Need Help!- Siemens 840d 4th axis----Any help would be grateful

[nathan.gibson]

Hi all, im new so please be nice.
I am running an ibarmia ZV50 L5000 (x5000mm,y600mm,z900mm) we have a 4th axis fully intergrated on it running parralell to the x axis so the axis is defined as the A axis.
My problem is i have never used a 4th axis before and i am lost.
i wont to move in both X axis and A axis at the same time to make in affect a screw of 221mm pitch, outside dia 250mm insde tread dia 180mm.
My question how do i lock the x and a axis and how do i get the a axis to do 1 revalution for 221mm of x movement??????????

the machine is running siemens 840d not sure which version but the machine is brand new so i am guessing the seimens bit is also new

[Switcher]

My question how do i lock the x and a axis and how do i get the a axis to do 1 revalution for 221mm of x movement??????????

I run a 5-axis with Siemens 840D, I don't have any idea how your machine is setup, but the way I would do this is below.

This assumes you are starting at the face of the part (221.0 mm) so the face of the part is X=0.0, & working your way toward the chuck is in the negative direction, the A-axis 0.0 is the center of the A-axis chuck/collet, & that you allow room to keep the tool from crashing into the face of the part & the chuck.

When working with the A-axis & X-axis in the same line of g-code the machine goes by the rotational axis (A-axis) for it's Feed value (F=0.1), run low values on the feed or it will look like the machine is trying to cut in Rapid motions.

This is only an example:

G91 G01 Z=90.0 G01 X=-221.0 A=360.0 F=0.1 G90

Same code as above with comments:

G91 ;This puts the machine into Incremental moves G01 Z=90.0 ;This is 1/2 the diam. of the material (bottom of the thread) G01 X=-221.0 A=360.0 F=0.1 ;This will move the X-axis in the negative direction -221.0 mm, & also at the same time rotate the A-axis 360.0 deg. G90 ;This will put the machine back in Absolute mode

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[nathan.gibson]

Cheers Switcher your programme worked fine obvious now i have got it working. i was trying to only do 1 pitch so didnt see the need to use a G91 this was the only differance between our programmes. cheers for the help its much appreciated