Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Direct Drive Mounts

equipment mount
  • Please log in to reply
11 replies to this topic

#1 WalterG

WalterG

    Explorer 1

  • -----
  • topic starter
  • Posts: 59
  • Joined: 26 Dec 2011

Posted 16 November 2019 - 01:46 PM

Here is my question, does anyone know of other direct drive mount manufactures other than PlaneWave and ASA mounts?  I know they cost an arm and half a leg but they are amazing mounts. 

 

Thanks Walter



#2 DS INC

DS INC

    Vostok 1

  • -----
  • Posts: 164
  • Joined: 17 Jun 2013

Posted 16 November 2019 - 02:05 PM

Software Bisque now, just announced direct drive Taurus and Apollo.


  • WalterG likes this

#3 macdonjh

macdonjh

    Aurora

  • *****
  • Posts: 4666
  • Joined: 06 Mar 2006

Posted 16 November 2019 - 08:41 PM

Software Bisque now, just announced direct drive Taurus and Apollo.

 

Very nice, but out of my budget.  By a full order of magnitude.  smile.gif 



#4 lambermo

lambermo

    Viking 1

  • -----
  • Posts: 905
  • Joined: 16 Jul 2007
  • Loc: .nl

Posted 17 November 2019 - 04:33 PM

Astelco http://www.astelco.c...-telescopes.htm
AOK http://www.aokswiss....rkules_v24.html


  • psandelle and brave_ulysses like this

#5 ezwheels

ezwheels

    Viking 1

  • -----
  • Posts: 554
  • Joined: 04 Jul 2017
  • Loc: Oakland, CA.

Posted 18 November 2019 - 02:49 AM

Xerxis



#6 macdonjh

macdonjh

    Aurora

  • *****
  • Posts: 4666
  • Joined: 06 Mar 2006

Posted 18 November 2019 - 09:16 AM

I guess with Astelco, AOK Swiss and Xerxes if you have to ask, you can't afford it? smile.gif  Too bad you can't use the Xerxes products near the Mediterranean Sea, the Spartans might come and destroy it.

 

Thanks for posting these links.  It's good to know there are so many options out there besides the usual suspects.


Edited by macdonjh, 18 November 2019 - 09:16 AM.

  • 555aaa likes this

#7 f300v10

f300v10

    Ranger 4

  • -----
  • Posts: 342
  • Joined: 16 Sep 2018
  • Loc: Marietta, GA

Posted 18 November 2019 - 11:55 AM

The Planewave L-350 with equatorial wedge is around $12,000 and includes absolute encoders.  Thats actually slightly under the price of the similar weight class AP 1100AE.


  • WalterG likes this

#8 EFT

EFT

    Vendor - Deep Space Products

  • *****
  • Vendors
  • Posts: 5340
  • Joined: 07 May 2007
  • Loc: Phoenix, AZ

Posted 18 November 2019 - 11:50 PM

Alcor:  www.alcor-system.com/new/Mount/Nova120.html

 

10Micron:  www.10micron.com


  • WalterG likes this

#9 deepanshu29

deepanshu29

    Vostok 1

  • -----
  • Posts: 181
  • Joined: 16 Jul 2017

Posted 20 November 2019 - 07:40 PM

The Planewave L-350 with equatorial wedge is around $12,000 and includes absolute encoders.  Thats actually slightly under the price of the similar weight class AP 1100AE.

I think L-350 has incremental encoders, not absolute. 


Edited by deepanshu29, 20 November 2019 - 07:40 PM.

  • psandelle likes this

#10 f300v10

f300v10

    Ranger 4

  • -----
  • Posts: 342
  • Joined: 16 Sep 2018
  • Loc: Marietta, GA

Posted 21 November 2019 - 08:04 AM

I think L-350 has incremental encoders, not absolute. 

Yes, I think you're correct.  On closer reading the Planewave page states the L-350 features "High resolution encoders", and "Home position sensors".

 

Having never had a mount with encoders I confess to not really understanding the differences between the types.  I take it absolute encoders always know their exact position?  While incremental encoders measure the difference from a starting location?  If that is correct, what is the functional difference between the two types if the L-350 can always find and start from the home position?  Once starting from the home position the relative encoders would seem equivalent to the absolute.



#11 555aaa

555aaa

    Vendor (Xerxes Scientific)

  • *****
  • Vendors
  • Posts: 1483
  • Joined: 09 Aug 2016
  • Loc: Lynnwood, WA, USA

Posted 21 November 2019 - 09:43 AM

Most of the smaller direct drive mounts including the L350 don't have a brake or lock mechanism to hold the mount fixed when it's powered off, so with incremental encoders the mount has to be moved to an index position. No need for movement with absolute encoders but they cost more. Also we use the absolute encoder to eliminate the need for a separate commutation phase angle sensor or a "jog" on startup. Of course in many pro observatories they just leave their mounts on all the time. The question about brakes comes up a lot. I spoke with some of the other vendors on this topic and on the smaller mounts they don't seem to be needed. If you add a brake then people might abuse it by making the mount very unbalanced and then if it slips they will be unhappy. A direct drive mount needs to be balanced always and you will know quickly if it's not.

Edited by 555aaa, 21 November 2019 - 09:55 AM.


#12 MCinAZ

MCinAZ

    Mariner 2

  • *****
  • Posts: 219
  • Joined: 23 Jul 2011
  • Loc: Northern Arizona

Posted 21 November 2019 - 10:17 PM

  Considering that a home operation with a PlaneWave L-series mount requires less than 10 seconds, that requirement at startup is unlikely to be a factor for most people. As noted above, balance is important, particularly if a wedge is used.


  • psandelle and WalterG like this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics





Also tagged with one or more of these keywords: equipment, mount



Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics