'Turning threads on Mazak'

Tom (1) from Hastings, MI (Contact Member) -

We just got our used Mazak QT-15 with T-32 control up and running and are working the bugs out. The latest problem is thread turning. It occasionally makes a great thread, but most of the time, in the midst of threading it gets out of time with the thread and cuts the partially made thread in half. I stopped it after each pass to take a look at what it was doing and this is what I found. 1st pass: good, 2nd: good, 3rd: good, 4th: cut existing thread in half. 5th through 7th: right in line with first 3, 8th took it's own random path again. Any ideas what the problem might be, thanks a lot.

Comment #1 Perry (86.132.199.118) -

Look on top of the spindle (take rear cover off) you will see an encoder and toothed belt. Things that cause your problem are:-

belt too loose

belt dameaged

faulty encoder

This encoder is ONLY used for timing when cutting threads

Hope that helps

Comment #2 Panhead from Cocoa, Florida (Contact Member) -

Stupid question here!! how do you enter the thread pitch on a mazak QT-10 with mazatrol?? There doesnt appear to be a block that asks for the pitch and the manual sucks!! Thank you

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