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check your cam program, i use sheetcam and you can switch your cut line from outside offset to inside offset or no offset...
EDD
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I cut up a plate with circles ranging from 1/8" to 1" in 1/8" increments to test out cutting holes with the plasma cutter. The holes came out great except they are all 1/16" larger than what they should be.
Any suggestions on what I am doing wrong?
check your cam program, i use sheetcam and you can switch your cut line from outside offset to inside offset or no offset...
EDD
I am using sheetcam and all the holes are set to inside offset. I have attached my .tap file
What about line length - are they oversized? I'm just guessing here but it sounds as if your number of steps per inch might be off a tad. Also what do you have for a kerf width - have you measured an actual kerf?
It's confusing to say the least. Draw a picture of what needs to happen. Remember the real size of tool kerf does't change. We're going to lie to the program to offset the tool more. With the kerf staying the same and telling sheet cam you're using a larger tool, the hole will get smaller with an inside offset.
What ever size you're calling the kerf, make it .060 larger. Also remember that .060 on the diamerter will only make .030 difference on the radius of the part.
Aj
Also, a ".job" file would tell me more on what you're doing, not the g-code.
We think alike Bill, i was just going to mention that also, i set my kerf at .05 for fine cut consumables and it seems pretty acurate with my machine.
EDD
When i loaded that file it said the kerf setting was .0039
Steps per inch should of been confirmed and put to bed a long time before you get to cutting. There's no doubet, if that isn't right nothing will be the correct size.
Send me your machine info to see if we come up with the same number. It's all math..
How did you come up with .039 for kerf?
Aj
I was just about to ask if maybe the kerf width had something to do with it. I'm sorry for the dumb questions as I am a total newb with this so I'm learning this as I go along...
Steps per inch are correct on my machine. I used the generic plasma setting in sheetcam which used .0039 for the kerf. How do I determine the correct kerf? Is it by the torch tip size being used?
As I cannot attach it to this forum, here is the link to my job file:
http://www.needfulthings.net/cnc/circle_guide.job
cut a line and measure the gap with a caliper..... it's a simple as that... Does't mater about offset or anything... That will give you a starting place.
Aj
you have the kerf listed in sheet cam tool number one as .0039. It should read .039. To many zeros.....
Aj
The simple stuff is the hardest for me... I over look things I shouldn't
Aj
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