Messages

1891

General Mach Discussion / Re: Strange toolpath

« on: October 15, 2007, 08:21:22 AM »

In what way is the 2nd path wrong?

The only thing I can see wrong with the code is that Mach has no reference to the tool size for the G41's, you need to put a Px.xx or a Dnn

Where x.xx is the tool diameter and nn is a tool number for the offset containing the tool diameter.

If you have programed allowing for the tool size then the G41's are not needed.

Graham.

1892

G-Code, CAD, and CAM discussions / Re: Zero Radius Arc

« on: October 12, 2007, 03:23:27 AM »

Email me your post and I will take a look.

Graham.

1893

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

« on: October 11, 2007, 04:04:52 AM »

Hi Derek,

All work offsets G54 - G59 P1-254) are an X, Y & Z distance from your home position.

Working your way you would have to set every datum (G59 P12 to P20) each time you reset the jig.

Using G52 you only set one datum and the program knows where the others are. You can also correct any errors in the jig positions by juggling the G52 figures.

Not only that, but if you fit home switches and tenon your jig to the table you can go back to that point at any time.

Graham.

1894

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

« on: October 10, 2007, 06:24:26 PM »

Hi Derek,

I think you have misunderstood how the work offsets work.

G59 is the location of your x, y & z datum in relation to zero return.

G59 P12 to P20 is also the location of your 2nd to 10th x, y & z datum in relation to zero return.

So if your first part is at X-100 Y-100 Z-50 your second (G59 P12) part will be at X-135 Y-100 Z-50, your third (G59 P13) part at X-170 Y-100 Z-50 Etc.

If you want to make life a bit easier you can use G52 in your programs.  That way you only set one datum (G54) this will be the X,Y & Z distance from zero return to the datum point on the first part.

The G52 lines are the distance from the datum point on the first part.

Your program would then look like this :-

%
N1 G54
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
N135 M98 P1
N136 G52 X35.
N137 M98 P1
N1137 G52 X0
N138 G52 X70.
N139 M98 P1
N140 G52 X0
N1140 G52 X105.
N141 M98 P1
N142 G52 X0
Etc....

A G52 with a value of 0 (zero) cancels the shift, this must be done before you change to another value. You must also cancel any G52's before a tool change move or change of fixture (G55,G56 etc)

By the way,  Mach3 will not draw it correctly on the screen, don't worry it will cut correctly.

I hope this helps

Graham.

1895

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

« on: October 10, 2007, 02:14:10 PM »

Hi Derek

When you say it is someway off, how far off and in X, or X and Y or what?

What have you got in the work offset table for G59 P12 to 20?

Graham.

1896

General Mach Discussion / Re: Tip Direction in Turn?

« on: October 09, 2007, 04:48:42 AM »

Hi Chip,

On an industrial machine it makes no difference which tool post as everything is rotated around the centre line in the software.

Front tool post tools cut on top, rear tools cut underneath.

As for mach3, not 100% sure as I have not tried it, but I will and report back.

Graham.

1897

General Mach Discussion / Re: Tip Direction in Turn?

« on: October 08, 2007, 06:18:28 PM »

 

Graham.

1898

General Mach Discussion / Re: Tip Direction in Turn?

« on: October 08, 2007, 06:12:20 PM »

By the way, they only have an effect when you use tool comp. Also they can be a pain to use, if you go down a bore with something like :-

G00 X27. Z1.
G01 G41 Z0 F.15
X25. Z-1.
Z-25.
G00 Z1.
G40

Then the tip will smash and scrap the part as you have changed direction the tool jumps to the other side of the line and digs into the bore.

This method is safer.

G00 X27. Z1.
G01 G41 Z0 F.15
X25. Z-1.
Z-25.
X23.
G00 G40 Z1.

Also, NEVER do grooving using tool comp.

Graham.

1899

General Mach Discussion / Re: Tip Direction in Turn?

« on: October 08, 2007, 05:47:24 PM »

I was at work when I saw your post, so time was short.

If you look at the 'V' shape created by the divisions then they look like the point of a tip, the 'V' created by 8 and 3 would be a normal o/d turning tool.

So :-

O/D moving right to left is direction 3
                 left to right                 4
I/D             right to left                 2
                 left to right                 1
O/D using a button tool                 8
I/D     "         "        "                    6

Is that more understandable 

Graham.

1900

General Mach Discussion / Re: Tip Direction in Turn?

« on: October 08, 2007, 07:30:40 AM »

Hi Hood,

this is how the tool tip works.

Graham.