Automation Direct Steppers

[obscurity]

Has anyone tried these steppers from Automation Direct?

http://web1.automationdirect.com/adc.../STP-MTR-23079

What were your impressions?

I am in the market for some bipolar steppers and this seemed like a good deal

Thanks,
John W

[DieGuy]

Yep got them on my Taig mill with Xylotex controller. Probably limited to the max voltage potential and speed because of the Xylotex but you can't beat there price for a 3 or 4 axis bipolar controller. I run a 28.5 vdc PSU into the Xylotex and the low speed torque is plenty for the taig. The motors only get luke warm on that setup after running for several hours.

Want more out of them, then use Gekco's on them.

[obscurity]

I am using an L297/298 homebuilt board with computer power supplies in the first iteration of my router table and am looking at other controllers for later once I have gotten things working.

The table is a modified jgro so the 269ozin steppers might be a little powerful but hopfully I won't need to upgrade in later iterations

[wisp]

I'd always thought the automation direct steppers are the exact same ones sold by hobbycnc, xylotex etc... the specs look the same.

Has anyone used the new PV series steppers from Vexta? The PV269 has over 400oz/in in nema23 size, wow.

see attached photo

[ger21]

Has anyone used the new PV series steppers from Vexta? The PV269 has over 400oz/in in nema23 size, wow.

see attached photo

A better deal from Vexta is the 440oz Nema 34, PK-296 something I think. It's cheaper, has a little more torque, and a flatter torque curve with better high speed torque. The PV269's torque drops off very quickly.

[Mariss Freimanis]

Don't be too impressed by holding torque; it's power that gets work done. Power is speed (RPM) times torque. If power is expressed in Watts (746W = 1HP), then:

Watts = RPM * in-oz / 1351

A quick look at the thumbnail speed-torque curve shows 200 in-oz at 400 RPM at 48VDC. Run it thru the equation and you get 59 Watts; kind of OK for a NEMA-23 motor. At 24V (200 in-oz at 200 RPM) it is only 30 Watts of power.

Mariss