On Monday 30 November 2020 09:54:13 Todd Zuercher wrote: > The main problem is that you keep trying to run these cheapo 24000rpm > spindles at speeds less than 9000rpm for extended time periods. Of > course you're going to have trouble cooling it, (or have much usable > torque.) They are made for wood carving, not milling metal.
You are right about the cheapo's, I don't think I'll get a 100 hours out of this one, at 75 or thereabouts hours, it sounds like its grinding up the bearing cages already. Not built to carve 1/2" alu although it did a fine job, very good finish with a 4 flute 1/8" uncoated carbide tool plowing out the outline of these motor mounts, with the mister working, Digging .75mm deep per pass at 350mm a minute and 14 to 15 thousand revs. But I was hearing more than tool noise at the end of the second mount. Then my stepson came down from Maryland to spend Sat afternoon with me, and I spun it up to about 8 grand for him and was not impressed by the noise, its close to done. But I have a good 4 bearing 250 volt version and a higher voltage vfd to match coming. Cooling didn't seem to be a problem as it didn't heat more than 10C over room during those two 24 minute jobs. The new one s/b here by Pearl Harbor day. Making a home switch mount for the BS-1 can wait, or can be done on the GO704 as theres some room left on the end of its table if I absolutely must be doing something. So the short life of this one, even if it had been carving wood, is not exactly news. This machine was a prime example of BBLB as the first thing I did was throw away ALL the electronics including the box. With decent drivers, those itty bitty motors can do 190 ipm for XY but the z is still puny at about 35 going up. I'm hoping it can lift the longer, heavier new motor. Out of the box? About 7 to 10. Plug in the A and it dropped like a rock. The supply, supposedly 24 volts, was folded back to 14 with 3 motors plugged, and about 6 with the A plugged in. With Mach3 running it, then with linuxcnc, the vfd ran the spindle in a random direction. I asked the guy to refund the cost of the electronics ($500) and got told off. So I thought I'd make a decent machine out of the raw material. This motor is just part of that effort. Next is thicker X rods as I expect someone has that spot on the shelf filled since this mill is a bit famous for needing that. It will get done if I don't stop using air. At my age? All things are possible. Thanks Todd. > Todd Zuercher > P. Graham Dunn Inc. > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 > > -----Original Message----- > From: Gene Heskett <[email protected]> > Sent: Wednesday, November 25, 2020 9:38 PM > To: Enhanced Machine Controller (EMC) > <[email protected]> Subject: [Emc-users] Changed mind on > motor, now for sale > > [EXTERNAL EMAIL] Be sure links are safe. > > Greetings all; > > I bought a good 4 bearing motor to replace the partially blocked water > cooled 1.5KW motor that came on the 6040 mill. But thinking on the 110 > volt version's performance at the lower revs, and the flickering of > the lights when its running slow, I've decided the 2.2KW version is a > bit much for the 120 volt wall plug wiring it my garage. > > I am adding a 250 volt run to the machine so I can use a 220 vfd and > motor, and ordered that same motor and its matching vfd for 220 volt > service. > > So these two motors will be for sale along with a 1.5kw vfd, all for > 110 volt service. The OEM motor has about 20 hours service on it, the > good one is some what unpacked, repacked and brand new. The vfd has > been reprogrammed to properly drive the OEM motor. It does that very > well down to about 1000 revs. > > I've got $160 in the new 4 bearing 2.2kw & the $125 vfd has a few > hours on its capacitors, estimated 5 year life, so make me an offer if > you can use them. > > Thanks everybody. > > 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 > > > _______________________________________________ > 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
