Depth of focus and motor focus gear ratio

[Astrofriend]

Hi,
Earlier I have made a calculator to find the telescopes depth of focus:
http://www.astrofriend.eu/astronomy/astronomy-calculations/depth-of-focus/depth-of-focus.html

Now I have continued with a gear ratio calculator for the motor focuser:
http://www.astrofriend.eu/astronomy/astronomy-calculations/focus-gearbox-ratio/focus-gearbox-ratio.html

Sometimes it could be tricky to find the correct gear ratio and maybe this could be of some help.

It's important to have the stepsize about 5 times smaller then the depth of focus.

Note:
This is all new, I may have done some mistakes, check carefully before ordering any parts!

/Lars

[Astrofriend]

After I solved the problem with my focuser which is of friction construction I got a new problem. When I increased the friction force to get rid of the slip of the focuser the load on the stepper motor got to high. I need a new stepper motor with higher torque. I have not solved that yet.

But under meantime I have updated my gear box calculator how to optimize the ratio to it:
http://www.astrofriend.eu/astronomy/astronomy-calculations/focus-gearbox-ratio/focus-gearbox-ratio.html

I did a massive rewritten of the code, hope I got everything correct now.

/Lars

[Astrofriend]

I have now also added calculation to find the needed torque from the stepper motor.

http://www.astrofriend.eu/astronomy/astronomy-calculations/focus-gearbox-ratio/focus-gearbox-ratio.html

 

I had a lot of problem with this earlier, now less problem.

/Lars