Sherwood's IMS CNC Router with Servo Motors

Problem found was the Y servo motor driver quit working and was not working as well as the X motor driver. After testing the Y motor driver failed completely and the heatsink came off the driver chip on the IC that is the power amplifier for the motor.

Ordered and received new module. Next is install and test. Works..

Step size for X & Y & Z Motors 0.0000703125 inch. This is with the 4X jumper removed. With the 4X jumper installed a one inch move only caused the machine to move .25 inches. With the 4X jumper installed the clocks from the encoder are multiplied four times.

The ClockFace was drawn with Acad version 14 and then exported as a DXF file. Then SuperCamXp was used to import the DXF file and clean up some of the placement of the numbers in the clock face. Then SuperCamXp exported the HPGL file with the .plt extension. This causes the numbers to be converted into lines that can be easily scaled in size.

The orginal interface board supplied with the controller has been wired around and now the servo motor driver boards are driven by a USB CamPod controlled by the SuperCamXp windows application.


Acad program was used to draw the clockface.
Zip File Clockface Drawings

SuperCamXp main screen with HPGL file of the ClockFace loaded.

P - Proportional Gain is how much power is applied to bring the motor back to zero. This feels like the force increases the further off zero. If I Gain is zero the resisting force off center will be constant in proportion to how far the motor is off center.

I - Integral Gain is a running sum of how far off zero it is. This causes the force to build up over time. Moving the motor off zero is resisted by the P Gain where the resisting force is increased as time goes by until maximum force is applied, the rate of the building of the resisting force is set by the I Gain parameter.

D - Derivative Gain is the force that resists quick changes. If P and I Gains are zero you can feel the effect of the D gain by quickly moving the shaft of the motor. With zero D Gain there is no resistance to quick moves, as the D Gain is increased you can feel the resistance to quick moves increase as the D Gain increases.


Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors

Sherwood's IMS CNC Router with Servo Motors


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Published 7/6/2017 4:26:45 PM
Copyright 2016 Dennis Bohlke