[DeTomaso] Oscillating vibration

[Tomas Gunnarsson]

Two (or more) piece driveshafts shouldn't be a problem. You just align any two halves separately against the U-joint between them.

Tomas
----- Original Message ----- 
From: "Thomas Tornblom" <Thomas.Tornblom at hax.se>
To: "Dan Mixon" <tipo874 at comcast.net>
Cc: <MikeLDrew at aol.com>; <cengles at cox.net>; <guson at home.se>; <detomaso at realbig.com>
Sent: Monday, August 27, 2007 7:38 AM
Subject: Re: [DeTomaso] Oscillating vibration


Dan Mixon skrev:
> I disassembled my half shafts a couple weeks ago. Apparently whoever had
> assembled them last didn't know about the alignment arrows. One half shaft
> was 90 degrees out and the other was one spline out. Never had any
> vibration.

If the shaft is perfectly straight, i.e. no angle that the joint has to 
take up, then there will be no vibration even if the joints are mounted 
out of phase. The vibration issue worsens with increasing angles.

CV (Constant Velocity) joints were created to eliminate this problem.

I'm not sure how drive shafts with three U-joints are supposed to work 
though...

> 
> Dan

Thomas

> 
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
> Behalf Of MikeLDrew at aol.com
> Sent: Sunday, August 26, 2007 5:04 PM
> To: cengles at cox.net; guson at home.se
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] Oscillating vibration
> 
> 
> In a message dated 8/26/07 12 48 53, cengles at cox.net writes:
> 
> 
>>
>>               "Half-shafts in phase"......?     I recall hearing of this
> in
>> the past, but I can't remember what the heck it is.   Could you refresh my
>> failing memory?
>>
> 
> The halfshafts can be disassembled, by unthreading the collar in the center 
> and separating the two halves.   They are 'clocked' and balanced, and there
> are 
> arrows stamped on each side to ensure that they go back together the same
> way 
> they came apart.   But the splines are universal, so you can accidently
> clock 
> them in any number of different ways.   If the U-joints aren't properly 
> liined up with one another, it will create a horrendous vibration problem!
> 
> Mike (who sat for hours on the side of the road in rural England with George
> 
> Gordon-Smith and his Mangusta, waiting for a tow truck, after he picked it
> up 
> from a race shop that had tuned the suspension and accidently put the 
> driveshafts together wrong, leading to horrendous vibration at certain road 
> speeds....)
> 
> 
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-- 
Real life:   Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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