New thought on a rotary concept

challenge accepted.

yes I could farm the order out. but what if I was the person people farm the orders out to.
THINK out side the box big picture. creating space under the forge is the easy part

thank you for pointing that out. I believe by placement of the gantry so that when the laser head makes is X moment for alignment it will be under the camera. moving on that thought the Y motion the GF makes to get to this point is a very fast movement so it may toss any item off of the rotary system. possibly a build in inertia clutch. think cap on

thanks for the positive insight

If you cut the bottom out you will probably also be cutting yourself out of any sort of future hardware support from glowforge.

I’m just saying that sure we could come up with ridiculous workarounds all day long, I just fail to see the point.

You wanna be that person that gets farmed out to? Buy a proper rotary engraver and profit away. The Glowforge just isn’t your machine for that.


This phrase and attitude has led to some awesome stuff, some stupidly awesome stuff and hangovers galore. I have no problem rooting you on - go for it.

However, the glowforge is a hobby machine. As a business machine its best use case is as a complement to a business or a gateway to a lasing business machine. There are lasers out there with four inches of z-depth and rotary attachments that are meant to handle 1000 units. There are probably sand blasting cases set up to do batches of glassware.


Theoretically Glowforge could do a useable rotary since they have a removable head. They could make a head that reflects the laser forward instead of down and mount a rotary unit in front of it without the tray. They would have to get control to the rotary unit and then the concern of laser beams flying around but theoretically…

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the end goal is to move into more space and yes upgrade to industrial set up… I may end up not doing the wine glass but I would like to be able to do rolling pins. small shot glasses and a have the ability to do shorter this that will work with in the 2.5 inch clearance. with out having to cut the floor of the forge.


Shot glasses work fine.

I have not looked at the idea of the removable head. that’s another bunny trail to chase. down that maybe the answer to wine glasses. still use the same set mechanical set up to allow the forge to do the rotating of the object

I like the out side the box idea thanks

I would like to do larger etching and maybe wrap all the way around the glass with out having to do multiple manual resets.

I bet you would get a 4" piece in it too.

You really want to get this granular on building your own engraver, you ought to look at a lasersaur. You’re wasting your time trying to make a glowforge do this, there are just too many very large stumbling blocks.

As an economic argument, buy a k40 and have at it. Less than a grand all in even with upgrades and you won’t have destroyed your glowforge trying to do it.

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your comments are appreciated. Thank you for the negative vibes.
instead of listing all the ways this will not work have fun and think out side the box of the ways it can work… I know its a problem. WE all know its a limit the GF has. instead of saying its not going to work because of this be positive and say hay your going to have issues with this and give a theory of how to work around it

Okay. Where to begin.

What you are referring to is the GT2 belt on the left and right side of the unit. Which are connected to a GT2 pulley on each side. The issue is that the unit is internally configured to move a specific distance per step. This is how it knows how to move 1mm or 25mm. To translate that to a controllable/predictable rotation in degrees is complex and eats up space.

The easier method is to keep the unit stock and move/rotate the object underneath it.

But the main issue is even with the tray out, there is not a lot of space to have a rotary and have it hold an object more than 1.10" (while keeping the head a set distance so the focus can work correctly.) The rotary itself would have to be super low profile and still have a stepper motor, controller and a means to power it in that short foot print.


If I had a guaranteed order for 1000 wine glasses, that will pay the totality of a Trotec, Universal, etc. unit that already comes out of the box with the ability to do the job, no muss and no fuss. Then you have a new machine, completely paid off, with much more capability and potential… plus a glowforge that’s still very capable.


I built a prototype rotary that would use the whole height and work without disconnecting anything. Obviously you would be restricted to height limits, but it wasn’t too hard to do. I was going to refine and sell the design in the shop when they started letting users sell things, but they never did.

And I assume it would rely on engraving strips of an image one after the other and manual rotation of the piece? Or did you solve the whole thing?

Way back machine (see above re: well-trod)


Anyway. Back inside my box of negative vibes.


It worked like a regular engrave. No need to do anything manually!

Still limited to 2" tall, but I had a potential solution to double that to 4" as well (maybe a little beyond that). Never got around to testing the height mod though because I got too busy with other things, and already had a working full size rotary on my big laser

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That is absolutely fantastic! You are much more of a visionary than I am. 4" would be astounding really…that’s beyond anything I thought could be done.

Have you considered offering your design to GF again? It looks like they are selling GF user designs now.

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Congrats on the large order. Maybe get something like the ortur 2 laser? You can also get y-axis rotator for the glass. Not too much money. And get light burn software to run it.