Clamp for Light Stand • Video

Clamp on EMT
Clamp for Lamp Stand
Clamp on EMT Stand
Clamp for Lamp Stand
Light Stand Clamp Video


G-Code, DXF and Printable Templates

The template can be printed on 8½ by 11 inch paper. It is sized on a one to one scale.
The scaling can be checked with the dimensions of the bounding box on the template.
The gcode and dxf files work on my systems but they may not be compatible with others.

Video Transcript

This video is about a clamp that holds a boom to a stand that is made of EMT.

The clamp adjusts the angle, height and rotation of the boom. The first prototype worked well, but it was clunky. The second used thinner stock and served well. It used nuts rather than wood to hold the EMT clamps in place.

The one shown in this video is made of aluminum, but ones made of 1/4 inch hardboard work fine.

The templates on my website can be used with wooden stock rather than aluminum.

The parts are simple and can be cut by hand just about as quickly as they can be CNC cut.

A six inch section of 2 x 1/8 inch aluminum flat bar is screwed to the CNC table bed. The screws are as near the corners as possible.
The template is placed over the aluminum and used to determine the origin. 0,0,0 is the center of the disk.

The axes are zeroed, the template is removed, and the dust shield is installed. The holes are drilled and recessed. An M0 code is in the gcode to stop the machine so screws can be driven into the center of each part.

The stock is small and hold down bridges are more trouble than they are worth. The cut is resumed and the parts are cut.

A quarter inch bit is used because it is available, inexpensive and more forgiving of mistakes than smaller bits.

The screws are removed to to release the parts. Again, these simple parts can be cut by hand just about as quickly as the machine can cut them.
Half inch EMT clamps are attached to the aluminum. The tab on each clamp has to be removed. It can be filed, sanded or ground off. A flat head machine screw is tightened to the clamp with a nut and washer.

Two clamps are attached to the rectangular plate. Nuts and washers sandwich the plate and hold the clamps in place. The clamps are aligned so the EMT easily slides through them. Two clamps are also attached to the disk. The screw heads are in the recesses that were cut in the the aluminum.

A quarter twenty threaded rod is tightened to the disk. Nuts sandwich the disk. Thread locker can be used to secure the nuts.
The remaining plate is attached to the threaded rod on the disk. Washers and a 5/16 inch nut, which acts as a spacer for the knob, are installed.

There are knob gcodes on my site. A wing nut will also work. The second set of clamps is installed on the rod and tightened into place.

This simple low cost unit permits angle, height and rotational adjustment, and it has served well in other applications.

There is more information on my site Thanks for watching!

Construction Notes

The ¼-20 rod is ~4 inches long. Its length depends on the size of the knobs and the thickness of the stock.
The screws are flat head #8-32 x 1¼ inch.

The extra threads can be cut after the unit is assembled. One inch screws are a fraction too short. Longer hardware will be needed with ¼ inch stock.

Video Notes

There are three YouTube videos in the light stand series. This page is the second with the clamp information listed above.

The lamp stand, the lamp stand clamp, and the counterweight on YouTube work with half inch EMT.