Thanks. Good suggestions and warnings. Is it possible to mill the profile with the pulley horizontal? I guess it depends how thick the pulley is and how long a small end mill can be without breaking. I'd guess the standard way is rotary indexer with pulley face vertical and ball mill. My 3D printer is at the low end of the scale for quality and although I use it for all sorts of things, I wouldn't use it to make a 3000 RPM pulley. Attached photo shows a 6 part print holding a Servo Motor, Planetary reduction drive coupled to another reduction drive for ultimately turning a lever through 105 degrees. It's a simulation of the real thing so the plastic is only used to duplicate the end product. Works fine. Who cares if it's a bit rough.
John > -----Original Message----- > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: July-25-20 10:28 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Quiet toothed belts. > > Yes, The the best and newest tooth profile the GT3 from Gates. These are > quiet and have there smallest backlash and also the smallest belt tension > requirements. > > Running a pass of a ball nose might make a working pully but the profile > will not be exact. If you must MAKE a uleey the trick is to go the the > SDP/SI web sight (or McMaster Carr, or whatever) and download a CAD file > for the part. It is easy to mill a pully if it lacks flanges. So make it > in three parts and make some big washers to use as flanges if needed. > You can also print a GT3 pulley. > > Be careful with Chinnese suppliers they abuse the name convention. In > China "GT3" is a GT profile with a 3mm pitch. But elsewhere GT3 is the > profile and you say "GT3 with 5mm pitch and 9mm width" or whatever. > > Just like gears the profile changes with the pulley size because when you > band a belt the teeth point inward depending on how tight you bend the > belt. So if making you own, use a CAD file from a catalog. > > Youcan also buy GT profile bar stock and slice it like bread to make custom > pulleys. Then you get a perfect profiles and any custom hub you like. > > What I do is make a metal hub in steel and then press fit/epoxy a 3D > printed ring of teeth over the hub, These hold up really well and are easy > to make. On a pulley all the stress in on the hub and set screw. The > teeth only need to be as strong as the rubber teeth in the belt, Aluminum > is overkill. PLA works there. But PLA hubs fail very quickly. > > On Fri, Jul 24, 2020 at 12:04 PM John Dammeyer < > <mailto:jo...@autoartisans.com> jo...@autoartisans.com> > wrote: > > > What's the quietest profile/size belt for driving a spindle with 2HP up to > > 3000 RPM. > > > > I recall someone saying the round groove is the best for this. Since > > we've been talking about gear cutters are there special cutters for that > > belt profile available? > > > > Thanks > > John > > > > > > > > _______________________________________________ > > Emc-users mailing list > > <mailto:Emc-users@lists.sourceforge.net> Emc-users@lists.sourceforge.net > > <https://lists.sourceforge.net/lists/listinfo/emc-users> > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > Emc-users mailing list > <mailto:Emc-users@lists.sourceforge.net> Emc-users@lists.sourceforge.net > <https://lists.sourceforge.net/lists/listinfo/emc-users> > https://lists.sourceforge.net/lists/listinfo/emc-users
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