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Paul Derby
newbie
Reged: 05/21/06
Posts: 4
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Re: Axial Port adaptor? - choices?
05/09/08 10:43 AM
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I would like to buy a Questar to helical focuser adapter that would allow me to use the Borg 7315 focuser on my 3.5" Questar made in 1991. I purchased a Borg 7315 focuser and a Borg 7316 nosepiece. I have a nosepiece adapter that screws into the Questar axial port, which is 30mm x 0.75 pitch threads.
This combination doesn't work because of the "slop and binding" in using thumb screws to hold the Borg 7316 into the nosepiece. For some reason s binding occurs and the helical focuser will not rotate smoothly.
Ideally, I would like to have a 7316 nosepiece that has the unthreaded end turned down to a bit less than 30mm and machined with .75mm threads. This way I could screw in the nosepiece directly into the axial port of the Questar.
Is it possible to buy a modified 7316 nosepiece that will work as an adapter from the Questar axial port to the 7315 Borg focuser?
I do not have access to a machine shop. I'm looking to buy the part that Barry made and described here: http://www.barrie-tao.com/questar_life.html
Is there an alternative that eliminates the "slip fit" coupling?
I'm trying to attach an Imaging Source camera to the axial port on my Questar. The Imaging Source cameras don't use T-Mounts so the Questar swivel couplings and extension tubes which I already own aren't the answer.
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