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Author Topic: increase the feed (accelerando)  (Read 2367 times)

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Offline ayhan

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increase the feed (accelerando)
« on: April 16, 2008, 03:08:10 AM »
Hello everyone,

Is there any G code to increase the feed in the same line.?
For example X will go 20mm . will start as F50 while it finish should be reached F100
as accelerando

Thanks
Ayhan 

Offline jimpinder

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Re: increase the feed (accelerando)
« Reply #1 on: April 16, 2008, 03:29:40 AM »
I thought I had replied to this yesterday - I don't think so - but why do you need it.

Mach3 will respond to CSS - Constant surface speed - where you are taking a cut across the face of work on a lathe - and the SPINDLE will accelerate to keep the speed pf the work past the tool constant. I suppose, but have not tried it, that this would also be the same cutting a taper shape. For this, though, the spindle speed must be controlled by Mach3.

The problem is the GCode can only have one instruction (of each type) on a line - so one F instruction is all you can have. You could split the line into say 5 lines, and increse the Feed in each one, if you have Constant Velocity on the effect would not be too bad. - BUT why do you need it.
Not me driving the engine - I'm better looking.

Offline ayhan

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Re: increase the feed (accelerando)
« Reply #2 on: April 16, 2008, 04:18:58 AM »
Dear Jimpinder ,

Thank you for your reply,
I think I will split the line it is better.
I have tig torch instead of spindle. In the begining of work, work piece is cold (no problem) , but later it gets warmer so torch burn the piece. There is also cold wire feeder in the same line.
X-Y-Z (B works as wire feeder) all of them have interpolation.so,so
I will split the feed in 5-10 lines, try again.

Thanks a lot again.
Ayhan Caglar 

 

Offline jimpinder

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Re: increase the feed (accelerando)
« Reply #3 on: April 16, 2008, 01:30:08 PM »
Now I understand - make sure you are set on Constant Velocity for this.

Not me driving the engine - I'm better looking.