Well, after more than 4 years after delivery and many aborted start - stops, I have determined why the half nut housings fail on JET lathes. Firstly, there is essentially no Q/C. Secondly the half nut leade screw housings do not fit the apron.
typical replacement, I purchased 4":
The problem is the half nuts have to fit the apron cam:
If they do not only one of the bronze nuts will engage, if none.
The apron cam has to fit the leade screw location. So I manually attempted to measure the offset without a jig and my measurements did not repeat themselves to my satisfaction. Finally I constructed a measurement jig.
so above is the JIG, and below it is installed in the apron. The apron was then installed on lathe.
The slot is cut such that I can determine the actual position of the cam lobes. Once this was mounted on lathe, guage blocks and feeler gages gave a high degree of confidence. The gage dimensions were all "square" within +0.001 and -0.001 offset measurements were greatly simplified.
these are just a few:
these are just a few:
from this you can see the simplification of the measurements.
this is where I am to date.
have I received support from JET; yes, however worthless.
Would I purchase another lathe from JET. No. This scenario began in 2011.
have I received support from JET; yes, however worthless.
Would I purchase another lathe from JET. No. This scenario began in 2011.
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