Looking for a replacement stepper motor

[OldHippie62]

Looking for a replacement stepper motor,part number MP-2303: 6.0A, 3.0v,454 oz-in .25 shaft dia. Because we bought our table used, Flashcut and Torchmate won't sell unless we buy software we don't need. Any help will be greatly appreciated. Our machine is similar to the Torchmate X using the TM4 driver software.

[weldguy]

Check out Applied Motion https://www.applied-motion.com/s/ for quality stepper drives. 454oz-in seems high for a NEMA23 but you should be able to get one in the high 300's which will work fine. Who knows maybe they fudge the specs a little so you can't find an exact replacement without buying from them.

[tcaudle]

]The TM tables were never over powered . You cannot get by with a 300. The 454 \s are marginal for higher cut speeds and huger acceleration need bu older software. 23 motors can be had with torque ratings to over 560 oz-in. https://www.amazon.com/Stepper-Motor-57 ... B007QGW4LE Because steppers lose torque with RPM that rating is "holding torque" and goes down at RPM. At roughly 50 - 60% of full RPM of the motor your torque drops off exponentially so not recommend to cut at those speeds , just do rapids. The TM typically uses a 3:1 belt reduction so you get increased torque for acceleration UNTIL you reach the point you have to spin the motor faster where the torque curve drops faster than the torque gain of the belt reduction. If you drop off point in the RPM curve is about 600 RPM that means linear speeds or more than 200 IPM start o really cause problems. It happens stone the less initial torque you have. SO cutting thin stock at 300 + IPM and not stalling motors can get touchy.

Why do you need acceleration? On most older tables you need to try and keep the cut speeds up as high and constant as possible or it allows the toolpath to "deviate". You get rounded corners and even short cuts acorns sharp angles.

so...at half full RPM a 300 oz-in motor has about 150 oz-in of actual torque .

If you replace either of the Y (daul dive gantry) do them both.

The other solution is to go with a controller and csoftware that uses a closed loop THC and real time motion feedback and allows you to define a toolpath tolerance . it then adjusts its speed and acceleration to drive the toolpath accurately . That would cause all kinds of Torch height issues unless you have a way to snese the acual real time feedrates and trigger the THC to not dive.

THEN you can drop back to smaller motors and set accelerations lower and not get torch diving.

[weldguy]

Wow, I enjoyed reading that. Thanks Tom.