I’ve been having good luck with my test cuts over the past few days. I’m testing with 14 gauge mild steel. Initially I was going with 225 IPM at 45 amps. Was accurate within .015 which I feel is pretty good.
I decided to try some slower speeds which I had read about. Went with 80 IPM at 30 amps. Plasma cutter is the Razorweld 45. Here are some screenshots with my settings and the resulting cut.
Still nice clean cuts with slightly more dross on the backside but it seemed to combat the ever so slight taper I was getting. The problem is on 2" x 2" square with a 1" diameter circle, left to right is coming in about 1.980". Top to bottom is dead nuts at 2.000" The circle is plus/minus .004". I’m just wondering why the square is off .020 left to right? Any ideas?
Is that typical to have the taper different from horizontal to vertical edges or can something be done about it? Going by eye, all of the edges look plumb with no visible bevel. I did check the physical torch cut height with feeler gauges and it is spot on at .06 at the beginning of the cut. I’m not currently running the THC as it was giving me errors so maybe that’s something to diagnose next?
Those pictures of the circle were +/- .004 when spot checked. These are cheap calipers that I’ve had forever, not sure how much that plays into it. I’m honestly happy with the cuts. I know it’s not a laser and this is technically a hobby grade tool. I also know that a lot of people get professional grade results with it from what I have been reading. Just seeing if I should move on to testing some thicker material or keep my focus on fine tuning this one. I guess the next step should be testing something larger with more detail and see how that plays out. Just trying to not overthink it like I already am lol.
I think that all depends if you feel you will be making parts that require better accuracy.
That might be a problem on larger parts. Maybe try cutting one that is 2" wide by 20" and see how it comes out.
I think your cuts are very good only one I would chase would be the out of square
225 IPM is fast, I think I cut 14 at 110 at 45A. Maybe I need to do some testing!
I’ve done a few more cuts. Something else I noticed while cutting is the PSI dropping on the Razorweld 45. Compressor is set to max of 140, drops to 90 psi before it kicks on. I have an additional regulator further down the line that is set to 90 psi right before it enters the Razorweld. Now on the Razorweld, it holds 80 psi all the time before cutting. While doing a cut it will drop to 60 or so PSI.
From what I have read on the forum this should be corrected since these cutters come with cheap regulators. I’ve also read that 60 to 65 psi is what you want to be cutting at. So I guess my question is do I bypass that internal regulator anyway just to get that out of the equation even though it is running close to the proper cutting psi?
By pass the internal regulator, it is most likely bad and put one on the back of the plasma cutter to adjust the air pressure. Just went over this with another member. See Razorweld cutting issue(SOLVED)
Yes it was actually your thread @Blaisehudson that got me thinking. I’m not having any of your trouble (yet) but I’d like to get out ahead of it if possible. I tested on some 1/4 mild steel. Got good results with the exception of some little nicks that are inconsistent. So that’s when I started to look at the air pressure. Could also be the consumables. I haven’t changed them yet but should at least give them a look.
