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Newbie with newbie problem
« on: July 13, 2014, 04:43:37 PM »
HI everyone.  I'm Jeff.  I'm a programmer by day and tinkerer by night.
I just bought a CNC after reading up for over a year.  Actually bought the parts to build a 4' x 2' one using chinese ball screws, sliders, nema 23's and all the goodies.  Except the frame!  Don't see a design I love, so I'm going to make my own out of machines aluminum.  I decided it might be a good idea to CNC these parts myself so I could learn on a cheaper machine.  So I bought one of those Ebay CNC6040 deals.  So far so good.  It assembled fine and seems to run well, but I'm having issues with my own design.

Simply enough, I put a piece of wood that is 9" wide and 19" long on the middle of the table.  I tell Vcarve Pro I want a 3" diameter circle in the center.  I send this job off to Mach3.  Load the GCode.  No problem.  I jog my tool to the bottom left corner of the work piece as I indicated in VCarve.  Zero out the Axis and reset the machine coords for this to be "home" - zeroed.  Load the gcode and it makes about a 2 or 3 mm circle, tiny tiny little circle.  I'm sure somewhere the machine thinks it's in mm when I designed it in inches.  I have the native units on Mach3 set to inches from the start.  What am I missing?!

Thanks,
Jeff ???

Offline Hood

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Re: Newbie with newbie problem
« Reply #1 on: July 13, 2014, 04:55:55 PM »
Does your G Code have a G21 in it?
Hood
Re: Newbie with newbie problem
« Reply #2 on: July 13, 2014, 05:07:28 PM »
Not that I can see, GCode listed below.

( Test2 )
( File created: Sunday, July 13, 2014 - 04:32 PM)
( for Mach2/3 from Vectric )
( Material Size)
( X= 482.600, Y= 228.600 ,Z= 19.050)
()
(Toolpaths used in this file:)
(Profile 1)
(Tools used in this file: )
(1 = End Mill {6 mm})
N100G00G21G17G90G40G49G80
N110G71G91.1
N120T1M06
N130 (End Mill {6 mm})
N140G00G43Z25.400H1
N150S12000M03
N160(Toolpath:- Profile 1)
N170()
N180G94
N190X0.000Y0.000F3600.0
N200G00X99.288Y114.300Z12.700
N210G00X99.288Y114.300Z5.080
N220G1X99.288Y114.300Z-2.117F1200.0
N230G3X121.688Y91.900I22.400J0.000F3600.0
N240G3X144.088Y114.300I0.000J22.400
N250G3X121.688Y136.700I-22.400J0.000
N260G3X99.288Y114.300I0.000J-22.400
N270G1X99.288Y114.300Z-4.233F1200.0
N280G3X121.688Y91.900I22.400J0.000F3600.0
N290G3X144.088Y114.300I0.000J22.400
N300G3X121.688Y136.700I-22.400J0.000
N310G3X99.288Y114.300I0.000J-22.400
N320G1X99.288Y114.300Z-6.350F1200.0
N330G3X121.688Y91.900I22.400J0.000F3600.0
N340G3X144.088Y114.300I0.000J22.400
N350G3X121.688Y136.700I-22.400J0.000
N360G3X99.288Y114.300I0.000J-22.400
N370G00X99.288Y114.300Z12.700
N380G00X55.188Y114.300Z12.700
N390G00X55.188Y114.300Z5.080
N400G1X55.188Y114.300Z-2.117F1200.0
N410G2X121.688Y180.800I66.500J0.000F3600.0
N420G2X188.188Y114.300I0.000J-66.500
N430G2X121.688Y47.800I-66.500J0.000
N440G2X55.188Y114.300I0.000J66.500
N450G1X55.188Y114.300Z-4.233F1200.0
N460G2X121.688Y180.800I66.500J0.000F3600.0
N470G2X188.188Y114.300I0.000J-66.500
N480G2X121.688Y47.800I-66.500J0.000
N490G2X55.188Y114.300I0.000J66.500
N500G1X55.188Y114.300Z-6.350F1200.0
N510G2X121.688Y180.800I66.500J0.000F3600.0
N520G2X188.188Y114.300I0.000J-66.500
N530G2X121.688Y47.800I-66.500J0.000
N540G2X55.188Y114.300I0.000J66.500
N550G00X55.188Y114.300Z12.700
N560G00Z25.400
N570G00X0.000Y0.000
N580M09
N590M30
%

Offline Hood

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Re: Newbie with newbie problem
« Reply #3 on: July 13, 2014, 05:09:52 PM »
It does

( Test2 )
( File created: Sunday, July 13, 2014 - 04:32 PM)
( for Mach2/3 from Vectric )
( Material Size)
( X= 482.600, Y= 228.600 ,Z= 19.050)
()
(Toolpaths used in this file:)
(Profile 1)
(Tools used in this file: )
(1 = End Mill {6 mm})
N100G00G21G17G90G40G49G80
N110G71G91.1
N120T1M06
N130 (End Mill {6 mm})
N140G00G43Z25.400H1

That means V Carve has been set up metric. If you change that to G20 it will likely look and run fine.
Hood

Offline Hood

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Re: Newbie with newbie problem
« Reply #4 on: July 13, 2014, 05:11:41 PM »
Actually I see its a 6mm end mill so it might not work out right. You really need to set up V Carve to Imperial units if that is what you wish to work in.
Hood

Offline rdean

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Re: Newbie with newbie problem
« Reply #5 on: July 13, 2014, 05:55:20 PM »
Make sure you are using the correct post processor in V-Carve.  Mach2/3 arcs inches for inches