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Equipment Discussions >> Mounts

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Per Frejvall
sage


Reged: 09/28/12

Loc: Saltsjöbaden, Sweden
Re: Harmonic Drive Telescope Mount new [Re: schluterdude]
      #6362516 - 02/07/14 05:43 PM

0.001° = 3.6 arc-seconds... Well above average seeing.

/per


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OzAndrewJ
scholastic sledgehammer
*****

Reged: 11/30/10

Re: Harmonic Drive Telescope Mount new [Re: schluterdude]
      #6362588 - 02/07/14 06:14 PM

Gday schluterdude

Quote:

and will repeat a position down to a 0.001* degree accuracy




So about 3.6arcsecs. ( I assume thats with properly calibrated software driving them as well?? )
How much do they cost???
ie the initial mount linked to quotes $6000 for the whole mount.
I have been looking for specs/prices on these sort of drives and so far i am seeing results like +/-1arcmin for larger units down to +/-10arcsec for the micro units.
( For anyone interested, the micro units are amazing. Basically the size of a bee.
http://www.orlin.co.uk/Micro_harmonic_drives.htm )

I guess like worms and anything else mechanical, there are ranges of quality in the drives and the price goes up with the accuracy.

Quote:

PE can be finessed out of the equation with good software driving it.




Again, thats part of my earlier query. ie what is the native PE of a gear design like this and how much effort goes into software / feedback loops to get the last bits of accuracy???
I have found a range of absolute positioning specs, but nothing on tooth PE yet.
I guess for most robotic operations, its only final position that matters, so they dont post specs on that side of things.
Interesting topic.

Andrew Johansen Melbourne Australia


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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Harmonic Drive Telescope Mount new [Re: OzAndrewJ]
      #6362670 - 02/07/14 06:56 PM

I would have to dig up engineering drawings of the system for their specs...

The system is run through a FANUC CNC control though... Costly!

Though, that's what we use for the entire machine. One can always use a different control. Pointing at and tracking a spot in the sky using two axis is MUCH different than using 5 to make a part! Easier in some respects, tougher than others...


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Odell
member
*****

Reged: 04/29/12

Loc: Florida
Re: Harmonic Drive Telescope Mount new [Re: schluterdude]
      #6362988 - 02/07/14 09:44 PM

Last time I corresponded with Leonard at GoTo & Tracking Systems he was closing his shop. I was going to have him do a conversion on my LX. Don't know if he's fired up his operation or not. I just had a Sitech conversion performed on my CGE. Haven't gotten out from under the clouds yet,so I don't have any solid accuracy numbers but it isn't a stock CGE anymore.

Ian


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