How do I solve this?

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Fergus OMore:
Frankly, I cannot see why the reference to the vise/vice is relevant. To me, the vice is just an additional problem to solve.

Again, you should check the knee alignments before addressing what the table is up to. OK, I've never 'done' a Centec but you may have to put parallels or round rods over the guides to do the clocking. If these are OK and only if they are, move on to the table checks.

All that I am doing is finding where the possible fault or faults is.

As a sort of daft after thought, are you conducting all this with the Centec levelled up with decent spirit levels?

Anzaniste:
The vice is mentioned because that is where this saga started.
I must be being really thick, I can't see what is meant by "round rods over the guides" Which guides?
The problem seems to me to be that dove tail slide that the knee runs up and down on is not in line with the spindle of the vertical head. I have got it in line in the x axis and now I need to get in line in the y axis where there is no obvious adjustment.

Fergus OMore:
Putting precision rods at the outside of vee ways is pretty standard stuff - it makes it easier to measure as it goes over the top of perhaps worn ways. Again, putting rods in the vee ways is a check of parallelism.

If you think about it, you have no idea whatsover of the wear or distortion that has taken place. Creating some level as a reference becomes vitally important.
For instance, I have a bloody big bow micrometer which will bridge across ways. It look like a heap of ****** but it becomes a bridge comparator. If you follow 'the book' others have humpbacked straight edges to check.

You have to check the machine's geometry in each part.
You might only have to scrape or replace gibs.

What you always have to remember is machine ways have two sides. One side is metal to metal whilst the other will be unworn- but the gib filling the gap is the metal which slides on the fixed part of the machine.

Fergus OMore:
I have a note of some techniques in lathe alignment and restoration which you might find useful.
I had to scrap most of it when the new owners of Model Engineer got tough. Anyway, it is immeiately prior to December 1988 in Model Engineer.

You may find the full articles by the late David Lammas worth reading.

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