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How to fix worn pinion bore in apron?

Doan

Plastic
Joined
Aug 10, 2021
Thought I would post a follow up.

My solution was to ream the apron oversize and turn an oversize shaft on the lathe. Reaming the apron. for some reason the picture is upside down.
20210912_105449.jpg

It turns out that the heavy 10 pinion and the 9" pinion are the same(thanks Latheman) except that the 9" version is pinned to the shaft and has a 5/8" bore.
9InchPinion.jpg

Turn the shaft down to the fit the oversize apron. Turn one end of the shaft down to 5/8" creating a step in the shaft. Then press on the pinion gear - it is an interference fit- and cut off the extra.
20210912_190433.jpg 20210912_202609.jpg
 

Doan

Plastic
Joined
Aug 10, 2021
Reached the 5 picture limit...

Locate the gear on the shaft and drill a hole for the pin. Fortunately I had the correct reamer for the taper pin. :)

20210913_180347.jpg 20210913_181037.jpg


The closer fitting pinion meant a shim had to be removed from under the rack, but once this was done there is very little play in the handwheel and the carriage travels smoothly.
 
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