CNC Finger Joint Box


(Jeff Peters) #41

Will, I have a program written by a college student that will work in Vcarve pro to do finger joints in the ends of wood being held out side of the front of the shapeoko.
It uses that lau file.
If it would be something that might help in designing your I will share it with you.
Jeff


(William Adams) #42

Thanks! Glad you’ve got something which works for you — I need to work up something which doesn’t depend on commercial software — pretty much there, just need to find time to update the file to handle all four boards at once.


(Jeff Peters) #43

Well I have the program but not sure how to use it yet.
I was trying to find somewhere that the was a video that showed the joints being cut out in front of cnc .
I hope you find time soon, I have something I want to produce to sell that is going to have finger joints on all 4 edges and a dado for a back and a dado for a thin piece of plexiglass
Thanks Jeff


(William Adams) #44

I show a board clamped to the front of the machine at:

Currently trying to finish up the design for the fixture — need to work up a pair of parts which can thread up/down the rod and provides a threaded connector at a right angle — been looking through image searches, but not quite finding exactly what I want, so will probably have to either design something, or work up a design which uses an off-cut from the board.


(Jesse Glessner) #45

Hey Will: How about your original design lid with an extra piece added. Some design, maybe a dragon, that can be either glued, doweled, or screwed to the lid - to be used to just lift the lid up.


(William Adams) #46

That’s a great idea! I’ll see what we can do to add a lid/knob. Thanks!


(William Adams) #47

Okay, here’s the first part of the fixture — cut two of them, the top three holes are used to mount it to T-track (or adjust the spacing to match threaded holes/inserts)

The lower holes have a hex cap nut epoxied into the top, and 1/4"-20 threaded rod installed from the bottom — then cut a pair of boards w/ holes drilled in them which match the spacing of the two fixture boards, slide them onto the rods and use wing nuts to position them to match the board lengths.

There should also be 4 small pieces which have a vertical hole drilled through them, a pair of slots to hold a square nut, and holes drilled into either end which line up with the nuts — use plastic bolts to hold them in place on the threaded rod from one side, and adjust a bold in the other to hold the boards vertically, with two offset by half the board thickness.

cncfingerjointbox_fixture_main.c2d (22.1 KB)


(William Adams) #48

Managed to get two sets of parts cut:

Which shows more or less how it ought to work.

Not included in the photo are three additional boards (all four would be cut at the same time) and a front cross bar which the two F-clamps would hold in place to clamp the four boards, and a set of adjustable clamps which would hold the boards from side-to-side (still need to cut those, but not convinced of the design yet).

The brass nuts are speed nuts from:

https://www.garrettwade.com/frame-clamp.html

and ideally I’d have a bunch more of them.

A nicer version is available from:

http://www.leevalley.com/us/wood/page.aspx?p=31162&cat=1,43293

(but of course, I just missed free shipping, story of my life)

cncfingerjointbox_fixture_secondary.c2d (14.7 KB)


(William Adams) #49

And finished the first of the four adjustable clamps:

(The X-Acto knife has a razor saw blade which I’ve found very useful for cutting tabs)

Here’s a Carbide Create file to cut one, along with a fixture to hold a 1/4"-20 square nut to use to drill the holes in the ends for the nylon bolts (each mates up with a square nut, one holds the fixture in place on the threaded rod, the other allows one to adjust for placement of the boards.
cncfingerjointbox_fixture_3_sideclamp.c2d (15.2 KB)


(William Adams) #50

Everything goes together to look something like:

I will note that using wingnuts is very tedious, so placing an order for more speed nuts now.

Hopefully this weekend I can find time to cut some boards to length and then put the fixture to use.


(Jeff Peters) #51

Is the program done, ready to set up the cut files.
Jeff


(William Adams) #52

Please download and try the OpenSCAD file above — set up a particular size / style of box and I’ll run out some files for it.