Angularity on cuts

[Rampage48]

I currently have a Iplasma table from precision plasma that I have recently built with CandCNC dragon cut with dthc2 controls, and a powermax 45 things have progressed well, just a very steep learing curve but with hours of reading from a lot of topics on here and other websites I have been making a few cuts and everything seems to be going well, except for some angularity issues. Pictures attached to critique anything that I could change or improve I am always willing to learn. Oh and did I mention this is an addictive and expensive hobby......

The setting for the cut were from the powermax 45 were from the book, double checked.

I have a dessicant dryer mounted 25 ft from the compessor and a motorguard filter at the powermax 45, the dessicant dryer and the tank are drained daily and there is some water, checked the motorguard after the cut and no water or moisture that I can see, even checked the filter inside the plasma cutter and no moisture signs.
Torch height offset has been entered into sheetcam only and not doubled up in Mach.
Hand Torch removed drag shield and replaced with 220717 (unshielded deflector)
Tip and electrode where replaced and have about 100 inches on them.
Material 1/16th or 16guage
350ipm
116 volts
Cut Height .06
Pierce Height .15
Kerf .038
Ramp in
Pierce Deley 0


To me it looks like minimul dross and overall I am happy just want to get better angularity before I procced to thicker material $$$$$$.
Let me know if you require any other info or pics

Top of cut.JPG (149.83 KiB) Viewed 1363 times

Top of cut.JPG (149.83 KiB) Viewed 1363 times

Top of cut angularity.JPG (151.13 KiB) Viewed 1363 times

Top of cut angularity.JPG (151.13 KiB) Viewed 1363 times

Bottom of cut.JPG (143.77 KiB) Viewed 1363 times

Bottom of cut.JPG (143.77 KiB) Viewed 1363 times

[Francisco]

Hi!

First, I'd suggest you to change from the deflector to the mechanized shield (220673).

As you are concerned about the angularity of the cut (to me, the parts don't look too bad, but I can't figure the scale of the picture), and from the spatter on the part's face, It seems that your effective cut height and/or your speed are too high.

In 16 ga, and at true .06" cutting height, your parts should show very little angularity. As the plasma jet has a bit of a barrel shape, if you go too high, you get a positive slope kerf,as in your photo. If you go too low, kerf angle will be negative. Too high a cut speed will also create positive slope and spatter.

Hope this helps.

[Stiaan de Villiers]

Hi.

Check your nozzle tip.All the dross is blown in one direction.Either it is the nozzle , or your torch is not plum with the cutting surface.The slightest damage to the nozzle produces bevelled cuts.I also damaged a few nozzles on my first trial cuts.Always try to cut at the lowest current settings for the thickness of material.Best of luck!

[Rampage48]

Should I be using the shield for the mechanized torch 220673 for the hand torch that I am currently using?

[Francisco]

That's correct. The difference between it and the "manual" shield is that the "mechanized" shield's face is machined flat, rather than having the standoff protrusions which you drag against the material when hand cutting.

[Rampage48]

This is a pic of the shield I currently have on the machine I replaced the drag shield that comes with it. It is beveled flat on the front face and the nozzle protrudes throught the hole. Currently using Nozzle 220671.

Hypertherm-Deflector-PMX-45-220717[1].jpg (23.06 KiB) Viewed 1308 times

Hypertherm-Deflector-PMX-45-220717[1].jpg (23.06 KiB) Viewed 1308 times

This is 220673

Just pulled up the torch consumables catalog on the hypertherm website, good info for all machines. Looks like if I am using shield 220717, then I should be using Nozzle 220718 as shown on pg 3 (unshielded consumable) hand torch.

If I am going to use Shield 220673 then I should be using Nozzle 220671.

Jim Colt maybe you can explain if this is true and what the differance is between the 2 Deflectors, and the differance to cut if any?

https://www.hypertherm.com/Xnet/library ... =HYP108928 Consumable catalog****be advised 23MB download if anyone is still on dialup****

[Francisco]

Hi!

This is the configuration you want:



The shielded consummables will give you far better life than the unshielded ones. Unshielded consummables are not well suited to mechanized cutting; they are useful in some manual cutting situations where access to the cut is difficult.

The electrode is the 220669 - I failed big time at cropping the image correctly.