Greetings,
I have a CNC lathe that is backfeeding approx. 50 volts into the system and it can be measured on another CNC machines incoming power.
What happens is that the CNC lathe is programmed to cut at a constant surface footage as it is facing the end of the part off. This means that the spindle speed increases as the tool moves towards the center of the part. When the tool reaches its programmed point, it moves at a rapid speed (250 in. per minute) to a point away from the face and above the diameter of the part. The spindle speed at the center of the part is about 2000 rpm. The spindle speed when the tool is above the part is 200 rpm. It is when the tool moves from the center of the part to its clearance position, the spindle rapidly decels, and backfeeds the voltage into the lines. I had a drive rebuilt and as we were checking it out under power that it started to buzz when the lathes spindle decelerated. It happened every time. The voltage measured on the new rebuilt drive jumped approx. 50 volts. I don't know who long this has been going on. Has anyone seen this before or know how to fix this problem?
Backfeeding Voltage
Re: Back-feeding Voltage
