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Old 12-07-2017, 04:17 PM   #91
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I built this and had trouble getting the steps right. In the end I // some of the code so it is closer to steps per degree.

This was an awesome starting point for me just needs more tweaks.
Les


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Old 12-07-2017, 08:21 PM   #92
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Just want to thank you for an awesome write-up. I've been wanting to learn more about stepper motors, and I am also interested in building an indexer, so your post hit every target.


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Old 12-12-2017, 04:19 AM   #93
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Quote:
Originally Posted by kquiggle View Post
Just want to thank you for an awesome write-up. I've been wanting to learn more about stepper motors, and I am also interested in building an indexer, so your post hit every target.


IMG_1180.jpg

Finished my mount the thing works perfectly thanks again for sharing this SWEET!
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Old 12-12-2017, 07:34 PM   #94
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Hi Driller1432,Thanks for the photo.
Alen
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Old 12-15-2017, 07:55 AM   #95
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I have a question,would a 250 watt 12 volt ATX power supply have enough amps to power the electronics package and a nema 23 57BYGH310 stepper?

ATX:

Dell HP-P2507F3B

120v 6a input
5v 22a output
3.3v 18a output
12v 14a output

24.0 kg-cm (333.2 oz-in) 4 Wire NEMA 23 Stepping Motor;

  • Step angle: 1.8°
  • Voltage (V): 8.6
  • Current (A): 2.0
  • Resistance (Ohms): 4.3
  • Inductance (mH): 16.2
  • L0 Dimension (mm): 76
  • L1 Dimension (mm): 21
  • Holding Torque (kg.cm): 24.0


I'm thinking it would, but then again I've made the magic blue smoke more than I care to.


I want to use an ATX power supply because it has the 3.3, 5 and 12 volt rails, and the purple wire that is 5v always on if plugged in, I connect it to a usb and use is as a usb phone charger, when ever I use one of these. I have lots of these lying around cause I pick up discarded computers for them.
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Old 12-15-2017, 09:52 AM   #96
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In my experience, even 24 volts is not enough. Go 48 volt if your controller can handle it!
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Old 12-15-2017, 01:49 PM   #97
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It will work but your torque will drop off dramatically as your rpm goes up. With every step the current in each phase has to go from maximum in one direction to maximum in the other direction. Higher voltages are needed for this to happen quickly. If you’re using an Arduino the pololu drivers are supposedly good up to 2 amps and are rated for 36 volts. They have current limiting so won’t supply any current above their set point. You can adjust it to a lower value if you don’t require full torque. At the higher current levels they do run extremely hot. If you need full torque you’re better off with a separate high voltage driver like Rod suggests.
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Old 12-15-2017, 07:00 PM   #98
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I'm not using pololu drivers, I'm using the stepper driver based on the Toshiba TB6560 chip.

The data sheet says voltages above 24 volt isn't recommended.

The ATX would give me 24 volts across the +12 and -12 volt rails, unless I can't do that with an ATX power supply.
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Old 12-15-2017, 08:44 PM   #99
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Quote:
Originally Posted by clifwst View Post
I'm not using pololu drivers, I'm using the stepper driver based on the Toshiba TB6560 chip.

The data sheet says voltages above 24 volt isn't recommended.

The ATX would give me 24 volts across the +12 and -12 volt rails, unless I can't do that with an ATX power supply.
A couple of problems come to mind

First the -12v typically has a low current rating. I looked at one of mine and the -ve rail is only good for 0.8 amps. That’s not enough to adequately drive your stepper.

The second issue is that the ground of your driver board will be at -12v. The +5 from the supply is now +17 v when referenced to the driver. If you’re using the +5 to power an Arduino or something else connected to the driver then unless the grounds are kept separate you will be shorting out the -12v rail.
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Old 12-15-2017, 11:40 PM   #100
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Hi clifwst.
“would a 250 watt 12 volt ATX power supply have enough amps to power the electronics package and a nema 23 57BYGH310 stepper”

Yes of course it will. The Manufacturer of your stepper rates it to operate at 2amps, 8.6Vdc. Limit the current to 2 amps and it will run all day on the 12 volt output from the AT Supply.

Upping the voltage is preferred IF you are going to be using micro stepping, but if you are planning to use a rotary table I personally don’t see any need to go below quarter step.

Microstepping increases the resolution at the stepper and is advantageous with an indexer with a low mechanical reduction but comes at a cost of a reduction in torque and speed.

https://www.micromo.com/technical-li...-and-realities

If I remember correctly Diller’s rotary table is 90 to 1. Set to quarter step he would be sitting at 72,000 steps per revolution with tons of torque.

I’m using a high torque Nema 17 stepper set to quarter step with a 36 to 1 table ratio. The stepper is running off 12 volts with the current limited to .6 amps. This gives me 28,800 steps per revolution. I’ve cut dozens of gears (and they work) and find myself using it more and more for milling so long as the piece will fit on the little 3 inch table. And yes lite cuts 5 or 10 thou max.

Sorry to any one I may offend but with 80 steps per degree of rotation if it drops a couple through rounding errors I just don’t care. It cost less to build than buying a single dividing plate, I don’t have to turn the crank and it doesn’t lose track of the number of holes.


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