Hi Randall,
When I had my shop in PA, we mounted the hub(s) in our lathe by utilizing
the 3 jaw self-centering chuck. This chuck was integrated into an 18" facing
or backing plate. There is (was) enough meat on the edge of the hub to grab
it and lock it down. The 18" or 20" (can't remember) plate appears large to
most, but we needed it to open bore holes in saw plate that went up to 16"
in diameter. We held the saw plate the same way as the hub to cut the bore
holes larger.
Alex
----- Original Message -----
From: "Randall" <TR3driver at ca.rr.com>
To: <Triumphs at autox.team.net>
Sent: Wednesday, January 19, 2011 10:40 PM
Subject: Re: [TR] Wheel wobble/ Bearing race Cups?
>> Not sure you have this capability, but mounting the hub in a
>> lathe and
>> checking with a run out gauge would tell you.
>
> Just curious, Alex, how would you mount the hub in a lathe?
>
> That was my first thought as well, but I couldn't think of any way of
> mounting the hub that wouldn't potentially introduce more error, short of
> turning a bearing-shaped mandrel. Since I already had the bearings and
> spindle to fit, that seemed the most accurate method to me.
>
> Cosmo wrote:
>> BUT I questioned this method because if the hub's Bearing
>> Race Cups are NOT
>> mounted into the hub parallel, then I feel that you will be getting a
>> reading of wobble; when the hub unit, it self, doesen't have
>> a wobble or
>> warpness at all.
>
> My feeling is that, once you have identified a problem hub, the way to
> check
> for a bearing race installation problem is to remove the races, carefully
> check the surfaces, then carefully install either new races or the old
> races. If there was an issue with a burr or piece of dirt holding a race
> in
> the wrong position, you should be able to find and correct it.
>
> Of course you can try just tapping the race deeper into the hub on the
> theory that it wasn't installed fully the first time. But as long as the
> hub has been installed and driven, I feel it is very unlikely that having
> a
> race not fully seated is the issue. The forces applied during cornering
> are
> enough to seat the races against their seats, if they weren't before
> (which
> is the reason it pays to recheck the clearances after driving a few
> weeks).
>
> -- Randall
>
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