On Tuesday 25 June 2019 00:20:29 Bruce Layne wrote: > The 2.2 KW water cooled Chinese spindles that I have are apparently > dynamically balanced. There are two machined divots of different > depths in two flats on the ER collet nut, apparently to remove > rotating mass to balance the spindle. 24000 is a lot of rippums. I > guess they assume the collet nut will be indexed to the same place > each time relative to the spindle? Or did they balance the spindle > somewhere I can't see and then balance the collet nut? It looked like > a lot of material to be removed to balance only the nut. > Perhaps you have forgotten that the ER style nut is a loooong ways from symmetrical internally?
My guess is that the spindle is balanced w/o the nut, and that the nut is separately balanced. Or should be... > On 6/25/19 12:01 AM, Thaddeus Waldner wrote: > > . > > > >> On Jun 24, 2019, at 12:50 PM, andy pugh <[email protected]> wrote: > >>> On Mon, 24 Jun 2019 at 17:29, Todd Zuercher > >>> <[email protected]> wrote: > >>> > >>> As far as I know the ER collet holders on these things are always > >>> integral. I have one that ER11 that has a setscrew in the sleeve above the slinger flange, But I've never loosened it, just made sure it was tight. The other looks like it may be a shrink fit. Both run very close to true. > >> For fixed tooling I can imagine making a solid piece to fit the ER > >> cavity, retained by a ring-nut. > >> > >> Or maybe dismantle and re-machine the shaft. I think that these are > >> typically plain induction motors, so disassembly and reassembly is > >> pretty straightforward. > > > > Before you dismantle a high speed spindle, be aware that some are > > balanced after assembly. I have a nice 3hp 18,000 rpm air-cooled > > Elte spindle. I had the idea of removing the fan and replacing it > > with something quieter that is thermostatically controlled, since I > > use it mostly for engraving. I called up a stateside distributor and > > their tech guy told me that the company bolts the fan in place, then > > balanced the entire rotating assembly > > > > > > _______________________________________________ > > 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
