How big a drive do I need?

[Lauyder]

We have an Older colchester clausing Lathe that We want to convert to a new controler. I like Ajax cnc's controler and all but I want to use the servo motors that I have and They dont have a drive big enough for the Z axis. its a 1200 oz/in motor. a (Glentek 6060-50-02301502) Its a 17.8 amp motor. Now is that the intermittant or continous current? Ajax recommends using amc drives and there are some on ebay for good deals but I need to know how big a one I need.

[Lauyder]

I want to convert my lathe to an ajax controler but my Z axis motor is too big for their drives. they recommend an amc drive and their gpio4 controler package. My problem is I really dont know how big a drive I need. The plate on the motor says its a 17.8 amp. ( its a 1200 in/oz servo motor ) would a 20 amp drive be big enough or do I have to go with the intermittant current?

[cncsnw]

How big is the lathe?

What is its spindle HP (or kW)?

Do you know the Z axis drive ratio (turns of the motor per inch or mm of travel)?

I don't know how AMC rates their drives (whether 20A is a continuous rating or a peak rating), but it is quite possible you will never call on the motor to provide its full rated torque.

For example, 1200 in-oz coupled to a 5mm screw would give you nearly 2400 lb linear thrust, less any mechanical losses. Will you ever really push a tool that hard?

[Lauyder]

Its a 10 hp lathe. and the ratio is close to 8 rpi. amc's drives are rated at peak amps. but I dont know how the motor is rated.

[H500]

Do you have data sheets?

[Al_The_Man]

Something like a 50A8 if 80v or 50A20 if up to 190vdc supply.
Al.

[Larken]

Check out this motor , is your as big ?
http://i90.photobucket.com/albums/k2...Big_motor1.jpg

A Viper 250 should handle your motor ok. It can run up to 200 volts @ 20 amps

www.Viperservo.com

Are you planning on converting to Mach3 ?

Larry K

[cncsnw]

If the motor gives you 1200 oz-in (75 in-lb) on 17.8A, then you can probably get by with a 20A drive. Does the motor data list rated voltage and RPM, and/or a torque constant (oz-in per amp)?

[Lauyder]

Okay the information on the motor is this. I have no idea what most of it means.

Model 6060-50-02301501

torque in/oz 1200

cur-A 17.8

Res-ohms 0.80

IND-MH 1.0

BEMF-V/1000 rpm 50

Max rpm 2500

Tach-V/1000 7

JA-LB-IN-Sec2 .053

Hope you can make sense of it. and thanks in advance

[Al_The_Man]

The maximum motor voltage is 125vdc so a 50A20 should cover it, AMC list continuous amps and maximum peak amperage.
The 50A20 is 25A cont. and 50a peak.
Most modern drives do not use the tach feedback.
Al.

[Lauyder]

[ Are you planning on converting to Mach3 ? ]



Yes It seems like everything in my price range uses that anyway