what driver board

[smokingbob]

Hey all,

i salvaged some astrosyn 23lm-k202 steppers(nema 23 size) from a old printer, i only have 2 but have sources a 3rd with the same spec. they are 4v/phase and 1.1a/phase. 1.8 deg/step... the table is built and is 20x24". after reading some threads here i see people run the motors at higher voltages and amps!!!I thought hat would blow them, shows how much i know!!!!! The router is for wood. am not too bothered about speed, accuracy is more important for my needs. its only for wood as well and mostly softwood/mdf/plywood. maybe some mahogany for a guitar or 2. Anyway any advice is much appreciated.

Cheers in advance.

rob.

[ger21]

You can't run them at a higher current, but you NEED to run them at higher voltages to get any speed out of them.

[smokingbob]

so a driverboard for a 1.1amp motor and just hook up say a 24v power supply to the motors.???????

[ger21]

Depending on how much speed you need, you can probably supply up to 80V to those motors. But 24V would be an inexpensive starting point.

[smokingbob]

hey ger, really??? i have a 24 and 32v supplies, will hook up the 32v supply so, like i said. speed really dose not bother me too much. these are unipolar 2 if that makes any difference as to what board i use.

[amplexus]

You can find your max voltage using 32 x sqrt of inductance. The printer moters may be a bit light duty for what you want to do, if so check out Keling steppers.
Amplexus Ender

[smokingbob]

hey amp, checked out kelinginc.net. That looks like the better option for me as they supply everything i need. I might look in the uk though as i am in Ireland (shipping costs)but a kit seems the better option. Whats the best option as far as steppers go???as i stated in the first post the table is about 24x20" just for wood, and maybe hardwood now and again??????????? cheers for all the help

[amplexus]

A nema 23 with 400 oz inches or so should be plenty, if you want more they have some nema 34's at 1000 oz in for $119 each. Automarion overstock has some nice rails and bearings rail cut to length and $36 bearings. Thomson rod and bearings are my second choice. Skate bearings belong on skates. Ebay ball screws or acme rod? I like ballscrews but both can be good. Do you want 24 x 20 actual cutting area? if so your table will be bigger. Haydn has a really nice woodworking router he did in steel and aluminum. I think it is one of the best machines on the forums. As you may have noticedfrom my posts I am a big fan of gecko drives. ( read all of Mariss' posts) He has a great tutorial for a 5 microstep build it yourself drive. Keeling has some nice power supplies. don't forget to check motor inductance usually bipolar parallel to get the drive voltage.

[ger21]

One of the Gecko G540 packages from Keling would be your best bet. Most performance for the buck.

[smokingbob]

hey all, thanks for the advice, yeah its a 24x20 cutting area. the table is built and ready to go. Its steel and mdf hybrid, v groove bearings running on the steel angle. No movement on any axis so i am chuffed. anyway i think i have picked a nice package from a supplier in England. thanks for all the help, i must post up a few photos when its complete.