The Shop > Tools
All squared away.
Will_D:
Surely there must be a logical approach to all this?
Like:
1. Check the headstock play.
Fit big chuck, Long length of bar sticking out (unsupported)
Clock it in the two axes and see how much play there is Y axis (cross slide feed) and Z axis ( Up and down)
2. Check any end float in headstock (X axis): clock on end of bar, use a lever on the tool post and back of chuck
When these have been measured and corrected then move onto the saddle and lathe bed alignment checks:
This is as detailed in the Myford set up instructions and uses a machinable test bar (unsupported so use alloy) and take some very fine cuts about 10 " apart. Adust sadle and bed supports until both diameters are the same.
3. Next is the tailstock!
DavidA:
VT,
...Assuming the saddle slide is square to the ways...
That's the easiest bit.
Stand your clock on the bed and traverse the cross slide from side to side.
Maybe clamp a good straight edge to the cross slide table first and clock against that.
My own cross slide shows less than a tenth of a thou' over it's five inch of travel. That is my reference for everything else.
Dave.
vtsteam:
Sorry David, I don't get it....from your word description maybe.
Clock on slide maybe, against square on bed.
Will_D:
The saddle has to be square to the bed! It just slides along the reference bedway (either the "v" on the posh lathes or the bed edge (like on ML7s).
What may not be square is the cross slide ways in respect to the bed. This at the moment is not important as we are concentrating on the headstock alignment and making sire there is no twist in the bed.
I have heard that the cross slide is deliberately not set at exactly 90 degrees to the bed! That way when you face a large piece the centre of the work is concave by a tiny amount. Concave is better than convex when facing!
vtsteam:
will, I did say the slide. And it definitely is a concern in new lathe construction, also as I said. And wear can alter the relationship.
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