Making a Track Dolly To attain some degree of professionalism with shots you often need a smooth tracking shot because simply panning the camera looks decidedly amateur. A dolly that runs on wheels is not that expensive to purchase but it really only of any use on a smooth indoor surface. The only way to get smooth tracking shots outdoors is to use a dolly that runs on rails that can be laid down over rough terrain to get that shot you really need.
Using wheels at 45 degrees By mounting sets of wheels at an angle, they will not only run on a smooth surface but will also run perfectly on most types of tube too. Our simple to make PVC tube dolly uses inexpensive skateboard wheels to construct a dolly that will run on most tubes from 25mm up to 100mm and is simply and cheap to build too!!
Here's what you need :
Simply bolt the wheels onto the brackets and fasten onto the block of wood with a hole thru the centre. You need a total of 4 sets. Make up a "T" shaped PVC frame using the pipe so it's slightly larger than your tripod. Cut the 30mmx30mm timber into short lengths and drill a hole the same size as the threaded rod thru them. These are pushed onto the rod that goes thru the PVC pipe to keep it central. Boly everything together and make 3 holes in the pipe frame so your tripod drops into them. (My tripod has a hook on the centre post so a simple elastic arrangement down to the PVC pipe stops the tripod from jumping out)
Lay your pipes down and the dolly will run as smooth as silk. For rougher terrain you will have to add a few timber "sleepers" under the track to keep it stable.
Making a Lens Hood for your Camcorder
For some unknown reason I could NOT buy a simple lens hood for my camcorder and decided that I would be charged a small fortune for it if I eventually found one!! Heres how to make one for almost nothing!!!
COMPLETELY free and COMPLETELY effective!
Stabilizer Parts:1 ball-bearing, 1/2" I.D., 1 3/8" O.D. (sold by California Caster as a bearing for a wheel)
The hinges allow the camera to pitch forward and back, and roll left and right. The ball-bearing allows rotation around a vertical axis. I cut about 3" of 3/8" all-thread rod and bored a hole in the top of the wood handle to receive this rod. The top of the rod has two nuts which capture the bearing, with the 3/8" reducer insert. I didn't need to use the washers shown in the parts photo. The wood handle is shortened and sanded down from the original shape.
Saw off the threaded part of the PVC fitting and put it in the oven at about 200 F to soften it. When it is slightly soft, press it over the bearing- it should fit tightly. (My fitting is deformed due to overheating- I practically melted it.)
When cool, use a hacksaw to cut a slot to receive the lower tab of the hinge, and also make diagonal slices off the top edge to allow the hinge assembly more freedom to tilt over left and right. Then, mount the bearing on the threaded rod and epoxy the PVC fitting on top of the bearing. I drilled two 1/8" holes in the fitting and used two bent lengths of 1/8" brass as retainer pins to hold the hinge assembly in place. This is just for ease of reconfiguration and disassembly; you could also use bolts, or epoxy. The 1/2" aluminum tube sections running forward and down from the camera platform terminate in wood blocks which were bored lengthwise with the 1/2" drill. The tube is held in the blocks with transverse 1/8" brass pins.
After assembling the stabilizer, you have to balance it by selective addition of weights. Fix the handle in a vise, place the camera on top, and start adding counterweights to the front and bottom blocks. You can see bolts and an iron washer taped to these blocks in my top photo. You can also move the camera back and forward for fine adjustment. Note that the LCD screen position, wide-angle lens attachment, and battery are all factors which affect balance point. Having achieved a good balance, mark the correct point and drill a 1/4" hole for the 1/4-20 bolt which matches the camera's tripod mounting socket. If you're going to use different batteries, lens adaptors, or cameras (!) you'll probably need to drill different holes, as well as adjust the counterbalance weights.
The bearing has more turning resistance than the hinges, but the final assembly has enough inertia that I get very smooth motion on all three axes. My two-hinge gimble design puts the forward-back pitch axis (upper hinge pin) about 3 mm above the side-to-side roll axis. You can actually feel this difference when balancing: when you add weight so that the overall center of mass coincides with the lower pivot, the stabilizer is neutral for side-to-side roll motion (you can tilt it to any angle and it stays there), but it still has a restoring force in the pitch direction (release it from off-vertical and it swings like a pendulum). If you make the pitch direction neutral, the roll axis is overbalanced and the camera will tend to roll over. In any case, I find the design is useful, and I was impressed by my test video walking around indoors- on playback, the camera really seems to be floating through the air.
By the way, you can use any materials you want. I just happened to use what I did because that's what the hardware store had. I did intentionally choose aluminum tubing because I wanted the whole thing to be as lightweight as possible, so I used a lightweight frame, and just added the minimum counterbalance weight necessary, exactly where needed.
There is something of an art to balancing this (or any other) stabilizer. You add weights to the front elbow and the bottom of the arm until the center of mass of the entire camera+platform+arm+weights is just a millimeter or so below the hinge pivot point, and centered on it so that the camera does not tend to rotate forward, back, or to the side. At that point, it will be just barely stable, almost wanting to tip over, but any hand motion will not much affect the aiming of the camera. You can "steer" the camera into a turn by swinging the bottom of the handle part left or right. If your camera rocks back and forth when you come to a stop, you probably have too much weight on the bottom; try removing some until the camera starts to tip over, then add a tiny bit back.
This stabilizer (and any other one) is best used with wide-angle shots only.
I have used an external wide-angle adaptor. You will need to balance the assembly
with the adaptor mounted, of course.
Steady on!
Steps :
Notes :
