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There seems to be an itty bitty bit of difference between the marketing blurb on the TA website and the spec sheet. That is, if I understand the meaning of "duty cycle." The TA site says :"CUTMASTER® TRUE Series has been designed with the idea that recommended cut capacity should also be the TRUE cut capacity. The TRUE Cut Series eliminates the concept of having to buy up, purchasing a machine larger than you actually need. With the introduction of the CUTMASTER TRUE Series, a one-half inch recommended capacity machine will cut one-half inch material ALL DAY, EVERY DAY. NO EXCEPTIONS. The all-new THERMAL DYNAMICS® TRUE Series CUTMASTER® 42 is one of the most affordable, highest quality 1/4" ( emphasis added) Here:http://victortechnologies.com/therma...?prodID=1-4200 I don't understand the last phrase after the comma "highest quality 1/4" Maybe it means that the machine's best performance is on 1/4" stock? But What the devil does:"will cut one-half inch material ALL DAY, EVERY DAY. NO EXCEPTIONS."mean when the specifications say it is a 40% duty cycle machine? Got any input? Maybe the phrase " ALL DAY" in TA speak really means 3.2 hours out of an 8 hour day? Even their you tube video repeats the all day every day claim.I dunno, I'm stumpedHey~!! It's a hobby. It's not supposed to make sense~!!
Reply:Not sure their wording but its the same machine as a Longevity Forcecut 42i and that machine makes clean cuts at 1/2 no problem at all. Lanse has a few videos on the Forcecut. It will severancecut up to an inch. There is no industry standard for Cut vs Severance. Per Jim Colt, HT uses 10" per minute to determine cut thickness and anyting about that is called Severance. I don not believe TA uses such a strict guideline.. Personally I have my own definition and that is when the cut marks are straight. when I see the cut marks making a significant angle backwards I call that a Severance.I think it would be pretty hard to hit the duty cycle. Lanse has a video where he cut for 45 mins straight and did not hit the duty cycle as I recallTiger Sales: AHP Distributor www.tigersalesco.comAHP200x; AHP 160ST; MM350P, Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma. For Sale: Cobra Mig 250 w/ Push-pull gun. Lincoln Wirematic 250
Reply:Same machine? Sure looks way different.. The Cutmaster 42 will not cut all day at 40 amps. You will be changing consumables at least half the time.. Not it's strong point, but it's a good machine if you can live with that issue..Esab/Lorch ET-220iEsab 160i caddyThermal LM-200 Lincoln feedersThermal Pee-Wee 85sThermal 60i- 3phase /RPC powered (Beast)Thermal Drag-gun 35CINE 1500 Klutch 140i
Reply:I don't imagine that one can have standards for quality and severance given as how operator error is a major player. In the machine tool industry there are milled surface finishes that go to 500 which is band saw cut all the way to mirror polish. Because it's a machine process it is very regular.I was just on the Everlast site They have a HV 50 amp at 60% duty cycle for under $700That's pretty competitive.Hey~!! It's a hobby. It's not supposed to make sense~!!
Reply:I would not touch most of the Chinese Plasma cutters. the Longevity 42i is the only one I would recommend. (yes its made in same factory as the TD's) u get what u pay for. ask why Longevity can sell their other plasmas or multi process machines with more amps for less than the 42i? Quality cost money.... also real plasma cutting is rated in Kilowatts not Amps. There is plenty of info on this in the Hypertherm forum...Tiger Sales: AHP Distributor www.tigersalesco.comAHP200x; AHP 160ST; MM350P, Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma. For Sale: Cobra Mig 250 w/ Push-pull gun. Lincoln Wirematic 250
Reply:As far as the spec sheets for the Cutmaster 42......this is from the official T-D service manual:When operating the Cutmaster 42 on 120 volt input power it produces a maximum output cutting power of 27 Amps @ 91 load volts @ 30% duty cycle.When operating the 42 on 230 volt input power it produces a maximum output of 40 Amps @ 96 load volts @ 40% duty cycle.There are no cut charts that I can find for the 42 that list the thickneses, the cut speeds, the standoff and the arc voltage.....but from my experience, cutting 1/4" steel at 40 amps with plasma requires 130 load volts (that is the actual arc voltage measured between the electrode and the plate), and to cut 1/2" steel at 40 amps requires about 140 load volts.So.....when you cut thicker material, the amperage stays constant on these power supplies and the load voltage increases with thickness. Any power supply (welder or plasma) will generate more heat as the load voltage increases. More heat buildup reduces the duty cycle rating. Since the 42 is rated at 40 amps @ 96 volts (40 x 96 = 3,840 watts) or 3.8 kW.......yet to cut 1/2" steel it requires 140 volts (40 x 140 = 5600 watts)......expect the duty cycle of the Cutmaster 42 (when cutting anything over about 3/16") to be much lower than the advertised 40%, likely in the 10% or less range. Even on 1/4" the Cutmaster 42 will have very low duty cycle...as the voltage required is much higher that the duty cycle rated voltag output.Lower duty cycle output is less expensive to build. Yes, the Cutmaster 42 will sever 1/2" plate and likely even thicker, however it certainly is not a production machine on that thickness. A larger system with a rated amperage multiplied by the rated load voltage of 5.6 kW or more should be used for production cutting of 1/2" steel. Hypertherm units are rated with 3 different ratings, Production, Maximum, and Severance capabilities. Production is the thickness your can cut at the advertised duty cycle. Maximum is what the system will do at speeds above 10 inches per minute...although expect the duty cycle to be lower than the advertised rating. Severance is what a good operator with a steady hand can sever. Severance ratiings could be used for cutting the occasional bolt that is thicker than the machine was designed for.Also....duty cycles are (wth major brands, not with most low cost imports) rated assuming it is 104 degrees F. On a 70 degree F day....expect higher duty cycles.Hope this clears this up a bit! Higher duty cycle means nothing unles it is backed up with an ambient temperature, a load voltage and an amperage......and if there are cut charts included with the system (many manufacturers do not provide detailed cut charts!) you can easily see where you will likely exceed duty cycles or be simply simply be cutting too slow for your job. The Production, Maximum and Severance ratings should be an industry standard.....I think Miller has started using the Hypertherm ratings on its systems...If I needed to cut a lot of 1/2" with good productivity.....which system would I pick of these three Hypertherm Powermaxes....all of which will cut 1/2"? Powermax30.......Powermax 45.....Powermax65. It would be the 65 hands down. If I needed only occasionally to do 1/2", the 45 does a great job. If I need to zip off the occasional 1/2" bolt, the 30 will do it. With the Cutmaster and the Longevity 42 specs....I guess I'm not really sure, but I bet their sales force will tell you they can do it!Jim ColtLast edited by jimcolt; 04-23-2013 at 09:51 AM.
Reply:And if Raul was not confused by my explanation he sure is with Jim's. Good info again there Jim. My ESAB came with an Kilowatt/duty cycle chart in the manual, Longevity did not.Tiger Sales: AHP Distributor www.tigersalesco.comAHP200x; AHP 160ST; MM350P, Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma. For Sale: Cobra Mig 250 w/ Push-pull gun. Lincoln Wirematic 250
Reply:The difference to look for in regards to performance with a plasma cutter....especially air plasma is:-Rated amperage and arc voltage at rated duty cycle. Amperage alone means nothing when it comes to cutting power.....there are a few 45 amp units that will literally blow the doors off a few 60 amp units in terms of cut speed and cut quality. Duty cycle is hard to understand as there are so many factors.....but if anyone needs a detailed explanation I'll be happy to write one!-Torch technology. There are 30 year old torch designs and there are recent torch designs. Designing the process to provide the best combination of cut quality, cut speed and consumable life is an ongoing project. Only a few companies invest engineering resouces in this...others simply copy older technology designs. The torch itself plays as big of a part in terms of cut performance as the power supply does.-Price. If that is you primary concern....keep in mind that there are two factors that involve the cost of a plasma cutter. One is the purchase price.....the other is the cost of ownership. Cost of ownership factors in the purchase price, operating cost (consumables, cut quality, down time, etc) over time. If you are on a low budget , consider plasma systems with a low purchase price......don't expect equal performance, but they do cut metal rather effectively!Jim Colt Hypertherm
Reply:There are no cut charts that I can find for the 42 that list the thickneses, the cut speeds, the standoff and the arc voltage..
Reply:Originally Posted by jimcoltThe difference to look for in regards to performance with a plasma cutter....especially air plasma is:-Rated amperage and arc voltage at rated duty cycle. Amperage alone means nothing when it comes to cutting power.....there are a few 45 amp units that will literally blow the doors off a few 60 amp units in terms of cut speed and cut quality. Duty cycle is hard to understand as there are so many factors.....but if anyone needs a detailed explanation I'll be happy to write one!-Torch technology. There are 30 year old torch designs and there are recent torch designs. Designing the process to provide the best combination of cut quality, cut speed and consumable life is an ongoing project. Only a few companies invest engineering resouces in this...others simply copy older technology designs. The torch itself plays as big of a part in terms of cut performance as the power supply does.-Price. If that is you primary concern....keep in mind that there are two factors that involve the cost of a plasma cutter. One is the purchase price.....the other is the cost of ownership. Cost of ownership factors in the purchase price, operating cost (consumables, cut quality, down time, etc) over time. If you are on a low budget , consider plasma systems with a low purchase price......don't expect equal performance, but they do cut metal rather effectively!Jim Colt Hypertherm |
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发表于 2021-8-31 22:04:27