- March 23, 2017 at 8:45 pm #30097
Here are some plant marker signs a family member ordered. I think they turned out well. They were burned with a wood burner in the pen mount then milled with a 1/8 end-mill
Attachments:March 23, 2017 at 8:47 pm #30100
Awesome idea.March 24, 2017 at 7:56 am #30119
Almost looks like laser engraving. Is the burning very time sensitive, or just depth sensitive?
Very cool.March 24, 2017 at 8:24 pm #30147
Thank you! Glad you guys like it.
It works for me as an equivalent for a poor mans laser engraver. I want to get a laser eventually, but it is lower on the list than a print head. I have been wanting to try using the pen mount for the wood burner since I built the machine, but I have been focused on some other projects.
You can control even the cheapo “non-adjustable” $10 wood burners or soldering irons with a standard dimmer switch or router control *no liability if you burn your house down obviously haha*. It adjusts the temperature and therefore the burn darkness, but the time the tip is on the wood is a big factor also.
I got my tool speeds from taking a pre-measured section of scrap wood and running the burner tip across it at different speeds and seeing what I liked. I usually run mine at ~1/3 through the high setting on one of the harbor freight router control boxes (sorry it is non-quantitative). I want to try turning it lower and doing multiple passes for shading. Adjusting the knob during the cut doesn’t really help with that because it doesn’t catch up on temperature quickly enough to shade it during the cut (unless you were to include some sort of pause or tool change type code). Either way I can get some really good detail with it. The little signs are 1.5 inches tall (the sign portion, not the stake) so you can see that cabbage has some legit details, and that isn’t with my finest wood burner tip.March 25, 2017 at 6:12 am #30156
That is an awesome idea. Never thought about trying that. HmmmmmmMarch 25, 2017 at 7:43 pm #30193
Using the dinner switch to control the darkness, and then using it to do like scan drawings. That would be awesome.
This sounds like an interesting napkin engineering opportunity.
First, you need to control the dimmer with the Arduino. You could go the route of the servo and two years, there are some youtube vids with that.
But the hard part is the time latency between changing it and having it get to the temp. The other likely problem is that the temp change is likely open loop, so you won’t get consistent temps…
You could add temp feedback, and then you could add a control loop. If the speed you moved the pen is way way slower than the temp change, then a PID would work. But it’s probably not. Better would be to predict what temp you want in the future and then set the setting early (I can’t remember, is that a lead-lag?). You’d have to have your controller see the gcode before the Marlin did. Then there’s the problem of accurately determining the model for the pen, which is probably simple.
The other thing you could do is in the CAM software. Instead of just driving at a single speed trying to vary the intensity, you could drive at different speeds, and vary the speed… That would be a pretty simple solution, actually. You’d just have to find Leo, and bring a six pack.March 25, 2017 at 8:51 pm #30201
Those look great! Does your wood burning device pivot like a drag knife?March 26, 2017 at 7:41 am #30210
@jeffeb3 -All, good ideas. I would really like to add at very least a temperature monitor to know where I’m at, because right now I just have to wait a few minutes to be sure it has gotten to a consistent temperature. I am sure I could add a servo controlled knob with the arduino or even just directly control it with a PWM motor controller, but the latency between adjustment and temperature change would still be an issue. I think the simpler solution that I would like to try for now would be to run the tool-paths multiple times to get darker results. So, I could run it once on a lower setting to cover all areas I want at the minimum darkness then go over the areas I want darker 2 or 3 times to control shading.
@Jim Hildebrandt – Thank you! no it does not pivot, but the burner comes to about a 45 degree “V” type point and because it does actually burn away a small amount of material as it goes through it moves along fine as long as you don’t move it too fast or deep.March 26, 2017 at 8:42 am #30215
I found a wood burner on Amazon for $0.10, plus a bit less than $5.00 in shipping (I’m guessing someone didn’t notice where the decimal point was), so I’ll give this a try later in the week. 🙂March 26, 2017 at 1:07 pm #30237
My feed&speed/tool settings are from Fusion360 if you want to try them with your burner. I use cutting feedrate of 152 mm/min (don’t forget to convert to units if you are switching it to estlcam and your tools are in mm/s) I use the same rate for lead-in and lead-out and Ramp. Plunge rate is 200 mm/min.
I have my depth of cut at .02 mm
I have used pockets to shade in areas and contours to trace the lines I am also about to try fusion’s engrave for one of my complex shapes that had a bunch of outlines. I’ll post results later.March 26, 2017 at 4:26 pm #30246
So, because of how fusion’s engrave works, which I personally really like normally, it did not quite do what I wanted with the burner so I ended up just converting the engrave path back to a contour, but I finished up this order, and I think they turned out well.
Here are the new ones and the finished set.
Attachments:March 27, 2017 at 11:04 am #30306
When you get a chance can you get a pic of the wood burner on there. I would love to put a link to this thread in the how to page. I get pretty excited by new ways to use the MPCNC.March 31, 2017 at 6:08 am #30577
I would be glad to get some better pictures of it mounted up or even a video of it burning. I have a couple of pictures from running this batch, but the next time I hook it up to run I’ll get some better ones.
Attachments:March 31, 2017 at 12:07 pm #30593
Cool idea… what type of wood are the markers made from ?April 1, 2017 at 6:58 am #30617
Great idea I gotta try this out just bought a new wood burner a few weeks ago ive been wanting to play withApril 1, 2017 at 11:05 am #30637
I am using 1/4 in poplar currently. I used fusion to create a path for the wood burner first. Then I ran that, swapped tools and ran my endmill. The “post” is created by making 2 pockets to recess that section from the sign part.
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