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WM14 Mill spindle issue/adjustment

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Pete.:
Something is screwy here. If I am understanding correctly, the spindle trams correct to the table and winding the head up and down the column dovetail keeps tram but feeding the quill down shifts the spindle axis sideways. The only way you can achieve that error is if the OD of the quill is not turned concentric to the bore.

chipenter:
On my WM15 the bottom of the quill unscrews useing a pin spanner , the top has two left hand locking rings behind the warco badge , then tap on the draw bar and the spindle dropes out .

Pete.:

--- Quote from: Pete. on August 02, 2016, 02:14:27 PM ---Something is screwy here. If I am understanding correctly, the spindle trams correct to the table and winding the head up and down the column dovetail keeps tram but feeding the quill down shifts the spindle axis sideways. The only way you can achieve that error is if the OD of the quill is not turned concentric to the bore.

--- End quote ---

Sorry for quoting myself but I've been thinking about this some more and it can't be a problem with the quill concentricity. For the spindle to remain in tram when the quill ID is non-concentric to the OD, the head casting bore would have to be machined the same amount non-parallel to the mount as the quill bore is non-concentric to the OD. What are the odds of that being true?

RussellT:
I'm with Pete here.  There's something odd.  The odds of two cancelling errors seem small - but perhaps someone has adjusted one out somehow.

Can you attach a dial indicator to the quill and clock it against the column.  That should check whether the quill is moving correctly.  If it's not then loose Y axis gibs or a loose head swivel bolt or muck between the head and head mounting might be a cause.

Russell

picclock:
@Pete
The way I figure it, and it has taken some time for me to work it out. The spindle bearings are good, but the whole spindle assembly is moved vertically by the handle on the side. From the measurements the spindle is not concentric with the part that holds it. I have checked it with a dti against the column before and I think it shows the same error, but I will double check it again today.

Its like the bearing holders of the spindle are not concentric with the part that houses it.

After all this time it will be interesting to see what the problem actually is.

Best Regards

picclock

Edit: added pictures which show ~13thou difference over 50mm quill travel against column.

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