THE 3D Engrave

engraving
3d

#121

I think the alignment for a flip cut is something they are still working on. It has been mentioned as a feature they are planning on, but I don’t think they’ve been able to perfect it yet, at least there hasn’t been any mention by anyone in the know.


#122

One of the things I wish I knew (sorta) is what “still working on it” means in all these contexts. In some of them, it may mean “we’re coding the basics”, in others “we’ve got it, but there are corner cases”, in yet others “it works, but we don’t love the results enough” – with the third being the 3D engrave, where you have to make a curved gradient to get a straight line…


#123

No because the beam is always a cone, so when focused at the bottom it would be obstructed at the top of the trench if it had a vertical side. As you go down you have to move out so the cone is clear of the edge. That leaves a sloping side. As it is true for both sides of the beam you need to make a V shaped trench by engraving it wider at the top to allow the cone to enter when you focus lower.

The focal length is about 2" and the beam will start out probably about 4 or 5mm so that gives you an idea of the cone shape. It isn’t a perfect cone because it doesn’t focus to less than about 0.006" and that gives a straightish bit like the middle of an hourglass.

That is for @dan to answer. It is one of the advertised features that it will use the two cameras to allow precise alignment. I don’t think it is implemented yet.


#124

I agree, the “working on it” is rather vague. Just my impression (and that’s all it is), is that they are still working to perfect the aligning through the camera system. Most of the other “still improving” areas seem to tie back to that. In the case of the flip cut it ties directly to that. I know from what dan has said they are trying to make everything as fool-proof as possible to make it as easy to use as possible, which takes a magnitude of work far beyond what most other products try to achieve. But like you, part of me wants to know the details–but if I did then I would have to keep them secret and that would suck.


#125

Not certain this will help your understanding of the process in general or GF’s implementation in particular, however, Russ at SarbarMultimedia has done a video featuring the ramp function as used when engraving using a CCL. Not sure if it is this one or this one.


#126

Thanks for the help! I will check out the videos.

edz


#127

Basically they’ve cut the piece in at least two passes. The first pass is a (or the first few passes are) deep engrave(s) and the second pass (or final pass) is a standard vector cut. The first pass engraves a channel that clears a path for the laser to come in and do a vector cut.

Think of it this way…
Let’s say you had a 1" thick piece of wood, let say it’s about the size of a business card (3-1/2 x 2"). Let’s also assume that we know the Glowforge is capable of engraving this particular wood 1/4" deep. If you were to “engrave” the entire piece of wood, you’d reduce the thickness to 3/4". The new dimensions would be 3-1/2 x 2 x 3/4". If you were to repeat that process, you could take it down to 1/2".

If your goal was to end up with two pieces that were 3-1/2 x 1 x 1/4", you could do the whole-surface engrave one more time to get it down to 1/4" of thickness. Then you could come in and do a vector cut to split it into two.

Or, if you wanted two pieces 3-1/2 x 1 x 1" (or close to that) you could engrave just a channel for the final cut, instead of engraving the whole thing.

If you don’t want to move workpiece and with the 1/2" of focus range of the head, the maximum depth you could cut would be 1/2" + whatever thickness you could normally cut with a focused beam.

For instance, if the laser is powerful enough to cut/engrave 1/4", you’d be able to get through 1/2" + 1/4" for a total of 3/4". You’d do one 1/4" engrave at the top of the 1/2" of focus range, then a second 1/4" by bringing the focal point down 1/4", then do a third 1/4" by bringing the focal point to the bottom of the range and doing a third engrave (or a cut).

… at least, I think that’s what they’re doing - pretty clever!


#128

Honestly, we didn’t plan to be able to do that, but with some careful experimentation we figured out settings to make it possible with Proofgrade hard maple & walnut. Likely can do it with other materials too. The secret is going slow and removing a wide area of material on multiple passes so the lower-focused lens can do its trick.

It is 1/2".

Going thicker than 1/4" is very slow, so I wouldn’t plan on doing it regularly.

The slope is, if my recollections of trigonometry serve, <2 degrees.


Sepele and other Exotic Hardwoods
Weekly Highlights for the week of 11-DEC-16
#129

Theoretically true but as yet untested. :slight_smile:


#130

That agrees with my experience cutting with an Epilog machine.


#131

#132

I remember taking a class in HDR photography from Terence after he had taken that photo. Glad to see that he is working to protect my investment in Glowforge.


#133

They do seem to have snagged some talent, haven’t they? :relaxed:


#134

Nice. I love watching things actually happen.

Seeing the end product of 3d in the December QA, imagining that with pass-through and seeing people getting refunds when asked for I upped to the pro a week ago.

You just re-confirmed that choice watching that, thanks.


#135

I agree with you completely. We only have so many hours a day so we have to decide what we want to do with that time.

It’s like owning a classic car. It may be beautiful and you have fully-customized the engine and interior, but you are going to spend a lot of time tinkering with it to keep it in top shape. (Most old car guys I know say they spend more time working on their cars than actually driving them, but those guys say that is what they love about the hobby). Do you want a cool car to drive around, a cool car as a project, or something in between?

I sell 3D printing services on the side. I could have built my own printers for a lot less money, but I spent the money for prosumer machines. Why spend that extra money? Because I’m being paid to print things for people. They aren’t paying me to tinker with my printers. Or to get a new printer and spend a week or two building it and dialing it in. I get lots of projects from people who were fed up with my competition, who constantly have printer issues.

This is why I purchased a Glowforge. I don’t want to spend weeks researching how to rewire a laser with shoddy wiring, figuring out a cooling system and then having to tune things. I could if I wanted to, but I’d rather spend the time making things and spending time with my family.


#136

Well said!

Quality well built printers/lasers/etc take care of themselves (and you), while labors of love pay off with great satisfaction.


#137

I believe your trust in the Glowforge will pay off. It is extremely reliable. Dialing in designs and tweaking settings to do projects without tying it up for hours can be a problem, but that is all relative, as you know from the extruder world.


#138

I do believe it will pay for itself in no time.

I have three clients that are patiently waiting for it to arrive. One project will be a pretty big project for the GF - engraving around 500 small acrylic blocks for a college class reunion. (all will be identical) Luckily, they don’t need them finished until February 2018.

The other two clients are developing prototypes that will be a combination of laser cut parts and 3d printed parts. If I don’t have the GF by the end of August, (I think I’ll realistically be early to mid-October, since I ordered in the middle of the initial campaign). I’ll have to farm it out, which will shave off some of my profit. BUT, this is why you always mark up costs and add extra time to any paid work. And I don’t want the first thing I do on the GF is work on a project. I need some time to get to know the ins and outs of the GF.

I also backed the Wazer watercutter on KS last fall. If it ships on time (which I doubt, because it’s a Kickstarter) I could possibly cut the parts for the prototypes with it. In reality, I realize both will arrive the same week and something will come up to prevent me from having time to play with either one.


#139

Isn’t that the way it always goes :confounded:


#140

Is this design file and settings available on here somewhere? I would like to study it so I can make similar, thanks!
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I came back to see if there were any replies and the link to the design I was referring to is gone! What happened?


Etch: Color vs Grayscale