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General Mach Discussion / Re: anyone know where to get an optical edge finder?
« on: December 05, 2006, 11:43:45 AM »
This is what I am using, it is a $19 usb camera, it will focus up to 1/8" from your target ( maybe even closer, I haven't tried closer because it blocks out all the light the closer you get). I mounted it on a shaft with three adjustment screws. All you do is chuck it up in your spindle lower down to your target and get it focused. Then first time you need to center it, do this by adjusting the three screws so
that when you rotate the spindle 360 deg by hand, the crosshairs stay in the exact same position. When that is done you have a mighty fine optical positioning device. I attached a picture of the camera, note the adjusting screws. Also is a screen shot of the actual video window, it is focused on a metal ruler, mm scale, the lines are 25.4 mils apart.
that when you rotate the spindle 360 deg by hand, the crosshairs stay in the exact same position. When that is done you have a mighty fine optical positioning device. I attached a picture of the camera, note the adjusting screws. Also is a screen shot of the actual video window, it is focused on a metal ruler, mm scale, the lines are 25.4 mils apart.