Messages

191

G-Code, CAD, and CAM discussions / Re: Work offset question G59p#

« on: October 10, 2007, 03:49:01 PM »

Hi Graham,

The first position can be 50 to 150mm off in x&y, not sure about z.

Figures in the workoffset table are 0,0  35,0   70,0   105,0   140,0   140, 35   105,35  70,35  35,35  0,35
These coordinates match the jig pocket coordinates.

I set 0,0,0 on the first workoffset location, but then the coordinates in the tool table for the first location have a strange offset of x52.123, y102,437 for eg and then is a fight to get the first reference correct.

Image of tool path below.
Its a steep learning curve at the moment, thanks for any help you can give.
 Derek

     

192

G-Code, CAD, and CAM discussions / Work offset question G59p#

« on: October 10, 2007, 12:29:09 PM »

Hi everyone,

I am using a 10 up jig to machine parts and have the gcode set up to use offsets and call a subroutine to cut the part at the G59 P# location.

The problem I am having, is when setting up the job, the jig has 10 locations (2 rows of 5). Z is all at the same level.
I set the datum to the lower lefthand location but this sets the remaining 9  positions someway from where they should be ?
Or I can get things to line up but the Z is off.

I'm sure its something dumb I am doing.

G59P1 is my reference and the positions P12 - 20 are the other jig locations.
Should I be using a diferent G59 reference start point?

I use the other work offset locations for another jig, Im having the same problem with that. That program has 10 positions but also 4 tool changes so I have call each of the subroutines 10 times per tool, so I only have 4 tool changes instead of 40.

So the question is how do I reference the job (first location) so the remaining are machined in the correct location and Z.
(now preparing mayself to look like a stupid donkey )

Thanks
Derek.

Code is below.

%
N100 G00 G17 G21 G40 G49 G80 G90
N110 T1 M06 G43 L1 (10MM slot drill)
N132 G00 Z10.S750 M03
N133 G00 X0 Y0
N134 G59 P1
N135 M98 P1
N136 G59 P12
N137 M98 P1
N138 G59 P13
N139 M98 P1
N140 G59 P14
N141 M98 P1
N142 G59 P15
N143 M98 P1
G68 A0 B0 R180 (Rotate back row ref 0,0 and 180 deg)
N144 G59 P16
N145 M98 P1
N146 G59 P17
N147 M98 P1
N148 G59 P18
N149 M98 P1
N150 G59 P19
N151 M98 P1
N152 G59 P20
N153 M98 P1
N153 M05
N154 G59 P1
N155 G00 Z20
N156 G00 X0 Y0
N157 G90 G69 (cancel coordinate rotation)
N158 M30

O1
N4 G00 Z5.
N5 G00 X0. Y2.475 S800 M05
N6 Z3. S875
N7 G01 Z-4. F45. (Set depth of pockets here rough)
N8 X-1.008 Y1.956 F75.
N9 G03 X-2.2 Y0. R2.2
Gcode cut out here to keep message small !
N33 X-2.122 Y7.921
N35 G01 Z-4. F45. (Set depth of pockets here finish)
N36 X-2.728 Y7.256 F75.
Gecode cut out here to keep message small !
N50 G01 Z-3. F150.
N640 G00 Z5.
N645 M99
%

193

Mach4 General Discussion / Re: New people welcome !! Come in here and introduce your self!

« on: March 18, 2007, 01:37:09 PM »

Hi,

Myself and brother Dave, bought a Bridgeport J1 head about 2 yrs ago, fitted it out with steppers on 3 axis 70v 7A drives, (Z knee) and all work a treat.
We changed the original 1HP motor for a 2 hp motor driven by an inverter, driven by Mach3 PWM.
Ball screws on X & Y (metric on x and imp" on y).
X Y 1:1 ratio.
3:1 Z ratio.

Well, success today, our first "real" job.
OK, its only a cutout for a mains IEC connector, but it was a perfect fit! 

We hit the start, Mach started the spindle and after a delay, proceeded to mill out the profile.
When finished, moved to a safe home position and stopped the spindle.
Now we can't wait to see what it can really do.

We are both very pleased and supprised how well the knee axis works, we did wonder if it would move at all! A 7NM stepper, 70v and a 7A drive is more than enough, without counter balance too.

The to do list includes, ....final connection of the coolant solenoids for mist and flood, connect the second inverter to the coolant pump and fit limit and home switches. I'm sure we will go overboard on the design for the brackets for the limits, just because we can. . .now!

Mach is absolutely superb, the forum is great and can't wait to make a mountain of chips.

Best regards,

Derek and Dave.

194

General Mach Discussion / Re: Mach 3 & Milling Spindle Control.

« on: January 12, 2007, 01:19:49 PM »

This appears the reverse of what we require. Am I missing something ?
Regards,
Geoff

Hi Geoff,

I had another look at  the data sheet and you are correct !
Thanks, you have saved me a few quid.
Siemens must have a similar module though, PWM -> V
The schematic of the converter posted below looks "simple enough"
I might have a go at that if no low cost ready built modules available.

Derek.

195

General Mach Discussion / Re: Mach 3 & Milling Spindle Control.

« on: January 10, 2007, 02:28:42 PM »

Hi Geoff,

I also have a Siemens micromaster which is going to drive the  spindle motor on a Bridgeport.

So far I have Mach3 switching the motor on/off and I can see the PWM output on the breakout board.a
I intend to use a PWM to V converter module to IP the analogue in.
Module is a Siemens Siemens Sirrius Konverter 3RF2900-0EA18.

Shame the inverters cant be configured for PWM (or does anyone know different?).

Regards

Derek.