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powermatic 90 lathe speed , pulleys

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Forum topic by ibewjon posted 07-05-2014 02:33 AM 1020 views 0 times favorited 20 replies Add to Favorites Watch
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ibewjon

32 posts in 1536 days


07-05-2014 02:33 AM

I recently purchased a powermatic 90 lathe. I cannot get the speeds listed in the manual, so I am wondering if the machine has the correct motor pulley and belt. What diameter should the motor pulley be, and how long should the motor belt be? This info is not listed in the owners manual I have. I cannot get the speeds listed on the tag on the machine. And if anyone has the size for the reeves drive belt, please post that also. Thanks, Jon [ the motor is 1725 rpm 1 hp.]


20 replies so far

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mhermann

4 posts in 558 days


#1 posted 07-06-2014 03:00 PM

The motor you describe is the same rpm and horsepower the lathe originally came with. Those lathes also came with a reeves drive that consists of two spring-loaded expanding pulleys, one on the motor and one on the spindle. Rotating the speed control lever on the front of the lathe will expand and compress those pulleys to get you your variable speed. If your lathe has step pulleys in place of these, then that would be the reason why you can’t get the required speeds.

The belt that came with this setup is a flat-ish belt. I dont have the number handy.

Hope this helps.
—Mike

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mhermann

4 posts in 558 days


#2 posted 07-06-2014 07:56 PM

The stock belt number is 1422V360 which is a 36” belt. I found replacements online pretty easily. This belt won’t do you any good though unless you have the stock pulleys.

—Mike

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ibewjon

32 posts in 1536 days


#3 posted 07-07-2014 12:23 AM

thanks for the reply, however i forgot to post that mine has the intermediate shaft between the motor and spindle pulley. these reeves drive pulleys are original, but i do not know if the belt is stretched or worn. the pulley that i am questioning is the motor pulley, the 1/2” pulley on the mid shaft appears to be original. My motor is mounted in the base cabinet on a hinged plate. Any ideas? jon

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Rick M.

4466 posts in 1123 days


#4 posted 07-07-2014 04:40 AM

How far off are the speeds and how are you measuring them?

-- http://thewoodknack.blogspot.com/

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ibewjon

32 posts in 1536 days


#5 posted 07-07-2014 03:13 PM

for speed measurements, i am using a friends’ penn state digital tach, maybe not exact, but i only need close. with a 2 3/4 inch motor pulley, which came on the machine, the lowest speed was 750 rpm. i changed to a 1 3/4 inch pulley, and got the speed down to 450, but the highest speed is now down to 1240. [i know that speeds change on both ends when changing a pulley]. i saw a picture of a 90 with a factory sticker that gives speeds for various diameters, from 200 for 12” rough, to 3000 for some finishing. the book i downloaded shows speeds for the machine from 500 – 4000 rpm, however i do not know that it is for my machine. my serial # is 390111, the 3 should be for 1973, the 90 is the model, and 111 is the machine. the book says it is for # 1000 and up, so my 111 may need a different book. i wish that powermatic would have given part sizes instead of just part #s is their books. is there any help anyone can give me with this?

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rick1955

59 posts in 174 days


#6 posted 07-07-2014 06:02 PM

Why do you not call Powermatic???? I know they don’t make that model anymore but someone there should be able to trouble shoot your problem.

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ibewjon

32 posts in 1536 days


#7 posted 07-07-2014 06:12 PM

just figured i would get a better answer here than india, or wherever the call center is, but i can try it. thanks

View Wildwood's profile

Wildwood

1231 posts in 878 days


#8 posted 07-07-2014 06:37 PM

Hard to answer your question because some models shipped with a 1800 RPM and guess some came with 1725 Rpm or switched later. Know lathe speeds normally shown on the speed shift lever.

Can only guess motor mount is hinged to make belt change simple, and you have something called a jack pulley in that reeves drive motor set up. One other advantage turners like about these lathes is installing a foot clutch to change speed or stop lathe without using the shift lever or on off switch.

Del Stubbs, demonstrated & explained foot clutch set up & operation on a General reeves drive lathe in his Bowl Turning video.

Back when your lathe was made could bring the old belt into any store selling belts for a replacement. That may or may not be true today.

Today common for folks to remove the reeves drive and modify lath into EVS adding new motors, inverter/controllers set ups.

-- Bill

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ibewjon

32 posts in 1536 days


#9 posted 07-07-2014 07:14 PM

there are no speeds marked on this model. the belt is easy to find, but i do not know if it is stretched. even powermatic can not tell me the size of the pulley, but they did send me a manual from a newer model, and three speed ranges were available, but no pulley size is listed. changing to a vfd is no problem because i have been an ibew electrician for almost 40 years, i was just hoping not to have to spend money for a drive, i would rather buy tools. i will find the answer somewhere. thanks for the help. jon

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rick1955

59 posts in 174 days


#10 posted 07-07-2014 07:17 PM



just figured i would get a better answer here than india, or wherever the call center is, but i can try it. thanks

- ibewjon

Whatever would make you assume their tech help is in India??

always start with the manufacturer for tech help…
Technical Service
1.800.274.6846 – 8:00 a.m. to 5:00 p.m. (CST, Monday – Friday)

View mhermann's profile

mhermann

4 posts in 558 days


#11 posted 07-07-2014 11:21 PM

If you want tech support, go over to owwm.org and post your question there. There are four or five active guys who have worked over multiple 90s and would be happy to answer your questions, plus there are easily a dozen more guys like me who own and use them. That’s where I get my info for old machines, and that’s where I would go to get my problem solved. Be sure to have a couple of pictures handy also.

—Mike

View Bill7255's profile

Bill7255

200 posts in 1028 days


#12 posted 07-07-2014 11:58 PM

I have a PM 90. When I got it it had a 3 phase motor which I changed to single phase. From what I remember their were two speed versions. 1000-4000, and 500-2000. They had different speed handles. Mine is the 500-2000 version. If there is something you want me to look at on mine let me know. I am sure it still has the original belts. Post a picture of yours.

-- Bill R

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ibewjon

32 posts in 1536 days


#13 posted 07-16-2014 10:57 PM

from what i have been able to locate, powermatic shipped lathes with different speed ranges, so it looks like none had the entire speed range, but each had different portions of the range available. at least now i know that mine will not make the entire span, and i will set it up for the low range, and if i ever want the higher speeds, i will change the motor pulley. thanks for all the help and advice.

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ibewjon

32 posts in 1536 days


#14 posted 08-08-2014 01:30 AM

with the speed problem solved, i was wondering if anyone has heard of having a machine shop cut the drop bed into a 90 lathe that did not have one. it looks like a slot could be cut, even if not the full 2 1/2 inch depth that was in the original. it looks like it could be cut as deep as the reinforcing ribs that are cast into the bed. or is this a bad idea? would it be better to get riser blocks made, and higher tool rests to match?

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Bill7255

200 posts in 1028 days


#15 posted 08-08-2014 12:15 PM

I am no expert on these lathes, however I did some research when I acquired my PM 90. It would be helpful if you posted a picture. From my research only the first year(s) of these lathes did not have the cutout. If it were me I would not want to modify the lathe casting, keeping it original. Riser blocks is what I would do to gain the height. Does your lathe have a SN plate?

-- Bill R

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