Re: 24Volt DC Unimat Motors
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Thanks for that?Giorgio! I made a translated copy of the PDF for anyone that either doesn't speak the language or is not sure how to translate it.?
Paul
On Mon, Apr 22, 2024 at 7:44?AM Giorgio Traversa via <gtraversa= [email protected]> wrote: Ciao. Secondo me le cinghie rotonde in PU vanno benissimo. Io uso quelle. Un pregio importante del motore DC da 150 W ¨¨ quello di poter variare la velocit¨¤ in un intervallo abbastanza ampio senza diminuire troppo la coppia. Con una puleggia fissa sull'asse del mandrino e tre pulegge intercambiabili sul motore io ottengo velocit¨¤ da circa 350 a pi¨´ di 4.600 giri. Allego PDF.
Il giorno lun 22 apr 2024 alle ore 05:23 Keith S. Angus via <keithsangus= [email protected]> ha scritto: I don't believe the change to timing belts is necessary with modern polyurethane belts, which have plenty of grip. I'm pretty sure the Vee belts fitted to many SLs in the 1970s were fine too, but you can't get them any more. I still find, even with a 24 V motor and speed controller, it's most useful to change the belts to vary the speed. When I fit the DC motor to my U3 I will probably make a set of pulleys as well, to give maybe four basic speeds, but I have a scheme in mind to add a real back gear as well to extend the to lower speeds. I will probably use a 150 W motor. The usual type is a simple bolt on replacement.
For the drive belts I might try the small Vee belts fitted to many sewing machines, but that will mean having a tensioning lever in the drive, so it can be slackened off to move the belts around.
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