On Saturday 02 January 2021 12:56:40 Chris Albertson wrote: > The noise is caused by tooth shape. I think the sound is caused by > air getting pushed out of the grove in the belt and pulley and very > high rates and then the teeth slamming together. A lower precision > printed pulley would interlock tighter with the belt. The slamming > would be a little harder. If noise were important, you would select > a more modern rounded tooth shape. Profiles like GT2 have less noise > and less "slip" and a bit more strength for the same size belt. and > importantly the teeth don't slam together On these belts the > belt/pulley interface is much like a sine wave rather than a square > wave. > > I run GT2 timing belts as fast as the stepper motor can go and don't > hear any belt noise. All the noise comes from the motor. > That's been my experience too. But because of a lack of holding power, and availability of better 2m542 drivers, I replaced the super small nema23 on the 6040's supplied A axis with a longer, more powerfull 270 oz/in. But the holding power is still inadequate, so my next step will be to turn the motor around so it projects from the rear instead of beside the chuck, and replace the relative large motor pulley with a smaller one and wrapper idlers, and add about 20 teeth to the axle pulley as its way small for the room it has to swing.
I can't imagine ever needing the nominally 20 rpm it can do with the present setup. By putting a 2NM 3 phase on it, I'd guess I'd triple the holding power as it will use whatever current it takes, as opposed to the 2 phase's currant turn down when at rest, the 3 phasers use whatever it takes until they've hit their unstated current limit. Interestingly if you buy the pair from ebay, circa $130 + ship, both the 2 and the 3 come with the exact same driver. Or better yet, make some feet for one of the smaller worm drives so the motor hangs out the side. I have 2 of the medium sized drives but I'm not sure the gantry would clear one of those. Eyeballs, they say no. My biggest problem with those worm drives is the total lack of any means of mesh adjustment to compensate for wear. Ditto for the motor I put on the BS-1. The biggest slop there is in the BS-1, but its worm is adjustable so it at the moment has no detectable backlash. > On Fri, Jan 1, 2021 at 11:54 PM <[email protected]> wrote: > > On 2021-01-02 06:53, John Dammeyer wrote: > > > I have noticed the 3D > > > printed pulleys are noisier than the metal ones. > > > > I wonder whether that is because the surface of the teeth will > > inevitably be rougher than if they had been die-cast or machined? > > > > > But the noisy grind > > > of the stepper motor is also gone. > > > > Got to be a bonus. > > > > > More when it's wired up to LinuxCNC. > > > > Looking forward to that. Following this topic with interest. > > > > Marcus > > > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
