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Old 01-06-2021, 03:37 PM
Cliff (Clifford)
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Anyone who can 3D print a small spacer

Hi,

I am trying to modify a flattener reducer but need a small

43mm outer diameter, 1mm thick, 9mm tall spacer ring maybe a couple of them.

Can anyone assist appreciate your help

Cliff
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Old 01-06-2021, 11:37 PM
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Joshua Bunn (Joshua)
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I dont have a 3d printer, but I can machine you one.
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Old 02-06-2021, 07:01 AM
Imme (Jon)
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Quote:
Originally Posted by Joshua Bunn View Post
I dont have a 3d printer, but I can machine you one.
.....and the work he does is extraordinarily good, quick and very reasonably priced.

Forget a rough 3D printed part if you ask me, do it right. $1,000’s worth of gear and using a plastic spacer doesn’t make sense to me.

....what do they say about the weakest link?
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Old 02-06-2021, 07:10 AM
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3D printer is excellent tool for prototyping and fast checking of concepts.. and for not very demanding parts in terms of precision and/or strength.

Very often I make 3D printed parts (gears for example), then machine them to achieve required precision for shafts etc..

Yep, do it right as Jon said.
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Old 02-06-2021, 01:41 PM
Cliff (Clifford)
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Quote:
Originally Posted by Joshua Bunn View Post
I dont have a 3d printer, but I can machine you one.
Thanks Joshua,

I hadn't considered a machined piece, that would be better.
let me confirm my measurements would have to be painted flat black also.

Its to go inside a Meade 0.63 focal reducer to remove the correction lens but leave the reducer as my Meade ACF is already corrected for flat field.

Cliff
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Old 02-06-2021, 01:55 PM
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Quote:
Originally Posted by Cliff View Post
...Its to go inside a Meade 0.63 focal reducer to remove the correction lens but leave the reducer as my Meade ACF is already corrected for flat field.

Cliff

Hi Cliff,

This is interesting. Could you share more info on this ?
Thanks,

Bojan


BTW, for this application you don't need mechanical strength.. so this could be printed with black plastic, or machined from black PVC or acetal (Delrin)

Last edited by bojan; 02-06-2021 at 02:22 PM.
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Old 02-06-2021, 09:16 PM
Cliff (Clifford)
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Hi Bojan,

Not an original idea one I found on a forum, the Meade and Celestron .63 Reducers/flatteners have two elements the one nearest the camera end is the flattener lens and the nearest the SCT side is the reducer so in theory if I remove the flattener/corrector and put the other lens back in its original position it should work just as a reducer for my ACF scope? Hence the need for a spacer.
There is one 4mm spacer which was originally between the two lens sets but needs about 13mm total so one spacer about 13mm might do it.

Doesn't need a lot of strength as you say the other spacer is metal though.

Cliff
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Old 03-06-2021, 06:29 AM
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Quote:
Originally Posted by Cliff View Post
...63 Reducers/flatteners have two elements the one nearest the camera end is the flattener lens and the nearest the SCT side is the reducer...
Hm.. don't be surprised if the outcome of this experiment doesn't meet your expectations.. because in optics those things/functions are rather distributed to the whole optical system instead of concentrated in particular element.
IMO you should sell this reducer as is and buy the reducer for ACF. I've read on CN they are available.
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Old 04-06-2021, 08:07 PM
Cliff (Clifford)
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You maybe right the two sections look the same but may be different just two cemented lenses in two groups.
Astro Physics has one and Optec has one that suppose to work, I have a Antares 2" 0.7 reducer not sure how good it is.
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