You all have bougth your machine or, like me, has done it by yourself?
if second, what about use 9mm belt? At the moment i use a 6mm GT2 belt with belt tensioner, and i’m guessing that i had done a bad job.
Is your machine ss or co2? Hard to tell from your information.
These things all work the same for all practical purposes the more specifics we know about the hardware the better to assist you… 
I bought a China Blue 50 watt 5030 machine.
It’s been hacked a bit. Do you have a question in mind?
I did a DIY laser, the size belt you need depends a bit on the size of the laser. I built a 600x900 mm and use 15mm belts
mine is a 400X300, and you use belt tensioner?
is a diode, no Co2
How true, although I’d say based on mass, but yes. How much does your head weigh and how fast do you intend to accelerate it. How much power do you have to accelerate it?
It’s not a very simple answer and I probably couldn’t answer it properly with all the information. There are a few places that make these belts and they have guidelines about how much they will take. In all probability they are probably tougher than needed since in reality they are timing belts and we are using them off spec so to speak.
My head only weighs 180 grams and I use a 20mm belt I believe. Of course, I have my acceleration set at 50,000mm/s/s and I can run it 1650mm/s. I doubt you’ll have any problems.
We’re all curious here about DIY machines…always nice to see a picture
Btw, the problem is this, i upload an image to explain
as you can see in the yellow circle i had some lines, the movement was from bottom to top on Y, X was moving left to rigth.
In red circle you can see that lines are quite gone that’s because, and i made it intentionally, i have tensioned a little more belts.
The blue one is were belts detached from Y carriage
You might have better diagnostics with a square and circle as something to look at and see if everything is lining up.
There’s definitively an issue. Which belt are you struggling with, both? On my machine it will jump a tooth if too loose and I can feel it load the the axes when too tight. No power just touch…
yes both of Y, as you can see from pics i have 2 motor on Y
Someone probably has documented how much flex you can have in belt tension. However I feel it’s best to manually move the device and add tension from a ‘too loose’ position until I feel it load up. How much you’ll have to discover on your own.
You acceleration is pretty low at 83.3 mm/s/s, assuming your units are inches. Many of these are in mm not inches…
Doubt you’ll have any issues with the belt being over-stressed in either situation.
define a little better “load up”, you mean when you feel some resistance when moving carriage by hand?
As you increase the tension it puts a ‘load’ on all the moving parts. If that load is too large you motors could have problems. Generally it’s not a linear load increase. It will start to get loaded and at some point will increase quickly, too far…
Some just slowly tighten up. You’re going to have to figure it out for your machine as all the pieces in the drive train make up the required tension and feeling. Wish I could say press this, but…
Best of luck, hope this helps…
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no i work in mm
Ok, great, I’m sure you won’t have an issue with that belt. I beat mine to death and it’s only 1/3 larger and operates substantially faster. I think mine was 8,000mm/s/s originally.
Let me know how it works out…
surely helps a lot, you know… using 3D printers since last two years i know exactly how much those belts has to be tensioned.
In engraving… i made my first less than a couple of month ago, so is all new and i tougth, making a mistake, that i had to apply same behavior.
In reality, there is no difference. It’s just the object doing the work, laser, spindle, cake icing machine, same game.
Each box will be a little different. I also have a Chinese Bibo II 3d printer. My belts on my laser are more tight than my 3d printer. But there is no comparison to the speed of the devices.
Probably a lot like the printer, you’ll just have to develop the feel. There are lots of videos out there…
Have fun…
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