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General Mach Discussion / Mach3 Spindle Speed Problem
« on: October 28, 2008, 08:12:21 PM »
I am using Mach3 V3.041 with a Smooth Stepper in PWM mode. Base Frequency is 1000 (but the problem persists whatever Base Frequency I use).
The problem is very consistent and it doesn’t matter what method of requesting any Spindle Speed. (MDI using M and S commands or from any Spindle Toggle Buttons on any Mach3 Tab).
The problem with the spindle speed is as follows:
Select a speed (say 1000rpm). Spindle Override reads 1000 same as Spindle Speed and SRO reads “00”.
Toggle the spindle on. The actual speed of the spindle always starts at a slightly higher speed than that requested.
Pressing “Reset” under the Spindle Speed Tab always brings the speed back to correct requested speed and subsequent requests for speed changes (via Spindle Override or actual commands for a different speed) from there on are correct and consistent.
It appears that Mach3 is in some form of Spindle Override (approx +10%) when first started. I first noticed this problem a couple of years ago but ignored it and learned to live with it with my mill. However I and building a cnc lathe with a VFD controlled Spindle Motor and want better control over spindle speed.
Also there is another dialogue Tab under the Spindle Speed Tab labeled RPM. It always reads “0” regardless of what I do with Spindle Speed and it does not accept any characters typed into it even though it changes background when selected. So I ignore it. What is the purpose of this “RPM” Box and should it indicate something?
Regards
Chrisjh
The problem is very consistent and it doesn’t matter what method of requesting any Spindle Speed. (MDI using M and S commands or from any Spindle Toggle Buttons on any Mach3 Tab).
The problem with the spindle speed is as follows:
Select a speed (say 1000rpm). Spindle Override reads 1000 same as Spindle Speed and SRO reads “00”.
Toggle the spindle on. The actual speed of the spindle always starts at a slightly higher speed than that requested.
Pressing “Reset” under the Spindle Speed Tab always brings the speed back to correct requested speed and subsequent requests for speed changes (via Spindle Override or actual commands for a different speed) from there on are correct and consistent.
It appears that Mach3 is in some form of Spindle Override (approx +10%) when first started. I first noticed this problem a couple of years ago but ignored it and learned to live with it with my mill. However I and building a cnc lathe with a VFD controlled Spindle Motor and want better control over spindle speed.
Also there is another dialogue Tab under the Spindle Speed Tab labeled RPM. It always reads “0” regardless of what I do with Spindle Speed and it does not accept any characters typed into it even though it changes background when selected. So I ignore it. What is the purpose of this “RPM” Box and should it indicate something?
Regards
Chrisjh