ScratchJena

[ScratchJena]

thanks a lot,
I'll keep you up-to-date, to the limit by opening new topics. Primo step: the Desk with electronic ruler, I will also be comfortable with the rest of the mechanical processing.

See you soon!

[ScratchJena]

Thanks to everyone for the valuable answers.
I summarize what I have understood so far:
– Although it is preferable to start getting experience with manual processing, considering previous experience, although dated, building an electronically controlled zeiss machine could be interesting anyway, also thanks to the possibility of removing any (and devastating) periodic errors, for example by giving prime rotational speeds to each other. To the ugly ones, only the axis of the rotary table is used, which is in any case convenient.
– Placing the turntable on a tub for easier cleaning seems like a good idea.
– The processing of a mirror 300 F / 5 as a first test is optimal in terms of times, costs, collected experience and executive difficulty
– The 3m @ 5um electronic scale is not needed. However, since I would have applied it to a general purpose bench, if truly an absolute encoder from 3 m coast 50-60$, gluing a decent meter and applying a vernier on the edge costs absolutely a little less, so at the limit it is overkill but not so devastating (that is, it doesn't matter if the focal length is 1500 or 1508, since it is absolute, I can read the focault around the focal length, and having the 5um in electronic reading is very convenient), then I can also use it for something else.
– I forget the slit and the spherometer, to check the depth of excavation just the ruler and the crescent and the template.

Thanks a lot for the information, See you soon.

[ScratchJena]

Hi Massimo, thank you so much.
The point is that, mindful of the previous experience, I really wanted to try to switch to machining also because:
– I think a rotary table is comfortable anyway, so once I make the card for an engine I can also make it for 3 (as I record), although I could make them modular, prepare outputs for additional shafts and eventually re-flash the controller.
– I wanted to play a little’ with the effects of the various races, getting rid of the variability in terms of regularity.
– On the other hand, I think the desk with the electronic scale is useful in general terms, reading a distance on an absolute encoder a 5 microns (there is also the ad version 1 microns but I'm afraid it costs a kidney) it is easier and faster than with a tape measure and a vernier (that if it suits me is centesimal), moreover, it is easier to make a few dozen measurements to have a decent statistical dispersion.
– I enjoy playing with electronics and PID controllers.
Thank you.

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