[R-390] Collins PTO Linearity adjust

[ews265]

Good morning  Pete and list,

I've pondered the same issues.  Came to the conclusion that for the kind 
of mechanical resetability needed to make the job manageable a stepping 
motor was needed.  Granted a complex solution but the most exact 
arrangement I could come up with.  To that end I've got all the 
mechanics of a fixture built; PTO mount, stepper, driver, etc.  It's 
very solid and should work well.  I've yet to write the software to run 
everything so I can't offer direct help now but throw the idea out to 
you or anyone interested.

Regards,
Jon Schlegel  WA3MVM


Pete Williams wrote:
> G'Day List...having rejuvenated a couple of  Collins 70-H2 pto,is there info
> available as to how best adjust the internal cams for linearity.?
>
> I have read Ray Osterwalds comments ex past issue of ER but this only
> addresses the 100kHz -one  turn of the shaft-calibration points.
>
> It would seem to be  laborious process to adjust these cams as there are in
> excess of 60 for the  complete travel of the  core, although, they are not
> all required for  adjustment for the 1 mHz  range .
>
> How the factory did it is one thing-- how one might do it now is  another
>
> My preliminary excursion into this finesse  appears to show that adjusting
> at the 100kHz points seems to take reasonable  care of what's in between,
> bit I'm sure there was a bit more to it, albeit labor intensive .
> A bit more light on this would be  appreciated.
> Tks 
> Pete VK3IZ     
>
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