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Author Topic: Radius comp in 4th rotary axis  (Read 6619 times)

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Re: Radius comp in 4th rotary axis
« Reply #10 on: February 13, 2009, 05:21:35 PM »

OK, This is very interesting so far.

Now I have selected T1, and in my tool selections put in the dia. of .1875 for my end mill.
See the prog below,
Under "Config" then "Toolpath Config" I have these checked so I can view the actual cam being cut.

Show Lathe Object     X
A Rotations Enabled    X
Axis of Rotations =     Z-Axis

Now when the endmill moves to the first cut @ x.965 the Y does offset to +.094
This is good so far, then as the EM moves up the rise, it gets too close to the corner and then
goes beyond the dia. like it should to allow for the EM dia.
Then it runs over the x1.910 rad and beyond like it should. Then down the return good. then it follows
the x .965 rad back home but goes too far into the first rise. ??

I notice it does not allow for x comp on the x .965 at all but does on the x 1.910 rad.

So its comping the Y ok except the first rise top and only comping the x at the top.
I did up a cam with two diff rise segments and the comp was confusing because of needing G41 then G42 then ....you see what I mean?

SO if you get time, try this out and see if it does the same on yours and what your thoughts are about it.


(   111111   )            
(   CC2 Cam       )            
( D4      )            
                  
G90                  
G0   Z0               
G1   A10.0   Y0   F200
G42         
G1   A0      X   0.965   F100   (  .945 )
G1   Z-2.5            F200   
G1   Z-2.650            F5   
M01                  
   Z-2.800            F5                                       
G91                  
               F200   
                   
N   4   A   35   X   0.945 Y.094   
N   6   A   50 F200
G41         
N   7   A   20   X   -0.9449
G40
N   9   A   255


                  
            G90      
            G0 Z0        
            G1A380X2.5Y0F200      
            G0 A360      
            G92 A0      
            M30      

Thank you                  
Re: Radius comp in 4th rotary axis
« Reply #11 on: February 13, 2009, 05:24:42 PM »
Followup

Why is it that when the EM moves to the first cut, the comp moves the Y to +.094 (which is ok and works) but when
the EM rises up to the top of the cam, the Y ends up at Y-.094 ?
I mean its like Mach3 thinks its on the other side of the cam and not still on the same rise. That makes it cut too deep
into the cam at that point.
Must be because I am using the rotary, huh?

vmax549

*
Re: Radius comp in 4th rotary axis
« Reply #12 on: February 13, 2009, 06:34:59 PM »
YOU might need to read up on the use of tool radius comp. THere is a set proccedure to its use.

ALSO in this particular use you cannot use mixed axis XY moves will in comp AND use the A xis as well. IF you do it will not COMP your moves correctly based on the use of the A AXIS in place of the Y axis. You would need to position the Y axis to account for the initial comp value BEFORE you move the X into position to start the cut.

HOPE that helps, (;-) TP
Re: Radius comp in 4th rotary axis
« Reply #13 on: February 13, 2009, 07:46:49 PM »
Hmmm
I had set it up like the help file said however the tool path started good but cut too deep into the bottom dia. and then
cut off the return part of the cam.
I was dubbing around with trying to get it to act the way I wanted but what you see was the best I could get at the time.
I will have to mess with it some more later.

Thanks