Re: [APML]: Byers drive and the MototrakIV

[Mike Regish <mregish@map.com>]

>
>
> Hi Mike;
>         The Hurst motor on my 7.5" Byers drive blew out on me int he
> fiedld this past
> Thursday night.  Actually, something went ka-ka int he gear box fromt
> he looks of
> things.  Really P.O.'d me off, as it was first light witht he new 4x5
> sheet film
> astrograph at a local Starparty I was at for 4 days.
>

4x5 film??? That's going to be awesome!!!

>
>
> PS...does anybody have designs/picture of a spring mounting for the
> worm to the gear?
> My worm is just held into place by two bolts against eh wheel, but I
> would like to
> adapt a spring mount if possible.

Chuck Vaughn sent me a photo of his worm gear assemble. I don't know
what you're starting with for a worm block, but I think it would take
some machining to get a good, solid spring loaded worm movement. The
whole bloch that the worm and motor are mounted on are hinged with a
ground socket head screw so that there's no play, but it doesn't bind.
At the other end of the block, mounted below it on the plate is a small
block with a small spring that pushes the worm against the RA gear. It's
mostly to take up any lack of concentricity between the shaft hole and
the gear circle. It will keep the worm from binding against the RA gear
or running too far away from it and allowing slop. It's simple, but I
don't know how hard it would be to accomplish on an existing drive.
Don't have a Bridgeport in the basement, do you? ;-)

>
>
> --
> joneil@obs.empath.on.ca
> http://www.multiboard.com/~joneil
> Astro-photo, infra-red, large format, B&W
> and a single picture of my psychotic cat.