KMB-1 Z-Axes Electro-Craft Part #'s

[jtlapp]

Does anyone know the correct Electro-Craft part number for a Hurco KMB-1 Z-Axis. I've have a spare motor with an identical electro-craft part number as the motor which came with my KMB-1, but I think the new motor is too noisy at stand still even after tuning it with the Servomate instructions.

Also does anyone have any suggestions on building a 10V battery box for testing the amps, how much current do I need to supply the the servo amp circuit for manual control, linear or audio taper pots, etc?

Thanks

John T. Lapp

[Al_The_Man]

I previously posted a battery box description but here it is, You need a 10k linear pot and two 9v batteries.
Wire the batteries in series and wire the outer ends of the pot across the two batteries.
The series junction of the batteries will go to drive common, the slider of the pot will go to your ±10vdc drive input.
The current is insignificant.
Probably the motor is not noisy, but the form of the drive current to it.
If a DC motor, test it on an Automotive battery in both directions.
Al.

[jtlapp]

Al,
Many thanks. Off to dive through my treasure pile.

John

[jtlapp]

My KMB1 came to me with a Electro-Craft 0703-02-089 servo on the Z axis. I've replaced it with different Electro-Craft with the same 0703-02-089 part number. The old motor was tripping the Servomate over current indicator and was shorted.

Testing the new motor with a battery I get: 10.7VDC at the motor terminals, 275 RPM and .761VDC on the tach terminals at the motor. If I understand the specs this works out to 2.77VDC per 1000 RPM.

Can this motor work with a KMB1?

[Al_The_Man]

The Motor Ke, voltage constant appears to around 39vdc/1krpm, probably about right.
The Tach looks unusually low?
Check to see if it is linear and same in both directions.
Most tach's are 7v to 20v/1krev.
Al.

[jtlapp]

Al,

+11.56 VDC input 302 RPM 1.03 VDC Tach
-11.56 VDC input 301 RPM 1.02 VDC Tach
+16.16 VDC input 427 RPM 1.45 VDC Tach
-16.16 VDC input 427 RPM 1.45 VDC Tach
+31.7 VDC input 842 RPM 2.85 VDC Tach
-31.7 VDC input 842 RPM 2.85 VDc Tach

[Al_The_Man]

Well it appears to be 4v/1krpm, so it must be an unusually low one?
Al.

[jtlapp]

Al,

Sorry for taking so long to replay, voltage looks low, but the X and Y have are about the same voltage when driven with a power source and the Servomate seems happy with them. Moving the Z motor to the X or Y amp produces approx. results.

I'm going to retrofit this machine with Granite Devices controller and run EMC*. The old control, amps and wiring just too fragile for me. Granite Devices uses encoders instead of the tach. So as long as the bearings, field windings and magnets are fine, it should work

I may sell the AMTS tape emulator, solid state memory, mpu and Servomate.