Date: Wed, 3 Jun 1998 20:15:05 +0100
From: Andy Dunn
Did read the web page.
Got confused by all the talk of NJ203C3 needle rollers!?!
Was thinking of the Torrington B-1112 off the unit Bonnie.
It drops right in. No grinding of shafts necessary.
(Saw the flange off a stock bush for a thrust washer.)
Action on the bench is very slick.
Will try it in a bike one day if no-one else has.
-
Date: Wed, 03 Jun 1998 20:51:26 -0400
From: Gregg Kricorissian
At 08:15 PM 6/3/98 +0100, Andy Dunn wrote:
>Did read the web page.
>Got confused by all the talk of NJ203C3 needle rollers!?!
Correct ... the NJ 203 is the near side layshaft *roller* bearing, whilst the needle bearing in question is on the off-side.
>Was thinking of the Torrington B-1112 off the unit Bonnie.
>It drops right in. No grinding of shafts necessary.
I've checked the Torrington catalogue for the dimensions of the B-1112, and found it to be much the same as the BH-1016 bearing I'd investigated using, except the 1112 has an 11/16 ID, but a shorter length. The smaller needles of the -1112 bearing give it about 20% lower load rating than the -1016.
Nonetheless, I'd still *really* question the wisdom of running needle rollers on the scrolled journal of the layshaft.
.. Gregg
Date: Thu, 11 Jun 1998 04:02:00 +0000
From: Forrest Whitcher
My gearbox stopped working right the other evening, ..........
Has anyone else seen failures like this?
Forrest Whitcher
Date: Thu, 11 Jun 1998 06:02:00 +0000
From: Jerry Jensen
Yes, one of our club members broke his layshaft in half on a P-11. If
you look at the layshaft, and the mainshaft for that matter, you'll see
that it is machined with sharp right angles. Engineers call these
stress risers which means that loads (stresses) are concentrated at these
locations. High stress means that cracks eventually appear and you know
the rest.
<deletia>
Jerry Jensen USNOA 1326
Date: Thu, 11 Jun 1998 14:25:27 +0000
From: Forrest Whitcher
yup, that's about it, the replacement is better, the broken one had a stress relief ground, (ok it's probably just the oil-runner) but so coarsely it probably caused the problem <grumble>