Messages

91

General Mach Discussion / Re: True 4 axis milling

« on: July 19, 2010, 03:09:06 PM »

G03 and G02 are circular interpolation so they are not straight line:) these moves can only be taken into Plane.. so for a true 3D the interpolation is very difficult... and the softwares are very costly..

92

General Mach Discussion / Re: True 4 axis milling

« on: July 19, 2010, 01:49:51 PM »

the codes are subsequent lines with discrete movement in X/Y and Z-axis so you will get non-linearity out of linear codes..
or just read this thread
http://www.machsupport.com/forum/index.php?action=printpage;topic=14288.0

93

General Mach Discussion / Re: True 4 axis milling

« on: July 19, 2010, 01:35:52 PM »

He showed you simple 4th axis code... The complex true 4th axis code can be generated Via true 4th axis software only;)

94

General Mach Discussion / Re: True 4 axis milling

« on: July 19, 2010, 12:42:03 PM »

Meshcam generates code for the 4th axis, the point is it will not generate code so that all 4 axis can be moving at the same time. Or is this not what you are saying?
Yes..Meshcam generate Gcode for 4th axis..but it is not true 4th axis..You are canabilizing one axis into Rotary motion...
The Gcode for true 4th axis is
g1 x-.655 y.165 z-.060 a15 f5.0
whereas Artcam,Meshcam and Deskproto will generate like
g1 x-.655 y.165 a15 f5.0


The main reason for my question is so I can be a bit ahead with my planning. I have a possible requirement to reproduce small complex casting by milling from solid. As it stands at the moment it would seem Meshcam can cope with this but will I need a more sophisticated Cam package in the future, perhaps for speed or smother finished.

I will probably look at bit closer at 'DeskProto Full'

Depends on the accuracy you needed... Some software only work with STL models and those STL models are not accurate representation of 3D models...  Deskproto or VisualMill will work for you... The VisualMill will be much better as it has Feature machining capabilities..

As I am new to Gcode programming what would a simple piece of Gcode look like that would have all 4 axis moving together in a non linear way; for that matter I don’t think I could do it in 3 axis.

Brian

See my simple 4th axis..its not a true 4th axis , i generate Gcode with Artcam
www.my-woodcarving.blogspot.com

95

General Mach Discussion / Re: True 4 axis milling

« on: July 19, 2010, 10:42:31 AM »

ArtCAM, Deskproto, VisualCAM are not true 4th axis programs.. They always generated gcode for 3-axes...

96

FAQs / Re: Z Axis Double Counting

« on: July 13, 2010, 12:52:29 PM »

I think half the steps/unit setting for the troubled axis

97

General Mach Discussion / Re: Drifting X-axis, making step ladders one side whereas other side is smooth- SOS

« on: July 13, 2010, 12:06:30 PM »

Not yet.. Today i have spent a lot to organize the wiring... I make all the power wiring far away from the controller cards...So that interference zone should be far far away from the Step/Dir pulses....
Tomorrow i will retest the system.. I think this will eliminate the electrical issues too...

The attached picture shows the MOSFET wiring location to the connector.

98

General Mach Discussion / Re: Drifting X-axis, making step ladders one side whereas other side is smooth- SOS

« on: July 13, 2010, 10:19:44 AM »

Today I checked all of the wiring.. The problematic X-axis wiring , i have found short circuit situation.. The 6 wires coming out of Logic MOSFETS... The connect at the Motor power wire was darken due to continuous arcing... I think this may be the problem..

One of the motor coil was getting uneven voltages due to this arcing short circuit.. I don't know the right term... Is this may be Problem?\
Any Thoughts? How can this cause drifting of axis one side?

PS:
I also increased the Pulse width and ran it with 1/2 pulse sherline mode, but the problem was not solved...

Before opening the controller i checked whether the problem in the axis?.. For this i calibrated the X-axis , but every time i got drift toward positive X-axis.. As this was done during the calibration, so no cutting forces and no Quill clearance plays any role here...So the drifting was totally not related to mechanical... Then i swap the Y-axis motor with X-axis, and i always got the results within 0.03mm range for the same axis.. This means i have no mechanical problem..

99

General Mach Discussion / Re: Strange Problem- Never seen before

« on: July 13, 2010, 10:13:13 AM »

Its working now...
G90 G01 Y12

I don't know why this problem happen..I never put G90 before...

100

General Mach Discussion / Re: Strange Problem- Never seen before

« on: July 12, 2010, 12:06:04 PM »

Hi Gerry.. You are right, To run G02 and G03 moves i set the IJ mode to incremental but the Distance mode is Absolute... If i do not change IJ mode to Incremental i get the error in Mach3 for trochoidal tool paths...