Trying to gauge what a realistic expectation would be for positional accuracy of my Shapeoko 3 (Standard configuration) should be? I bought my machine to use for making form tooling to thermoform Kydex holster shells as well as to trim the shells after forming, I roughed out a tool yesterday, and came back today to do a finishing pass and was surprised at how much of an offset there was today.
I used the same reference point for my zero and verified the values from the machine origin before running the program. Should cycling the machine on and off cause an offset of .020" in my Y axis and .010" in my X axis? I understand this is not a VMC, and wont have .0001" repeatability, I just want to know how much slop I need to allow myself in order to make sure tooling will be the proper size after machining. I’m hoping that the tool I finished this evening will still work for forming, 1.5" thick HDPE blocks add up quickly in cost. I’m assuming the inaccuracy would be caused by the homing cycle when the machine is cycled on and off, as I have run whole parts in the past and not had this occur.
Any insight is appreciated.