How to set feed speed

[IMK1230]

Hello
So I am new to g code and have been having a quick look and the g code outputted by CAM software and have figured a little of it out. Inasmuch as I can see the G71 for metric and G90 for Absolute Positioning but I can't see how the mill feed rate is set.
Can you help please.
Many thanks IMK

[stevo1]

You have to set this in your programming. What kind of machine and control model are you working with? This is pretty standard on any control. You calculate what speed and feed you want based on what kind of tool you are using and what kind of material you are machining. Let’s say for example you are using a 4flute 1/2” endmill and you want to use 200SF and .004 chip per tooth.

Speed is 200/.5*3.82=1528
Feed is 1528*.004*4(number of flutes)= 24.45

Now you program this into your code when machining.

M3S1528---turn spindle on CW at 1528rpm
G0G90G43H()Z0---set tool height and absolute mode
X()Y()---rapid to position
G1X()F24.45---feed to position at specified feedrate.
…

You can add G94 for feed per minute or G95 for feed per revolution. I think G94 is most common and this is most of the time the machines default code so I never program it.
Stevo

[Al_The_Man]

Originally Posted by IMK1230 but I can't see how the mill feed rate is set. Can you help please. Many thanks IMK

Is It simply the G code for feed?
G01 Xx.x Fxx.xx etc and the manual feedrate overide control.
Remember G01 etc is interpolated move, G00 is point to point (non-interpolated).
And they are Modal commands.
Al.

[FPV_GTp]

Originally Posted by IMK1230 Hello So I am new to g code and have been having a quick look and the g code outputted by CAM software and have figured a little of it out. Inasmuch as I can see the G71 for metric and G90 for Absolute Positioning but I can't see how the mill feed rate is set. Can you help please. Many thanks IMK

Hi , can you cut&paste the g-code program in here ?

cheers