

Spent the lathe-less time watching videos / reading M.E. back issues I bought – hopefully work will start on my Stirling60 this week!
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