Knowledge Hub > Plasma cutting machine: how to find the right one for your plant
Plasma cutting machine: how to find the right one for your plant
With the rise of plasma cutting machines in manufacturing, there are plenty of models on the market.
They vary in their build and their price. But the obvious choice is not always the most expensive one. To find the right plasma cutting system, you need to know what expectations you are planning to fulfil. An assessment of each machine is mandatory. In this guide, we will show you how to make the most out of your investment, by asking the right questions.
Thickness
Plasma cutters have no bottom or minimum thickness that they can cut. Their efficiency depends on the width of the metal intended to cut. The key to giving the best quality cut on any given thickness of metal is amperage control. Amperage is the strength of an electric current measured in amperes, and it will serve as a quantification to differentiate the proper machine for your plant. There isn’t a universal guide for this process, but manufacturers have determined some rules to follow for a seamless cut:
A ¼” cut needs approximately 25 amps of output
A 1/2″ cut needs a 50-60 amp machine
A ¾” – 1″ cut needs 80 amps output
Cutting speed
The cutting speed for a metal plasma cutting machine is known as Inches Per Minute (IPM). It is crucial to navigating wisely between low, fast and optimal speed. Moving too slow or too fast will create speed dross, an accumulation of molten metal on the edge of the cut. Travelling too fast or too slow will make a low-quality cut and unnecessary debris. Their removal will slow down the whole process since you’ll need to do a lot of touch-ups
Duty cycle
The duty cycle of a plasma cutter is the amount of time it can operate uninterrupted within a ten-minute span before needing to cool off. If a machine has a 60% duty cycle at 50 amps means you can cut with 50 amps output power continuously for six minutes out of ten. A high duty cycle percentage means the longer you can cut without taking a break.
High frequency start vs Contact start
There are two popular ways to create a high-temperature cutting process; high frequency/ high voltage discharge and the contact/blowback start method.
The high-Frequency start type is widely employed and has been around the longest, but it often interferes with surrounding electronic circuitry, can damage components and increases maintenance issues. Contact start requires less wiring. It’s easier to use and is economical too.
Consumables
Consumable parts are certain parts in plasma cutting torches that require replacement from time to time. To determine the longevity of a consumable, manufacturers use two different measurement standards, the number of cuts or the number of starts. When comparing consumables, make sure that you are using the same measurement unit for correct calculation. Ask your professional guide about the consumption rate of your equipment to help save money over time.
Our plasma cutters are all equipped with genuine Hypertherm consumables, to enhance cut quality, extend consumable life, and boost productivity.
Portability
A small machine design, preferably with built-in storage for cables and consumables, is perfect if you don’t have plenty of implementing space in your plant.
Also, if you want to move your plasma cutting machine around the sites of your plant, then having a portable unit will improve and facilitate the work process. Anyway, a heavier plasma cutter can cut thicker material. Settle on a machine in accordance with your plant’s needs.
Software
Software programs allow the operator to design, cut and control the operation of the machine. Usually, the software that controls the plasma comes along with the CNC plasma table setup.
Look out for software created and optimised specifically for your table. Usually, the same company that produces the table writes the software. Maintenance of the plasma CNC cutting table is essential to prevent damage to the machine and future abrasion.
Machine structure
Check on the quality of the table design, the length of the torch, rolling surfaces and other components. Different models are more comfortable in different situations. Make decisions according to your circumstances.
Fume Control
A plasma cutting machine produces dust and smoke. Without proper measures, they can quickly advance in every part of the working space. A downdraft system is very effective for eliminating dust and smoke but is typically custom configured for each installation. A water table is another fume control system, but a bit riskier than the previous one.
Run trials
Make tests on several machines, at the same rate of speed, on the same thickness of material to decide which machine offers the best quality. According to your budget, there is always a possibility of purchasing a used machine.
Look for a plasma cutting machine that provides a quick transfer from pilot to cutting arc at a significant transfer height. Also, a longer arc means a higher voltage and a higher ability to cut through a thicker plate.
Finally, make sure the retailer offers a good return policy and a reliable warranty that will ensure you fully in your investment. To learn more, contact our team of experts here.