![]() ![]() The spindle on my cnc lathe is controlled using the following components: An old Dell Inspiron 8600 Laptop with a Centrino 1.6GHz Processor and 1GB RAM (with no parallel port) and always the latest Version of Mach3 USB Control via a Warp9 Smoothstepper with Plugin Version 0.015meg controlled by Mach3 Cnc4pc C23 Breakout Board directly connected to the Smoothstepper Danfoss FC51 VLT Micro Drive VFD Rototech 0.75KW 3Ø Motor A simple homemade PWM to Analogue DC Voltage Converter (Details covered later) A Spindle Index Pulse generator based on an Optek Technology OPB982T51Z Optocoupler The block diagram I came up with using Open Office Draw shown below was essential during initial planning and design of the cnc lathe electronics. I have no experience with other brands or models although I suspect that the operation of most VFDs is roughly the same. The settings for the VFD refer to a Danfoss FC51 VLT Micro Drive. It also assumes that a Variable Frequency Drive (VFD) is going to be used to control a synchronous 3 phase AC Motor for the spindle motor. It does not cover Step and Direction or simple Relay control of spindle motors. Consideration of Pulse Width Modulation (PWM) control only is covered. ![]() Hopefully this dissertation will make it easier for others. I wanted to pass on to others the experience I gained when I designed and manufactured my cnc lathe. 1 PWM Spindle Control using Mach3 Introduction This document outlines my method of controlling spindle speed on various machines.
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