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Messages - geoff3881

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G-Code, CAD, and CAM discussions / Re: AutoCAD - LazyCAM - G Code
« on: June 28, 2009, 01:42:00 PM »
Apologies - I have now downloaded the files and can now see I need to read the manual before I ask any questions !!



G-Code, CAD, and CAM discussions / Re: AutoCAD - LazyCAM - G Code
« on: June 28, 2009, 01:35:28 PM »
I have AutoCAD 2007 and would therefore like to try your macro. Do I need any special instructions ?
Thanks for your help.


G-Code, CAD, and CAM discussions / AutoCAD - LazyCAM - G Code
« on: June 28, 2009, 03:25:21 AM »
I have been trying to produce G code for a simple con rod profile. 2 arcs and connecting tangential lines. The process used has been :-
Draw outline in AutoCAD - save as dxf file - import via lazy CAM - clean - export G code.
I want to achieve continuous movement around the profile but get a discontinuous movement between arcs and tangential profile.
ie. the end point of say the arc does not coincide with the start point of next part. It moves eg. to the other arc and then the sides.
I modified the file to a polyline as I understood this might help.

Is there a way of forcing the machining sequence other than manually editing it ?

General Mach Discussion / Arc wizard
« on: April 25, 2009, 05:37:17 AM »
I wonder if anyone can help on a minor matter ? I have been using the arc wizard to cut a semi circular recess with a bull nose cutter. Everything is fine and I am working in the XY plane.
I now want to cut in the XZ plane and have edited the G code to do this and it works OK.

Question :- Can you get the arc wizard to generate the G code for other planes directly ?

General Mach Discussion / Re: Mach 3 & Milling Spindle Control.
« on: January 12, 2007, 03:06:48 AM »
Hi Derek,
Thanks for your comments. I contacted Siemens UK and asked the question. They have forwarded details of the Sirius solid state switching device. 3RF2900-OEA18
I am not clear how it would achieve what we want. It is described as follows :- "Analogue control signals are converted into a pulse width modulated digital signal. The strength of the analog input is converted into an ON and OFF swithching time within a fixed duration of 1 sec."
This appears the reverse of what we require. Am I missing something ?



General Mach Discussion / Mach 3 & Milling Spindle Control.
« on: January 09, 2007, 02:25:55 PM »
I am just starting to set up an Emco Mill with Mach 3 software. New stepper motors and drivers are being fitted. I intent to drive the spindle motor with a Siemens Micromaster inverter which can be set for analogue input 0-10V giving control of frequency/speed. The inverter also has a control input for an on/off switch.
I would appreciate advice on how to interface the inverter with the Mach 3 software using the PWM feature to control the spindle speed.

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