Re: [CAD_CAM_EDM_DRO] Nema 42 stepper with 5/8 shaft

Keith Clark <mail@...> wrote:Looking for a source to purchase three Nema 42 stepper motors with
5/8 shaft and max 7 amp current draw to drive with Gecko drivers.

thanks
Keith clark



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Hi Keith,

Let me save you some additional problems, Forget the stepper motors and go with DC brush type servos. About 30 lb/in for X and Y and 40 lb/in for Z if you are driving the knee and Gecko 320's controlling them. Nema 42 steppers and servos have the same mounting dimensions. I went thru the same thing with an old bandit controller and the steppers are not the way to go. The problem is finding an adequate stepper drive.

Look for Nema 42 "BRUSH TYPE DC SERVOS" you can find them on ebay relatively cheap. They should be in the 100 volt range. They are usually rated volts per K rpm, which means if they are 40/krpm and the rpm is 2500 they are 100 volt motors. The Gecko 320's are rated for 80 volts and 20 amps max. You can run large DC servos at less voltage sacrificing speed but not torque providing you have an adequate power supply. The servos operating amperage should not exceed the 20 amp limit of the drive, The peak amp or stall current undoubtedly will exceed 20 amps however, installing a fuse on the drive will alleviate any surge problems and they would only occur in the event of a crash or absence of servo ramping in the software.

I have a Bridgeport set up this way and use it daily and after one year of operation I have had not one problem with it. I have the rapids set at 100/in per minute and it all performs flawlessly. If you would like further info including pics of my machine E-mail me at rogersmach@...



Ron


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