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Stub Mandrel

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Blog Comments posted by Stub Mandrel

  1. On 18/01/2021 at 14:58, Gina said:

    I've worked out that I should be able to get away without an extra gear pair but with higher ratios - though I have to test that out. 

    6:1 from chain wheel to centre wheel with the chain wheel going faster (can do this because the auto-winding can keep up with the faster chain drive).  Then two stages of 10:1 give the overall ratio from centre wheel (60m) to escape wheel (6s) of 600:1.  Or do you think I'm being too ambitious?

    The critical thing is how small (tooth count) a pinion can you use? You might consider using 1 mod gears?

  2. 2 hours ago, Gina said:

    This provides focussing using the thread of the lens mount (the lens has no focus mechanism).

    Be warned, some lenses will hit the sensor of the ASI 120 models if screwed in too far! May be worth adding a ring below the lens to stall the stepper if the focus routine tries to run the lens too far.

  3. I haven't used my casing yet... but I just printed a two-part base and glued the halves together. A USB cable goes in through a hole sealed with hot melt, there's a pocket for silica gel pouch(es) and I made a foam gasket for the dome. Hopefully sealed!

    Must try it out some time, but I only have the one suitable camera.

    • Like 1
  4. 1 hour ago, Gina said:

    Swapped motors and got a similar result except both X and Y drove the Y positively.  The NEMA23 Z motors are out for delivery and the couplers have arrived.

    Sounds like one motor may be reversed?

    I notice one is 'upside down' which would reverse the sense of direction.

    Try unswapping them then flipping the connector on one stepper

    • Thanks 1
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