declaring offsets on osp300lathe without touch setter, by using a zero setter instead
hello, this thread shows a method for Z&X offsets declarations, on a lathe that is not equiped with a touch setter; osp300
i believe that something similar can be done also on lathes with osp < 300, so to help measuring tools when the touch setter is missing
... i use a zero setter, right on the chuck face ( attached image : " gauge Z " )
... image 1:
...... actual Z offset is 33.501
...... i push CALL + 50, because 50 is the calibration height for the zero setter (*1)
... image 2:
...... actual Z origin : 143.212
... image 3:
...... after CALL + 50, the offset value changed to -109.839
...... i push SET 143.212 - 109.839 (*2)
... image 4 :
...... final offset = 33.373 ( and it is pretty close to the previous value, which was 33.501, as shown in image 1 )
things would be faster if it would be possible to use CALL + 50 ± VSZOZ, instead of CALL + 50; because it is not possible to input VSZOZ inside the edit field, i have to use SET
a way arround this, would be :
... declaring VSZOZ = 0 before starting this procedure, and, like this, only CALL + 50 would be enough to declare the offset; of course, at the end, VSZOZ has to be restored
... or simply input CALL + 50 ± 143.212 ( i guess you will figure it out, if there should be used "+" or "-" )
for X, it may be possible to put the zero setter on the tailstock ( image " gauge X "); i won't present those steps right now, unless someone really needs this; so just ding for more infos !
if you are going to try it, pls check also the notes below / kindly
(*1)
about the calibration height of the zero setter :
... when the dial indicator, of the zero setter, is at zero, there are still 50mm to it's base
... in reality, this calibration height is not exactly 50; depends on zero setter ( i once determined 49.964 )
... for this method, is enough to consider 50, thus i don't mind declaring an offset which is altered by an error of 0.04
... i use the calibration height with increased accuracy only when i do more sensitive stuff, like hunting pigeons
(*2) this lathe is calibrated, and like this, program Z origin ( VSZOZ ) represents the distance between material face and chuck face
on a non-calibrated lathe, the final step would be SET 143.212 - 109.839 + something, where "something" represents the distance between "chuck face" and " program Z zero reference point "; by Z axis calibration ( achieved by messing with encoder origin ) , this "something" becomes zero, thus the " program Z zero reference point " will be on chuck face Z is not the single axis which can be calibrated; ding for more infos !
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