I found an auto tune parameter. This parameter adjusts the rigidity of the system by changing a group of parameters together. The default setting was 13, I changed it to 7 and eliminated 80% of the rattling sound from spline/hub interface. It is good enough to start milling now.
The JMC manual is not bad, but for someone with no previous servo tuning experience, it is a bit challenging. I could not figure out how to adjust the Proportional gain as noted above. Perhaps they are using a different term for the same. I am going leave this for now, and revisit using tuning software in the future. I am still working on the max rpm issue.
With respect to installing the spindle bearings, here is my approach. My goal was to avoid using the press if possible. Here it is:
- Install the outer race of the bearings into the quill housing using a bearing race kit (https://www.amazon.com/dp/B07DC31TB3?psc=1&ref=ppx_yo2ov_dt_b_product_details). This tool makes easy work of driving the race into place with considerable control.
- Freeze the spindle overnight.
- Heat the inner race/roller cage (also called the cone) of the bearings in the oven to 155. I baked them for an hour. I also wrapped them tightly in tin foil to minimize dust.
I then used a tube (https://www.amazon.com/dp/B0BR91H84R?psc=1&ref=ppx_yo2ov_dt_b_product_details) which fits over spindle and a 3d printed adapter that mates the tube to the inside race of the bearing. I printed one adapter for the top bearing and one for the lower bearing. I also 3d printed a plug to fit into the top of the tube, to allow me to hit the top of the tube squarely with a 2# dead blow hammer. I was then able to tap top of the tube and drive the bottom bearing until I felt it hit the shoulder. I was able to drive it fairly easily since the bearing was heated and the spindle was frozen. I placed the spindle with the bottom bearing installed through the quill and tapped the top bearing just until it almost touched the corresponding inner race. That’s it. Then I tightened the spindle nut just to the point that the endplay was zero. Done! I really like this approach because it gave me complete control over exactly how far I drove each bearing and race. Even better, I get to return this large press that is taking up too much floor space!
Thanks… Richard