PSN-L Email List Message
Subject: Re: Acouple web images and text of the ball bearings rims support
From: John Popelish jpopelish@........
Date: Sun, 06 Nov 2005 15:11:23 -0500
> In a message dated 06/11/05, jpopelish@........ writes:
>>The upper bearing is made with the other half of the outer race
>>epoxied to a small slice of aluminum U channel so that it completes a
>>loop. The part that holds the ball is slotted with the dimple in the
>>inside of the slot, so it can pull on the ball. The channel slice has
>>a hole for a mounting bolt, opposite the half of the bearing race.
>>The groove is horizontal.
> With one groove horizontal and the other vertical, the ball bearings
> will be seeing surfaces with dramatically different rates of curvature. This is
> very likely to effect the balance setting, the freedom to swing and the
Yes, I agree. Both groves should be horizontal so the balls roll
along the grove, instead of scuffing across it.
>>This hinge makes use of the exquisitely precise, smooth and hard
>>surfaces intended to carry load in the original bearing. I hope to
>>get around to testing the design soon, but life keeps getting in the way.
> I doubt if it will give you the results that you want, for the reasons
> that I have stated, but do try it out and let us know the results! Have a 'do
> it now campaign'?
Easier said than done, but I will let you know the result of this
experiment as soon as it happens.
> You might just 'get away with it' if you used a very much smaller
> diameter balls in the ground outer bearing track and aligned both tracks horizontally?
The balls are about 1/16th inch diameter, now.
> If these are ordinary bearings and not stainless steel, you will need
> to put a drop of light oil on the contact point (clock oil?) and make an
> overlapped paper screen around the joint to prevent the oil from collecting dust.
The balls roll such a small part of a degree for the full +- 1/4 inch
of boom end movement that I will probably just sit them in a blob of
grease. This will keep dust out of the contact points. It will
absorb a little energy as the boom swings, but a lot less than I will
have to absorb, elsewhere, to achieve the desired damping.
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