Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: terry1956 on September 16, 2016, 03:42:03 PM
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Hi chaps.I have a problem.my mill cuts find.on checking the movement of the tool using test g code and also the mach software,all is ok. The mill is set for mm. I made a simple square design using v carve.but when using the g code.the mill cuts far to large.both the mill and the g code is set to mm.
Can anyone help me out here.
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how much too big? like 10 times?
I suppose you have tuned your machine?
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Hi.yes the machine is tuned. Parts come out around 150% larger
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is it all the same for all axis?
I am asking because I get confused sometimes, it goes like this
open your tape measure and pull it out for 1/2 a meter and it says 50 but its not 50mm its 500mm,
my guts say check your dimensions in the drawing programme
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Another thought is; what post processor are you using in Vcarve?
olf20 / Bob
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hi, I posted the code using Mach2/3 ATC Arcs (mm)(*txt) I have know idea what is going wrong here.
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The answer is right in the g-code. Is the code it producing the same size as the part you drew? Have you put a tool diameter in v-carve and are you cutting inside or outside of a profile?
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h. I ran the g code in an editor before posting to the machine. the cuts are inside and yes I did input tool diameter into vcarve. could it be the way that mach is reading the g code ????
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your not giving enough info for us to make any judgement!!!!
Saying it doesnt work is not enough!
Please tell us in detail what calibrating you have done. :)
have you looked at utube for help?
try looking at this video please https://www.youtube.com/watch?v=LRagjLewSJg
sorry if I come across strongly but unless we have decent info we are just guessing
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Hi. I have used the mach 3 software to scale the stepper motors, and they move the correct distance on each axis. I have reduced the motor accelerate, I have checked that the mach 3 is in the mm setting.i have made sure that the correct ccutting tool dimensions are bring used.
I have used the road runner demo and it cuts correctly. But when I try to cut with the vcarve g code, the machine trys to cut to large a work and I need to end the process as the machine runs off the bed.
I have ulso used Cam editor to read the g code produced by vcarve and the diameters come out correctly.
And you are not coming on to strong, I am glad of the help.
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fine :)
Did you follow the video, and used a measuring stick on the tip of a vbit? this is important!
dont forget "50 on your tape measure is 500mm"
if you did follow this video
then its the problem is in v-carve, make sure that one of the first 20 lines in the finished gcode from V-carve has a G21 command (for mm) (G20 for inches)
the G21 line in my gcode looks like this
N160G00G21G17G90G40G49G80
without the colour red
if its there in the finished gcode then check again the distances again in v-carve
50 on your tape measure is 500mm
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Thanks.Will take a long look and get back