I made a little fixture recently to make a production job easier, but in
order to use it I need to clamp it to a table. I can't leave it
permanently affixed as I only need to use it for a few hours once per
I can't use typical C-clamps because they would interfere with the
operation of the thing. So, I'm envisioning a couple of these things,
permanently screwed onto the bottom of the tooling plate. Seems like
they'd be available off-the-shelf, but you know how it is when you go
searching for stuff. If you don't know the terminology, it's tough. So
does this type of clamp have a name? McMaster has about 9 million
different categories of clamps listed, and I ran through them to the
extent of my patience.
Sure I could roll my own, but I hate making stuff when I could just go
out and buy it. Any leads appreciated ...
Plug "table clamps" into google. Usually made for a specific fixture.
Only one I have around here is for the round fluorescent magnifier on
an articulated arm I sometimes use for close work.
But it's cast with a hole for the arm base.
Beat me to it- that sure looks like a beam clamp. Various sizes and
flavors available at most electrical supply houses. Note well that the
ones for conduit are usually intended for static loads, though, not
pounding or vibrations.
How mad will somebody get if you put 3-4 holes in the work table? Bolts
and wingnuts over big washers on the bottom side come to mind....
Pictures of the fixture and the work table would be useful.
if this is made of cast alumimum or zinc, you could saw cut off the
part you dont need & go from there.
If it's cast iron or steel you could still cut away the unnecessary
I'd be guessing but I'm thinking the grip depth is about 7/8" or 1"
which would make the "top surface" ~2.5" or so?
this one gives some dims in the spec tab
1.5" wide x 3 " long with a nice rectangular mounting surface
I don't know what you're clamping down, or what tools you have, but
I'd probably make my own up from bar stock how thick you want.
Then you get exactly what you want.
Even without a press the bends can be done in a vice by heating first.
Cut a piece of hardwood square as a fixture to do the second bend.
Drill and tap your holes first because heating will probably harden
the metal when you quench it, which you should do.
But I'm not sure, since I forgot my heat treating.
Got a Rockwell tester?
Depending on how much clamping force you need, the big weakness
of typical screw clamps is the swivel - it only grabs a small area.
That damn magnifying lamp is hell to get secure on a table.
The force applied by moving the arm wants to break it loose unless you
really crank it down hard.
If I wanted to get a real secure bite with the kind of lockdown you
*might* be wanting, I'd drill for 2 screws/bolts, and also cut to size
a piece of bar stock to slip on top of the screws, and the screws
would push that against the table underside.
You could glue a piece of sandpaper or emory cloth on the clamping
surfaces too, or dimple them..
That's probably what I should do with my magnifier clamp.
Glue on some sandpaper. I'm using it on slick finished tables.
Don't care if they get marred a bit where I clamp it on.
Thanks. I think you solved my problem.
re: "That damn magnifying lamp is hell to get secure on a table."
I tossed the clamp and drilled a hole in the top of my workbench along
the back edge.
The post that used to go into the clamp is shoved into the undersized
hole to hold the lamp up.
I swing it out from the back wall when I need it and give it push back
when I'm done.
My lamp has a hinged cover over the lens to keep the dust off of it.
I've found that it only works if I actually remember to close it. ;-)
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