Making an equatorial platform
Posted 30 July 2005 - 09:56 AM
Posted 30 July 2005 - 10:01 AM
Posted 31 July 2005 - 10:26 AM
Posted 03 August 2005 - 08:42 PM
Posted 03 August 2005 - 08:52 PM
Posted 03 August 2005 - 08:59 PM
Posted 03 August 2005 - 09:10 PM
Posted 03 August 2005 - 10:40 PM
Posted 04 August 2005 - 03:00 AM
I don't see any screws , did you use dowels..?
I must admit, this concept is much more elegant than mine.
Marc, I asked miself the same question about these motors.
Posted 04 August 2005 - 07:16 AM
Posted 04 August 2005 - 07:28 AM
Posted 04 August 2005 - 07:37 AM
Remember I glued the triangle that the wedge sit on at ~6 degree angle so when it is moved by the motor it moves uphill pushing the rocker box slightly. The top of the wedge is parallel to the bottom of the rocker box. I haven't tested this yet with my 12 inch but I'm pretty sure it'll work.
Posted 04 August 2005 - 09:18 AM
Posted 07 August 2005 - 10:32 PM
It was very hazy tonight and I could hardly see Arcturus but I could test my platform out. With a 6 mm eyepiece in my 12 inch f/5 Arcturus stayed steady in the field with no slipping until it slowly drifted north (my polar alignment wasn't perfect). The north/south motor worked but with more periodicity than I'd like, it would speed up and slow down. I'll have to check into that and it needs limit switches too. The only other criticism I have is that the tracking motor is a bit noisy. A timing motor should be very quiet but perhaps I did something to it when I pressed it into the knurled shaft. I'll replace it and they're not very expensive anyway. All in all not so bad though, I spent about $15 on hardware and now another $20 for a tracking motor. My goal here was to show that it's not so difficult to build one of these.
Posted 08 August 2005 - 01:33 AM
On the RA driving motor, you did not mention if there where ballbearings to support the knurled schaft. Are there any..?
Posted 08 August 2005 - 05:23 AM
Posted 08 August 2005 - 06:57 AM
I used teflon blocks to support the knurled shaft. This is the same method I used on my first platform and the motors on it were quiet as a mouse (as they should be).
Posted 08 August 2005 - 10:26 AM
Thanks again for documenting this for our benefit.
Posted 08 August 2005 - 12:17 PM
Posted 07 October 2006 - 09:03 AM
Posted 07 October 2006 - 11:53 AM
Posted 07 October 2006 - 02:13 PM
Ed, I just realised how that north south motor works, thats brilliant. The motor moves the wedge up and down an incline to give you find Dec adjustments......
The correction made by that motor is there to correct the 'polar axis' direction. No correction in decl. is made with that motor at all. If one is observing with this mount say on the western horizon and correcting with that so called declination correction motor, it is turning completely wrong, that is 90° on the supposed decl. (altitude) movement.
Only when observing south one *could* correct in declination with that motor.
Or did I misunderstood the whole consept, Ed...?
Nice mount btw....
Posted 07 October 2006 - 03:37 PM