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Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

K40 Laser Motorized Z-Bed

by quintesse Aug 16, 2018
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hi, you mind creating a second version with the 15x15mm tubing? 1mm walls? seems like most of us dont have acces to the 16x16 tubing.
i dont have fusion and mosly work with thinkercad and windows editor for basic things. just scaling is not gonna do the trick,
other dimensions will be off haha

Hi, I wouldn't mind, but the thing is that because I'm moving house I've been without a computer for a couple of months and I will be without one for a while more. So I'll be much quicker to try to do it yourself, Fusion 360 is free for personal use after all! Sorry I can't be of more help right now.

looking at the thread arrays: You probably do not need the nuts above the pulleys, since they are fixed to the threads with a grub screw, right?

You could very likely do without them indeed, I just never tested it.

Hi there, nice work. Maybe I overlooked it, how did you fix the array to the K40's bottom? Just a few screws?

Hi, yes I just drilled some holes through the aluminum bars and the bottom of the laser cutter enclosure. HTH

Thanks.Yes, helpful. No rocket science, but... :)

Are you sure about pulley dimensions? From documentation on the internet, your motor using 5mm shaft...

The motor and its pulley weren't mentioned in the parts list. Updated it, thanks. The other pulleys mentioned are all correct.

so any Nema17 stepper with 5mm inner diameter and 20 tooth pulley?

I'm definitely no expert in motors, pulleys and belts. I just describe what worked for me. More than that I can't do.

With the belt positioned below the cutting surface, don't you run the risk of severing the belt while cutting/engraving?

Definitely! That's why I'm using a solid metal bed plate so the laser won't get to the bottom.

Do you have a photo/video of how the corner rods are put together?

What circuit do you use to control the bed?

I'm using the Cohesion3D board (https://cohesion3d.com/shop/controllers/cohesion3d-laserboard/) which has a header for Z motors.

First of all Thank you for this Thingi!

Are you sure about the 1.5mm wall thickness for the 15x15 aluminum tubing?
I am measuring 13mm instead of 12mm on the top joint 3d printed part. I went to the DIY store and it doesn't fit.

You're saying your tubing is 1mm thick? And therefore the piece is too loose? In my case I'm pretty sure it's 1.5mm and printed with that size it's very snug (I need a small amount of force to shove the printed piece inside). Perhaps you just have a different kind of tubing? The Fusion 360 design file is available for download too so you could try adjusting it to fit your tubes?

I have not been clear I see now. I will change my question a bit.
I have printed the top joint part and tested this in this tube: https://www.karwei.nl/assortiment/profiel-buis-vierkant-aluminium-15x15x1-5mm-100cm/p/B300803 . But even with pushing hard it doesn't fit. The square part of the printed top jont that has to go in the tube is about 13mm and should be 12mm?

I was wondering if more people got this problem? For my use I will change the file.

You are completely right! It's a mistake in my parts list :-(
But it's not the thickness, but the size of the tubing. I'm using 16x16mm, not 15x15mm is originally stated in the description. I've changed it already. Terrible sorry about that.
If you know how to change the design 15x15mm should work just as well. (Some people are using the same size tubing in both places because they don't want to buy two different kinds)

I'm having a great deal of trouble finding the 15x15 with a 1.5mm wall. The 20x20 is fine. It seems like 1mm wall is much more common for the 15x15, at least in the UK. I'll likely add a shim, but it might be something to keep in mind for future iterations?

Yeah I can imagine availability might depend a lot on the country. The Fusion 360 .f3d file is available for download though and the app is free for non-commercial private use so you could probably make a version just for you without too much trouble hopefully.

You could make this stupid simple without electronics by printing 1 tensioner and forgo the motor just print the bracket and put a nut on one corner that would be turned by a ratchet up n down. Thus no electronics! Stupid simple!

You can indeed. But this is a motorized version. That way you can change height during cutting. For example to make multiple passes at different depths. Or to have one depth for engraving and one for cutting.

Thank you

With the spanner I mean the part which is inbetween the belt pulley and the stepper side (which makes the force on the belt that it is not wobble). Sorry dont know how to better explain it.

Do you have pictures assembled in the K40 as well?

Ah the tensioner. To tension the belt I used some printed pieces, you see them in the list called tensor-holder and tensor-cap. You use some thread which you wind around the center until it's tight and then you put the cap on to hold it in place.

Unfortunately I don't have any pictures or videos right now and I can't make any until next week. Sorry!

Very interesting desing and I want to make this also.
Can you tell me which some things please:
Square tube 1.5mm wall thickness?
Stepper motor?
Which spanner did you use?

Hi, I've updated the description with the requested info. You we're right, the tubes are 1.5mm thick. I also added some photos of the stepper motor I used. Unfortunately I don't understand your question about the spanner?