Please look at the old floppy drives. The motors are typically almost cubes 40 to 50 mm on a side. (There are exceptions of various kinds so try again if the first one you look at is not suitable.)
I have a few nice steppers which are flat disks less than 20 mm thick, if my memory is failing me, but maybe 60 or a bit more in diameter. However, these have lots of steps (400 to 500) and need only two phases to drive them. (I would offer you one except the postage is terrible from here!) Unfortunately, many 500 step motors are 5 phase models; good stuff but not convenient for this application. The steppers in 3.5 inch floppies are tiny but I would not bet on their ability to drive what you have in mind at the speed you want so I would avoid them unless you are quite adventurous! How fast does one of these cameras complete a sweep? Besides steppers, normal motors run at pretty constant speed if the load stays constant. You must just keep the voltage constant. There are some tiny motors with gears in dead CD drives. The voltages are low so battery power is little problem. Bob At 22:49 26.09.02 +0200, you wrote: >Thanks Bob and Huw . > >Well I know a little about electronics, they were part of my studies >but it's a bit far away now :o) >I got a few step motors but from old printers they are really huge >ones and from the scanner that broke up it's a 7.5 degrees.... I can >gear it with all the pulley and belt I collected from various things >but.... well in fact I've got to test different solutions because I >do not want a 20 pounds camera (without the battery ) ! :o) > >( Well after that I'll have to do a led enlarger for panoramic shots >!! ;o) ) > >Cedric > >On Wed, 25 Sep 2002 22:51:47 +0100, Huw Finney wrote: > >Hi, > >Stepper motors can be geared and it works very well, take a look > >inside > >a printer (to be found in your local skip (dumpster)) there is > >usualy a > >couple of big steppers and some gears and a very useful toothed >belt. > >There are plenty of stepper driver chips out there. If you get > >stuck on > >the electronics I can sketch something for you. > > > >Huw (of LED enlarger fame) > > > > > > > >_______________________________________________ > >Cameramakers mailing list > >[EMAIL PROTECTED] > >http://rmp.opusis.com/mailman/listinfo/cameramakers > > >-- >Cedric Malitte, [EMAIL PROTECTED] on 26/09/2002 > > > > >_______________________________________________ >Cameramakers mailing list >[EMAIL PROTECTED] >http://rmp.opusis.com/mailman/listinfo/cameramakers _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
