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28-350 motor question

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Forum topic by LuBan posted 02-14-2018 04:20 AM 172 views 0 times favorited 13 replies Add to Favorites Watch
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LuBan

13 posts in 492 days


02-14-2018 04:20 AM

Topic tags/keywords: 28-350 delta rockwell band saw motor

I have been in the market for a band saw for about three years. Old iron isn’t as abundant in Alaska. I bought this saw sight unseen. The auctions timing wasn’t great, wife was giving birth that week and couldn’t make the 8.5 hr drive to check it out.

I paid 200 bucks for the saw, and 300 bucks for the transport. The listing said:


Delta bandsaw
No guides on saw
Year: 1988
Serial number: 112-4196

I don’t ever expect the person who lists these auctions to provide accurate or detailed information. By the picture, I could tell I was looking at a 28-350 from the 50’s or 60’s.

Went over to owwm and it looks like a 1951 model. When I got it to the shop today, I saw that the original guides are on the machine and complete. Next I checked the motor so I could order the right VFD. To my surprise, it’s one of the dual voltage 1 hp motors. I have a 1956 unisaw with the 1 hp bullet motor, they look nothing alike. Most of the information that I have gathered was based on the saw having a 3 phase motor.

Does anyone know more about this motor and what is the hp equivalent in today’s standards. Thanks in advance!


13 replies so far

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MrUnix

6351 posts in 2104 days


#1 posted 02-14-2018 04:26 AM

That is a 1954 saw, and it looks like a 1hp single phase motor made by Marathon for Delta – unless I’m seeing things.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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LuBan

13 posts in 492 days


#2 posted 02-14-2018 04:30 AM



That is a 1954 saw, and it looks like a 1hp single phase motor unless I m seeing things.

Thanks Brad,
You were just the guy I was hoping would reply. Will I see a significant power advantage wiring it for 220?

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MrUnix

6351 posts in 2104 days


#3 posted 02-14-2018 04:35 AM

You were just the guy I was hoping would reply. Will I see a significant power advantage wiring it for 220?
- LuBan

None. Also, how did you determine it’s a 28-350? In 1954, they only offered two band saws – and a 28-350 isn’t one of them :) Perhaps you meant catalog number 28-305? Wood/Metal 14” model on an enclosed cast iron stand (28-307 is the same but on an open flared leg stand). Saw itself is a model 880.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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LuBan

13 posts in 492 days


#4 posted 02-14-2018 04:41 AM

I just assumed it was a 28-350. Mainly from pictures, I was in the hospital during the auction (new baby) plus I’ve had limited time to research this saw anymore (new baby)

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MrUnix

6351 posts in 2104 days


#5 posted 02-14-2018 04:54 AM

I just assumed it was a 28-350. Mainly from pictures, I was in the hospital during the auction (new baby) plus I’ve had limited time to research this saw anymore (new baby)
- LuBan

The 28-350 is a 20” wood cutting bandsaw and was not sold in 1954, although it did appear in the 1955 catalog, so maybe yours was a very, very early model – it looks like this (catalog picture):

In 1954, all they offered was the 14” cast iron models, either wood only or wood/metal.

Cheers,
Brad

PS: Regarding the new baby – from experience, if you don’t sell them before they turn 4, you will never get rid of them <grin>

-- Brad in FL - In Dog I trust... everything else is questionable

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LuBan

13 posts in 492 days


#6 posted 02-14-2018 05:02 AM

I agree about selling them before 4. It’s so hard to get rid of something when it’s in its prime. So, what saw did I just buy???

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MrUnix

6351 posts in 2104 days


#7 posted 02-14-2018 05:05 AM

Yup, it’s a 20 incher! Serial number places it as 1954 but they didn’t show up in the catalogs until 1955 – so you apparently got one of the first ones out of the factory. Nice score for what you paid!

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Rick_M

11109 posts in 2285 days


#8 posted 02-14-2018 05:11 AM

Whoa! Is that the least efficient motor of all time or what is going on?

115/230 V
14.6/7.3 A
1 HP

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

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LuBan

13 posts in 492 days


#9 posted 02-14-2018 05:14 AM

That’s good news, and thank you for the reply. I read a lot of your responses and have learned a fair share. Your knowledge and willingness to share is appreciated.

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MrUnix

6351 posts in 2104 days


#10 posted 02-14-2018 05:21 AM

Whoa! Is that the least efficient motor of all time or what is going on?

115/230 V
14.6/7.3 A
1 HP

- Rick_M

LOL – I have a 1/2hp R/I motor that has an FLA of 8A :)
(And a 3hp Baldor that has an FLA of 7.4)

Actually 14A is pretty typical. Here is the “Rule of Thumb” from the Engineering Toolbox:

  • 115 Volts motor – single-phase : 14 amps/hp
  • 230 Volts motor – single-phase : 7 amps/hp
  • 230 Volts motor – 3-phase : 2.5 amps/hp
  • 460 Volts motor – 3-phase : 1.25 amps/hp

Source: Electrical Motors - Full Load Currents

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Rick_M

11109 posts in 2285 days


#11 posted 02-14-2018 05:49 AM

I have never seen a 1hp motor rated at 14+ amps on the badge. It’s one thing to see it on a chart but another to see it on the label. They were probably just being more honest than most.

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

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LuBan

13 posts in 492 days


#12 posted 02-14-2018 05:50 AM


Whoa! Is that the least efficient motor of all time or what is going on?

115/230 V
14.6/7.3 A
1 HP

Haha, back when this motor was built, efficient meant it would still be working at 64 Years old. The cost of electricity where I’m at is unreal. I have been lucky to acquire a decent collection of old machines. Two pm 66’s from 1985. A pm 60 from 1984. A Delta unisaw from 1955 and this latest find. If I’m wondering where all my time has gone, the electricity bill reminds me.

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Rick_M

11109 posts in 2285 days


#13 posted 02-14-2018 07:27 PM

Old motors may have been less efficient but I have a pile of motors, most older than me, the amp ratings are all pretty typical for the HP rating. And if you use the HP calculator at brads link it doesn’t jive with the chart. Same website so what’s the difference?

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

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