IIRC, Monarch threw all the silly stuff out and used AC motors + VFDs for the late 10EEs. Supposedly 7.5hp w/ backgear, 10hp w/o. Im sure a 5+hp ac system would beat the stuffings out of one of the orig monarch drive systems.
CNC spindles do need to change speed rapidly for facing using CSS. Also, inverter drive induction motors can do 3:1+ constant hp range. Eventually the rotor inductance causes the speed^2 term to catch up but it can be way out there. A DC motor is a mechanically commutated AC machine. There is nothing performance-wise it can do better than an electrically commutated AC machine. Stephen On Mon, Apr 29, 2013 at 1:36 PM, Steve Stallings <steve...@newsguy.com>wrote: > > > > -----Original Message----- > > From: Jon Elson [mailto:el...@pico-systems.com] > > Sent: Monday, April 29, 2013 1:00 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] converting Monarch 10EE > > > > andy pugh wrote: > > > > > > It has to make more sense to couple a 3-phase motor and > > > single-phase-input VFD directly to the spindle? > > > > > The motor is an odd frame, and also has MASSIVE torque at low > > speed. So, the 10EE has no back gear. It probably works MUCH > > better at low speed than a VFD and typical 3-phase motor. > > You could make an argument for a DC drive for the motor, but > > that could be a major project, and not a good one if you aren't an > > electrical engineer. > > > > Jon > > The 10EE does utilize a DC motor with impressive low speed > torque, but it none-the-less does have a backgear. The gear > assembly is on the end of the motor, not in the headstock. > > See this photo: > > < > http://www.google.com/imgres?imgurl=http://www.practicalmachinist.com/vb/at > > tachments/f10/19126d1263689447-backgear-monarch-10-ee-3-hp-motor-back-gear.j > > pg&imgrefurl=http://www.practicalmachinist.com/vb/monarch-lathes/backgear-19 > > 6511/&h=768&w=1024&sz=76&tbnid=v8fc691q6yRUYM:&tbnh=102&tbnw=136&prev=/searc > > h%3Fq%3Dmonarch%2B10ee%2Bback%2Bgear%26tbm%3Disch%26tbo%3Du&zoom=1&q=monarch > > +10ee+back+gear&usg=__Zttj_U5_FmZ9wlMHQYqmIwTmtFA=&docid=beP_ccGHfzktLM&hl=e > n&sa=X&ei=0q1-UaaxBonc2AXar4HoBA&ved=0CD0Q9QEwAQ&dur=5072> > > Sorry for the run-on URL, but I could not find a shorter one. > > Steve Stallings > > > > ------------------------------------------------------------------------------ > Try New Relic Now & We'll Send You this Cool Shirt > New Relic is the only SaaS-based application performance monitoring service > that delivers powerful full stack analytics. Optimize and monitor your > browser, app, & servers with just a few lines of code. Try New Relic > and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
