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Old 18-02-2008, 06:39 PM
Glenhuon (Bill)
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Glenhuon is offline
 
Join Date: Apr 2007
Location: Geraldton, WA
Posts: 1,440
Surplus Shed 102x900FL OTA

Received the package this morning, so got right into it.
Did a bit of searching around town for suitable pipe, but nothing available apart from truck exhaust pipe (too heavy) so settled for 100mm PVC.
Its 1mm too big in OD, but an hours work with a coarse file and some emery cloth brought it down to size.
The objective has 3 screw holes for holding it in place, beware, they are not evenly spaced. If you drill through, mark one hole and the tube so it goes back the same way if you remove it.

Turned next to the focuser. Its spigot diameter is 95mm so had to bush the inside of the tube down to suit. The Pad Repair Fitting to the rescue again. These fittings are tapered inside and out. I cut it off at the shoulder and found that the ID at that end was narrower. It also wasn't a real tight fit inside the 100mm. As you can see in the pic I cut right through it lengthwise, the focuser spigot slipped inside and it expanded the OD enough to make it a snug fit in the tube. The focuser spigot has 3x4mm tapped holes in it so marked them driled and fitted 3 salvaged screws to hold it in place.

Tube was initially cut purposely too long, lots of taking off tools here, not many puter oners
Tried it with only eyepiece, too long, cut of 100mm. OK
Tried with 2" diagonal. too long, cut off 80mm.

Dust cover is off a 50 pack of CD's, perfect fit.

Made rings from 100mm pipeclips, used the redundant plate from the 80mm to mount it up and ready for first light

Tube has still to be flocked inside, fine tuning of length and find something for a dew shield, but essentially all done.

Time taken 8 hours, including running around looking for "bits that fit".

Yes, I'm tired

Bill
Attached Thumbnails
Click for full-size image (102mm Telescope 001 [].jpg)
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Click for full-size image (102mm Telescope 002 [].jpg)
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Click for full-size image (102mm Telescope 003 [].jpg)
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Click for full-size image (102mm Telescope 004 [].jpg)
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Click for full-size image (102mm Telescope 005 [].jpg)
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Click for full-size image (102mm Telescope 006 [].jpg)
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Click for full-size image (102mm Telescope 007 [].jpg)
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Click for full-size image (102mm Telescope 009 [].jpg)
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