| Author | Message | ||
     Old_school Tinkerer Username: Old_school Post Number: 10 Registered: 04-2011 Rating: N/A |
Just looked at a galvanometer in a battery tester & they are in oposite directions, looking direct on & through to the other side. Use a low watt soldering iron. To keep the coil from moving on you very carefully wedge a V shaped piece of paper in between the magnet & the coil, a number 5 or 3 point tweezers works nice for the delicate work here. Usually, I take notes as to the direction the coil is going before attempting any work. Anyway, if the hairspring is in good shape & your going to reattach it, with your elbows on the corner of the bench for stability, proceed. The soldering iron may attract the hairspring so have a good firm grip on it & see how it goes. Try to get it so it is flat, level & concentric to match the other side. If all goes well, remove the paper wedgie & balance the pointer. ? Yes, move the adjustment so the pointer is not on its stop, free floating, check for position error. Up, down, left, & right, add a little bees wax if needed to balance or spot of paint a little at a time as it should not take much if all goes well. When balanced, return to the zero reference position & calibrate. I was only able to get one gal in a shop of about 60 to even attempt this so, be patient & take it slow. Some of the movements had three hairsprings, fun! Ref: why not? http://en.wikipedia.org/wiki/Galvanometer If you have a broken taught band, the material is platinum & we never repaired these, just replaced them @ $1000. a pop. So if you have a broken taught band movement, before you pitch it, grab the taught band material off it first as it could come in handy. |