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Myford bearing taper

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Lathe Bearings

Lathe Bearings

In The Model Engineer, issue 2427 of November 27 1947, E.H. Doughty, then Chief Technical Engineer of British Timken Ltd. wrote a lengthy technical letter to refute and address some of the adverse comment that had been made about roller bearings.

Chris Trice24/08/2014 00:30:34
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1376 forum posts
10 photos
I tackled the Myford conversion today. The bearings that were supposed to be 15mm wide were in fact 16.25mm wide (identical to the quoted SKF bearings) so the conversion followed the exact same route as the magazine article. You can definitely feel a more positive point between there being play and no play when adjusting the bearings and as a result you can control the clearance of the spindle at the bronze bush end far more precisely. You can also sense that when pressure is applied via the tailstock revolving centre, things are more solid yet still free wheeling.
Michael Gilligan24/08/2014 08:07:19
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23121 forum posts
1360 photos

Sounds like a great success, Chris.

Although it is very sad to see that a bearing supplier can be so far out when specifying dimensions!

... out of interest, do you have the code for the bearings you received?

MichaelG.

Brian Wood24/08/2014 09:38:26
2742 forum posts
39 photos

Hello Chris,

That mirrors my experience complelely, and the adjustment holds much better over time.

I said you would be pleased with the outcome.

Regards

Brian

Brian Wood24/08/2014 11:09:46
2742 forum posts
39 photos

Neil,

Going back to your original question that started this thread, Ken Willson's article in MEW 175 has a most helpful plan view picture of the lathe spindle, from which it is possible to measure the cone angle well enough.

I found 12 degrees using a protractor, so Tubal Cain's drawing in the handbook should read 12 degrees and 25 minutes.

Regards

Brian

Edited By Brian Wood on 24/08/2014 11:10:36

Chris Trice24/08/2014 12:21:18
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1376 forum posts
10 photos

Taper Bearings for Myford conversion. SKF http://simplybearings.co.uk/shop/p14781/SKF+30205J2Q+Metric+Single+Row+Taper+Roller+Bearing+25x52x16.25mm/product_info.html

Chris Trice24/08/2014 12:24:46
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1376 forum posts
10 photos

And these were the ones I also ordered claiming 15mm width but were identical to the SKF item in dimensions. http://simplybearings.co.uk/shop/p43728/30205JR/30205J+KOYO+Narrow+Section+Steering+Head+Set+Taper+Roller+Bearing+25x52x15mm/product_info.html

Michael Gilligan24/08/2014 12:25:42
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23121 forum posts
1360 photos

Thanks, Chris

... useful reference

MichaelG.

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