Easy Hold Down Table

discussion of design changes / improvements / suggestions
JuKu
Posts: 69
Joined: Sun Sep 02, 2012 2:55 pm

Re: Easy Hold Down Table

Post by JuKu » Tue Dec 18, 2012 8:02 am

edwardrford wrote:Which steel clamps? Something like this:
We're selling them now through inventables: https://www.inventables.com/technologie ... down-clamp or you can google for them.
Yours is still by far the most suitable that I can find. Could you start selling the captive nuts, too? It is not that easy to find US hardware on this side...

deejayspinz
Posts: 96
Joined: Wed Oct 17, 2012 9:33 am
Location: Burlington Ontario, Canada

Re: Easy Hold Down Table

Post by deejayspinz » Tue Dec 18, 2012 1:10 pm

For what it's worth, I used simple "L" brackets and some 1/4" bolts into my MDF/t-nut as hold-downs


Image

edwardrford
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Re: Easy Hold Down Table

Post by edwardrford » Tue Dec 18, 2012 1:12 pm

Here are the captive nuts. I have them listed as t-nuts, because that seems to be the industry standard. These are 6 prong inserts that do a nice job biting into the MDF.

Also, there are pre-cut 12"x12" pieces of 3/4" MDF here if you're interested in that.

While I'm plugging the store, I might as well mention we have the hex caps for the thread inserts :-)

-Edward
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PsyKo
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Location: France

Re: Easy Hold Down Table

Post by PsyKo » Tue Dec 18, 2012 1:42 pm

Those nuts are also called Claw Nuts.
I will use them in my 35mm Oak table.

Hope this will do it :)
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cvoinescu
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Re: Easy Hold Down Table

Post by cvoinescu » Tue Dec 18, 2012 4:48 pm

@JuKu: This side of the ocean, M6 tee nuts are the standard (M8 are also available, but M6 in Europe is like 1/4" in the US); you can also find M6 screws with a wide, flat head and a hex socket (like the one in deejayspinz's photo) in many different lengths, quite cheaply. They are called joint connector bolts or cross dowel bolts (because they mate with the cross dowels). Very handy when building your own furniture, too.

Edit: my link is to a fairly crappy tee nut; I found nicer ones on eBay. They're still 4-prong, but more carefully made. I can dig up the link if anyone needs it.
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roberlin
Posts: 59
Joined: Tue Apr 10, 2012 12:12 pm
Location: Baton Rouge, Louisiana

Re: Easy Hold Down Table

Post by roberlin » Tue Dec 18, 2012 8:01 pm

For Americans with a metric fetish (like me), it looks like bolt-depot has the T-nuts in a range of sizes
http://www.boltdepot.com/Metric_T-Nuts_ ... steel.aspx

jrsteensen
Posts: 118
Joined: Mon Jun 11, 2012 9:29 pm

Re: Easy Hold Down Table

Post by jrsteensen » Thu Jan 24, 2013 3:27 am

Awesome idea!!!

One thing you can do to fill holes in MDF and restore it is mix a little elmers glue and a little handful of sawdust into a paste, and then fill the holes with it. It gets the wood good enough to put screws back into.

jzhvymetal
Posts: 21
Joined: Thu Nov 22, 2012 1:36 am

Re: Easy Hold Down Table

Post by jzhvymetal » Wed Feb 06, 2013 1:48 am

Attached is DXF for hold down clamps

End Mill:= 1/8"
Material:= Cutting Board 13mm thick or 3/4" wood along the grain
Drill Holes:= 1/8" for wood you will have to drill out the hole larger for wood or it will crack.
Pocket Holes Depth:= 4mm
Screw:= #8 x 1" wood screw
Dowel:= 3/4" dowel


To put together use a larger dill bit to counter sink the screw head. Alternate the screws one on each side. Cut dowel to size and insert to the clamp. Drill a hole small pilot in the center of the dowel then drill a larger hole using a 1/4" bit.
Hold down clamp.JPG
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HoldDown_clamp_MM.dxf.txt
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Last edited by jzhvymetal on Wed Feb 06, 2013 3:18 pm, edited 1 time in total.

iconeo
Posts: 27
Joined: Tue Aug 28, 2012 7:58 pm

Re: Easy Hold Down Table

Post by iconeo » Wed Feb 06, 2013 8:30 am

I found some t nuts at home depot.

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jzhvymetal
Posts: 21
Joined: Thu Nov 22, 2012 1:36 am

Re: Easy Hold Down Table

Post by jzhvymetal » Wed Feb 06, 2013 1:41 pm

You can find T-nut almost any hardware store. My local Menards had them in packs of 25. They where the 4 prongs which did not hold well. It does not matter when the board is flipped they bite down when you use them for clamping. As a side not I found the 6 prongs ones from McMaster-Carr http://www.mcmaster.com/#90975A153 hold in place better and over all cheaper if you need many of them. I am lucky to have a McMaster-Carr Will Call close to me.

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