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### Author Topic: Travel speed  (Read 13630 times)

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#### DennisF

• 388
##### Re: Travel speed
« Reply #10 on: September 06, 2010, 05:04:55 PM »
Hood
OK i see now so if the G-code calls it out at say feed rate of 80mm then no matter what i do in the FRO the machine well only move at the feed rate set in the g-code is this correct, if this is so then if i change the feed rate in the g-code to say i don't know 300 and then i find this to fast how can i slow it down do i  have to stop the machine and edit the g-code to a lower speed i thought that's what the FRO was for ?

Dennis

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Travel speed
« Reply #11 on: September 06, 2010, 05:09:31 PM »
No, what I meant is the feedrate will never go above the rapid speed, so if your motor tuning has a velocity of 2000mm/min you can never exceed that. If you call a G0 move it wil always be at rapid speed. If you call a G1 it will be at the F you have called. Setting the FRO will increase the feedrate so if you have a G1X100F80 and the FRO is at 300% your feed will be 240.

Hope you understand, I am not making a good job of explaining it LOL
Hood

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Travel speed
« Reply #12 on: September 06, 2010, 05:14:01 PM »
Ok I will try again
If for example your rapid speed (Velocity in motor tuning) was 2000 then,
If you have F40 and 300% FRO you will go 240
If you had a F1000 and FRO 300% the max you would get would be 2000 as that is what your rapid speed is and Mach will not exceed that.

Hood

#### DennisF

• 388
##### Re: Travel speed
« Reply #13 on: September 06, 2010, 05:17:26 PM »
Hood
So if i understand correctly if i increase the velocity this will move the axis faster in the code it has both G00 and G01 i am using a cam package to generate the code file.

Dennis

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Travel speed
« Reply #14 on: September 06, 2010, 05:19:04 PM »
Increasing the Velocity will set your Rapid speed which is the G0, what is your velocity at the moment/
Hood

#### DennisF

• 388
##### Re: Travel speed
« Reply #15 on: September 06, 2010, 05:20:48 PM »
Hood
It's 750

Dennis

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Travel speed
« Reply #16 on: September 06, 2010, 05:23:12 PM »
Ok so F40 at 300% should not be a problem, you should move at 240 with that.

If you command a G0 move from MDI it should move at 750mm/min, does it?
Hood

#### DennisF

• 388
##### Re: Travel speed
« Reply #17 on: September 06, 2010, 05:28:16 PM »
Hood
I am a running a program right now and this is what has led me to the fact that the machine is running so dam slow it's taking forever to cut the file is there a way to increase the speed right now or stop the machine and make a setting change or something.

Dennis

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Travel speed
« Reply #18 on: September 06, 2010, 05:31:41 PM »
Ah ok, now you have me thinking and thats dangerous
Is this file made up of lots of short moves? Are you in G61 (Exact Stop mode)? if yes to these then it could well be that your acceleration is slow so the commanded feedrate is never being reached.
Hood

#### DennisF

• 388
##### Re: Travel speed
« Reply #19 on: September 06, 2010, 05:39:57 PM »
Hood
OK the start code or first line of code in the file reads as follows G00 G49 G40.1 G17 G80 G50 G90 G21 don't see a G61 and yes they are all short moves

Dennis