I have a Syil X4 Plus mill and am controlling it with Mach 3. I am using Featurecam to generate tool paths and then a postprocessor I found online to generate G-code. Here si my problem:

I clamped my material in my vise and then set the cutter at 0,0,0, then I zeroed the DRO in Mach 3. When I ran my program, the X axis is offset around .25" It runs fine in my featurecam simulation, but looks offset when I load the program into Mach 3. I ran the program anyway, and sure enough there is an offset. Is thhis a common problem? Do I need to change an offset somewhere in Mach 3? Any other suggestions?

Thanks!

Can you attach the code please.
Hood

% (=============================================)
(Project: 10-22_1_pc_top )
(Compiled: 6-8-2009)
(----------------------------------------------)
(FeatureMILL POST for MACH3 MILL rev1.0 - 03/05/2006)
(MACH3-MILL - rev1.0.CNC)
(NovaLab / CK)
(=============================================)
(====== Tool No 1 = endmill0500:regw)
(====== Tool No 1  diam. = 0.5)
(..... Segment = SIDE1)
(..... Operation = ROUGH1 SIDE)
(=============================================)
N75 M91000 (Lead-in Macro for Smithy Setup)
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N2045 G03 X1.5639 Y-0.2068 I0.1041 J-0.0899 F5.51
N2050 G01 X1.5558 Y-0.2564 F11.03
N2055 X1.7 Y0.
N2060 Z-0.3214
N2065 X1.6618 Y-0.0326
N2070 G03 X1.6379 Y-0.0768 I0.1069 J-0.0864 F5.51
N2075 G02 X1.4 Y-0.25 I-0.2379 J0.0768 F16.54
N2080 G01 X1.2023 F11.03
N2085 G02 X0.9524 Y-0.0075 I0. J0.25 F16.54
N2090 G03 X0.4476 Y-0.0075 I-0.2524 J-0.0075 F5.54
N2095 G02 X0.1977 Y-0.25 I-0.2499 J0.0075 F16.54
N2100 G01 X0. F11.03
N2105 G02 X-0.25 Y0. I0. J0.25 F16.54
N2110 G01 Y0.25 F11.03
N2115 G02 X-0.16 Y0.4421 I0.25 J0. F16.54
N2120 G01 X0.29 Y0.8171 F11.03
N2125 G02 X0.45 Y0.875 I0.16 J-0.1921 F16.54
N2130 G01 X0.95 F11.03
N2135 G02 X1.11 Y0.8171 I0. J-0.25 F16.54
N2140 G01 X1.56 Y0.4421 F11.03
N2145 G02 X1.65 Y0.25 I-0.16 J-0.1921 F16.54
N2150 G01 Y0. F11.03
N2155 G02 X1.5892 Y-0.1634 I-0.25 J0. F16.54
N2160 G03 X1.5639 Y-0.2068 I0.1041 J-0.0899 F5.51
N2165 G01 X1.5558 Y-0.2564 F11.03
N2170 X1.7 Y0.
N2175 Z-0.375
N2180 X1.6618 Y-0.0326
N2185 G03 X1.6379 Y-0.0768 I0.1069 J-0.0864 F5.51
N2190 G02 X1.4 Y-0.25 I-0.2379 J0.0768 F16.54
N2195 G01 X1.2023 F11.03
N2200 G02 X0.9524 Y-0.0075 I0. J0.25 F16.54
N2205 G03 X0.4476 Y-0.0075 I-0.2524 J-0.0075 F5.54
N2210 G02 X0.1977 Y-0.25 I-0.2499 J0.0075 F16.54
N2215 G01 X0. F11.03
N2220 G02 X-0.25 Y0. I0. J0.25 F16.54
N2225 G01 Y0.25 F11.03
N2230 G02 X-0.16 Y0.4421 I0.25 J0. F16.54
N2235 G01 X0.29 Y0.8171 F11.03
N2240 G02 X0.45 Y0.875 I0.16 J-0.1921 F16.54
N2245 G01 X0.95 F11.03
N2250 G02 X1.11 Y0.8171 I0. J-0.25 F16.54
N2255 G01 X1.56 Y0.4421 F11.03
N2260 G02 X1.65 Y0.25 I-0.16 J-0.1921 F16.54
N2265 G01 Y0. F11.03
N2270 G02 X1.5892 Y-0.1634 I-0.25 J0. F16.54
N2275 G03 X1.5639 Y-0.2068 I0.1041 J-0.0899 F5.51
N2280 G01 X1.5558 Y-0.2564 F11.03
N2285 G00 Z1.0
N2290 G91 Z0 M09
N2295 G40 G49 G17 G80 G61 G70 G90 (Inch mode & Exact Stop)
N2300 M91001
N2305 M30
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HI,

I think your problem is your code do not have any cutter compensation.

Your cutter is a .500 endmill, you should insert in your code a G41 or G42 cutter compensation in order to have the edge of the cutter at 0.0.

Just my opinion,

Jeff

Do I insert a line like this?

N82 G42 X0.25

Is that how it works?

Yes, if you go with conventionnal machining (G42) or if you go with climb milling, go with G41

Check out the link or the attached picture, hope this help, Jeff


http://images.google.ca/imgres?imgurl=http://www.home-machine-shop.com/bits/CLIMB_MILLING_THUMB.jpg&imgrefurl=http://www.home-machine-shop.com/bits/index.htm&usg=__5HD1nU_z74D2GOZusUPOzCZTpp0=&h=421&w=450&sz=189&hl=fr&start=9&um=1&tbnid=gknMDciYjDwL4M:&tbnh=119&tbnw=127&prev=/images%3Fq%3Dclimb%2Bmilling%26hl%3Dfr%26sa%3DN%26um%3D1

Cool pic, I like gunsmithing...........that is a neat site.

Should I see a difference in the Mach 3 graphics window or will I see it on the machine?

All I need to do is add that line, I leave the G40's in there?

You seem to have defined the X Y zero position as 0.25inch inside your part, if you are meaning to have the lower left corner of the material as the zero position then you should alter that in your CAM.
Hood

Yes, if you go with conventionnal machining (G42) or if you go with climb milling, go with G41

Check out the link or the attached picture, hope this help, Jeff


http://images.google.ca/imgres?imgurl=http://www.home-machine-shop.com/bits/CLIMB_MILLING_THUMB.jpg&imgrefurl=http://www.home-machine-shop.com/bits/index.htm&usg=__5HD1nU_z74D2GOZusUPOzCZTpp0=&h=421&w=450&sz=189&hl=fr&start=9&um=1&tbnid=gknMDciYjDwL4M:&tbnh=119&tbnw=127&prev=/images%3Fq%3Dclimb%2Bmilling%26hl%3Dfr%26sa%3DN%26um%3D1

Either I'm reading it wrong, or that picture is exactly bass-ackwards in it's indications of climb vs standard milling.  In standard milling, the cutting edge first contacts the work behind the cutter, so you have a thin chip that gets thicker as the tool rotates.  In climb milling, it first contact in front of the cutter, so you have a thick chip that gets thinner as the tool rotates.

Regards,
Ray L.

Ah, I think I see the problem - Are the arrows indicating cutter movement, or workpiece movement?  If they show workpiece movement, then it is correct.

Regards,
Ray L.