Buying a Used Laser Marker: A Complete Guide to Avoiding Common Pitfalls

This article will guide you through the process of inspecting a used laser marking machine, including checking the exterior, testing core functions, and assessing consumables. You'll quickly learn how to avoid the common pitfalls of buying a refurbished or defective machine.

Why is it that the first step in buying second-hand equipment is to have it tested?

Many people are attracted by the low prices of second-hand laser markers, but it's easy to be taken in by a refurbished or defective machine if you're not careful.A friend of mine bought a second-hand machine for NT $ 30,000, but after less than two months the laser tube broke down and the repair bill was more than the machine cost.The tips we're giving you here today are intended to help you nip that risk in the bud, before you hand over your money.

Preparing to test a machine.

Don't rush to see the equipment.

First, the seller should record a short video of the machine's self-checking process, the results of testing various materials, and the machine's label information.In particular, pay attention to whether the laser is working steadily. If the video suddenly stops, there is usually a problem.

A checklist of essential tools.

Remember to bring a flashlight (to check for scratches on the lens), a vernier caliper (to measure wear on the track), and a smartphone with a frequency analyzer (to listen for unusual noises in the motor).The test piece is then taken to a testing lab to measure the depth of the plating.

Core parts inspection.

How to judge the lifespan of a laser.

The buyer will ask the seller to open the software and check the laser operating time record, and will pass on any machine that has been used for more than 8000 hours.If the heat sink is too hot to touch after 30 minutes of work, the cooling system may be aging.

The optical system should be carefully checked.

If you see cracks or spider-web patterns in the lenses after removing the cover, don't buy it.If you use a cotton swab to wipe the edge of the lenses and they turn yellow, that means the lenses are not being properly maintained.

Don't forget to check the mechanical parts.

Push and pull the work table to see if the rails are smooth. If there is any resistance, the rails may have deformed.If the lubricant on the screw rod is black and clumped, it indicates that the machine has been neglected for a long time.

These are the minimum tests required.

Continuous marking pressure test.

The machine was set to operate continuously for two hours, with a ten-minute break for a standard pattern.If the lines are thicker or lighter than before, the watch is not accurate.

Speed limits.

If a machine can run smoothly at 120 % of the rated maximum speed, then it's a good machine.Listen for a humming sound from the main shaft motor. If it sounds like the bearings are breathing, they may be worn.

Negotiating tips.

If you spot a minor problem, don't just point it out directly. For example, you might say, "It seems that the track needs to be realigned.When a seller is nervous, he will usually cut the price 5-10 % on his own.If you encounter a model from before 2018, check to see if the manufacturer still supplies parts.

Finally, a word to the wise.

Don't be tempted by "sell quick, low price" ads. Legitimate sellers will give you time to check out their products.The contract must state that the buyer can return the item if a major defect is discovered within three days. It's best to use a platform to make the transaction and leave a record.Remember, good equipment has no fear of inspection. Ninety percent of the time, equipment that's rushed for payment has a problem.