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Re: Tail stock alignment on Seig lathes

 

It is straightforward to modify the tailstock so it is easier to align plus it remains as set.
See:

LMS has plans for a similar scheme.

One difficulty with pinning is that the tailstock needs some TLC to get it to lock into the same position each time. My machine needs some side force applied to the tailstock or it can vary a couple thou each time it is locked down. This was more random prior to removing ridges in the tailstock V.

Also, the headstock alignment to the ways should be verified/corrected prior to aligning the tailstock - not something you can take for granted on the 7x12. One method is described here:


Note that the tailstock is typically a couple thou high and one method for correcting this is to shim the headstock up to match while aligning it to the ways. Further, the ram may not travel parallel to the ways as it is extended. Nor is the ram's taper always parallel to the ram travel. Lots of error possibilities with this tailstock implementation.

As a toolmaker you may have already handled these issues but others following this thread may benefit from this sketchy outline of how the various alignments interact.

John

--- In 7x12minilathe@..., "Dick" <old_toolmaker@...> wrote:

The tail stock adjustment system is poorly designed and I would prefer that I would not be addressing tail stock alignment from time to time. There may be a better method to deal with the poor design and that is what I hope to discover. I have not yet thought through all my options. I am just on a fact finding mission at this point. I am one who thinks things through before making any changes.
Dick

--- In 7x12minilathe@..., Alan Muller <alan@> wrote:

Can you explain what you would gain from pinning
the tailstock castings together?

At 03:46 AM 11/16/2012 +0000, you wrote:


I am thinking of aligning the tail stock on my
lathe using a dial indicator held in the
headstock chuck and sweeping the inside of the
tail stock barrel to get a zero zero reading. I
also would then fasten the two parts of the tail
stock with a pair of dowel pins to lock the
alignment in position. I do not foresee a need
to offset the tail stock in the future because I
have an offset able tail stock center for taper turning.
I think I have all contingencies covered, but
would like to hear from others who might have
done a similar thing. Do you foresee any problems with my solution?
Thanks
Dick
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