It depends on how fast you want it to move. If the answer is fast and you want to run direct drive then the motor has to be quite large and powerful. If you're happy to have it move slower then a high RPM but weaker motor with gearing will do the job. I don't know about in the UK but there are electronics shops over here that sell the motors and then variable gearboxes that you can use with them.
My assumption is that those cables are already heavily geared to the mount heed ? Several rotations of the knobs doesn't move the mount significantly ? Are you planning on having this setup constantly following the moon or purely as an electronic hand ?
My assumption is that those cables are already heavily geared to the mount heed ? Several rotations of the knobs doesn't move the mount significantly ? Are you planning on having this setup constantly following the moon or purely as an electronic hand ?
No I thought that instead of moving by hand it would be easier to have two of these motors one on the updown the other on the leftright
It could be done easily enough, but you would need a pretty high speed direct drive, or you would soon get impatient when slewing across a large part of the sky, and that would leave you finding very small movements difficult, so you
would ideally have a variable speed setup like the SW motor kit in your pic.
Would be cheaper to get a tripod already so equipped.
raymo
Aaah ... so you want the impossible dream. Unfortunately Jeremy there really is a reason why people pay quite a lot of money for what you ask, it is not trivial.
- a small altaz mount,
- that tracks,
- doesn’t cost a motza.
You can have any two, but not all three.
There are solutions but they all entail buying a new mount - not adapting yours which was never built with motorisation in mind.
A not insignificant part of this is that it entails a small computer of some kind to work out what speed/direction the motors should turn, for which it requires knowledge of the location, date, time and where the scope is pointing. And for that to work it needs encoders of some sort and also a calibration routine.
In other words the functionality of the SynScan handsets, or the equivalent.
Possible ways:
- buy an iOptron Cube, this is the simplest all-in-one altaz solution;
- buy a Skywatcher AZ-GTi, AZEQ5 or the much bigger AZEQ6;
- find and buy a secondhand T-Rex (has worm drives) and find a “train & track” gadget (was used with dobsonians) and somehow connect the two.
- buy a Losmandy AZ8, which has the worms and fit motors from the GM8 (which is similar but equatorial) then figure out how to build and program your own handset, by which time you will have earned a degree in electronics.
- buy a Rainbow Astro harmonic drive mount. That is around $US 10k.
Aaah ... so you want the impossible dream. Unfortunately Jeremy there really is a reason why people pay quite a lot of money for what you ask, it is not trivial.
- a small altaz mount,
- that tracks,
- doesn’t cost a motza.
You can have any two, but not all three.
....
You can have all three.. but as you yourself are not "electrical" person, you have to find a friend who is (or to persuade the exisying friend to join a "dark" side).
Then have a look at ONStap system. It will cost you $100 max. Plus friend
Aaah ... so you want the impossible dream. Unfortunately Jeremy there really is a reason why people pay quite a lot of money for what you ask, it is not trivial.
- a small altaz mount,
- that tracks,
- doesn’t cost a motza.
You can have any two, but not all three.
There are solutions but they all entail buying a new mount - not adapting yours which was never built with motorisation in mind.
A not insignificant part of this is that it entails a small computer of some kind to work out what speed/direction the motors should turn, for which it requires knowledge of the location, date, time and where the scope is pointing. And for that to work it needs encoders of some sort and also a calibration routine.
In other words the functionality of the SynScan handsets, or the equivalent.
Possible ways:
- buy an iOptron Cube, this is the simplest all-in-one altaz solution;
- buy a Skywatcher AZ-GTi, AZEQ5 or the much bigger AZEQ6;
- find and buy a secondhand T-Rex (has worm drives) and find a “train & track” gadget (was used with dobsonians) and somehow connect the two.
- buy a Losmandy AZ8, which has the worms and fit motors from the GM8 (which is similar but equatorial) then figure out how to build and program your own handset, by which time you will have earned a degree in electronics.
- buy a Rainbow Astro harmonic drive mount. That is around $US 10k.
I think I have explained it wrong (or people have got it wrong)
All Iis where to get a motor and control box from that can turn a small load, adding a bracket to the mount is easy
Eccoders, handsets have ZERO to do with it, no more than it has with a focusser
At its simplest you need a control box which will turn either motor in either direction as required, and unless you fit clutches so you can make large movements manually, it will also need to have a large speed range, unless you are prepared to wait half an hour for your motors to
take your scope to a new target many degrees from your current one.
This setup is not trivial.
raymo
Last edited by raymo; 06-05-2019 at 09:36 PM.
Reason: more text
Wander about your neighbourhood in search of a 'Ham Radio' operator, he or she will ham the skills that you need. 'Putting the unity back into Community'.
That's a good suggestion Lewis. On an EQ3 that kit gives 8x sidereal, which is pretty slow, but it as you know has clutches so he can make large adjustments manually. I wonder what the gearing on Jeremy's mount would give; if it is significantly higher than an EQ3 it might
stall the motor, although come to think of it, he could use the 2 or 4x speeds and forget the 8x.
I have ordered the following two items (I have a batter box somewhere !!!!)
I know I will be told they are the wrong thing PLEASE if you know, but they are very cheap on Amazon, I hope to try to make one of the two controllers, if it works I will do another
