Messages

1

General Mach Discussion / Re: Radius comp in 4th rotary axis

« 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

2

General Mach Discussion / Re: Radius comp in 4th rotary axis

« 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?

3

General Mach Discussion / Re: Radius comp in 4th rotary axis

« 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                  

4

General Mach Discussion / Re: Radius comp in 4th rotary axis

« on: February 12, 2009, 08:00:11 PM »

I will try it on one tomorrow. I will keep you posted.
Thanks

5

General Mach Discussion / Re: Radius comp in 4th rotary axis

« on: February 12, 2009, 07:00:58 PM »

Hmmm
I will have to give that a try. Below is what I am doing using the multi pass function. See the link to youtube for the cam
that the below prog is making.

(   ******************   )            
(   Feed Cam       )            
( D6      )            
                  
G90                  
G0   Z0               
G1   A20.0      F200         
G1   A0      X   3.25   F100   ( 3.230 final pass )
G1   Z-2.5            F200   
G1   Z-2.650            F10    
M01                  
   Z-2.800            F3   
/   Z   -2.955   F5         
/   Z   -3.060   F5         
                  
G91                  
G1               F60   
                  
                  
                  
N   4   A   20.76         
N   5   A   22.79   X   -0.702   F40
N   7   A   137         F60
N   8   A   143.9   X   0.192   
N   10   A   14.03         
N   11   A   21.52   X   0.51   F40
N   13               
            G90      
            G0 Z0        
            G1A380X3.3F200      
            G0 A360      
            G92 A0      
            M30      
Video of this cam can be seen here.

http://www.youtube.com/watch?v=i9DzEsOPGwo

6

General Mach Discussion / Re: Radius comp in 4th rotary axis

« on: February 11, 2009, 06:29:21 PM »

I do appreciate your efforts.
I would prefere not to go the standard route because my files can be used for reference by most any screw
machine guy.
Even the design layouts for the cams I do are user friendly so no one has to say "how did he do that"?  lol

7

General Mach Discussion / Re: Radius comp in 4th rotary axis

« on: February 11, 2009, 04:30:07 PM »

Hello again
So I take it that this is not just something that I have missed in my setup?

Thats too bad. I wish it was that simple.

If anyone has any thoughts on this, I would really appreciate the help.

8

General Mach Discussion / Re: Radius comp in 4th rotary axis

« on: February 05, 2009, 03:46:55 PM »

See my setup     http://www.scanalex.com/CNC.html    as the table rotates from a smaller diameter to a larger one, you
need to allow for the end mill diameter. Because a screw machine cam is all based from the center point of the cam, the rotational of the degrees needs to make up the diff when the end mill clears the top of the rise and needs to start milling a large radius.  If you don't, then the end mill will cut off the top of the start rise and at the bottom of a rise or drop the end mill
will not truly be in the right position.
Picture the X moving the end mill out to make a bigger diameter as the A rotates. If the rise on the screw machine needs to
be 30° then if you rotate the table 30° and move the x out to the next diameter, the end mill will be leaving too much at the bottom of the rise and may be ok at the top.
Then you need to do the flat or dwell on the cam. If its 5° of dwell or flat diameter, and the A axis rotates it only 5°, the next move to a smaller diameter would cut off part of the top dwell. You would only end up with 3-4° of flat or dwell.

See what I mean?  I hope. lol

9

General Mach Discussion / Radius comp in 4th rotary axis

« on: February 02, 2009, 06:54:57 PM »

Hello all

I don't know if a couple of you remember me or not but I make automatic screw machine flat cams on my BP with Mach3.
I use a rotary table 4Th axis.
Now I would like to use radius comp with the rotary  but with the rotary I use degrees for its movement because that's the way cams are made and
read.
I need to or would like to setup for using radius comp with my 3/16 carbide end mill using the degrees of the rotary as the comp part.
The other axis used is X & of course Z.
The X controls the diameter or radius of the cam and the rotary turns the degrees.

So, can this be done or is it my pipe dream ? Lil

Mach3 has been flawless for several years now. Started out with Mach2.

10

Competitions / Re: ******Guess and win a G100 Grex******

« on: May 23, 2007, 09:27:42 PM »

Well here goes..........  2,873,589 chips.          lol and I bet I am only off by 3%


Scott L Golden.............love Mach 3       & Geck0 s         !!!!!!!!!!!!!!!!!!!!!!!!!!!