CNC Table Clamps

Source files covering everything from cabinets in the kitchen to creepers in the garage (attachments of gcode, 3d models, or other related material).
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CNC Table Clamps

Postby jackspace » Sun Jan 22, 2012 3:40 pm

On Thingiverse there are HUNDREDs of items that can be fabricated on a 3D printer, and a few items that can be made on our Zen CNCs. One such item is the CNC Table Clamps project: http://www.thingiverse.com/thing:776

Of course the project only provides a DXF file. I'm a bit of a newbie to working with those files, so no doubt there are better ways to do this. I took the DXF file into HEEKSCAD, eliminated the largest size of the three, scaled the rest down so the clamps would be around 4 inches long, rotated it 90degrees, and double checked that the hole is indeed 5/16" so I could use a wooden dowel to fasten the halves.

CNC_Table_small_Clamps_fixed_scaled_by jackspace.dxf
DXF file
(33.31 KiB) Downloaded 495 times


I brought THAT DXF file into CAMBAM 0.82 (and let me say that version is rough around the edges but I simply can't afford to spend more on software), and set it up to do the round holes as a machining profile, then a pocketing profile, and then machining profile to cut the clamp itself out. If I had the moolah, I would splurge and get Cut3D by Vectric.com which makes it really easy to add cut-out tabs to hold your part in place; BUT I just cut the whole thing out and the sawdust held the part in place mostly.

CNC_Table_small_Clamps_fixed_scaled_by jackspace.cb
CamBam file
(29.28 KiB) Downloaded 299 times


OK, from CAMBAM, I created the tooling profiles. I used the 1/8" endmill sold by ZTW for the whole job. For material I used 1/2" plywood (I could have easily used 1/4", just know this G-Code is for 1/2") on my ZTW 12x7x5.

I use EMC2 to control my CNC so I opened the G-code in it and went from there. I pretty much ran 12 inches per minute for the whole thing and it did just fine. It took about thirty minutes to run the whole thing.

Image
EMC2_screenshot by jackspace, on Flickr

Here's the G-Code:
CNC_Table_small_Clamps_fixed_scaled_by jackspace.ngc
G-code file
(107 KiB) Downloaded 313 times


What you get are four pieces: two for a big clamp and two for a small one. Give them a light sanding and glue them together and insert your bolt and knob/nut/wingnut and you have a pair of handy CNC Table Clamps, which you can replace when you run your router over one by accident by just cutting some new ones out:

Image
CNC Table Clamps by jackspace, on Flickr

Cheers!
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jackspace
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Posts: 16
Joined: Mon May 23, 2011 1:55 am
Location: Northern California
Zen Model: Zen 0712 (Ext. Mod)
Other CNC Info: Started on 7x12 5inZ June 5 2011

Re: CNC Table Clamps

Postby roller » Sun Jan 22, 2012 8:36 pm

Jackspace - take a look at HeeksCAD and HeeksCNC as a free alternative to CAMbam.

Your output looks rather rough - is that just the photos or are you not getting smooth output from your Zen. You might need to tweak you cut speed and depths a bit.
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roller
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