rebuilding a 6" f/15
- Hi all,
Im new to ATMing and just got a 6" f/15 jaegers for dirt cheap. Its
not going to be my main observing scope or anything, just a planetary
killer and a show piece, plus something fun to work on for a while.
Its in green PVC pipe so im rebuilding the entire OTA and need to make
a mount. I dont want to folded, I want a big impressive scope. Im
going with a simple alt/az mount to hold it and an aluminum tube.
A few details im still working on, the focuser. I cant sink too much
into this. The williams optics refractor focuser looks nice but they
offer one without a mounting base for $50 less, so I figure I could
just rig up a way to attach it and save $50? I dont think it will have
a long draw tube though, i'd like around 5-6" of length. I was
recommend the burgess optical 2" crayford for $89, doesnt rotate but
its supposed to be good. Anybody know if it is as good as the WO? Are
there other options for $150 or less?
The mount and all is also still fairly up in the air. I know I want a
dob like mount on a tall tripod. I can get a set of big 5-6' long legs
BUT I think they're too big for my nissan sentra. Im making the tube a
split tube, 3 sections, that way I can transport it. I can get the big
legs for dirt cheap too so maybe get them and cut them down a bit? If
I made a short pier for the mount to go on that could shorten the legs
a lot. Would maybe 4' tall legs and a 1' tall pier be a good
combination? The tube is 90" long, I dont mind getting on the ground
but I dont want the public to be on the ground that much, trying to
keep it like a 1' to 1 1/2' off the ground at zenith.
Does anybody have plans for a baffle system like the size increments
and distance for each one? I'll likely be using a 7" OD tube. I plan
on rigging up a mount this summer. Im a college student so it wont be
worked on much during the fall. I'd want the mount to be done in time
for mars though, then rebuild the OTA that winter probably because of
finances this summer. If I get lucky I might be able to do it this
Any thoughts on how to connect the aluminum tubing? I cant thread it
and its not perfectly round. Its coming from hastings pipe company.
- Im going with 2 joints, so it'll break down to 3 pieces. I cant get a
big tube in my nissan sentra, so this works out real well.
--- In firstname.lastname@example.org, "Bob May" <bobmay@n...> wrote:
> I'd make the joint between two tube sizes a break apart joint
> more than anything else. The price difference isn't that great
> at the 7" level of pip size. I've got a 6' limit on the size of
> anything going into my car which would mean that a 6" F12 would
> need to have a point of breaking apart so that I can get the
> scope into the car. The focuser and the objective with it's
> shield will make the scope more than 6' long so there needs to be
> a point where the two ends have to come apart.
> I'd also suspect that shipping will be a bit cheaper if you don't
> have to go to a oversize box to hold the tube when it comes to
> you from Hastings but that is again only a few bucks.
> Bob May