I have recently started cutting thread on my Unimat 3, using Emco's thread cutting set with change wheels that is still being sold by Emco as an Unimat 4 accessory (see and the screen shot below).?
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External threading goes very well with this set, but when I turned to internal threading, I found that the carriage suffers from a slight play that tilts the carriage slightly off its normal orientation - the carriage's left upper corner (the one facing the motor)? was pushed in the direction of the motor, so I could not ,make a proper thread. I then ascertained to tighten all usual suspects and tried again, but not very successfully.
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So I wondered whether this might be avoided by repositioning the cutting tool.
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Rather then having the point of the tool bit directed to me, could I cut thread by rotating it 180 degrees. That way, the cutting point is in the direction of the motor, thus avoiding the carriage to be pushed out of square since the cutting force would now push the carriage towards me ...
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Just out of curiosity, I wonder whether any of you experienced the same and if so, what can be done to ensure that internal thread cutting goes just as well as external thread cutting? Should I perhaps shim the carriage part that is facing the motor side??
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Many thanks in advance for any input you are willing to share,
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Herman
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Herman de Leeuw