Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: kolias on November 26, 2015, 08:21:28 AM

Title: 4/8 Wires Stepper Motors
Post by: kolias on November 26, 2015, 08:21:28 AM: I’m ready to order the 3 stepper motors for my new hobby cnc (table = 26”x 40”, made with 3/8” aluminum plate, fixed gantry, Bosch Colt router, Gecko G540).

Is it better to get the motors with 4 or 8 leads?
Title: Re: 4/8 Wires Stepper Motors
Post by: ger21 on November 26, 2015, 08:27:46 AM: You're asking the wrong question.

It doesn't matter if the motor has 4 or 8 wires, as long as it's the right motor for your application.

What size motor were you looking at, and what are the specs you're looking at.

Assuming this is a screw driven machine, what is the pitch of the screws?
Title: Re: 4/8 Wires Stepper Motors
Post by: kolias on November 26, 2015, 08:58:18 AM: Sorry Gerry

10mm lead ball screws.

Motor specs: Kelling KL23H276-30-8B, 282oz/in, 3.0A, 2.2mH
or
KL23H276-28-4B, 280oz/in, 2.8A, 3.6mH
Title: Re: 4/8 Wires Stepper Motors
Post by: ger21 on November 26, 2015, 11:05:28 AM: You have the specs wrong on the first one. It's actually 4.2amps and 2.2mH (parallel) or 2.1amps and 8.8mH (series)

If you can afford the extra $20 (total for 3), I'd go with these:
http://www.automationtechnologiesinc.com/products-page/nema-23/nema23-381ozin-3-5a-single-shaft-stepper-motor-kl23h2100-35-4a
Title: Re: 4/8 Wires Stepper Motors
Post by: kolias on November 26, 2015, 05:58:37 PM: No problem Gerry, thanks. The motor is KL23H2100-35-4A but the spec sheet is KL23H2100-35-4B(7946) and I dont know why

Withe the Gecko540 and 3 of these motors which switching power supply would you go for?
KL-201-24, 24V / 8.3A, $36.95
KL-350-48, 48V / 7.3A, $49.95
KL-350-36, 36V / 9.7A, $49.95
Title: Re: 4/8 Wires Stepper Motors
Post by: ger21 on November 26, 2015, 09:03:19 PM: The 48V will give you the most speed, but the motors may run hot.
Title: Re: 4/8 Wires Stepper Motors
Post by: kolias on November 26, 2015, 11:07:23 PM: Thanks Gerry for the help
Title: Re: 4/8 Wires Stepper Motors
Post by: kolias on November 28, 2015, 11:07:51 PM: Hey Gerry

Does it matter if I put a 282 oz.in motor on the Z axis?
http://www.automationtechnologiesinc.com/products-page/nema-23/nema-23-14-single-shaft-with-flat-282-oz-in-2

I thought a 381oz.in motor may be an overkill for the Z axis but I don’t know if it’s a good idea to have different motors on the same machine
Title: Re: 4/8 Wires Stepper Motors
Post by: ger21 on November 29, 2015, 07:38:16 AM: Sure, you can use different motors.
But I would not. Most people find the Z axis on their machine is under powered. The Z axis is fighting against gravity, and often requires much more power than people think.
Title: Re: 4/8 Wires Stepper Motors
Post by: kolias on November 29, 2015, 07:42:45 AM: Good idea Gerry, thanks
Title: Re: 4/8 Wires Stepper Motors
Post by: RICH on November 29, 2015, 08:01:57 AM: FWIW,

We have used KL23H2100-03-4BM ( think they are 500 in oz and 3.0 A).
Have a look at the motor curve for comparison.

Hmmmm....as long as you can get the velocity and accel you want, having extra power fro the same $ is a plus.
Just my view ...........

RICH
Title: Re: 4/8 Wires Stepper Motors
Post by: kolias on November 29, 2015, 09:26:26 AM: 500 in oz motors sound to me like a “monster” motors RICH, lol

For your application they may be ok but for a hobby use perhaps they are an overkill. Even the 381 oz in which Gerry suggested, although a good idea I still can’t decide if they are the right choice for me.