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

OnStep on a CG-11

ATM DIY mount 3d printing
This topic has been archived. This means that you cannot reply to this topic.
54 replies to this topic

#51 calypsob

calypsob

    Cosmos

  • *****
  • Posts: 8,956
  • Joined: 20 Apr 2013

Posted 30 October 2017 - 09:53 AM

I made the motor mountings to connect the NEMA 17 steppers to the existing out of a piece of aluminum using only a table saw, drill press, and an inkjet printer. I drew up the adapter schematic in FreeCad and then (2D) printed it to scale and glued it to the aluminum plates. Then, a machinist punch was used to create a dimple in the aluminum so that the holes could be accurately drilled on the drill press.

 

After a lot of search on ebay, I found some suitable motor couplings to connect the stepper motor shaft to the worm. The trick here was finding couplings that had an outer diameter less than 18 mm (I think) since there is limited clearance on the mounting plate that holds the worm blocks. Most couplings for shafts of this size have an OD of closer to 25mm. This wouldn't be a problem if you have access to a lathe, though.

 

I designed and printed some friction fit covers for the motors that the DIN connector could be screwed to so the stepper wires couldn't get yanked around. This works pretty well, but I've found that the long stepper motors can torque the 2 screw motor mount on the G-11 enough to flex quite a bit.

 

attachicon.gifmotor.jpg

This is an awesome project.  BTW if you used pla to print and have trouble with the plastic shrinking or falling apart, try using petg, it works incomparably better for cold/hot/humid weather conditions.  



#52 pterodyne

pterodyne

    Explorer 1

  • *****
  • Posts: 70
  • Joined: 14 Jan 2009

Posted 13 February 2018 - 08:56 PM

TonyStar,  I know this is a little bit older thread, but I was trying to follow what you did with the teensy/arduino shield adapter/protoboard, do you have a schematic of how you wired it all up?  I was trying to do it but failing.  I have the teensy 3.2, arduino adapter shield, protoboard (arduino shield sized), and some tmc2130 or DRV8255 available.

 

I may go the miniPCB route, but since I already purchased all this it would be nice to get it working.  Ive followed some other schematics online, but it seems that most are mega based or teensy based (without the shield.), so having troubles with which pins go where, then having to modify the pins file before upload.

 

Thanks for any info, kind of learning a lot of this as I go. 



#53 TonyStar

TonyStar

    Viking 1

  • *****
  • Posts: 761
  • Joined: 25 May 2013

Posted 14 February 2018 - 10:11 AM

do you have a schematic of how you wired it all up?

I don't but I basically followed the fritzing diagram on Howard's wiki. I recommend that you assemble and test the circuit on a breadboard first and then proceed to solder all the components on the shield. 



#54 Geo.

Geo.

    Vendor - Nexstar Parts

  • *****
  • Vendors
  • Posts: 5,711
  • Joined: 01 Oct 2008

Posted 17 January 2019 - 11:38 AM

I have spare PCB boards and components here in the U.S. PM me for what is currently available. The OnStep group is now at Google groups. onstep@groups.io


Edited by Geo., 17 January 2019 - 11:40 AM.


#55 Charles Lemaire

Charles Lemaire

    Lift Off

  • -----
  • Posts: 14
  • Joined: 12 Mar 2016

Posted 06 April 2019 - 02:17 PM

Hi,

 

An other example of CG-11 upgrade:

https://groups.io/g/...G11-upgrade-kit

 

all files are online

 

Charles




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






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics