Hi Tom,
Still thinking of (possibly crazy) uses for astroEQ. One idea I had was a high ratio harmonic gear head on a .9 degree stepper (or higher if there is a bipolar one available. All the 1000 step steppers I've seen require a custom driver (which obviously could be interfaced with astroEQ with the right changes)
there are a wealth of harmonic drives on ebay. Recently I saw this one which had a 260:1 reduction ratio. Mechanical parts aside, it appears as if one could use a 400 step stepper at 32 microsteps and get over 5 degrees a second at .38 arcsec per step.
I have been putting in as follows:
stepper degrees: .9
microsteps 32
gearbox ratio 260:1
worm ratio 1:1
Is this making sense? I didn't use your configuration program because I have to have an astroeq or arduino connected (any way to make it have a dummy board attached for this spec-ing out purpose?) but rather I put the variables into onstep.xls which I found at stellarjourney.com (a very similar project but without eqmod compatiblity). I've in the past put in these variables into your configuration program before though and gotten similar results.
So the questions are:
1. Am I crazy?
2. Is there a way to use the config program without an astroEQ attached just to use the calculations?
3. Can the worm ratio be 1:1 or does this break something? I'm assuming in the end your software looks at a total reduction.
4. is a way for the layman to tell how fast it will go (*sidereal) without stalling the motor or missing steps? (the onstep.xls file does provide a maximum slew rate as part of the calculation, but it is based on interrupt rate and I have no idea what that means in this context.
5. Trying to get up to 1000 steps to improve resolution requires different drivers. Oriental motor sells 1000 step steppers and these controllers:
http://www.orientalmotor.com/products/pdfs/2012-2013/A/usa_st_crk.pdfinterfacing with a controller like this would allow for higher spec motors. Just wondering if you would ever consider (even for hire) to swap out the driver components/firmware that would allow this type of controller? Or will this project always stay with the easystep type drivers.
Refer back to question 1 if need be.
Thanks! just thinking outside the box. In my mind the directly drive harmonic drive would be most interesting way to go on a custom designed mount. Minimum of machining to be done..