33459Re: Spectacular motor failure
- Jun 17, 2013I converted by Enco version of that mill to 3-phase/VFD. Here are some links to the threads on the conversion.
The bottom line is that you can find a metric motor that drops in other than the shaft size. I had to have the shaft on the Leeson motor I bought turned down and shortened in order to make it a drop in replacement. It cost me about $40 to get it done by an authorized Leeson motor repair shop, thus not voiding the warranty. YMMV
--- In email@example.com, "svsequoia_pdx" <k7cej@...> wrote:
> There I was, drilling a .109 hole in delrin, and BOOM! the magic smoke
> escaped from the junction box on my 2HP RF-45 clone mill-drill. The 150
> uF start capacitor exploded, blowing the cover off the junction box.
> The tattered remains hung there, burning; it took me a few moments to
> get my act together, pull the plug and blow out the flames. Then I had
> to deal with the smoke detector(s), fire alarm company, etc. Picture
> 859749/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc> :
> Since the motor had been running for 30 seconds (but making a slightly
> different noise) the start capacitor should not have been carrying
> current. A quick check with a replacement cap and a clamp-on ammeter
> proved that the centrifugal switch was not releasing at speed.
> The motor is a Chinese YL90L-4, single phase 230V/60Hz, 1740 rpm, 2 HP
> flange mount. Does anyone know of a US source for a replacement? The
> only one I can find is the 3 phase Leeson 192206.00 if I upgrade to VFO
> control. (I did this upgrade on my 10" Grizzly lath
> 4303/pic/list> e and it works well. It's just the $500 or so needed to
> invest!) Has anyone done the 3 ph upgrade? Dop you know if the Leeson
> is a drop-in replacement?
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