Never simple is it! Mach, machine halts

[Shinobiwan]

I use mach to control the spindle now mate so thanks for that. It'll only work with M3 though because I've not wired the VFD for CCW and none of the cutter I have are CCW anyway. I'll have to take a look at the post I'm using and my toolpaths. I probably forgot to set Conventional milling or have the contour profile set in the wrong direction.

Are you saying leave G90.1/G91.1 out the code and set for it within Mach for most reliable results?

[JAZZCNC]

Are you saying leave G90.1/G91.1 out the code and set for it within Mach for most reliable results?

No saying if it was G90.1 leave it and change the I/J mode in general Config to Absolute. Then vise versa if your code uses g91.1 and it' doesn't do what you expect then just change I/J Mode to Incremental.

Also doesn't matter whether using Conventional or climb milling you still want spindle spinning clockwise and M4 spins it Anti clockwise if connected.
Like I say I'd sort it now because one day it could bite if you ever decide to connect spindle for both directions.?

[Shinobiwan]

No saying if it was G90.1 leave it and change the I/J mode in general Config to Absolute. Then vise versa if your code uses g91.1 and it' doesn't do what you expect then just change I/J Mode to Incremental.

Also doesn't matter whether using Conventional or climb milling you still want spindle spinning clockwise and M4 spins it Anti clockwise if connected.
Like I say I'd sort it now because one day it could bite if you ever decide to connect spindle for both directions.?

Ahh I see your point. Its a problem with the post I'm using but I've edited to switch around the M3 and M4 commands and it now works as expected producing M3 instead of M4. Why would you use M4 anyway? I take it there are mills out there that are CCW or is this some special case?

Also how do I set my dwell time? The spindle take a few seconds to get up to speed and Mach is wanting to get going before its ready. Could be problem if its trying to cut whilst still spinning up.

[JAZZCNC]

Also how do I set my dwell time? The spindle take a few seconds to get up to speed and Mach is wanting to get going before its ready. Could be problem if its trying to cut whilst still spinning up.

Ports&pins/spindle setup then General parameters CW delay. . . . OR possibly need to set the ramp up time on the VFD.?

You would want spindle reverse if you was doing rigid tapping and things like that.!

[Shinobiwan]

Ports&pins/spindle setup then General parameters CW delay. . . . OR possibly need to set the ramp up time on the VFD.?

You would want spindle reverse if you was doing rigid tapping and things like that.!

Cheers mate.

Remember its one of those shitty Chinese VFD's so it'd probably blow a capacitor or something if you tried to up the ramp time lol Safer to do it in software.

I have added a line in my post to include an G04 P4 right after the G3 but your way looks better.

[John S]

Cheers mate.


I have added a line in my post to include an G04 P4 right after the G3 .

Been doing this for ages, big CNC has a 7 HP motor on it and it takes a couple of seconds for it to spool up.

[Jonathan]

Cheers mate.

Remember its one of those shitty Chinese VFD's so it'd probably blow a capacitor or something if you tried to up the ramp time lol Safer to do it in software.

I have added a line in my post to include an G04 P4 right after the G3 but your way looks better.

What have you currently got the ramp up/down (PD14,PD15) times set to? I don't remember exactly (will check), but I set mine to no more than a couple of seconds and it's fine. If the acceleration is set too high the DC bus voltage in the VFD will get too high, and the inverter will cut out for protection so it's very unlikely to break anything. Try changing it gradually...
On a machine with gearing etc, like a lathe, it's not sensible to set the ramp up time to something very high, since it would just wearing out the gearbox unnecessarily.

[m_c]

What have you currently got the ramp up/down (PD14,PD15) times set to? I don't remember exactly (will check), but I set mine to no more than a couple of seconds and it's fine. If the acceleration is set too high the DC bus voltage in the VFD will get too high, and the inverter will cut out for protection so it's very unlikely to break anything. Try changing it gradually...
On a machine with gearing etc, like a lathe, it's not sensible to set the ramp up time to something very high, since it would just wearing out the gearbox unnecessarily.

How will accelerating too fast cause the DC bus to go overvoltage?

Also, how is accelerating a geared machine too quickly with a VFD any different from turning the motor on with a switch?

[JAZZCNC]

I have added a line in my post to include an G04 P4 right after the G3 but your way looks better.

Better letting Mach do it because then if for instance you use G-code that hasn't come from your Cam or Post chances are it won't have G4 dwell command, then your pissing about editing the Code. No big deal to do but could be if you forget and delv the cutter into material before up to speed.!!