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Forum topic by Gunslinger posted 08-19-2014 12:58 PM 1597 views 0 times favorited 16 replies Add to Favorites Watch
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Gunslinger

17 posts in 855 days


08-19-2014 12:58 PM

Good Morning
To revive a post from the past, I am restoring a delta / rockwell 37-315 8” jointer and in need of finding a replacement pulley for the motor as well as a single phase equilivent motor for a three phase 1.5 hp unit which came with the unit. Any help will be appreciated.

-- AL, Alabama


16 replies so far

View ChrisK's profile

ChrisK

1809 posts in 2549 days


#1 posted 08-19-2014 01:16 PM

http://www.sawmillcreek.org/showthread.php?75540-Rockwell-Delta-Jointer

Found this link which links to some pdfs of the manuals.

Any brand of 1.5 hp single phase will work. You will need the same type. Check Grainger or McMaster-Carr for the different types.

-- Chris K

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BinghamtonEd

2281 posts in 1837 days


#2 posted 08-19-2014 01:38 PM

+1 for McMaster Carr (LINK).

What about a VFD for the existing 3PH motor?

-- - The mightiest oak in the forest is just a little nut that held its ground.

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David

198 posts in 2131 days


#3 posted 08-19-2014 01:43 PM

Ebay is also a decent source for motors and pulleys, as long as the final cutterhead speed is the same as original you don’t need the exact same size pulleys.

-- Perilous to all of us are the devices of an art deeper than we ourselves possess. --Gandalf the Grey http://davidwahl.org/category/woodworking/

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Gunslinger

17 posts in 855 days


#4 posted 08-19-2014 01:44 PM

Thanks Chris, Ed I concidered that option, but the motor is three phase 490 volt.

-- AL, Alabama

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Gunslinger

17 posts in 855 days


#5 posted 08-19-2014 01:46 PM

(Correction) Fingers got in the way. Thanks Chris, Ed I concidered that option, but the motor is three phase 480 volt.

-- AL, Alabama

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Gunslinger

17 posts in 855 days


#6 posted 08-19-2014 01:48 PM

David, is there a formula for computing this?

-- AL, Alabama

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ChrisK

1809 posts in 2549 days


#7 posted 08-19-2014 03:44 PM

The RPM of the new motor should be close to the RPM of the old one. 1750/1800 and 3600 ares pretty typical.

The cutter speed in inches per minute would be cutter diameter in inches times RPM times pi times pulley ratio

I will use 6” for the cutter diameter 6 X 1800 X 3.1416 X 1=33929 inches per minute. This assumes that the pulley on the motor is the same diameter as the pulley on cutter head. If the pulleys are different you need to know there diameters. (The actual pitch diameter is what you really want to use, but the od will be close enough).

Say the motor pulley is 6” od and the cutter head od is 3”, there will be a two to one increase in the speed of the cutter head. If the motor pulley is 3” and the cutter head pulley is 5” you need to divide 3 by 5 for .6 reduction in speed of the cutter head. You do not want the cutter head spinning too much faster than the factory design. The head could fracture sending large metal bits flying. You also want to match the pulleys to keep the torque on the shafts within original design loads.

-- Chris K

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ChrisK

1809 posts in 2549 days


#8 posted 08-25-2014 02:53 PM

Gunslinger, did this help?

-- Chris K

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Gunslinger

17 posts in 855 days


#9 posted 08-25-2014 04:11 PM

Sorry for not getting back with you, but had to deviate my attentions to shop storage for a minute. Yes, it helps, but what I am having difficulty with is the motor pulley is a 3.5” pulley and the cutter head pulley seems to be in the 1.5-1.75 range. I am going to have to check it to be sure. The motor is three phase 480 running at 3450 rpm which I want to convert to a single phase 120 / 240v unit.

-- AL, Alabama

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ChrisK

1809 posts in 2549 days


#10 posted 08-25-2014 04:55 PM

Can you measure the pulley at the cutter head? The motor should be no problem to find. Match the 3450 rpm and HP rating and shaft dia if possible. The motor current will be much higher than the 3 phase motor. I would wire for 240 and provide a 20 amp breaker for it, that will provide plenty of current for quick starts.

http://www.mcmaster.com/#5990k27/=tfoimz

McMaster is not the cheapest, but a good place to check details.

-- Chris K

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Gunslinger

17 posts in 855 days


#11 posted 08-25-2014 08:36 PM

Measured the cutter pulley and it came out as 2.25” diameter. I will check with mcmaster for a motor. Thanks for the help.

-- AL, Alabama

View rick1955's profile

rick1955

258 posts in 898 days


#12 posted 08-26-2014 01:06 AM

Surpluscenter.com

-- Working smarter with less tools is a true crafts person...

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bigblockyeti

3668 posts in 1188 days


#13 posted 08-26-2014 03:32 AM

For greatest accuracy, the pitch diameter is what you need for you’re calculations, there are many online belt and pulley calculators online. I use Amazon for most of my pulleys and belts.

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ChrisK

1809 posts in 2549 days


#14 posted 08-26-2014 04:42 PM

Gunslinger, can you determine what belt type it is? 4L, A, 5L,or B? You also need to make sure the pulley you buy has the correct bore dia and key or set screw mount.

I have used surplus center in the past. They can have some good deals. Grainger also sells this stuff, there may be a store near you and you look before you buy. You can look into a linked belt to replace the V belt. The pitch diameter varies quite a bit for the same pulley OD versus belt type.

http://www.mcmaster.com/#v-belt-pulleys/=tg6tde

-- Chris K

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Gunslinger

17 posts in 855 days


#15 posted 08-27-2014 12:18 AM

Thanks Rick, Chris I have the old belt, but with it being possibly 10 years old and used quite a bit I don’t know about identifing the type except it is a v belt.

-- AL, Alabama

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