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Author Topic: Dwell question  (Read 8466 times)

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Offline Hood

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Re: Dwell question
« Reply #10 on: July 18, 2009, 05:40:12 PM »
Ok what you are seeing is the effects of exact stop (G61) What that means is the axis will come to a stop before the next executes, this should be instantaneous but if your acceleration is fairly low (as will be with steppers) then you will see it slowing and then speeding up at the next line.
 You can try with Constant Velocity (G64) what that does is it blends the present line of code with the next line and doesnt slow to a stop like with Exact Stop.
 To make sure you are running Constant Velocity look in your code and if you see a G61 remove it and place a G64 at the start of your code instead.
Hood
Re: Dwell question
« Reply #11 on: July 18, 2009, 09:40:03 PM »
So, I had no G61 or G64 in my code. It started with a G91.1 so I replaced that with a G64 an it's like my machine just doubled in value LOL Beautiful smooth movements :)
Thank you so much.

Now, is it possible to make it put the G64 in the code without havin to do it manually??

Thanks Hood!

PS - G91.1 being removed didn't seem to make any difference (several runs without it now) but for peace of mind does anyone know what 91.1 is?

Offline Hood

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Re: Dwell question
« Reply #12 on: July 19, 2009, 04:11:14 AM »
Your post processor for your CAM should be able to be altered to add the G64, you can also change things on the General Config page so that the default for Mach is Constant Velocity. The problem with relying solely on that however is it can be changed by the code so best to get your CAM to do it if possible.
 G91.1 is Incremental  for IJK mode, you want to keep that in your code as well, no need to remove it, just have the G64 on the line after it.

Hood
Re: Dwell question
« Reply #13 on: July 19, 2009, 11:46:10 AM »
Sweet thanks. I'll go tinker with Lcam....and  put the G91.1 back in...

Who says the Scots and the English don't get along??? hahaha

cheers mate.

Offline Hood

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Re: Dwell question
« Reply #14 on: July 19, 2009, 05:21:21 PM »
Now if only I had known you were English ;D
Hood
Re: Dwell question
« Reply #15 on: July 19, 2009, 05:45:46 PM »
LOL Good thing being in FL got me used to saying "British" (the yanks don't know the difference LOL)
Re: Dwell question
« Reply #16 on: July 19, 2009, 05:46:32 PM »
PS - IF I put the G64 in the code after the G91.1 what "N" should I give it??

Offline Hood

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Re: Dwell question
« Reply #17 on: July 19, 2009, 05:58:30 PM »
Presume you are meaning the line number when you say N? If so put it on the same line as the G91.1 or if you want it on the next line for any reason dont bother with a line number. Mach doesnt care about line numbers they are just there for your convienience, personally I dont like or use them.
Hood
Re: Dwell question
« Reply #18 on: July 24, 2009, 08:15:52 PM »
Cool thanks - being a total newb I have no clue what is ESSENTIAL or MEANINGLESS yet LOL

Offline simpson36

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Re: Dwell question
« Reply #19 on: July 30, 2009, 10:53:29 AM »
Next to the big red reset button on the Mach screen is a smaller button that says G-code. Try that one out.