Originally Posted by
Andy Fritz
Adjusting the z gib is clearly the issue. BTW:
1 Is the top screw the "A" or the "B" screw?
It would be considered the top screw. Tighteing the top screw/loosening the lower screw tightens the gib, as it travels in the tapered pocket.
Originally Posted by
Andy Fritz
2 When you write that they both have to be tight after adjustment, exatly how tight do you mean? It would seem to me that the actual adjustment is made in the tightness of both A and B as once they are tight and I have the pinch nearly elliminated only a 1/8 additional turn on the top screw tighter will casue more errors.
It's one of those "feel" things. Make sure the gib is loose - the last moves you made should be in the upwards direction. Once you get it adjusted, try using it - don't tighten the screws further. If they end up vibrating loose then readjust and as you suggest, tighten each a tiny bit at a time. Too much will obviously throw everything off...but I found that I needed to become comfortable with the process experimentally - after a while you will sense the feel better. Also it is better too loose than too tight...
But very loose will cause other binding issues...
As I note in my setup articles, it can cause you to go insane. Once it works, leave it alone...I haven't adjusted the z-axis in months now that I have it working right...
Nick Carter
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