rotation issues

[ginz]

I am using n/x 2 and building posts in 3.3.0. I have a 5 axis post built and all
looks good except I would like rotaions to come out cleaner. when rotating from
B0.C0. (B is table C is rotary) to say B90. C90. and cutting, If the next tool is
back to B0. C0. the C axis stays at 90. I would like it to come back to C0. the
output is correct u/g adjusts for it by 90deg or whatever the C was at prior to
tool change but I do not like it. Any help would be appreciated.

 

[jelmerra]

ginz

Came accross this problem too. The postprocessor I had to modify used advanced kinematics. I put in reload kinematics. The fifth axis is not reset after finishing an operation for what ever reason.

I encountered a lot of problems after a variational multi axis operation had finished and subsequently a planar operation. In order to get it to work I started switching between 3 axis and 5 axis machine models.

 

[jelmerra]

ginz

Found a perhaps less coarse method than previously described.

You could use MOM_reload_variable do not forget to do both current and previous position.

 

[ginz]

Jelmerra,
Thanks for the tip I will give it a try today.

 

[ginz]

Jelmerra,
Still no return to C0, did you get it to work?

 

[wmalan]

ginz,

Do you always want it to always resolve to C0 at the toolchange? If so, perhaps just include it as part of the toolchange.

Or, do you want the C to rotate to the next position (not nesessarily 0)? If so perhaps hard code it in the operation prior to the toolchange.

--
Bill

 

[jelmerra]

Before the tool change there should be an opportunity for the postprocessor to write the C0 i.e. you will need some kind of template to come along with a fifth axis field.

 

[ginz]

Hi guys, added this to my post at Start of motion and
wolla! problemo gone! Got the tip from ug newsgroup.

#==========================================================
proc PB_CMD_B0_C0
#==========================================================
#

global mom_tool_number_defined
global mom_prev_pos

if {$mom_tool_number_defined == 1} {

set mom_prev_pos(3) 0
set mom_prev_pos(4) 0
MOM_reload_variable -a mom_prev_pos
MOM_output_to_listing_device "KIN INFO -> Reset A and C Axis"

MOM_force Once T M
MOM_do_template tool_change_1
MOM_force Once G_mode G_plane G_motion G_adjust X Y Z fourth_axis fifth_axis F H

}

if {$mom_tool_number_defined != 1} {
MOM_force Once G_mode G_plane G_motion X Y Z fourth_axis fifth_axis F
}
}