One or two bearing quills

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13 years 3 months ago #4627 by AlaskanSD
AlaskanSD created the topic: One or two bearing quills
Okay... This is what I've gathered from my research.

Single bearing quills were standard until 1984. Poly-V drives came in 1962. You have to have a poly-v drive to use a double bearing quill.

But are all the single bearing quills the same up to 1984?? Could you use a single bearing quill from a 1982 SS in a 1956? And if so, then why wouldn't the double bearings fit?

Thanks for clarifying this. Last night I really disassembled the headstock, got the motor out (shocked that only a few small screws are holding the entire motor on there with all that torque). But I'm currently stumped with removing the other two shafts... The casting up inside the headstock looks pretty rough, but I guess it works!

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13 years 3 months ago #4633 by AlaskanSD
AlaskanSD replied the topic: Re: One or two bearing quills
I should probably take some pictures of the senario, but last night while disassembling the headstock, after removing the quill, I felt the end of the tailshaft (please correct me if I have the terms wrong), or whatever the shaft opposite the quill is called, and it had sharp old hard plastic on it.

Per the diagram below, is there a plastic connector between the two shafts? Is it #57???

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13 years 3 months ago #4635 by AlaskanSD
AlaskanSD replied the topic: Re: One or two bearing quills
I found the old "Supplemental" PDF on SS's site. This document answered alot of questions, but raised a couple more. Below is actually MY headstock.

So I wonder if I"m dealing with #4971

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13 years 3 months ago #4653 by Ron Roberts
Ron Roberts replied the topic: Re: One or two bearing quills
The difference or problem as it were is that the Gilmer drive sleeves and quills have fewer splines than he poly V models. Or is it the other way around? I forget but someone will correct me if I'm wrong on which is which. For sure the problem is the difference in splines.

Anyway in order to use the double bearing quill from SS you'd have to also replace the drive sleeve and the new one will be poly V. If you did that you then need to replace the rest of it.

There are some people who have taken their existing quills to a machine shop to have a second bearing installed. In fact at that point you might as well have them do both ends and install larger bearings than those that come with the SS double bearing quill retrofit.

I have two that have been done that way and when I can find the extra bucks I plan to do the rest of them. The difference was surprising to me but then I had never replaced the single bearing in over 20 years of use. Up until then I believed because I'd heard it from enough people that the single bearing was fine unless you were doing a lot of work, like mortising, that put lateral stress on the quill. I used my original 1983 500 with the single bearing quill for a long time with no problems.

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13 years 3 months ago #4672 by AlaskanSD
AlaskanSD replied the topic: Re: One or two bearing quills
Can you elaborate on this:

"There are some people who have taken their existing quills to a machine shop to have a second bearing installed. In fact at that point you might as well have them do both ends and install larger bearings than those that come with the SS double bearing quill retrofit."


Are you saying that the SS bearings are lacking a bit and there are beefier bearings available aftermarket??


The lady at SS today explained the spline thing. Even though the quills only had single bearings until '84, it changed from 6 splines in 1962 with the introduction of the poly-V drive to 14. So the two bearing quills fit fine into the 1963 and up.

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13 years 3 months ago #4678 by DeanThom
DeanThom replied the topic: Re: One or two bearing quills

Can you elaborate on this:
Are you saying that the SS bearings are lacking a bit and there are beefier bearings available aftermarket??

Kind of, actually, but not exactly.

We all know that in most things in the world, there are different levels of quality. And we all know that most of the time, we can get better quality than that provided as OEM. In MOST cases.

The bearings that SS provides in the quill are within tolerance and within the spec given for expected MTBF (Mean Time Between Failure--or Before Failure, depending on who you're asking). So let's call those the accepted norms, or average. If the SS bearings are a C or C+ bearing, there are others that come in at B or A or A+. Even if the SS bearings are B or B+, there are better. That's what my local bearing guy told me. Said that the ones I showed him weren't bad, but that there were indeed better. I don't know that they are "beefier", but an improvement in quality and increased MTBF.

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