Irregular Spindle Speed

**HipoPapi** · 01-07-2016

Hello guys and thanks for the input.

We have taken some more images attached below.

Also we have removed the new spindle and re installed the original colombo the CNC came with just to see if we still have this irregular speed issue.

The colombo spindle seems to be spinning fine with just about 3-4 hertz up and down movement on the VFD. But we seem to have a new problem .... when starting a G-code the spindle will spin up to the specified S value in the code, but as soon as the axes start moving the spindle will go to maximum speed. We have reloaded the original XML data into mach3 to have the same settings as when we got the machine but all the same. Any input on this would be greatly appreciated.

Since the colombo isn't usable until they fix the threads on the chuck will have to try and set up the new Chinese spindle.

Please see the wiring pictures attached. If you need any more specific ones please let me know.

Also this current issue with the colombo highlighted some serious dangers that minor software issues can cause. We had incidents before when an apprentice spun the spindle with a tool not intended for that code and well.... the tool was flying across room in pieces as instead of 5000 RPM it was spinning at 18000 RPM. So if someone could explain us how to control the spindle straight from the VFD instead of going through Mach3 that would be great as a backup option for the future. We have a smaller machine on which we control the spindle from the VFD and although it takes a bit more time it might be safer.

We still don't know if we have a star or delta connection but hopefully the attached pictures shed some light on that.

Again thanks for all the help and have a great weekend.

BoX.

The Plug that supply's the whole system: