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Thrust bearing modification to mini lathe compond slide.

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ian_in_the_midlands:
Hello Pete,
I agree with what you say if you were talking about the cross slide, but the compound on mine works in a different way.
If I remove the handle and the collar, the lead screw will pass through the bracket - is yours the same?
There is no recess on my bracket.

I also agree - 1 ball race only works in 1 direction, but luckily this is the direction I was having the problem with.
Fitting a second bearing to work in the other direction would be more difficult because the bracket fixing bolts are in the way. I am sure it can be done, but I have no issues when winding the compound slide in that direction so 1 bearing is all I needed.

Chuck in E. TN:
Ian, I hadn't done it yet as I hadn't found a suitable and affordable bearing. Now that you have found the spec, I see that VXB has them for under $5 US. Will definitely try this mod.
 
Chuck

ian_in_the_midlands:
Hi Chuck,
Are you seeing the same problem as me: The graduated collar sticking and not reliably turning with the handle? Before you order your bearing, it may be worthwhile measuring the diameter of the hole in the collar. I seem to remember reading somewhere that some are 10mm.

Manxmodder:
Hi Ian, can I ask does your graduated collar have any means of adjusting the amount of friction between it and the spindle.

On the Harrison dials there is a grub screw which loads a spring and acts on a small brass disc which creates an adjustable level of friction between the graduated dial and the inner spindle collar.

I have included a link to image showing a similar set up which uses springs and a couple of ball bearings.....OZ.

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http%3A%2F%2Fbbs.homeshopmachinist.net%2Farchive%2Findex.php%2Ft-53703.html&ei=GOezVJ7HBsTrUoKRg5AI&bvm=bv.83339334,d.d24&psig=AFQjCNFLhbwyTR0j4fGcvdh5d1KhGCkh4A&ust=1421162186654916

ian_in_the_midlands:
A bent spring is used to allow the collar to turn, whist applying the tension to hold it in place (item 45).

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