First really succesful item cut on the chinese laser cutter. I wanted to make a really cool case for my widows phone using the k40 laser that at last I have setup correctly, but thats another story!
Step one measure the phone accurately twice, including where all the camera and other holes are located.
Now we drew it up in coreldraw allowing for the thickness of the material we are using which in this case is 3mm ply. Make sure you print on paper and check all positions and that it opens the way round you expect, i didn't so had to adjust on the fly some of the hole positions. The hinges were copied and adjusted from the snijlab ones on thingiverse.
Next we saved as a dxf and transfered to the wonderful moshidraw software. Loaded the ply, checked the laser was running and pumping correctly, turned on the air assist and hit cut, on ours thats at 10mm/s.
It took quite a while to cut due to all the slots in the hinges.
Once cut we lightly sanded the edges, stained with something dark and lacquered to give a nice finish, not to heavy so as not to affect the hinges.
To assemble we glued in the spacers and 4 3mm rare earth magnets, slid in the phone and were ready to go.
A nice bonus feature we didn't expect it that squeezing the hinge in you hand opens the phone case.
Though this silent shooter throbs with electric power, it’s based on just about the oldest ballistic principle on record—the one that helped David clobber Goliath with a sling: pick up a missile, spin it to gather force, then let go. Wham!
Not that this cannon is any giant-killer. We kept it small to be on the safer side. But it’s a great demonstration of centrifugal power, and it’ll shoot a BB 25 or 30 feet at a muzzle velocity of around 25 feet per second. This may set you thinking of the potential of a centrifugal gun whirled by a gas turbine at, say, 20,000 r.p.m. With an effective wing radius of about 6 in., you’d get a muzzle velocity of over 5000 f.p.s.— better than a high-powered rifle!
The spin mechanism is simple and cheap to build. The toy motor is mounted by soldering its lugs or bushing (or both) into a hole in the bottom of a cellophane-tape can. The rotor that’s spun by the motor shaft consists of a base plate to which is soldered a short tube, bent and slotted to allow free passage of the BB shot. This unit must turn without binding; the pickup spike must pass freely through the end slot. Bevel the opposite end of the tube flush with the top of the can cover.
The end of the magazine tube is undercut and bent so the dropping BB enters cleanly into the whirling pick-up tube. A large paper clip provides wire for the trigger. Pulling back on it releases one shot while blocking the others. This lets the rotor recover its speed between shots.