17" CDK and Equatorial Mounting
Posted 28 October 2012 - 12:31 AM
Next I will make the rest of the parts for the RA housing and there is quite a bit of work there =)
Posted 28 October 2012 - 01:43 AM
I've been following your build over the last few weeks and you're coming to the part I find particularly interesting now, the building of the equatorial mount. I hope you don't mind me asking what size shafts/bearings you're using? Also, will the shafts be solid or hollow, and what kind of bearings are those?
Fascinating build, thanks for sharing it in such detail.
Posted 28 October 2012 - 06:49 PM
Posted 30 October 2012 - 01:04 AM
just wondering how are you setting the pre load on the bearings ?
Posted 30 October 2012 - 01:38 AM
Posted 30 October 2012 - 06:18 AM
Posted 30 October 2012 - 12:35 PM
Posted 26 December 2012 - 07:55 PM
One good news though, the optics for the CDK are being made and I should have them in 3 months!
Posted 04 April 2013 - 06:21 PM
The optics are almost finished (probably a couple of weeks + another 4 weeks for surface shipping)!
Also I am hoping to move to the mountains (mount Pinot area, CA) toward the end of the summer, where I'll finally be able to build a small observatory.
Posted 29 April 2013 - 10:38 AM
I've also sent out the RA shaft for manufacturing, all the lathes I could use for this were just too small. I've got an ETA of 2 weeks for the shaft, meanwhile I'll try to finish the RA housing (several CNC parts) as well as the DEC housing which needs to be installed at the end of the RA shaft before it's assembled on the mount.
Posted 02 May 2013 - 10:46 PM
It was a little tricky as some electronics (line receivers/comparators) but it works!
Everything was done on test boards, I am going to make a couple of PCB for a more compact/reliable interface.
Posted 21 May 2013 - 07:55 AM
Awesome work thus far - Cant wait to see the finished product!
Posted 22 May 2013 - 11:15 PM
I'm making some modifications to the rear end cap of the RA shaft by adding a high resolution shaft encoder (resolution of 0.41 arcsec). It doesn't change things much especially as I had not made any of these parts yet. The encoder will probably not be initially supported by the controller but it should at some point
Posted 27 May 2013 - 12:30 AM
Posted 27 May 2013 - 10:01 AM
Posted 01 June 2013 - 12:25 AM
Posted 17 July 2013 - 11:59 PM
Currently in the process of moving to a new home where I'll have the observatory for this project. Still waiting on the optics, final figuring has been taking longer than expected apparently.
I am in the process of finishing the parts for the RA housing.
Posted 18 July 2013 - 09:13 PM
A couple questions:
What goes in to bearing selection? I'm not at versed in bearings and am curious how one selects a bearing that won't introduce errors in tracking.
What type of problems (if any) have you had going from Solidworks->Real world? Is the workflow really Solidworks to CNC and everything truly fits together?
Thanks! Amazing build
Posted 19 July 2013 - 01:03 AM
I went with high quality tapered roller bearings which should be adequate, practically I don't know yet if this was a good choice or not.
In terms of translating CAD work into actual parts, I spent a bit of time making sure dimensions and tolerances would be adequate and then it's a question of respecting this during the manufacturing process. Luckily I have some experience here and so far everything's been working fine. But it's far from complete.
Posted 02 August 2013 - 12:47 AM
Also I am moving to my new house this week-end. I was there last night to drop some stuff. The last 10 miles are absolutely dark (blue zone) - we could make out the Milky-Way looking through the driver side window of my car... I knew skies were good (kind of why we chose this area) but that good? wow. I never had the chance to test the skies before moving! I'll be imaging from there this week end with my wide field setup. Anyway kind of off topic just to say that I'll start working on the observatory shortly also!