Originally Posted by
fourperf
acually this morning I was about .001 on the Z
has anyone else seen this much?
To comment on this independent of the probe stuff:
You can get some variation between night and morning if a cold tool has gone into a warm spindle; it goes further up the taper.
You can also get variation if you have chips in there but that is pretty obvious.
And I have found variation depending on whether the taper is nice and clean with just a very light coating of thin oil or whether it is is more or less dripping goo. I have never bothered to check whether the 'goo' squeezes out after a short while so the tool settles down. It probably does because some parts I do have different tools coming to a common Z position and the way our coolant is set up the tapers get a thorough coolant bath every toolchange and the Zs blend perfectly.
An open mind is a virtue...so long as all the common sense has not leaked out.