George, That is what the simulation shows. We can't get around the inductance of the windings, you can't just turn the pot or set the current and have it violate the basic inductance laws. I think it'

George, Mike, Robert, I've said this before, and I wish someone could confirm my findings. When I was running my set up and trying to get my Losmandy conversion to run faster, what I found was that th

Chad, Very creative! It makes a nice clean professional looking implementation. Kudos! Bob

I use a 10:1 precision planetary on a NEMA17 motor. Adding a planetary will slow down the slew rate, but then everything is a tradeoff anyway. I am not trying to swing at a baseball with my scope, so

Guy, From your video, it sounds like your motors are stalling during guiding. What are your current targets for the motors during slew and guide? With those TB6600, do you even have that selection? As

The last picture is best, BUT you must connect the two ground systems together!!! Put the two supplies next to each other and run a ground between them. Make sure the supplies are isolated!! Keep all

Chad, Sorry, I call you "Chris" several times. Got you confused with someone else. Old man brain fart. Humble apologies. Bob

#diy

Chad, Take the lemons and make lemonaid. You have some nice proven concepts you are embracing, and I think some of the criticism you are getting are people trying to help you avoid pitfalls, although

#diy

Chad, Are you using the 160T as your primary gear, equivalent to a worm/worm wheel combo? Others have done well with a 360:1 and 400step motor and 32 or 64 micro-stepping. There is a company called Av

#diy

From my photography days, I don't think the Majestic was designed for more than 20lbs or so. They were for large 8x10 (max) view cameras. I don't think the gears will handle it (they might strip), and

#diy

Chad, Do you plan on putting all that mount on top of the Majestic head? Bob

#diy

Regarding drive methods, one must also look up Peter Boreland's posts on the Losmandy group. He has achieved a very high degree of smoothness regarding periodic error and high frequency noise in the d

I found these guys to have a small supply of pulleys and a very good supply of GT2 belts in 2mm increments. They have 1/4" bore (6.35mm) and 60T. Some are in 9mm wide, which can still be used with 6mm

There is tremendous resistance to planetary gearboxes (or any gearbox for that matter), vs a 3:1 or 4:1 belt reduction. But if you do decide on a planetary, get a good one. Stepperonline has precision

#superpolaris

Just in case you need to drive something and you need a bit of isolation. IXYS CPC1006N. Bi-directional switch, good for 60V &75ma. 0.5mA to drive the LED. Perfect for interfacing to the switches on t

Peter asked me to post this diagram showing how the "hunting" or closed loop error could cause elongated or double star images. The green ellipses are where the position dwells long enough to burn in

Check the voltage on the enable pin (pin 1 on the driver) during and after a drive (we're not slewing anywhere I suspect). Make sure it is low (~0v) during the drive. Bob

#fysetc

David, I didn't hear an attack, but I do hear someone who is not listening. Khalid is just telling you what you want to design, is already existing. Khalid is, as I am, at a loss to understand what yo

Harkant, regarding your selection. 100:1 is probably way to high. What are the gear reductions in your mount? Do you have a 180 tooth or a 360 tooth main worm wheel? Did you go through Khalid's spread

Barry, What vintage is your G11? The thickness of my main plate is around 0.330. The mount is probably 25 years old. Bob