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  #61  
Old 13-06-2022, 08:21 AM
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Joshua Bunn (Joshua)
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Quote:
Originally Posted by JA View Post
Alternatively (if using the slit tube) you could lock the assembly using a separate split locking collar not unlike an OTA split tube ring.

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JA

Hi JA,
I believe that is a Similar concept to what I suggested in my last sentence. I'll put up a drawing tonight
Thanks,
Josh
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  #62  
Old 13-06-2022, 01:45 PM
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Quote:
Originally Posted by Joshua Bunn View Post
Hi JA,
I believe that is a Similar concept to what I suggested in my last sentence. I'll put up a drawing tonight
Thanks,
Josh
Hi Josh,

What I got from your last sentence description was a locking mechanism (2 tabs + screw between them) something like this....
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I was suggesting a not dissimilar OTA split style clamp - I should have added of the hinged type (like a mini Parallax Brand clamp, which could bear down on a plain outer surface of the red ring, however, now reconsidering it given the slim size, forget it. Yours would be easier to manufacture. Heck, one could even use a jubilee style hose clamp if there was a plain outer surface on the red outer part to help quick prototyping.

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JA
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  #63  
Old 13-06-2022, 02:15 PM
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Hi JA,


Yes exactly like that.
I to thought of a something like a hose clamp or an over center clamp, but that would be too bulky, would look kind of unsightly and would need another tool to operate
So, yeah I recon something like in your photo would do the trick, it would easy enough to manufacture, be made to look aesthetic and easy to use.
I'm actualy going to make the clamp integral to the outer rotation threaded ring.

Cheers
Josh

Last edited by Joshua Bunn; 13-06-2022 at 02:50 PM.
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  #64  
Old 14-06-2022, 01:51 AM
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I'm thinking something like this. Its the same as Stefans design, but with the compression ring which also acts as the rotating ring. That is an m4 bolt, probably overkill, I may reduce the size of it. There are no real beveled edges on this drawing, the real thing will have, though.


Josh
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  #65  
Old 14-06-2022, 04:28 PM
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Should work. For locking, maybe even a thumb screw with an 8mm diameter head might be sufficient.
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  #66  
Old 14-06-2022, 08:24 PM
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Should work. For locking, maybe even a thumb screw with an 8mm diameter head might be sufficient.
Indeed: NO tools. A thumb screw/knob is essential.
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  #67  
Old 14-06-2022, 08:36 PM
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I appreciate the desire for no tools, however, this is something that will get used a few times then not anymore for a while just like a tilt adapter, which uses tools. Having said that, Ill try to fit in a thumb screw/knob, big enough to get enough purchase on it.
The other limitation with a thumb screw is the head really shouldn't be any bigger in diameter than the width of the adapter, in this case 8mm, to avoid it hitting any other adapter that might be near the face of this adapter.

Josh

Last edited by Joshua Bunn; 14-06-2022 at 11:30 PM.
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  #68  
Old 15-06-2022, 06:10 PM
MarkInSpace (Mark)
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ohh - so these dont exist? I've been looking, but never found one!!

Quote:
Originally Posted by Peter Ward View Post
My wish list would be a thin non-rotating focuser/spacer...AP (2.7") threaded..

Say 8mm-13mm thick (i.e 5mm of travel) . to allow for perfect backfocus adjustment.
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  #69  
Old 04-07-2022, 02:00 PM
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Cool, it'll be interesting to see what you think of them.
they turned up today! And of course, there's so much rain here I could fill a pool within a day. Will be a while until I can test them out, but they appear to be fairly simple. 3D printed and thickness of 0.7mm, 0.6mm and 0.48mm (should be 0.5, but I'm splitting hairs )
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