[Amps] Shaft Misalignment Solutions

[Russ Williams]

It is a long shot, but the old military TRC-110 repeater gear used various U-joint shaft couplings for the same purpose.  That is what I am using in my current 6 meter amp project.  The only limiting factor is the shafts are only 3/16" in diameter, but the couplings can be safely bored to 1/4".  Still, that may not work for your vacuum variable shafts which are often much larger diameter.

See attached photo.


73.
Russ W6OHM
   


--- On Thu, 1/22/09, Bob Maser <bmaser at tampabay.rr.com> wrote:

> From: Bob Maser <bmaser at tampabay.rr.com>
> Subject: [Amps] Shaft Misalignment Solutions
> To: "AMPS" <amps at contesting.com>
> Date: Thursday, January 22, 2009, 4:55 PM
> I am trying to make the front panel of my 4CX1500B amp look
> symmetrical and 
> pleasing to the eye.  Because I am using a 3" high RF
> deck, and have 
> restricted vertical space in the outer cabinet,  the vacuum
> variable and 
> roller inductor shafts are going to be misaligned relative
> to the EF Johnson 
> turns counters.  The shafts of both the vacuum variable and
> roller inductor 
> exit the RF deck front wall about 2" higher than the
> turns counter shafts. 
> There is 3.6" space between the front wall of the RF
> deck and the rack 
> panel. I am considering nylon gears, sprockets and belts,
> flexible shafts, 
> and those crazy shaft drives that are in the Nebraska SS
> catalog.  I want a 
> system that will not slip but not increase the rotational
> torque of the 
> turns counters. I am leaning towards the sprockets and belt
> approach(or 
> better yet, the chain or bead belts) with bushings in the
> wall of the RF 
> deck to support the far end of the turns counter shafts. 
> Can someone steer 
> me in the right direction?.  There must be some good
> websites to buy this 
> stuff.  I couldn't find anything on eBay.
> 
> Thanks,
> Bob Maser W6TR 
> 
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps