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Chriske
Kijkerbouw Urania
Reged: 08/15/04
Posts: 1953
Loc: Boechout, Belgium
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This single arm forkmount should be well planned to get that scope perfectly in balance.
In the drawings you'll see a hughe ball bearing for the altitude motion. If a single arm is used in combination with a larger scope I think there is no other way using a ball bearing. With smaller scopes teflon bushing can be used also. All depends on the weight of the scope and were you apply these teflon bushings.
In the drawings I used a carbon fiber pole. This pole can be replaced with an aluminum one or even a wooden beam. Both should be thick enough to prevent flexing.
Usage :
1- Small to large telescopes.
2- Reflector (mostly Newtontelescopes).
3- Transportable.
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Chris
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Steve J
newbie
Reged: 02/05/08
Posts: 4
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How would the OTA be held in place on the bearing in this design?
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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 5990
Loc: Bremerton Washington
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Here is my homemade attempt at a single fork mount on its elevation mech for my 4.5" newt.
It's temporarily bolted to the work bench for testing.
Rob
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www.goldmtobservingcenter.com
Providing a great place for amateur astronomers, and ATM's to come and enjoy their hobby.
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GlennLeDrew
professor emeritus
Reged: 06/18/08
Posts: 620
Loc: Ottawa, Ontario, Canada
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For a smaller profile altitude bearing, you might consider a pre-loaded thrust bearing. In such case the shaft length can be kept to a minimum.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Mediocre minds discuss people. Good minds discuss events. Great minds discuss ideas.
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NHRob
Carpal Tunnel
Reged: 08/27/04
Posts: 2557
Loc: New Hampshire
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I would recommend a larger area bearing surface, like that used in a DM6.
Polished alum. plate rotating against Teflon makes for a wonderful motion, not so sensitive to imbalance.
Rob
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Canon 12x36 IS binos
AP130EDT f/8 (for sale)
new 12.5" f/6 Royce conical mirror (for sale)
no free time ... lots of clouds !
" Life is what happens to you while you're busy making other plans" !!
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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 5990
Loc: Bremerton Washington
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Quote:
For a smaller profile altitude bearing, you might consider a pre-loaded thrust bearing. In such case the shaft length can be kept to a minimum.
In my case(as usual), I like to adapt used parts, or reworked parts, or parts not intended for the use I am applying them to.
The alt bearing here is a coupling of the existing DEc axis from an old EQ2. I incorporated it into the alt bearing housing of my fork mount. The aluminum plate is the original DEC setting circle with machined brass lock nuts and dial pointers. The clamshell clamp and the DEC slow motion control is from a 1957 4.5 Laffeatte newtonian.
I combined the two to make a very stable and very usable alt portion of the mount.
Here is a close up of the arrangment.
Rob
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www.goldmtobservingcenter.com
Providing a great place for amateur astronomers, and ATM's to come and enjoy their hobby.
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Mihai
member
Reged: 08/11/05
Posts: 36
Loc: Romania
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The telescope tube can be held in place on the mount with a roller bearing with adjustable friction brake,something like this: http://infinityscopes.com/UtiStory.htm (search the picture called "Tapered Roller Bearing w/Adjustable friction brake".Simple and efficient 
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