Affordable Video System for Turning Demonstrations1

(Note: this is a work in progress and I'll be adding to it as things develop.
If you want be kept up to date e-mail me and use VIDEO SYSTEM in the subject line)

You may have seen or read about this Audio / Video System the AAW used at the 2012 San Jose Symposium - a very slick set up for demonstrations - and something every turning club could use. But at $750 (plus shipping) just for the frame, our little tuyrning club of about 70 members can't afford the FRAME, let alone the rest of this system.

BUT . . . WHAT IF . . . there was a more affordable DIY set up - that was easily transportable - and stored?

Since Digital High Definition TV has come along, there are plenty of old video cameras sitting in the back of closets, some accompanied by a seldom if ever used anymore tripod. A movie screen shouldn't be that hard to come up with either. Two old Standard Definition video cameras, two unused tripods and a movie screen shouldn't be that hard to come up with. And little flat screen displays like those used in car systems can be picked up for about $50. Old SD video projectors can be had for a song too.

This is exactly what Richard Scott, of Silicon Valley Woodturners, was thinking. As a former owner of a video production company, he had much of what might work - two video cameras on dollied tripods, a video camera on a dollied overhead boom arm, two heavy duty stands, an overhead beam, clip on photo floor lights and all the clamps to hold things togethern - along with a LOT of wires. This is the basics of Richard's set up. Not shown is a roll around cart with two 17" monitors and a video switcher connected to a video projector hung from the ceiling of the meeting room - and a movie screen.

Here are a few shots of the actual set up in use.

The boom camera operator also doubles as the director, monitoring the feed from all three cameras, switching which camera is feeding the projector and what the audience sees. He's also wearing a wireless headset, as is the other camera operator so he can direct the floor camera operator. The demonstrator is also wearing a wireless lapel mic - though not really needed since the audience is live, not that far away and can hear what he's saying without amolification

In the shot below, notice the roll around metal cart with two large monitors, below them, two small monitors, C-clamps and the jumble of wires and cables

While this set up works, it has some "challenges", It requires three people to operate - and coordinate with each other, It also requires about an hour to unload , unpack and set up and another hour to take down, pack up and load up. It also has LOTS of loose components, parts, cables and wires. Misplace or damage anything - and you're screwed.

There had to be any easier system - one that was simpler, easier to set up and tear down, was more easily transported and stored - and needed only ONE person to operate,

A/V SYSTEM CRITERA:

- INEXPENSIVE (older pre-HDMI video cameras with remote for zooming, used tripods, small flat screen displays, hardware store materials)
- quick to set up and take down
- easy to transport and store
- keeps everything together and protected when not in use
- operated by ONE person who can zoom each camera in and out and switch which camera's view the audience sees
- light enough for one person to get major components in and out of a truck or van
- small enough when packed up to fit through an exterior door opening and go up and down stairs
- only four wires from Director's Station to Frame - extension cord & three video cables

Here's the idea I came up with for the FRAME - 7' tall, 51" wide and about 24" deep. With the 7' uprights removed,the top and bottom frames join together for transporting and are a bit over 2' x 4' and 16"tall - easy to transport and store.

Here's an On Line source I found doing a Google search for "canopy fittings".

A trip to my favorite ACE hardware store for six 10' long 3/4" EMT conduit - for $30 and some hack sawing got me the straight parts, with some left overs. Another trip to a local Flea Market and about $40 got me all the connection fittings. Some hacksawing, a little assembly and I had THIS. Weighs under 20 pounds and assembles in minutes

Knocked down, the frame takes up a space about 2' x 4' x 16" high. Two 20" x 48" folding tables, parts of this Video System, fit within the frame.

Now I needed something to clamp to the frame and to hold a camera's tripod's head and shaft . Once again, I found what I needed at my favorite ACE Hardware store - clamps for temporaily sealing a hole in a water pipe. Rubber on the inside, springy metal on the outside and a nut and bolt to close the clamp. I added tge Wing Nut so the clamp could be tightened by hand rather than with a wrench (one less thing to lose). I super glued the nut on the end of the "bolt" so the wing nut can't come off - and get lost. A couple of blocks of wood, some screws and I had THIS. These clamps were $8 a pop and the wing nuts were another $1.50 - but they work great. They clip on and off quickly, no threading pipes through them required, hold well and are relatively small and light.

Add the clamps price and we're at about $120 for the system, so far.

Here's a camera, tripod head clamped to the overhead conduit frame.

Now about the tripod head in the above photo - used pan/tilt head tripods with removeable camera mounting plates can be had for under $20 at flea markets and on-line., Make sure you get the detachable mounting plate. Without it, the tripod head is useless, 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Here's a SketchUp version of what this would all look like when set up for a demonstration. The frame and all the attached STUFF can be assemble on the ground and then stood uppright. YES - the short widith diagonal is 92", LESS THAN NORMAL CEILING HEIGHT OF 8''.

THAT's important. The short side diagonal can't be more than 92"!

So now we've got a FRAME, three mounted video cameras, two mounted lights and a power strip to plug cameras and lights into. Camera 3, the front view wide shot camera, is optional, the overhead view and tailstock view cover the important stuff.

Now to looking at the Field of View of the two fixed location video cameras.. Each must, when zoomed all the way out, show the area in which the turning tool is used so you can see both hands of the turner and the end of the turning tool handle over its range of motion. Each should also be able to zoom in enought to fill the screen with a space 6" x 6" for close up / details shots.

To check the field of view of the tailstock mounted camera, I set the camera up on a tripod so that it's about 45" above the ground and 52" inches from the back end of what would be the headstock. Here's the range of this location's field of view. That's about an 8" long by 3 1/2" diameter blank in the picture with about a 1" diameter tenon on this end. The hallway in the photo is 45" wide and the foam board under the tripod box is 20" deep and 30" wide. The "blank's" centerline is about 35" off the floor - about where a lathe's centerline would be.

Note that in the above Field of View photo, the camera remains in a fixed position and merely zoomed in and out - no camera movement. An overhead camera mounted above and slightly forward of the headstock should have a similar field of view range, allowing for a wide shot that shows the tool from tip to end of handle. With two fixed cameras, each with its own remote zoom, one person can control both cameras AND switch which camera's feed is sent to the video projector.

With the FRAME and cameras out of the way, the next part of the system is the Director's Station. Three video monitors, one for each camera and one for what will be sent to the video projector, two video feeds in, one video feed out SWITCHER, space for a laptop, a power strip with five, preferably six outlets for the monitors, laptop and a few spares, and some place to store all this stuff (cameras, cables, extension cord, lights, clamps, etc. when not in use).

I have a light folding tables 20" deep and four feet long that would be perfect for the Director's Station. Half inch ply to go on it, two boxes fixed to the ply, one box with a tilt up hinged lid to house the small monitors, power strip, power transformers and AV cables, another with a slide off lid to put the laptop on and house the cameras, lights and clamps and cables-

I've put tpgether a YouTube video on the first cut at this video system. CLICK HERE to see it.