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Messages - Segrest

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G-Code, CAD, and CAM discussions / Re: Circles instead of Arcs ?
« on: August 09, 2013, 12:49:01 PM »
Thanks Gerry,

Changing the IJ setting from Absolute to Inc seems to have solved the problem.


G-Code, CAD, and CAM discussions / Re: Circles instead of Arcs ?
« on: August 09, 2013, 11:56:26 AM »
Here is a copy of my Mach3 mill configuration file and a sample gcode file...


G-Code, CAD, and CAM discussions / Circles instead of Arcs ?
« on: August 09, 2013, 11:54:06 AM »
Hello Everyone,

I am using BobCAD v25 to generate gcode for my Mach3 controlled mill.  Most of my configuration is working well.

But when my gcode generates an arc, the result is a circle bigger than and well beyond the intended boundaries of the part.  The following line is an example of the gcode arcsbeing generated in my BobCAD post (nc) files:

     G03 X1.3285 Y.3853 I.0444 J-.0146

My gcode skills are not evolved enough to tell if this is a problem on the BobCAD or the Mach3 side of my process.

Can anyone point me in the right direction?


PS: I have tried to create this post a couple times now and keep getting errors.  My apologies to the group if this is generating duplicate topics.

General Mach Discussion / Left Hand Threading ???
« on: April 05, 2008, 10:34:54 PM »
Hello Everyone,

I am using Mach3 Turn and have a project in the pipeline that will require left hand threads.

I don't see anything that indicates the existing G76 macro will support this.

Has anyone figured out how to do this?  How?


General Mach Discussion / Re: Turning a Morse taper
« on: March 09, 2008, 07:47:45 AM »
Hello Bill, Jumpinder,

I think Bill is on the right track.  I suspected a NUG error and am glad it is something simple.

Jumpinder's point is sound as well.  Manually coding the final pass is simple enough.  The wizard makes calculating the roughing cuts easy and but I recognize that I can write more efficient code myself.

Thank you both for your responses.  I will give it another whirl later today.


General Mach Discussion / Turning a Morse taper
« on: March 08, 2008, 10:11:18 PM »
Hello Everyone,

Now that I seem to have gotten through some of the basics, I though I would try turning a taper.

What I want to do is turn a Morse #2 taper on the end of a piece of round stock. 

I pulled up my handy machinists reference and it tells me that the rate of taper for Morse #2 is 0.59941 inches per foot.  My handy dandy trig table tells me that the angle for the taper is equal to arc tangent of the rate of taper divided by the length (Arc Tan 0.59941/12) for 2.8596 degrees.

I started up the Mach3 Turn OD Taper Wizard and entered the following parameters:

X End:       0.5
Angle:       2.8596
X Start:     0.8
Z End:       2.3
Z Start:     0.0
Clearance:  0.1

I started the program and it ran without a hitch.

But, my pretty new taper doesn't fit...

I figure that I did something silly, can someone tell me what?


Finished Screens / Re: Quick Threads Wizards
« on: February 26, 2008, 09:13:09 PM »
Hi Scott,

It looks like I pulled down v2 with the non-muted colors.  I'll pull down V3 and try again.

Still haven't figured out the change settings silliness...


Finished Screens / Re: Quick Threads Wizards
« on: February 26, 2008, 09:10:26 PM »
Hi Scott,

I'm just getting started with cnc threading and your new wizard seems like a good starting point.

One dumb question to start with...  How do I change a value on one of the wizard screens?  If I highlight a field, I can change the value, but as soon as I select another field the value reverts to it's default.  I'm doing something silly, please enlighten me...

When I load the wizard the field values are displayed in a yellow font on a bright green background.  Its kind of difficult to read.  Is there an easy way to change this?


General Mach Discussion / Tool Diameter Wear ?
« on: March 17, 2007, 01:43:31 PM »
Hello Everyone,

I am working on a small project on my ShopTask machine using Mach3.  After making several duplicates of the same part I noticed that my end mill wasn't cutting as clean as it had on the first part and that my tollerances were starting to drift out of spec.  I replaced the end mill with one that had been resharpened and the cuts looked much better.  Then is discovered that my parts were really out of tollerance.  For example I milled out a round hole that is supposed to be 1.757 inches in diameter and it only measures 1.744 inches.  I checked several other different dimensions and the results tell me that my end mill is under size by about 0.0065.

When I look at the tool table dialog in Mach3 there is a field named "Diameter Wear".

If I enter a value in the Diameter Wear column for my tool, will it cause Mach3 to correct for my under sized tool?

If this is the case, what value should I put into this field?


General Mach Discussion / Re: Another G-Code Loading Problem
« on: February 28, 2007, 05:54:14 PM »
I have no idea.  The G-Code file was created by processing a DXF drawing through LazyCam.

Bob Segrest

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