Re: [CAD_CAM_EDM_DRO] Re: Miracle Motor

turbulatordude wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me" <cnc4me@g...>
>wrote:
>
>
>>Well, my take on this is you are running a 260V motor on 80V or 70%
>>less voltage...If that isn't derating, i dont know what is...
>>
>>
>>Wally
>>
>>
>
>The $29.99 motor is 110VDC, not 260V so his reduction is much less.
>
>also, the $9 motor does not have roller bearings.
>
>Neither do the $19 or $21 motors.
>
>

OH OHH! The sleeve bearings may do fine as a spindle motor, but I think you
will have short life as a positioning servo motor with these. They may
still last several
years in a home shop application, but in commercial use they might only
last months.
The constant low-speed and reversing action will prevent good
lubrication of the
shaft.

>So, the $9 motor is the 260 volt one, without roller bearings.
>
>the $29 has roller bearings and is listed at 110 volts.
>$29.99 p/n 10-1573
>
>

That, righ there, would be a big factor. I just don't want to mess with
sleeve bearings
in an application like this.

>Also, you are correct that the numbers don't add up.
>
>the $9.99 motor is listed as a 2-1/4hp at 260 volts @ 5 amps
>260 times 5 = 1,300 watts
>1,300 / 748 = 1.73 hp
>
>
>

That 2.25 Hp may be a peak rating, not continuous.

Jon