Is this possible with a CNC machine? - Router Forums
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post #1 of 15 (permalink) Old 09-21-2019, 02:56 PM Thread Starter
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Default Is this possible with a CNC machine?

Hello - newbie here. Disclaimer that I don't own nor have I used a CNC machine. I'm trying to come up with a solution for a tedious process and wonder if a CNC could work for this. Rather than explain (and bore everyone) with too many details, I'll just try to explain what I'm trying to accomplish. I work with bamboo-like tubes that are quite small (about 10-12mm in diameter). I then split the tube into thirds lengthwise so that I get a section of the tube/cylinder that is about 8mm wide and 3 inches long. The inside of this tube (the flesh) is then gouged out so that what remains is a thin piece of bamboo which maintains the original diameter of the initial section I split from the tube. It is gouged out in a way that leaves the center of the piece (down the length) at about .60mm and it gets gradually thinner from the center to the sides of the piece. I may be totally off base here, but as far as the carving out the center of the piece goes, is this something a CNC machine could do with precision? Would be be possible to have the program cut in such a fashion that gives the exact thickness (.60 mm etc.) measurements I've described?

I would post photos but as a newly registered member I can't yet. If what I've described makes sense to anyone please let me know if a CNC machine could be used for this.
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post #2 of 15 (permalink) Old 09-21-2019, 03:10 PM
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Hello and welcome to the router forum
You can post pictures provided they are on your computer hard drive you cannot use a link

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post #3 of 15 (permalink) Old 09-21-2019, 04:09 PM Thread Starter
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ok great below are some photos. The first photo is of the piece before the "flesh" is gouged out. This is how it would look before doing anything to it on the CNC. again, about 8mm wide by 3 inches long. The other photos show finished pieces so you can get an idea of the curve that remains and the thinness.
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post #4 of 15 (permalink) Old 09-21-2019, 04:33 PM
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welcome to the forums N/A...
a ball bit and router table w/ feather boards can give you what you want..

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post #5 of 15 (permalink) Old 09-21-2019, 04:48 PM
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Welcome to the forum, Pat! Add your first name to your profile so it shows in the side panel and clears the N/a. Add your location, as well.

Yes, a CNC can cut that but the bigger issue is figuring out how to hold these small pieces. I suppose you can cut them long and clamp them to a fixture or the spoilboard...

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post #6 of 15 (permalink) Old 09-21-2019, 05:14 PM
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Yep. Tapering them is no problem for a CNC, but rather for the person trying to clamp them onto the bed of a CNC without the hold downs getting in the way of the cut. A little custom suction jig perhaps. If mass producing them is your desire, then I'd make 2 racks for holding several each. Fixture on the CNC bed to hold a rack. Let it cut one rack's worth while the second is being loaded with blanks. Swap out racks.

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post #7 of 15 (permalink) Old 09-21-2019, 06:07 PM
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CNC machines are expensive. Both methods offered by others will work. It will just depend on how many and how fast you want to make them. For about a hundred or less I would just go with a router table, feather boards, and maybe some guides, plus a pushing device to feed the pieces through safely. The quality will depend a lot on how accurately you can prepare the blanks for size to match your setup and router bit.

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post #8 of 15 (permalink) Old 09-22-2019, 06:49 AM
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I believe so with an indexer. I just started playing with Shopbot's handibot.
Here is a FB post show carving a skull.
https://www.facebook.com/scott.grove...7615352933777/
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post #9 of 15 (permalink) Old 09-22-2019, 08:15 AM
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How are you currently removing the material? With something so thin, tearout may be a real problem.
As other have mentioned, holding them down will be very difficult. What I'd do, is rough cut the blanks long, so you can make a fixture to hold them at the ends. Then, after machining, trim the ends to length.
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post #10 of 15 (permalink) Old 09-22-2019, 08:34 AM
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Welcome to the forum
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