Originally Posted by dkwflight
I looked at several schemes for locking the carriage for facing cuts.
None looked very satisfactory.
I find putting the tumbler/ lead screw in neutral and closing the half nuts. The tool pressure pushes the carriage to the right during facing cuts. The compound slide adjusts the tools for facing cuts.
Certainly it is an age old problem but you might get 'compensating tolerances' - if you are lucky. Statistically, I'd rate it along with 'Rocking horse manure'
The old way is to utilise a clamping motion by nipping up the front gib- preferably- until the whole thing becomes solid.
Of course, I'm a heretic. I have pinned gibs and have added at least one additional adjusting gib screw- which is pointed screw rather than a rounded or square one.
Again, I don't add a QCTP to wobble about or a front parting tool.
Laughingly, I was born in a thunderstorm- and have my rear parting tool upside down- at a slant( to avoid loss of height in regrinding) and the upside down kerf- vee'd 140 degrees.
As a very uncouth old geriatric, I looked for the people who actually won cups for their craftsmanship- and - because it seemed a good idea.- copied them
Time to oil my wheelchair?