[s-cars] alignment Q

[pkrasusky at ups.com]

awesome feedback all around - tx again

I like the pressed washer angle - I may have some tiny ones laying around

I did reduce the ID of the hub already to minimize scrub against the body, OD appears normal and could only tell if they pulled a wheel so that's "OK".

But if I can get a washer in thar, hmmm.  Or, I could 'fill' the hub from the back with the axle through the wheel with some sorta material, then drill it out so it's precise.  Hmm.  Material?

Sorry again WOB 8-(


________________________________
From: LL - NY [mailto:larrycleung at gmail.com]
Sent: Thursday, January 15, 2009 10:03 AM
To: Krasusky Paul (WQQ2PXK)
Cc: bob at chips-ur-s.com; s-car-list at audifans.com
Subject: Re: [s-cars] alignment Q

Can you perhaps use washers that are pressed fit to the axles (to contain the wobble)?

And yes, friction is independent of surface area. It's a surface area vs. pressure trade-off thing.  So, I'd avoid the scrub.

I'd think solid axle tuning. Usually on RWD solid axle cars, alignment in the rear is easy.

On 1/15/09, pkrasusky at ups.com<mailto:pkrasusky at ups.com> <pkrasusky at ups.com<mailto:pkrasusky at ups.com>> wrote:

Interesting on the surface area Bob.  Guess I shoulda stayed awake during Physics - too busy doing funnels (etc.) before school - sigh.

Sorry, I should have mentioned rules dictate use of supplied wheels, axles (sans modification), and no bushings / bearings.  Can use graphite which we are.

Tx.

-Paul



-----Original Message-----
From: Robert Myers [mailto:bob at chips-ur-s.com<mailto:bob at chips-ur-s.com>]
Sent: Thursday, January 15, 2009 9:35 AM
To: Krasusky Paul (WQQ2PXK)

Cc: djdawson2 at aol.com<mailto:djdawson2 at aol.com>; s-car-list at audifans.com<mailto:s-car-list at audifans.com>
Subject: Re: [s-cars] alignment Q


Dredging faint memories from my sophomore physics class ISTR that
friction forces are the result of coefficient of friction times the
"normal force".  Normal in this sense means perpendicular to the
surface.  The surface area has no part in the process.  Whether the
contact patch is razopr narrow or somewhat wider should have no effect.


Internal friction (from compression and relaxation of internal forces
when the rubber tire is flexed should be much lower for the virtually
rigid plastic "tires".  This should then reduce frictional drag from
the wheels rubbing on the axles.


A bushing?  Perhaps machine a slightly larger diameter
axle?  Elimination of wobble should help significantly by reducing
the normal forces of the wheel sliding on the axle.

Do the rules permit lubrication of the axle?

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