Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: sunmix on December 15, 2009, 09:13:04 AM

Title: How to get rid of the THUMP during E-Stopping a G-Code Cycle.
Post by: sunmix on December 15, 2009, 09:13:04 AM

I'm sure many of you have experience this, during a g-code cycle process, be it Plasma, Router, Laser, Mill, or anything, at one point of time the CNC may face into accidental danger, and you may need to E-Stop Mach3.

I'm using steppers for plasma cutting, and everytime I e-stop, a thump at all 3 axis immediately brakes, and when i want to perform a recut, most probably I will not be at the exact stop of where I would like to continue or restart the cutting at.

Any ideas to remove the sudden shock-stop at my motor? thanks.

Charles

Title: Re: How to get rid of the THUMP during E-Stopping a G-Code Cycle.
Post by: M250cnc on December 15, 2009, 09:42:04 AM

Try Feed Hold

You can then have a look and then hit CYCLE to continue

Phil

Title: Re: How to get rid of the THUMP during E-Stopping a G-Code Cycle.
Post by: Overloaded on December 15, 2009, 09:43:14 AM

If you do not require an immediate stop, use the Feed Hold instead.
If it is an EMERGENCY !!!!!, then Mach will treat it as such and stop at all cost....loosing steps or possibly even doing damage to the machine if done repeatedly. After all, it IS an emergency...right ?

Title: Re: How to get rid of the THUMP during E-Stopping a G-Code Cycle.
Post by: sunmix on December 31, 2009, 10:52:08 PM

Because feed hold cant stop instantly... What I mean is: When I press Feed Hold, it doesn't pause immediately, instead it will run abit more of the G-code before it stops 100%.

Title: Re: How to get rid of the THUMP during E-Stopping a G-Code Cycle.
Post by: ger21 on December 31, 2009, 11:21:58 PM

In General Config, Change "No FRO on Queue".

Also, what version of mach3 do you use? I think this was changed in recent versions??

Title: Re: How to get rid of the THUMP during E-Stopping a G-Code Cycle.
Post by: sunmix on January 05, 2010, 03:13:05 AM

if i change No FRO on Queue, i can't control the feedrate overrides. Mach3.042.029

Title: Re: How to get rid of the THUMP during E-Stopping a G-Code Cycle.
Post by: ger21 on January 05, 2010, 09:14:51 AM

You should be able to, but there'll be a delay before it actually changes. I think if you lower the lookahead, it'll decrease the delay.