Messages

2291

General Mach Discussion / Re: Nesting Subroutines?

« on: January 01, 2007, 05:05:53 PM »

Should work like this

Graham.


(#1001 = X Axis)
(#1002 = A Axis)
(#1003 = A Axis Increment)

#1001=0
#1002=22.5
#1003=22.5
M98 P1002 L9
M30

O1002
M98 P1001 L8
#1001=[#1001+.333]
#1003=[#1003+20]
M99

O1001
g0 x#1001 A#1003
G73 z-.04 r.0 q.02 f3
#1002=[#1003+45]
M99

2292

General Mach Discussion / Re: Setting different zero.

« on: December 31, 2006, 04:48:37 AM »

The other way is to program all your Z axis moves from the top of the table e.g. all Z moves are plus.

Graham.

2293

General Mach Discussion / Re: steps and lead screws

« on: December 31, 2006, 04:38:16 AM »

Hi Terry,

thats not easy to do as everybody's setup is different.

Try setting the velocity at 500, acceleration at 100 for a start.

Then run the roadrunner and see how it looks and sounds,  at these settings you should hear the motors ramp up and down quite a bit.

Keep increasing the velocity by about 50 at a time until it starts to stall, then back it off by 50.

Then try dropping the acceleration 5 at a time until you get stalling, then up it again.

I am afraid its all suck it and see with motor tuning.

Graham.

2294

General Mach Discussion / Re: steps and lead screws

« on: December 30, 2006, 05:11:06 PM »

Hi Terry,

standard V threads will work, they are not the most accurate but they should repeat.

The type of thread used will not cause you to loose steps, but the backlash may be a problem.

Have you checked the backlash?

If you slow down the velocity and increased the acceleration time do you still have the same problem?

Graham.

2295

Tangent Corner / Re: Whats that car?

« on: December 30, 2006, 04:56:43 PM »

Sorry folks I had forgotten about this, I will post some pics very soon.

Graham.

2296

Show"N"Tell ( Your Machines) / Re: Waynes Leadwell VMC Retrofit

« on: December 26, 2006, 12:20:45 PM »

Hi Wayne,

this thread may help in your quest for a simple spindle index mechanism :-

Graham.

http://www.machsupport.com/forum/index.php?topic=1942.0

2297

General Mach Discussion / Re: My first interpolation circular

« on: December 26, 2006, 06:44:48 AM »

This is how to drill the holes :-

O0001 (drill 6 holes on a 30 pcr)

G21 G40 G00 G17 G80

N1 (DRILL 10 DIA HOLES)
T1 M6 (select tool)
G00 G90 G43 X30. Y0 Z25. H1 S750 M3 (move to first hole & start spindle)
G81 Z- 10. R2. F100. (select drilling cycle & drill 10 deep)
X15. Y-25.98 (second hole)
X-15.
X-30. Y0
X-15. Y25.98
X15.
G80 (cancel drill cycle)
G00 Z100. (rapid clear)
M30 (program end)

If you want the outside profile then we need to know the details of the size of the flat.

Graham.

2298

G-Code, CAD, and CAM discussions / Re: g92 Proper Use Of with M98, M99 ?

« on: December 24, 2006, 09:30:15 PM »

Hi Chip,

I have just played about with the program and it is looking like its Machs drawing of the run path that is at fault, if you run the program offline and watch the figures in the machine dro's the offsets are being applied and canceled as they should be but the screen is drawn with the local dro figures without the offsets.

Try the included program.

Graham.

2299

G-Code, CAD, and CAM discussions / Re: g92 Proper Use Of with M98, M99 ?

« on: December 24, 2006, 08:14:10 PM »

Hi Chip,

I don't think you can use G92 like this, G92 sets a datum at the current point when you use X0 Y0 Z0 but it has no way to go back to the original start point.

G52 X1. Y1. Z1. is a datum shift by the amount in X,Y,Z, if the values are ZERO it is shift cancel.

When Mach runs the program to generate the path it may be setting the datums and because its a G92 it can't get back to the original datum point so its cutting the bottom part twice because that was the last datum point created by G92.

I hope that makes sense (Its getting late here).

Graham.

2300

G-Code, CAD, and CAM discussions / Re: g92 Proper Use Of with M98, M99 ?

« on: December 24, 2006, 07:45:12 PM »

Hi Chip,

Not sure what you mean by its using the bottom object twice

Graham.