Parts Undersized
Posted: Wed Sep 12, 2018 4:26 am
I have a problem with plasma cut parts being undersized. I believe it may be due to the offset I am selecting in Sheetcam. I normally select inside offset so the lead in and lead out occurs on the scrap material and not the part.
Today I cut a sprocket from 1/4" mild steel that also contained an 8"circle cut out of the middle. The sprocket teeth were too small and the hole in the middle was approximately .100" or 2.5 mm too small also. I was able to salvage the part with some grinding and filing.
Is there an explanation of what inside, outside and no offset does? I couldn't find one. If offset selection isn't the issue, what could it be?
I'm using a Hypertherm Powermax 65 set at 45 amps with 45 amp nozzle. The kerf used in sheetcam for this tool was .066". 137 volts and 48 ipm.
Today I cut a sprocket from 1/4" mild steel that also contained an 8"circle cut out of the middle. The sprocket teeth were too small and the hole in the middle was approximately .100" or 2.5 mm too small also. I was able to salvage the part with some grinding and filing.
Is there an explanation of what inside, outside and no offset does? I couldn't find one. If offset selection isn't the issue, what could it be?
I'm using a Hypertherm Powermax 65 set at 45 amps with 45 amp nozzle. The kerf used in sheetcam for this tool was .066". 137 volts and 48 ipm.