Topics

11

General Mach Discussion / need help with g code and cutter comp issue

« on: November 03, 2008, 01:27:00 PM »

i am trying to mill off a certain amount from the side of the part then adding a 2.5" radius arc into the side.  my x0 and y0 is set at the bottom left corner of the part and the arc center is X-2.18 Y .66, i am removing .231 materail from x prior to cutting the arc.  here is the code...

o1000
t1 m66 (1" end mill)
s600 M03
g00 g90 g55 x-2.0y-1.0
g43 h1 z3.0
g01 z0.0 f6.6
g01 x-1.0 g41 d1 f6.6
g1 x0.385 f6.6
y1.75
g00 x-3.0
y-.600
g1 x.077
y1.75
x-3.0
y-.6
x.1155
y1.75
x-3.0
y-.600
x.154
y1.75
x-3.0
y-.600
x.1925
y1.75
x-3.0
y-.600
x.231
y1.75
x-3.0
y-.600
x.231
y0.0
g03 x.231 y1.13 r2.5
g01 x-3.0 g40
g28 g91 z0 m05
g28 g91 y0 m09
m30

the arc is not cutting on the center of my part, for some reason its off on the Y.

thanks for the help

12

General Mach Discussion / mach won't change tools

« on: October 24, 2008, 09:34:57 AM »

i try entering my tool change as

M6 T4 and M6 T2 etc and it won't change the tool thats called up.  anyone know what going on here?

13

General Mach Discussion / tool and cutter comp issues

« on: October 24, 2008, 07:31:20 AM »

i'm new to mach 3 but not cnc programming and my mill is not doing what i expect it to.  i think i have multiple problems going on and it may be just with how mach interprets what i enter in the code.

1. tool slot number too large?  i am calling up T1.
2. cutter comp moves 1" cutter to some random number?  do you need to call up D1.0 to let cutter comp know what diameter the cutter is or will it pick that up from T1?
3. what info needs to be enterred in the tool table.  (brand new 1" end mill so i know the wear offsets are zero and i have enterred tool height and diameter.  tool height is -15.76 and diameter is 1.0.)
4.i am moving off of 0,0 and trying to step into the part calling up cutter comp.  so i make a move to

T1
G1 x-1.0 y-1.0 F10
g41
g1 x0 y0 F10

now with code i expect the cutter to be at X-.5 and y-.5 am i mistaken?

any help is greatly appreciated.

14

General Mach Discussion / Cutter comp, comps backwards

« on: September 17, 2008, 12:56:22 AM »

i am trying to cut a 4" radius with a .375 end mill, when i set the part up i can offset the work and cut what i need to, in order to get the job done but i don't want to keep working this way.  i am trying to cut a counter clockwise arc with the tool to the left of the cut. i will post the code tomorrow and maybe we can figure this out.

15

General Mach Discussion / m98 help includes arc cut

« on: June 11, 2008, 06:29:11 AM »

what i'm trying to do is move an endmill into position of the first arc cut, the repeat the arc cut 5 times to the finish dimension, while incrementing each successive cut +.050 in the x direction.  basically i want to position the cutter, take one radius cut go back to the home position of the arc cut, move over .050 and then do another arc cut.  then repeat the arc cuts until i'm at the final dimension of the part.  here is a code i started with...

G0 G49 G40  G17 G80 G50 G90
M6 T1(TOOL DIA. 0.375)
G20 (Inch)
M03 S300
M08
G64
G00 G43 H1  Z0.1
g42 X-3.7498 Y-3.0012
G01 Z-1.575 F10
M98 P1 L5
g90
g00 Z0.1
M5 M9
M30

O1
g91
G3 X0 Y3.2704 r5 F5
G1 X0 Y-3.2704
G1 X.050 F10
M99

16

LazyCam (Beta) / text optimization

« on: May 16, 2008, 10:32:46 AM »

i am trying to use Lcam to create multiple line text.  i also need to know if you can set the font size?  i haven't been able to find it in there so i wonder if it exists. also can lcam do text engraving using a 4th axis on a cylinder?

thanks

jerry

17

General Mach Discussion / hooking up limits

« on: May 03, 2008, 05:29:20 PM »

i'm using optical limits as my home and limit switches for my mill.  the switch when triggered sends a +5volt signal to the computer.  however, pins 10, 11,12, 13 have 4.5 volts on them when the optical switches aren't connected.  my optical switches are wired to send 5 volts to the computer to create a trigger event.  i thought that pins 10-13 were input pins?  what am i doing wrong?

18

General Mach Discussion / spindle problem mach3 mill and cnc4pc c6 board

« on: May 01, 2008, 01:55:44 PM »

i finally got my spindle wired with a vfd and 3hp motor.  i went to try it out and after some fiddling got it working.  i can vary the speed and i can go forward and reverse however the spindle doesn't shut off when i program an M5, M2, or M0 command.  it will slow down but the vfd still runs at 12hz.  i don't understand why this isn't shutting down.  i have spindle setup on port 16 for step and port 17 for direction.  i'm not using output 1 and 2 i'm using the spindle setup under the motor connections.  any help is much appreciated.

thanks

jerry