hole cut quality

[kevinvogl]

Hi i have been reading as much on hole cut quality as I am going to be cutting out a bunch of blind pipe flanges with hole sizes ranging from 5/8"
to 1" I will be cutting them out of metal 1/4" on the small ones and 3/8' to 1/2" on the 12 inch ones with 1" holes. on quarter inch I am getting .035 kerf from top of hole to bottom I know speed and amps and tip and certain settings make a difference any help would be great I have a Samson 5x10 table with plasma cam software and a thermal dynamics cutmaster151. I am newto CNC plas cutting as i have had the table less than a year but have learned a lot in a short amount of time it is a lot to take in at times but I have the table cutting .003 varience on 1" squares in 14 gauge steel and
.004" to .005" on 10 gauge. not to bad on 1/4 I get more kerf and the top is .998 and the bottom is 1.030" so need a little work ther on speed and amps but any help you guys have would be great thanks kevin

[gerryc]

On our plasma with hypertherm 130 amp the critical thing for holes is speed as slow as possible to keep the lag lines as straight as possible and torch height as low as possible .
even then a parallel hole is virtually impossible.