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Part 15

Part 15

Meanwhile the electromagnet has also been attached and the final measurements have been made. Connecting the shutter lever to the magnet was especially difficult. Because the fixed connection did not hold up to the great acceleration of the magnet, I had to insert a pretty tight spring there that I had taken out of the old Compur shutter. This spring took up the greatest initial pull. The position of the anchor was also critical. Since the anchor could move farther than was necessary, I could divide up the shift. The return of the anchor to close the shutter also had to be carefully adjusted. A small braking zone had to be made to contain the vibrations. This I did by inserting a small rubber ring around the anchor.

The final results were surprisingly good. An activation pulse of 6 msec by the magnet at 47V completely opens the shutter in 6.20 msec. This was measured via the flash signal. After 11 msec, the shutter was completely closed. That is 1/90 seconds, not excessive, but workable seeing that the diaphragm must be closed. The diaphragm is now set via the lens ring to F16 or F22 according to the camera ---since there are no cpu contacts between the lens and the camera. Now, if an object comes between the lasers, it shows up in the photo. Previously the object fell beyond the image. Now I just have to finish the new cables with bolted connectors, build the 47Vsupply into the module, and then we can go into the field and show that everything works.


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