This new instructable will show you haw to build a Laser Vortex with extended range, sharper display, less noise and the ability to create a starburst vortex. You can use this instructable to fine tune your old one or create a better one from scratch but this time you may need to salvage some junk parts or order some materials. You can take it as far as you want.
Step 1: Gather Your Tools & Materials
Six inches quarter round trim
Small piece of laminate flooring (aprox. 5.5 inch by 2 inch)
1/4 inch by 5/16 inch Tee Nut
Insulated alligator clips
3/4 inch first surface/front surface mirror
Mini camera tripod
Precision drive motor and head salvaged from a CD or DVD player
5 mW Green Laser Pointer
One wire tie
Small electrical wire (a 6 foot network cable with the ends cut off works great for this)
Heat shrink to cover the wire connectons
MAKE Controller kit (for the Starburst Vortex effect and power supply.)
Hack saw (for cutting the quarter round trim)
Wire cutters/Side cuts
Drill and 1/4 inch drill bit
Hot glue gun and glue sticks (low temp glue works fine)
Multi-meter (to check connections)
Fire (for the heat shrink)
Step 2: Extra Info About Parts
Precision drive motor and head:
This is used to rotate the mirror mounted at an angle so it continually changes the direction of the laser beam. Any motor will due but one salvaged from a CD or DVD player will have a mounting bracket already attached allowing us to glue the mirror directly to it. These are also small, quiet and run well when hooked up to the Make Controller. By using this particular motor, we get smooth controllable operation reducing vibration that may cause the vortex to appear dull or dim at long range.
1/4 inch first surface/front surface mirror
A first surface mirror is used because the reflective surface is on the front of the mirror. A regular mirror requires the laser pass through the clear glass before being reflected back. Part of the lasers power is diffracted off the surface of the glass before it reaches the reflective back of the mirror. This causes a second beam to reflect off the mirror. You loose intensity of the primary beam and cause a secondary weak vortex to form. The vortex will be weaker and less focused with an ordinary mirror.
5 mW Green Laser Pointer
You can use almost any laser pointer of any visible color for the laser but green is most visible to the human eye. So it is the perfect choice of color. Using one rated at 5mW has plenty of power to get great range but still be safe for people to get close to (within 2 or 3 feet). You can do more with a more powerful laser but we want it to be safe for people to be near. People love to be close enough to touch the vortex.
MAKE Controller kit
We can power the laser and motors off batteries but the MAKE Controller allows us to power everything from its digital outputs and control the motor speed from one place. We prefer to run the motor at the slowest speed while getting a fluid projection to reduce vibration. Also, it allows us to pulse the laser on and off at a high rate of speed to produce the Starburst Vortex.
Step 3: Mounting the Mirror
The disk is often held to the motor with a magnetic clasp. These images show the mirror being glued to the clasp allowing the mirror to be removed from the motor for storage or swapping it for a mirror mounted on a different angle. You can glue the mirror directly to the motor without the magnetic clasp if you don't want the option to remove it.
With your hot glue gun, just glue the mirror to the motor using enough to prop the mirror up at a slight angle. A 15 degree angle or so is all you need and it dose not need to be perfect.
Step 4: The Tripod Mount
Step 5: The Motor Mount
Step 6: The Laser Mount
Mark the place where you will be gluing the quarter round making sure the mirror can spin freely once attached, then glue into place.
Step 7: Attach the Laser
I notched out part a small portion of my base with a Dermel to keep the laser from sliding. Then place the laser on the quarter round pointing at the mirror and held it in place with a wire tie. Clip off the excess part of the wire tie and the laser is mounted.
To hold the button down, you can use clear tape or duct tape, any tape that won't stretch out. Electrical tape will not work for long.
Step 8: Connect Wiring Insulated Alligator Clips
Pick 2 pair and strip the ends to bare wire, I used the green pair and orange pair. Remove the covering from your clamps and place one of the striped wires through before connecting the bare clamp. Connect your clamp and slide the covering back over. Do the same thing to the other side and you're done. The nose of the alligator clips should be the only exposed metal.
Step 9: Connect Motor
Strip the insulation off your motor leads and another pair of wires from your network cable.
Cut a piece of shrink wrap tubing to slip over the wire before soldering the connection, you usually need no more than a half inch of shrink tubing to protect the connection. You must put the shrink tubing over the wire before you solder the connection.
Solder your wires together and slip the shrink tubing over the soldered connection covering all exposed wire. Use a lighter or torch to slightly heat the shrink wrap. It will shrink and protect the connection as it cools. It only take second and it lasts longer than electrical tape on these small connections.
Do the same thing to the other motor lead and you're done with the motor connection.
Step 10: Connect Camera Tripod
Step 11: Connecting to the Make Controller or Other Power Source
Also, I am running the laser at a higher than recommended voltage from the make controller. I took the chance that my laser pointer could handle the 5 volts supplied from the make controller and it work fine for over 3 hours. Be aware that yours may not so there is a risk of toasting your laser pointer but you wont be able to make the Starburst Vortex without it or some other circuit to pulse the laser.
Connecting the Make Controller
Strip the other 4 ends of your network cable and hook up the motor up to digital output 1 and 2, the polarity dose not matter. Hook up the leads with the alligator clips with the positive lead on digital output 3 and the negative lead on digital output 4.
Make sure you have your Make Controller hooked up to a power supply and the USB cable it attached to your computer and the controller. The Make controller should be running the latest Heavy. If you have not yet done this, go to makingthings.com and follow the instructions.
Open mchelper and we will turn on the motor by sending this command to the controller: /motor/0/speed 400
The motor should start to spin. If you want to make it spin faster, replace the ÃÂ400 with a higher value (up to 1023). Replace with a lower value to decrease the speed.
Step 12: Connecting the Laser
Connect the negative alligator clip to the inside spring of the laser pointer, the insulation around the alligator clip should prevent it from touching the outside of the laser pointer.
Connect the positive lead to the out side casing of the laser pointer. Make sure your on button is taped down to hold it in the on position.
Now send command /motor/1/speed 375
The laser should come on and project what looks like a series of lines or dots.
Step 13: Add Fog and Play With Settings
For narrower beams in the Starburst, send a lower speed command to the laser such as /motor/1/speed 300
For wider beams, send a higher value such as /motor/1/speed 450
To change the way the vortex rotates, change the speed of the motor. It only needs to spin fast enough to make the reflected laser beam appear like a fluid circle with the laser turned on but changing the speed will make a change in the beam rotation. Try sending /motor/0/speed 250 and see what you get. There are a lot of deferent affects you can produce with the make controller but changing the laser pulse and motor speed should keep you entertained for a while.
If you have an oscilloscope, you can check the output supply to the laser and see why this happens with different speed settings.