Shopsmith Forums

I have a early 80's mod 500 that needs quill bearings. I thought I had a two bearing quill but when I disassembled it I only found a hat shaped washer on the splined end. There are no remnants of a bearing in the motor pan. Does anybody know what aftermarket bearings are available? Any help would be greatly appreciated!

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Thanks for the info Dave. Will take a look.

Hi,

Some of us have gone the route of replacing our quill with the two bearing model from Shopsmith. It will cost a bit more but the specks are better on it... you can of course get the new bearings and keep the one you have as a backup or sell it on ebay.

Ed

Thanks Ed, Can a second bearing be added to the one bearing quill. Just wondering? Also, how much does the #57 plastic drive have to do with run out.
Kenneth

Yes, if you have a machine shop nearby with a metal lathe that has a spindle thru hole diameter greater than 1 3/4". No lathe follower can be used for this machining. I use the same front quill bearing Fafnir 202KDD5 and machine the rear part of the quill housing to accept this bearing (35mm) for a depth of 2". I convert most of my single bearing quills.

The #57 plastic drive and ring assembly is what supports the splined end of the quill shaft. This assembly must support the torque and any side deflections at the quill arbor. Any flex or wear in this assembly could cause runout at the quill shaft arbor position. A second bearing removes this possibility.

falcon62 wrote:Thanks Ed, Can a second bearing be added to the one bearing quill. Just wondering? Also, how much does the #57 plastic drive have to do with run out.
Kenneth

I have seen post about someone who use to do that but I think he retired. If you wait a day or two perhaps someone who has had that done or knows more about it will post.

As far as the plastic drive has to do with it, that would only come into play once the bearings are shot. The quill on my original machine were not in bad shape when I replaced the quill so I boxed it up and have it saved just in case. The quill out of the used machine was in bad shape and I have that in my repair box. I have been thinking about getting a new bearing for it but then I'm not sure I really need it since I already have a spare.

BTW the bearing swap is very easy and you don't have to have any special tools to do it. I've had mine apart and the bearing on and off for pictures at least twice...

Ed

I guess I should have just waited... while I was writing Bill was posting!!!

falcon62 wrote:Thanks Ed, Can a second bearing be added to the one bearing quill. Just wondering? Also, how much does the #57 plastic drive have to do with run out.
Kenneth

Thanks Bill and Ed. That's the kind of info I knew I could find here! Bill, if I understand correctly, the quill housing has to be machined out to accept the OD of the same bearing used on the front. The ID of that bearing will press on the quill shaft same as the front?
Thanks again for the help guys!
Kenneth

Since the single bearing quill shaft was not designed for the the second bearing, I find .001"-.002" differences in the shaft diameter (5/8") where the second bearing inner race rests/fits. Some go on easy and others a little harder. I use RED LocTite on the shaft to insure that the inner race will not turn of spin on the shaft. The machining of the housing for the second bearing must be precision and accurate. I did a dozen quill housings at a time so the machine shop will accept the work and give a good price. I have made use of the previous ones I had machined so may do another dozen in the new year. I do not sell these modified 2 bearing quills separately but only use them in the headstocks I sell because I give a warranty with them. This only applies to Poly-V drive Quills. Skip Campbell (10ER Guru) from Texas did sell a 2 bearing quill for the Gilmer drives.

Since I use one of my Mark Vs as a drill press and milling machine which puts a very high side thrust on the quill, I had a quill housing and shaft machined to accept the same size bearing directly behind the front bearing. This has worked well for me with no problems for many years now. I did a Gilmer drive at the same time too but as it cost twice as much for machining both the housing and shaft, I have not did any more.

Finally Note: I am finding that using the Fafnir 202KDD5 (C1 rated) bearing as the front bearing in the single bearing quills gives me excellant results (run out) as you get from the 2 bearing quill. Again, only my opinion.

falcon62 wrote:Thanks Bill and Ed. That's the kind of info I knew I could find here! Bill, if I understand correctly, the quill housing has to be machined out to accept the OD of the same bearing used on the front. The ID of that bearing will press on the quill shaft same as the front?
Thanks again for the help guys!
Kenneth

Thanks Bill, With your knowledge of these machines, I'll have mine running in no time!
Merry Christmas to all