Messages

2311

General Mach Discussion / Re: Spindle Index Pulse Problem

« on: November 25, 2012, 08:35:18 AM »

Kevin,

How does Mach use the index pulse during threading cycles? What kind of speed variation can it compensate for? Does it compensate during the cut or only as it is starting each pass?

See Threading on the Lathe-Mach3 Turn write-up in Members Doc's section 2 as it explains in detail.
The more consistant the speed control the better. 30-40 rpm variation is not good. Speed is monitored and an adjustment made based on the previous pass. The monitored speed is very accurate and more so than you may  be able to measure. The DRO should
not change by more than 1 when not threading.

One problem is if the vfd is changing the rpm and Mach is compensating for the rpm then the two are fighting each other.
Thus screwed up threading.
I would suggest you try manualy setting the rpm and see what happens with the scribbing tests.

RICH

2312

General Mach Discussion / Re: Cannot get backlash to work.

« on: November 24, 2012, 08:24:27 PM »

AMorris,
See if this helps"

The  50-50-50 rule which you may want to consider is as follows:

50% - The max velocity is 50% of where your steppers will start to skip
50% - Set the shuttle Wheel setting in configuration to .0050  to .050 ( .5 too slow )
50% - Backlash speed

The Shuttle Wheel Accel is in seconds. How exactly is the" time" applied to the backlash "cycle"? Well I don't really know.
 It's internal to Mach. By observing the difference in how the motor reacts to different settings you will see that it affects the overall time
 it takes for Mach to take up the backlash and at say a value of 5 you will find that over five seconds the handwheel / shaft will turn
 rather slowly. At 0.005 sec its almost instantaneous. In the real slow setting, and say you jog a distance of .1"  you will find there
seems to be almost 3 distinct motor responses in the cycle,....... a small rotation then deceleration...... then backlash taken up
over a time...and then  accel and move to finish the distance.

So to get of flavor of it you need to start slow, observe, listen to see what is happening over an operating range.
Work your way up in settings.

RICH

2313

General Mach Discussion / Re: toolpath is incomplete

« on: November 23, 2012, 07:54:12 AM »

eelsmans,

YOU ARE USING A PIRATED MACH VESION. WE DON'T CONDONE OR "SUPPORT" THAT ACIVITY.
PIRATED VERSIONS WILLL NOT WORK PROPERLY THUS YOU ARE WASTING OUR GOOD WILL AND YOUR TIME ALSO.

YOU WILL RECIEVE NO SUPPORT FROM THIS SITE UNTIL YOU START USING THE DEMO OR PURCHASE THE SOFTWARE.

RICH

2314

General Mach Discussion / Re: CNC 6040 Setup..

« on: November 22, 2012, 07:31:56 AM »

What support is available from China or the supplier if I may ask.
RICH

2315

General Mach Discussion / Re: Z-Axis Repeatability: Small Changes

« on: November 22, 2012, 07:26:34 AM »

Ricahard,
I agree with Terry, reply #3. Trying to maintain axis position / repeatabliy to .01MM ( .0004") requires excellent hardware.
You can have that much backlash even with good components and a properly configured /adjusted machine.
You don't mention what your calculated resolution is and please note that chances are your machine will not achieve calculated resolution
due to many factors.

RICH

2316

General Mach Discussion / Re: Fluorescent Lights and Interference

« on: November 22, 2012, 06:55:20 AM »

Never had a problem running the Sherlines / opto's located on a bench with flourecent lighting located within 42" above the machines.
If I  get a chance I'll check the RF intensity but believe it would be very small and not enough to couple and create problematic noise.
Not the case for a very sensitive reciever though.
RICH

2317

Share Your GCode / Re: G code for edge radius

« on: November 21, 2012, 08:19:10 PM »

Maybe just use a CAM program that provides for it , llike Cambam.
RICH

2318

G-Code, CAD, and CAM discussions / Re: Autocad to g-code measurement problem

« on: November 21, 2012, 06:03:08 AM »

You may want to consider making your owne single line text set. Easily done by just drawing over placed text in CAD and when you draw the text use a min number of arcs for the curved parts. The g code file produced will be very small as compared to exploded text.
RICH

2319

Show"N"Tell ( What you have made with your CNC machine.) / Re: I'm in Hog Heaven

« on: November 17, 2012, 08:18:56 AM »

Pendant looks good. Let me know what you think of the Lindsay Engraver......are ya getting lazy and don't want to chase anymore?
RICH

2320

SmoothStepper USB / Re: Mach3 Not Responding

« on: November 16, 2012, 06:29:02 AM »

This thread should help:
http://www.machsupport.com/forum/index.php/topic,22751.10.html

RICH