Half Nut Adjustments?

[Wongster]

I took a closer video showing the movements.





There is no available adjustment on the tailstock end of the bearing holding the lead screw. On the rack, there may be some small amount allow to adjust it.

On Jan 2, this year, Proxxon replied to my mail on the proxxon:

Thank you very much for your message. As you describe the problem, we can only think of one possible reason: The toothed rack below the leadscrew is most likely not aligned correctly. This problem can be fixed quite easily:

1. Please open the 4 screws as shown in attached picture
2. Then retighten these screws again step by step from left to right, while pressing the rack to the top. For this, you should press a slotted screwdriver from below in the teeth of the rack und push it upwards.

When the rack is aligned perfectly again (i.e. pressed tight to the top on all 4 screws), the carriage should work smoothly again. You can support this with a drop of light machine oil on the leadscrew and the handwheels.

When I asked about the movement of the lead screw when engaging the half nut, he replied saying that "This is quite normal, a bit of movement of the leadscrews does not affect the turning of the handwheels."

Regards,
Wong