Newbie- just got new 5 x 10 table

[pocket change]

hello I am confused I am running hyperthem 1250 (80 amp machine) cutting 1/4" steel. I cut some brackets and the edge was beveled. On the bottom it was beveled in, on the top it was beveled out. The holes are also the same way?????????? I checked my air it was at 70. The only way I could get it to cut decent was put voltage (sp) @140 and feedrate @ 45.It still left bevel on the piece. Do I need to turn voltage down on 1250 it is set on 80 now. Also does anyone have kerf settings (10ga-1/2")for this plasma machine. Is anyone around dallas tx area or phone number I can talk with. Work outta town 5 days a week and no access to internet. Thanks for your input

[Mongkol]

1)Do you try moving back the torch in opposite direction?
2) The cause may be worn consumable. Do you try using new nozzle or electrode?
3) Is the torch perpendicular with the surface of material?
The method of setting kerf setting and so on,You can download from hypertherm manual at www.hypertherm.com

Do you have the picture after cutting? If you have ,pls share.

[pocket change]

well I was told to cut outside in CW direction,
this was the first cut on this consumable, also there is no way to adjust torch being at 90* to the table (straight up &down). Is this a slow feedrate and is the amp set correctly on the (sp) or do I need to adjust amps on plasma machine or do I leave it alone (set on 80 amps now) and adjust on (sp) on computer screen. thanks

[Edwardo]

did u get a manuel with your 1250, if not you can download it from www.hypertherm.com it has all the settings listed for different size nozzles and thicknesses of steel for mechanised cutting.

EDD

[CNCTECHNICIAN1]

could be consumable problems like suggested do you have thc on it??

[CNCCajun]

Try this . . . . pierce the center of the "hole", then spiral out counter clockwise . . . .

I have been told this will improve the quality of your holes . . . .

More cutting, better quality . . . .

Steve

[jimcolt]

In order to cut with the best quality with any plasma cutter...you must match the power to the material. If you cut 1/4" at 80 amps....you can cut very fast.....but with more of a bevel on the cut edge. I would suggest that you use the 40 Amp shielded consumables (refer to your manual for the part numbers....or if you don't have the manual you can download one form the www.hypertherm.com site).

Make sure your torch height control is set correctly...the pierce height should be .125", the cut height should be .062", cut speed should be set at optimum of 48 inches per minute, pierce delay time is 1 second, and the arc voltage should be around 149 volts.

I'm not familiar with the operation of your particular machine....just be sure the pierce height is at least 1/8....more is ok. Be sure that the height control indexes down immediately after the pierce delay (1 second) is complete to 1/16". For doing holes under about 1" diameter the arc voltage control (avc) should be frozen at 1/16"....

There may be a little light dross....and about a .005" taper (each side) in your holes.....that is normal with an air plasma.

For less dross....you could go to the 60 Amp consumables....use the following settings:

86 inches per minute, pierce delay .25 seconds, 138 arc volts (adjust if necessary to maintain 1/16" height during steady state cutting), cut height 1/16" and pierce height at least 1/8".

Attached is a picture of what the 40 Amp cuts will look like...use a straight lead in with no lead out. Insert an overburn of about .200" instead of a lead out if your software has the capability to do so on holes.

Jim Colt Hypertherm

[CNCCajun]

I'm still plasma cutter free at this time. My intention is to purchase a Hypertherm 1000 or 1250 as soon as I buy or build my CNC Plasma Table.

Is there any chance that Hypertherm has a program, either a database or a calculation program available that would give you amps vs. speed?

Something other than a chart. A chart will simply tell you a speed and a amp setting suggestion for that"one" combination.

A calc program would let you "what if" 5 more amps, then what would the speed be.

This is assuming that the relationship between amp & speed is a linear one.

Just curious, kind of like my spiral cutting of circles to increase accuracy . .

Thanks
Steve

[jimcolt]

cnccajun,

Everytime we come out with a new product the speeds and thickness increase at a given Amperage.....so if we had some type of a database to calculate plasma speed.....it would have to be changed fairly often.

When I started at Hypertherm in '78 (I was 11)....it took 400 amps to cut 1/2" material. Today we can do it at 30 Amps. Back then we could cut 5/8" steel (with heavy dross) at 85 inches per minute at 550 amps....today we can do 5/8 at 115 inches per minute at 260 Amps...with no dross.

We'll have to stick with charts that go with each unit....at least until we reach the end of the technology!

Jim

[CNCCajun]

Originally Posted by jimcolt cnccajun, Everytime we come out with a new product the speeds and thickness increase at a given Amperage.....so if we had some type of a database to calculate plasma speed.....it would have to be changed fairly often. When I started at Hypertherm in '78 (I was 11)....it took 400 amps to cut 1/2" material. Today we can do it at 30 Amps. Back then we could cut 5/8" steel (with heavy dross) at 85 inches per minute at 550 amps....today we can do 5/8 at 115 inches per minute at 260 Amps...with no dross. We'll have to stick with charts that go with each unit....at least until we reach the end of the technology! Jim

Is the relationship linear?

If so, everyone could build the own computer based chart . . . . with infinite selections . . .

Steve

[slammedxonair]

here post # 41 has been a big help for me http://cnczone.com/forums/showthread.php?t=26227&page=4

[jimcolt]

That post is helpful if you are using an air plasma at 60 Amps.....but each manufacturers torch will be different.

And....plasma systems are available with output power from 12 Amps to 1000 Amps....and an oxygen plasma vs an air plasma, vs a nitrogen plasma, vs an argon/hydrogen plasma witll produce vastly different speeds, arc voltages, amperages at different current levels.

I guess a chart with starting specs for air plasma systems with a few diffeent amperage levels could be done without too much work....but just saying this is a "plasma" chart....would not even be close!

Jim