[rcsimpson]

How can I normalize the feedrates for the 4th axis with those of the the x,y,z axis? I'm thinking I'll have to either change the post processor or run a script on the G code afterwards to do some feedrate translations based on the A axis rotational method (degrees vs. inch movements)

[mfgbydesign]

It's called Inverse Time Feedrate Coding. G93.
There's a G code for ITF instead of Feed Per Minute (G94), and the F word is the inverse of minutes it takes to complete the move.
For example G93 F2.0 will take 1/2 minute to complete the move.
F needs to be in every move.

[ger21]

What control are you using?

[rcsimpson]

Using Mach3 for controller SW.
I've just been adjusting the overall % feedrate offset downward until my other axis don't "trip" from being "rapid-ed" to quickly.

I'd like to solve the problem instead of bandaiding it and get to work.

What control are you using?

[ger21]

I don't have mach3 here, so I'm going from memory.

There's a checkbox in Config >Toolpath, and you need to enter the radius on the settings page.

Note that the value entered for radius is from the center of rotation to Z zero. If you zero your Z on the surface of the cylinder, then enter the radius. If Z zero is center of the cylinder, then enter .001 for the radius.

This should get your feedrates working properly.

[rcsimpson]

I knew about the radius entry on the settings page, but will have to look at the other Config/Toolpath item. Any details would be great!

I don't have mach3 here, so I'm going from memory.

There's a checkbox in Config >Toolpath, and you need to enter the radius on the settings page.

Note that the value entered for radius is from the center of rotation to Z zero. If you zero your Z on the surface of the cylinder, then enter the radius. If Z zero is center of the cylinder, then enter .001 for the radius.

This should get your feedrates working properly.

[ger21]

Something like use feedrate for rotary axis. Should be self explanatory, on the right side near the top.

[BurrMan]

It's a Mach3 setup thing... Go here and search for it in their forum and read a couple reply's....

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