Maybe the (excess?) noise is from the belt and pulleys not matching.
On Sun, Jul 3, 2022, 4:59 PM Chris Albertson <albertson.ch...@gmail.com> wrote: > The best information about timing belts will come from the belt > manufacturer's web site or from a belt reseller like https://sdp-si.com/ > SDP-SI <https://sdp-si.com/SDP-SI> has a lot of good theory-based > articles on belts and belt tension > and so on. > > One thing to know is that the older belt designs used trapezoid teeth. The > new ones use rounded sine wave shape teeth. The new belts make less noise > and are stronger for a given size and can get by with less tension. If > noise is an issue, you might change the belt, but that means also changing > both pulleys > > On Sun, Jul 3, 2022 at 1:23 PM John Figie <zephyr9...@gmail.com> wrote: > > > I am back to making slow forward progress on the Clausing NC since > > putting on hold back in March. The lathe came with the 5HP motor > > already mounted and I have kept this as is from the previous owner > > that gave up on the retrofit. The original lathe had a mechanical > > variable speed drive with pulleys similar to that on a bridgeport > > variable speed head. I have mounted and wired up a Huanyang 7.5 Kw VFD > > for the motor and first ran the motor today. I am using a 7.5Kw > > inverter to allow for derating for single phase per Huanyang > > recommendations. > > > > I have about 1" of deflection in the belt. The belt seems quite noisy > > when running the motor at 1725 RPM. I have not yet attempted to run > > the motor at 3200 RPM which is my goal to get 2000 RPM spindle. > > > > Are these kinds of timing belts usually noisy? > > The original clausing manual says have 1" of belt deflection - but > > they don't specify a force. Also the original timing belt was probably > > about 3/4 as long as the one I have now because of the way the > > variable speed drive was mounted. There isn't much clearance between > > the belt and the z axis motor like 1/4" but increasing that clearance > > would make less clearance to the spindle drive encoder (not mounted at > > the moment). > > > > https://photos.app.goo.gl/hSYW84zZsdnoKdr79 > > > > Motor running at approx 1725 RPM > > https://photos.app.goo.gl/FxjZn6QRmztM1TQk8 > > > > John Figie > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
