advise for motor sizing

[2004sk4]

I have 5 digiplan pk2 packaged stepper drives

the specs in the manual show

full or half step
2a/phase nominal output current
36v drive supply voltage
4,6,or 8 lead motors
1mh min motor inductance
15khz nominal chop freqency

I plan on building a small 3 axis cnc router machine


What motor is the best fit for the drive and use
what is the most holding tq this drive will support. frame size ? etc.
.

thanks

[Sparky_NY]

2amps per phase will limit you to NEMA 23 size steppers. Look at the various stepper ratings for those motors and you will see what ones are 2amps or less. They are going to be fairly low torque motors which will limit the machine size to small.

[Crevice Reamer]

Hi 2004sk4! Nice first post!

Without micro stepping, mid band resonance dampning and speed morphing, your drive performance is very limited. You COULD use the $20 KL17H247-168-4B 62 oz motor. This would power a VERY small router--When or IF it works.

http://kelinginc.net/

My advice to you though, would be to bite the bullet now, before you spend any farther down this path. Sell the present controller and go with a $299 G540. It will power almost ANY size router.

http://kelinginc.net/GeckorDriver.html

CR.

[2004sk4]

thanks for the advise.

I got these 5 digiplan drives free when removing some old equipment.(dumpster bound). They were used to move a 1 heat sensor back and forth on the bottom of a product in five different places. They changed their mind and install 3 sensors instead.

I am looking on ebay at the motors kelingic.net sells
there are 3 PCS NEW NEMA 23 Dual Shaft STEPPER MOTOR 425 OZ-IN


I have a axxus db1v20 cnc parrallel interface card

This is a new hobby to me so i would like to start off with a small router unit.

Eventually when i get familiar to the equipment and processes i would like to use this for some part time income.(any little bit will help)




thanks

[Sparky_NY]

thanks for the advise.

I got these 5 digiplan drives free when removing some old equipment.(dumpster bound). They were used to move a 1 heat sensor back and forth on the bottom of a product in five different places. They changed their mind and install 3 sensors instead.

I am looking on ebay at the motors kelingic.net sells
there are 3 PCS NEW NEMA 23 Dual Shaft STEPPER MOTOR 425 OZ-IN


I have a axxus db1v20 cnc parrallel interface card

This is a new hobby to me so i would like to start off with a small router unit.

Eventually when i get familiar to the equipment and processes i would like to use this for some part time income.(any little bit will help)




thanks

Just watch the current rating of the motors in amps that is does not exceed what your driver board is rated.

[ger21]

The drives regulate the current, not the motor. You can use a 10 amp motor with a 1 amp drive. It won't have much power, but it won't hurt thr drive.

[Sparky_NY]

The drives regulate the current, not the motor. You can use a 10 amp motor with a 1 amp drive. It won't have much power, but it won't hurt thr drive.

Umm yea, but the object is to make a working system. I never said the motor "regulates" the current. Why waste money buying a motor rated beyond what the drive can supply? It won't hurt it but you could have bought a smaller motor, saved money and gotten the same torque.

This is only a 2amp drive, he is going to want all the torque he can get when he buys motors so he is going to want to run as close to the 2A as he can. If he buys motors rated over 2amps, they will produce less than their rated torque with his drives.

[ger21]

I thought you were saying the motor would damage the drive. My mistake.

[2004sk4]

Which motors would you recommend for the maximum torque possible out of a 2a/phase drive.

What would be the most weight in lbs that the drive will be able to move. I would like to build a 80/20 framed 4x4 tabletop cnc router machine.

i have a bosch rotary saw (5 amp 25,000/30,000 rpm) for the cutting head.


thank for all the help

[Crevice Reamer]

Maximum torque from 2A? Get that Keling 425 oz motor and wire it Bipolar Series. (1.2A) You will GET all 425 oz of torque. Of course, you won't get much speed.

CR.

[ger21]

Keep in mind that steppers have their maximum torque when they aren't spinning. Ideally, you want to match your motors to a certain screw lead, to maximize the performance from any given motor. To get the most powerful motor for your drive, find the motor as close to 2 amps as you can, with the lowest inductance

[Sparky_NY]

Keep in mind that steppers have their maximum torque when they aren't spinning. Ideally, you want to match your motors to a certain screw lead, to maximize the performance from any given motor. To get the most powerful motor for your drive, find the motor as close to 2 amps as you can, with the lowest inductance

And... run it around 30-32 volts. Your drive is rated 36V but you don't want to run too close to the limit. The higher the voltage the better the high speed performance of a given motor.

Boy I enjoy spending other peoples money