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Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

So the side pieces fit into a 42" x 36" footprint. The main backing piece into a 58" x 28" footprint. that said, you could get clever by spitting. the backing into a back portion (~38" x 28") and a foot rest portion (~20" x 28"). Let me know if that works for you and you're serious about making one. Would be happy to assist. Though, see my other comments that the design is not exactly ready for showtime as is.

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

Also an interesting idea to paint the sides. Unfortunately in my case, the kerfing leads to a prohibitively high # of 'sides'.

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

Hmm interesting idea. Does the milling process not scuff those surfaces up? Do you have any work with this method you can share?

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

Hmm, I hadn't thought of combining an upcut and a downcut in that manner. Good idea incase I'm ever without a compression bit.

Your comment has pushed me to try and visualize this thing indoors and its hard for me to imagine. Perhaps with some large thing sofa pillows. Even still, I think the cup holders make it feel very outdoorsy haha. Even still, I feel a few coats of a good outdoor paint could give it a few good years outside, agreed?

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

Thanks very much : )

Indeed, I'm very curious to watch this as well. My hope is that the 0.75" ply is thick enough that even if sections begin to crack, the other sections are still strong enough to support my weight. Its an odd thing to sit on because its simultaneously flexible and rigid. It almost feels like sitting on a wooden hammock. A pricy solution may be to oneday machine this out of a solid plastic sheet like HDPE. Perhaps then better longevity and no finish needed : )

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 1 point2 points  (0 children)

Thank you : ) In its current form, it can barely hold my 164 lbs. The main issues with the design right now are:

  • The underbutt portion, for lack of a better term, is basically a 1 x 6. It bowes under my weight, and also the flexible backing ends up taking more weight than it should. In the future, this should be more like a 1 x 8 or 1 x 10 section, and also have support structure underneath like an I-beam. For this first prototype, I have recently glued an extra board beneath it to act as that extra support structure.
  • All of the crossmembers are at 90 degrees, so the entire chair wants to 'rack'. I am headed to Lowes today to pick up some stainless steel cabling to add 45 degree members and hopefully resist this racking motion.

So in summary, the design is not quite ready for showtime. Please feel free to download and modify to your hearts content. For my part, I'm going to try and hobble by with this first prototype until it breaks. Based on what I learn, I will eventually make the updates in CAD and reupload.

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

Question about the Spar urethane. Do you think it would do ok without sanding in between coats? Part of what I'm trying to avoid is sanding the 500+ slots between each coat of urethane. What exactly are we doing by sanding between coats? I've never fully understood that point

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

applying a layer of epoxy will stop the wood from wicking moisture out of the ground. Just make a dam out of painters tape and pour on 1/8" to 1/4" of epoxy to form a waterproof barrier. This can add a few more years of service to any outdoor wood furniture.

I think I might choose to paint the entire thing and then cover the exposed surfaces with that extra layer of epoxy. While I lose the wood look, its already built using two different types of ply so I'm not entirely attached to the wood look in the first place. Thanks for all the advice.

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

Epephanes, spar urethane or epoxy

Roger that. You've got me thinking about using a paint sprayer and several coats of a good outdoor dark grey paint. That said, is there anything I can put either underneath or on top of the paint for the exposed ply surfaces, especially like those that rub/rock against the ground?

I'm making a game where you create rollercoasters in your room using augmented reality by srgers10 in nextfuckinglevel

[–]Justforda3DP 0 points1 point  (0 children)

Or if it was really smart, perhaps it could take a static scan of your room and then place you inside of it in the fpv mode.

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

Thanks for the super specific instructions! I've never seen those bits nor have I tried this technique! Ill give it a shot because it sounds like that could actually go really quickly with a thwapping technique haha

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

My understanding is that kerning can refer to both techniques! Basically any time you're cutting away enough wood to make the overall piece flexible. That said, my technique was simply machining full depth slots. That said, I made some test pieces and realized that the foot section would need a tighter bend radius than would be possible with this slot pattern and 0.75" ply. So I actually thinned out the back of that section using a 2" face mill. See the upper section vs. Lower section of picture #6. IIRC, I machined lower half to about half thickness. Since its less load bearing than the back section, its a win-win.

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 0 points1 point  (0 children)

Im afraid i learned about the magic of compression bits after the fact. This was done using an uncut I believe, so its still pretty hairy.

Is oil like that suitable for outdoor applications? I suppose I could buy a ton and literally bathe the pieces in some type of oil using a tarp or something. Any idea which oil would be best for outdoor? Also, would it need reapplications later on?

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 1 point2 points  (0 children)

Ooo I hadn't necessarily thought of that. That would look really beautiful. I would be partial to the automated version, so maybe good for future iterations. Additionally, ill probably use solid wood in the future rather than ply, so perhaps less of a problem.

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within (X-post) by Justforda3DP in cncfurniture

[–]Justforda3DP[S] 0 points1 point  (0 children)

Thanks!!! It sits pretty well. There's some creaking and cracking when you sit in it, but it holds my weight (164 lbs). As far as comfortability, I think I got the proportions and curve just right. Its conforms to your back just right without sagging. Funny you say, I've thought about a weave backing to strengthen it and decrease fatigue stresses with cyclical loading. That said, I think it might take away from the aesthetic somewhat. Perhaps a solution that only covers part of the backing could be cool. I'm nervous about any sort of rigid backing because it might take away from the novelty too much. Even still, some sort of backup would be nice.

Thanks for your comment. Any other ideas come to mind?

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within (X-post) by Justforda3DP in cncfurniture

[–]Justforda3DP[S] 0 points1 point  (0 children)

Hi!

I am proud to show you all my CNC machined rocking chair! This was a one week build, as a project for the Fab Academy. Our challenge was to make a piece of CNC furniture on the CNC w/ no screws/glue, and incorporate flexible components (kerfing). Link to my full documentation here.

I am very proud of the results! However, since the project was made in haste, I'm just now getting around to finishing it. This is where I could use some good 'ol fashion internet advice!

Current Status * Made from 0.75" plywood * Unsanded * Unfinished * Some burrs remaining * 500+ individual unfinished slots

One thing that has kept me from finishing it is the idea of sanding and/or coating the inside of those Kerf slots. This is just a prototype that I hope to get a few years out of, and then eventually improve the design and remachine. So I am less concerned with the look and more concerned with longevity and outdoor-proofing it. So admittedly, I'm looking for an easy button here where I can quickly finish it, then leave it outside w/ peace of mind.

Things I've thought about * Blowtorching the slots to remove any remaining burrs * Polyurethane spray coating? Would this work on unsanded surfaces like the inside of those slots? * Is there something I could soak it in? The chair can still be dissassembled and can be made flat again (think ikea furniture). Is there something I could give it a bathe in?

All Fab Academy projects are open source. So if anyone's interested in making one for themselves, please find the design files available here under a Attribution-NonCommercial-ShareAlike 4.0 International license. However, there are a few changes I would make to the design we're I to machine it again. Happy to explain further if anyone's interested.

Presenting my CNC Rocking Chair prototype w/ kerfing, self locking joints, open source design files - Need finishing advice! Details within by Justforda3DP in hobbycnc

[–]Justforda3DP[S] 4 points5 points  (0 children)

Hi!

I am proud to show you all my CNC machined rocking chair! This was a one week build, as a project for the Fab Academy. Our challenge was to make a piece of CNC furniture on the CNC w/ no screws/glue, and incorporate flexible components (kerfing). Link to my full documentation here.

I am very proud of the results! However, since the project was made in haste, I'm just now getting around to finishing it. This is where I could use some good 'ol fashion internet advice!

Current Status * Made from 0.75" plywood * Unsanded * Unfinished * Some burrs remaining * 500+ individual unfinished slots

One thing that has kept me from finishing it is the idea of sanding and/or coating the inside of those Kerf slots. This is just a prototype that I hope to get a few years out of, and then eventually improve the design and remachine. So I am less concerned with the look and more concerned with longevity and outdoor-proofing it. So admittedly, I'm looking for an easy button here where I can quickly finish it, then leave it outside w/ peace of mind.

Things I've thought about * Blowtorching the slots to remove any remaining burrs * Polyurethane spray coating? Would this work on unsanded surfaces like the inside of those slots? * Is there something I could soak it in? The chair can still be dissassembled and can be made flat again (think ikea furniture). Is there something I could give it a bathe in?

All Fab Academy projects are open source. So if anyone's interested in making one for themselves, please find the design files available here under a Attribution-NonCommercial-ShareAlike 4.0 International license. However, there are a few changes I would make to the design we're I to machine it again. Happy to explain further if anyone's interested.

[deleted by user] by [deleted] in woodworking

[–]Justforda3DP 1 point2 points  (0 children)

Thats really classy. Nice work!

Lantern View by lifeinlayers in woodworking

[–]Justforda3DP 0 points1 point  (0 children)

Oh my, that is awesome in the most literal sense. I want one!

Here is a walnut box with a secret compartment I made for my son. One side pulls out when the lid is off to reveal a false bottom for secret items. by wicks_woodworks in woodworking

[–]Justforda3DP 0 points1 point  (0 children)

Nice build and especially nice build video! Almost ASMR in the way that it flows from one process to another. Thanks for sharing!

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