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japcas
09-06-2007, 06:25 PM
I would like to replace the 2HP single phase motor on my 13x40 Jet lathe with a comparable 3 phase motor and run it with a vfd. I'm not sure what motor frame I should be looking for so I placed a sketch of it below to see if you guys could help me out. The tag on the motor doesn't say what frame it is. The single phase motor is a 1750 rpm unit by the way. Thanks in advance for any help.

http://i32.photobucket.com/albums/d39/japcas/MotorBaseplate.jpg

Forrest Addy
09-06-2007, 06:39 PM
There's no info on the label plate?

If its a NEMA motor chances are it's a 182 or 184 frame. If EIC (Metric and the shaft size is very close to 20 mm) you need to get hold of a WW Granger catalog.

Here's an informative link:

http://www.iprocessmart.com/leeson/leeson_iec_article.htm

larry_g
09-06-2007, 06:45 PM
Jon
Your goingto need a lot more information than you posted. Go to
http://www.engineersedge.com/nema_frames.htm
and see if you can match up more information.

I assuming that with the numbers you gave that your motor may be metric and therefore you may have to search out metric standards. Just put "motor frame size" in your favorite search engine.

try here; http://www.metricmotor.com/about_metric_motor.html
lg
no neat sig line

japcas
09-06-2007, 07:02 PM
There's no info on the label plate?

http://i32.photobucket.com/albums/d39/japcas/MotorTag.jpg

I think the motor may be metric but I'd like to use something that may be more commonly found here locally, as in Tennessee. I don't mind having to bore out the motor pulley if I have to. I just don't want to redrill and tap the back of the lathe headstock to mount a different motor. I do have a Grainger catalog but didn't realize they had that kind of info in them. I'll take a look and see. The shaft size and key size noted were actual measurements taken from the motor so I know they are right.

Forrest Addy
09-06-2007, 08:56 PM
It's right there at the bottom: "Made in China." I don't know if they subscribe to IEC standards but I think they do sometimes.

I wonder what "Heat 70C" means. Izzat temp rise?

japcas
09-06-2007, 09:11 PM
I went back and added another dimension that seems to be critical. The shaft to base height. I'll continue to check the sites you guys listed.

Forrest, sorry about the china thing. That just happens to be what the lathe came with. I'd be happy to find something that is real close. I don't mind opening up the holes on the motor base plate a little but I'd rather not have to drill and tap the casting if at all possible.

Oh yeah, sorry about the crappy drawings. I'm no artist.

http://i32.photobucket.com/albums/d39/japcas/motorspecsheet.jpg

h12721
09-06-2007, 09:22 PM
Go to " http://www.leeson.com/products/techref/iec.htm "

All the frames are listed.
Hilmar

wierdscience
09-06-2007, 10:07 PM
.747" is 3/4" most likey since .787 is 20mm,but the .237" key is 6mm where on a 3/4" shaft it should be .1875(3/16").

I also noticed the motor base slots are running the wrong way in the picture.Is that a mistake in drawing or do they actually face that direction?If they do face that way then it's a total bastard and you may as well start from scratch.

Ausserdog
09-07-2007, 01:18 PM
Looks kinda like a bastich to me.

Just for reference an IEC motor (metric) frame number is based on the nominal dimension of the height of the shaft center from the foot mount in millimeters. In this case 4.225" x 25.4mm/in = 107.3mm. Standard frame sizes would be D100 and D112, take your pick. Shaft diameter for either of those is 28mm with an 8mm key.

If you go strictly by shaft size the D80 is closest with a 19mm shaft with a 6mm key.

If you go by rated output the standard frame for 1.5kw is D90. This is for a 50hz motor with an output speed of 1450rpm (1740rpm @ 60hz). A D90 uses a 24mm shaft with an 8mm key.

A NEMA 182/184T frame motor has a shaft height of 4.5" with a 1.125 diameter shaft with a .250 square key. Nominal horsepower for this size is 3hp for a 182T frame and 5hp for a 184T at 1800rpm. The only other difference on the 182/184T is the bolt hole spacing: 4.5" for the 182T and 5.5" for the 184T. Since most of the dimensions are the same, many of these have the feet drilled for both sets of holes and are dual frame marked.

HTH

(Corrected for spelling errors)

japcas
09-07-2007, 07:51 PM
.747" is 3/4" most likey since .787 is 20mm,but the .237" key is 6mm where on a 3/4" shaft it should be .1875(3/16").

I also noticed the motor base slots are running the wrong way in the picture.Is that a mistake in drawing or do they actually face that direction?If they do face that way then it's a total bastard and you may as well start from scratch.

I checked again on the motor Darin and the slot direction that is noted on the drawing is correct. I guess this really is a bastard motor. Thanks for the help.