Hey guys, I wanted to share my linear bearing install/ upgrade on my grizzly PM 45 clone. I decided to do the linear bearings when I figured out the ways on the z where worn pretty badly. I had been trying to figure out why this mill always had a hard time with chatter. It turned out that the used mill wasn't taken care of too well and there was .020 ware toward the bottom of the ways. The linear bearings are HIWIN HGH25. I bought them from ebay new at a great price, around $200 bucks. So far I machined the z axis saddle and the ball nut mount. I then cut the dove tails just behind the top. I had to remove them to clear the new bearings and still be able to use the scrapped surface to mount the slides to. So far they are nice and smooth. I hope to pick up the z rapids to 100 ipm or more. Before I was only able to get it to 75 ipm.
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