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  #41  
Old 11-06-2025, 08:04 PM
Hedworx (Luke)
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And of course it is cold, wet and raining!!!
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  #42  
Old 11-06-2025, 11:45 PM
Leo.G (Leo)
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Oh, I thought the rim centre was going to be a bearing point but I just realised the bolts to the brackets. It's still an amazing looking set up!
Do the rims roll in any particular material to protect the timber?
Looking back it looks like a strip of mild steel but I'm both blind and stupid!

Probably nothing this sort of weight (I don't have a working crane) but I've often used the yellow tongue from flooring to act as a bearing/sliding surface which removes risk of wear and is easily gotten and replaced.

Do you have a permanent smooth concrete area to roll it out on?
Sorry, I always over design everything and I'd have to have a lead base so it was counterbalanced at all times, that or outriggers. Then again, I have a sloping, uneven yard and struggle to roll a welder on a stand without it rolling off (40Kg MIG welder).
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  #43  
Old Yesterday, 12:17 AM
Hedworx (Luke)
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Quote:
Originally Posted by Leo.G View Post
Oh, I thought the rim centre was going to be a bearing point but I just realised the bolts to the brackets. It's still an amazing looking set up!
Do the rims roll in any particular material to protect the timber?
Looking back it looks like a strip of mild steel but I'm both blind and stupid!

Probably nothing this sort of weight (I don't have a working crane) but I've often used the yellow tongue from flooring to act as a bearing/sliding surface which removes risk of wear and is easily gotten and replaced.

Do you have a permanent smooth concrete area to roll it out on?
Sorry, I always over design everything and I'd have to have a lead base so it was counterbalanced at all times, that or outriggers. Then again, I have a sloping, uneven yard and struggle to roll a welder on a stand without it rolling off (40Kg MIG welder).
Just outside the garage door there is a hardstand area where I do my imaging and observing from. I wouldn't want to wheel it much further than that haha, the thing weighs a lot.

The trunions sit on HDPE pads (2 per side) the pads are 10mm thick and seem to ride pretty well. The hdpe might not be quite as slick as tpfe but it feels pretty acceptable to me, I might put a bit of soap on the trunions to try make the movement an little slicker. It isn't that it is sticky now, just the scope being so heavy makes the movement a one hand job instead of one finger job, oh the travesty.

Overall I am very pleased with the build. Only drawbacks at this stage is the insane top-heavy nature of a tall mount like this, one must be very careful when moving it and moving around it. It does also seem to take a second or two to settle as the moment arm is so long, I guess any sufficiently long instrument suffers with that same problem.
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  #44  
Old Yesterday, 11:35 AM
Leo.G (Leo)
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Quote:
The trunions sit on HDPE pads (2 per side) the pads are 10mm thick and seem to ride pretty well. The hdpe might not be quite as slick as tpfe but it feels pretty acceptable to me, I might put a bit of soap on the trunions to try make the movement an little slicker. It isn't that it is sticky now, just the scope being so heavy makes the movement a one hand job instead of one finger job, oh the travesty.
I think bearings or teflon (sorry, PTFE) grease on the pads would make movement easier but you need that bit of resistance if you want any chance of sighting any target I would imagine, unless motors and gears were involved. I'm guessing once that weight starts swinging it takes some stopping?
The resistance stops the unit running away from you when adjusting the RA.



Quote:
Overall I am very pleased with the build. Only drawbacks at this stage is the insane top-heavy nature of a tall mount like this
Hence my mention of outriggers or heavy lead base. It's good you have a decent area to roll it though, that makes it much safer with the design and the height probably couldn't have been avoided with the length of the scope itself?

The build is extremely impressive!
Were I to own my own place and I had something extremely heavy I could leave on a more permanent mount but required moving to my viewing area and I had a decent concrete area to move it around I'd go rails. But my son is an absolute train buff (or was) and there would be a driven rail system designed whether I wanted it or not and, I'd go with it.
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  #45  
Old Yesterday, 07:52 PM
Hedworx (Luke)
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Thanks for the feedback Leo

Indeed, I concur. A more permanent installation is the endgame. This dob style base is only meant to be a temporary solution until I can mount it on an eq mount. The ASA DDM100 is in the pipeline but will be a few months away at the very least.
For a temporary solution this base serves a purpose and it seems to be sufficient for the time being. Ultimately a permanent pier setup is the goal but that will be a work in progress and span the foreseeable future.

Last edited by Hedworx; Yesterday at 09:43 PM.
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