Rebuilding terribly engineered laser cutter

[threedee]

What is powering all this setup? It must be PSu problem. Buy a proper industrial PSU, even from China, say Meanwell at least. A no name PSU=Crap 100% of the time

You mean low voltage power supply ? I need to check the name. Checked voltage on it, its holding at 24V while operating.
As for high voltage its Zye MYJG-100W. That has absolutely nothing to do with motion at all.

They have good ides but their attention to detail is poor. I had to rebuild my 6040 cnc router to make it work properly. And when i upgraded i just built my own machine:)

That is exactly what i thought and will do myself. As for having good ideas - hell no, in this case its an astonishing display of cost related corner cutting and nothing else...

[ericks]

I have also been looking at lasers.....basically also decided to build my own. We have a small trotec laser here at work, they paid $35000 aud for it. Let me tell you there is nothing in it to justify the price

[threedee]

35k Aud for a small laser, yikes.

But, yeah, there is absolutely nothing in there that justifies the price. Not even tech support.
What is laser cutter anyway... 1 tube, 2 power supplies, 1 controller, 2 motors, 2 motor drivers, some switches and wiring in a box. With what i know now i wouldnt have even entertained the idea of importing manufactured laser. Even if i didnt pay for it 35k, i would have built it for one third or half of money i paid... Bloody annoying... Got a nice case though :D

[ericks]

Yes ours at work also has a very nice rounded case and a small stand:)

Obviously they would come out for repairs/maintenance but it's going to cost heaps!!

[threedee]

This image says a lot...



It's unclear from some of the other pictures, but this one is particularly interesting as it would appear to show the distortion on spokes projecting radially from the spiral centre, and at a position where the Y axis velocity is tending to zero or accelerating from zero. Is this true of other images? (they are less clear).

Could this be related to torsional elasticity of the couplings/Ali extension bars on the Y-axis?, is it worth trying to drive the two belts separately with two steppers, and removing the length of Ali bar?

Just a random thought

This particular picture needs rotated 90 degrees. The "spokes" radiate in X direction (horizontal).
ALL spiral cuts at ANY speed exhibit this same pattern. Lower the speed, closer the oscillations, making even through cuts difficult in those places due to increase in speed due to vibration. When on cutting speeds (10-20mmps) either kerf gets too wide (by increasing power beyond required for cutting) or not cutting through (power is set exactly right for cut through).

I have replaced aluminium spiral couplers to spider couplers to no effect. The shaft that drives Y is 8mm bars, cant be that much windup in them.

Also, the "spoke" pattern changes angle on changing speeds, but is always there and always radiate in spirals/circles. It makes a strong case for resonance vibration somewhere, i'm convinced that its the Y rail bolted into case. Being only 12mm and 750mm long it can act as an amplifier for vibration from motors... Hence me replacing Y.

Yes ours at work also has a very nice rounded case and a small stand:)
Obviously they would come out for repairs/maintenance but it's going to cost heaps!!

Cost whom ? You or them ? If its you - whats the point for that 35k price :D

[ericks]

Yes our company will have to pay....
Those tubes don't last forever

[threedee]

Yes our company will have to pay....
Those tubes don't last forever

Replacing the tube is pretty straightforward, they are not that expensive in grand scheme of things. None of this warrants 35k in my opinion.

[Doddy]

This image says a lot...



It's unclear from some of the other pictures, but this one is particularly interesting as it would appear to show the distortion on spokes projecting radially from the spiral centre, and at a position where the Y axis velocity is tending to zero or accelerating from zero. Is this true of other images? (they are less clear).

Could this be related to torsional elasticity of the couplings/Ali extension bars on the Y-axis?, is it worth trying to drive the two belts separately with two steppers, and removing the length of Ali bar?

Just a random thought