I put the PWNCNC 240v spindle on my new Altmill. I noticed that the spindle is only partially up to speed when the bit hits the wood. My endmill was set to 18000, but the VFD showed 8000 when the bit started carving. Sienci said to set $340 to 100 and $392 to 12. I saw no difference when I did that. If I hit pause right after I hit Start, it takes 3 to 4 seconds to get up to 18000 rpm.
Online, I saw a reference to putting a delay into the post-processor, but I have no idea how to do that. My NWA Shark has a built-in 6 second delay on start, and that works well to get the spindle up to speed before starting the cut.
I see others have had similar problems, but I have not seen a solution. Is there a setting I can change or other easy fix?
The spin-up setting is P0.0.11 if i remember right. That’s default set to 6seconds.
I’ve not experienced the partial speed with my AltMill. But yes… those settings in the gsender should delay it.
I’m not sure how in the post-processor… but the command you’re looking for in gcode is G4 P60000 will wait for one minute.
The P is in milliseconds. Some firmware also accept a S Parameter that has the seconds. So, if supported, G4 S60 would do the same thing.
If you’re using G-Sender you can add M3 S24000
G4 P3 to the program start setting and M5 to the program stop setting. This will give enough of a delay for the spindle to spin up regardless of what RPM you have it set for, This way you don’t need to edit your post processor. You can do this under settings, program events, It will work for all your jobs,
Garry,
Thank you. If I understand, you would have to add this to each program you run.
I found a Garrett Fromme video that leads you through chsnging the Vectric postprocessor for grbl, so that a dwell delay command is added when you save your toolpath. That way I made this one change and every toolpath will now have a delay to allow the spindle to spin up to the set speed.
Thank you for getting back to me. I have several programs that I developed before that I will use your instructions to add a delay. Funny that Sienci and PWN CNC did not have information on this already available. I would think this is a common problem. I was very snxious when my Altmill took off and buried the bit into the wood before the doindke was at speed. Did not break a bit but the altmill starts moving very quickly without a delay command. It was scary. I learn every day with my CNC. Love the altmill, and the PWN 240v water cooled spindle is outstanding. Thank you again.
Tried that. It did not delay the cnc movement . There is something on that command that relates to a delay after a safety door is opened. At least that is the notation in the g sender firmware settings. Did you try it?
It made no difference when I changed that setting. I had to establish a dwell command to cause a 5 second delay, in the vectric postprocessor to solve the problem. Garrett Fromme has a good video on doing that.
Thanks for your help. I am new to this forum. It is very active.