I have mine totally torn down at this point and expected to have to re-align things. There is a procedure for that posted by 'rudydybya' on homemodelenginemachinist.com.
I've pulled the intermediate gears & shaft and 'filled' the holes left by the bearings with a couple of modified 1/2" carriage bolts joined by a coupler. Did sort of the same thing for the hole left by the speed selection lever.
I have a new spindle arriving tomorrow as well as the large table / solid column upgrade. I'm off work the next couple of days (my weekend) so I should get it all back together. I'll need to figure out mounting my scales on the larger table as well. I'm using iGaging scales with a Touch DRO system.
I'll leave the other gears and spacer out. I'm still trying to decide between the stock 6206-2RS spindle bearings or going to angular contact 7206B-2RS. My bearing supplier has both and I'm headed there in the morning. Cost may be the deciding factor in the end although I hate to scrimp at this point.
From: clevinski@comcast.net [GrizHFMinimill]
Sent: Monday, February 15, 2016 8:59 PM
To: GrizHFMinimill@yahoogroups.com
Subject: [GrizHFMinimill] Re: Mini Mill Belt Upgrade / Spindle Bearings
I did a belt drive conversion to my mill, which is a Real Bull, and replaced the bearings at the same time. I left the spindle gear in place originally because I could not get the gear out without separating the "headstock" from the carriage mechanism. I don't know if your mill has the same issue. If so, it will be necessary to separate these two, and then align them after reassembly.
I later had to remove the bearings again (my fault) and decided to remove the gear, so I separated the headstock and carriage. Even though the Real Bull has two large alignment pins, I still had to shim the HS and carriage on reassembly to get them lined up properly again.
Just my experience... your experience may be different.
Good luck!
Charlie
New Jersey, USA
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