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Rack&Pinion focuser - 3D-printed


Chriske

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All parts (except for the bearings) are printed
Almost done. Only thing to do is to install a spring to that little gear. Here again the pressure on the focusing-rod is springloaded, just the same as in a few of my other focusers.

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49 minutes ago, Dr_Ju_ju said:

Great job, one thought, replace knob with stepper motor for auto focus ?

Some of you will know I'm busy making all sorts of (printed)focusers. Well in the future they will all be modified/redesigned to add a stepper.

As matter of fact one already is modified to allow a stepper.
The white one is exactly the same as the black Crayford, except it is a bit shorter.
The black one has already a tiny endstop built-in(that endstop is cannibalized out of a  old Microsoft mouse btw. So you see Microsoft does make things that are actually usable...:laugh2:)

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This little stepper is just the right size, cannibalized these little guys from old tape-streamers.
Gears and two axis will be removed to make room for that stepper.

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Nope, this one is not good, not good at all...!
The gear is springloaded but the more tension I apply to it the more I actually feel the teeth while focusing.:ohmy:
Second the movement is way to coarse so this focuser needs a dual speed knob or I need to find me a very small rack&pinion set. That'll be plan 'B' I think.

To have an idea about it's size, that lower adjust bolt and nut are M3. The upper little bolt is M2.5

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The main body is printed in PETG, eyepiece barrel is printed in PLA.
As you can see some more tuning is needed to have that PETG's perimeter perfect. That barrel itself is near perfect.

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