Centroid CNC4

I would suggest a 7I52S daughtercard as the 7I47 only works with differential encoders
The 7I52S encoder inputs can be set for TTL or differential mode. Only disadvantage of 7I52S is that it requires EMC2 version 2.5 or > (you can download this from the buildbot)

tpwjayson, I looked at your photo of the back of your control. I don't see the secondary BCD board (Page 131). If you look at page 35 item 3 you'll note that the speed is done via the secondary board using BCD values. I suspect the the gcode generator inserted speed values and the control simply ignores them. I really doubt you have a BCD interface as the BOSS originally was manual change.

Does the machine have a VFD that controls the motor? Your speed control board should output either a 0v to 10v value or a resistance value. On most VFD controls you can do both. Spindle directions will likely be controlled by a relay. How are you controlling the spindle at present? A rheostat maybe?

I have no control of the spindle speed right now. Here are some better pics of inside the electrical box on the back of my machine

picasaweb.google.com/1083975133402373892...er=0&feat=directlink

Not sure what is in there, it looks like kind of a mess to me. I am considering buying a VFD and re-wiring all of this, at least the spindle portion.

Any recommendations on VFDs?

tpwjayson wrote:

I have no control of the spindle speed right now. Here are some better pics of inside the electrical box on the back of my machine

picasaweb.google.com/1083975133402373892...er=0&feat=directlink

Not sure what is in there, it looks like kind of a mess to me. I am considering buying a VFD and re-wiring all of this, at least the spindle portion.

Any recommendations on VFDs?

It looks like the two upper relays control the spindle direction, forward or reverse. You should see one or the other of these click when issued an M3 or M4 command.

I have a Square D brand VFD. It came with the machine when I bought it.

Found this link doing a quick google search:
www.driveswarehouse.com/?prop_3=2&prop_6...49&filter=1&x=28&y=8

Looking at above there appears to be three types... not sure which is preferred on a mill.
Volts per Hertz (V/F) Variable Torque
Sensorless Vector Constant Torque
Flux Vector Constant Torque