We have several Mazak QTN250 machines in our shop. One of our older units (2012) has an odd quirk. I need to put a .021" offset on the x axis of any tool cutting on the sub spindle. This is to compensate for an odd miss match between the tool eye and the sub spindle.
I noticed this after an alignment, I get the main spindle cutting with less than .0005" taper in 12", then start working on getting the sub spindle to cut straight and in line with the main spindle. I shoot for .0005" taper in 6" on the sub spindle and less than .001" tir using a coax in the main spindle. Straighten out the turret, set the offsets for the live tooling heads and finally adjust the tool eye offsets to compensate for everything else moving around.
After doing all this, I can touch off a tool on the tool eye and confidently say I am within .001" of my programed diameter on the main spindle, usually better. What is odd and frustrating, I can touch off a tool, and take a cut in the sub spindle, boom .021 oversize? I suspect there is an parameter somewhere for the subsindle x axis offset that needs to be set after the subsindle is moved. I do not know what it is. Has anyone had this issue?
Our newer machines do not have this issue and our Mazak repairman could not figure it out.
I noticed this after an alignment, I get the main spindle cutting with less than .0005" taper in 12", then start working on getting the sub spindle to cut straight and in line with the main spindle. I shoot for .0005" taper in 6" on the sub spindle and less than .001" tir using a coax in the main spindle. Straighten out the turret, set the offsets for the live tooling heads and finally adjust the tool eye offsets to compensate for everything else moving around.
After doing all this, I can touch off a tool on the tool eye and confidently say I am within .001" of my programed diameter on the main spindle, usually better. What is odd and frustrating, I can touch off a tool, and take a cut in the sub spindle, boom .021 oversize? I suspect there is an parameter somewhere for the subsindle x axis offset that needs to be set after the subsindle is moved. I do not know what it is. Has anyone had this issue?
Our newer machines do not have this issue and our Mazak repairman could not figure it out.