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fan cover optional? Missing fan cover on Delta 83-651

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Forum topic by Perplexed1ne posted 09-13-2020 06:35 PM 422 views 0 times favorited 8 replies Add to Favorites Watch
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Perplexed1ne

25 posts in 189 days


09-13-2020 06:35 PM

I picked up a late 40’s Unisaw that has been rehabbed with a 3hp Delta 83-651 motor. It is missing the fan cover. To my way of thinking this is not essential. The motor is TEFC “totally enclosed” and the fan itself is protected from chunks of wood dropping through the insert. So, no fingers or foreign objects to contend with, it seems optional. My only niggle is wondering if it guides the air flow in some way that optimizes cooling. That I don’t know.

Is this a concern?

Also, I want to build a motor cover to reduce dust and will be running a 5” duct to a hood I am making that will sit inside the cabinet, below the blade. There will be a 3” duct to the blade guard on top. I have the front door taped and use magnetic sheets to cover most of the tilt/height adjustment cutouts. So, other than at the blade, the main air into the cabinet will be on the motor cover for the cooling air inlet. The dust port will be pulling over 500 cfm from the cabinet. I don’t want to starve the motor of air or create too much vacuum stiction at the blade. I can experiment but don’t need to reinvent the wheel.

Suggestions and experience welcome.


8 replies so far

View MrUnix's profile

MrUnix

8244 posts in 3085 days


#1 posted 09-13-2020 06:46 PM

Fan cover? I believe you are referring to the motor cover, and yes, it was an optional item in the 40’s.

Cheers,
Brad

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

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Perplexed1ne

25 posts in 189 days


#2 posted 09-13-2020 06:54 PM

I am sorry for the confusion. The Delta part #83-651 motor itself is missing the cover that forms an endcap to the motor and covers the small motor cooling fan.

But, yes, in addition I am constructing a motor cover for the cabinet and am unsure how large to make the opening for air to pass into the otherwise fairly sealed cabinet for purposes of enough air cooling to the motor and allowing enough air in so that there isn’t sticking at the blade.

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MrUnix

8244 posts in 3085 days


#3 posted 09-13-2020 07:01 PM

Ok, got no idea on the motor end fan cover – it wasn’t optional, but I doubt it matters much if kept away from debris. You could probably contact the manufacture (probably Baldor) or aftermarket supplier and see if you can buy a replacement though. As for the motor cover itself, there are no openings on them – they are solid and cover the motor cutout hole completely. There are way too many ways for air to get into the cabinet as it is to think about adding more!

BTW: Are you sure of the age of your Unisaw? They did not have TEFC motors in the 40’s ;)

Cheers,
Brad

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

View clagwell's profile

clagwell

315 posts in 679 days


#4 posted 09-13-2020 07:58 PM



I picked up a late 40 s Unisaw that has been rehabbed with a 3hp Delta 83-651 motor. It is missing the fan cover. To my way of thinking this is not essential. The motor is TEFC “totally enclosed” and the fan itself is protected from chunks of wood dropping through the insert. So, no fingers or foreign objects to contend with, it seems optional. My only niggle is wondering if it guides the air flow in some way that optimizes cooling. That I don t know.

Is this a concern?

It’s a concern if you intend to run your motor at full power for extended periods of time. The fan shroud directs cooling airflow over the motor case to dissipate heat. Without it the motor temperature will be higher than with it. Higher motor temperature reduces motor lifetime.


Also, I want to build a motor cover to reduce dust and will be running a 5” duct to a hood I am making that will sit inside the cabinet, below the blade. There will be a 3” duct to the blade guard on top. I have the front door taped and use magnetic sheets to cover most of the tilt/height adjustment cutouts. So, other than at the blade, the main air into the cabinet will be on the motor cover for the cooling air inlet. The dust port will be pulling over 500 cfm from the cabinet. I don t want to starve the motor of air or create too much vacuum stiction at the blade. I can experiment but don t need to reinvent the wheel.

- Perplexed1ne

You certainly won’t get 500 CFM with everything plugged up like that. You should have at least twice the area of your duct for intake air into the cabinet.

-- Dave, Tippecanoe County, IN --- Is there a corollary to Beranek.s Law that applies to dust collection?

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Perplexed1ne

25 posts in 189 days


#5 posted 09-13-2020 08:20 PM

That is right on the money!! Thank you for the specificity.

This is a re-badged Baldor motor and I will pick up the shroud ASAP.

I read a lot about dust systems but don’t have a lot of hands on experience. Twice the area of the duct makes perfect sense and helps me as I direct the air into and out of the cabinet.

Thank you for sharing your knowledge and experience.

View NorthernMaple1's profile

NorthernMaple1

5 posts in 41 days


#6 posted 09-19-2020 04:55 PM

Perple is that the 3450 rpm motor? If it is, do you happen to know the motor pulley outer diameter size? I may be upgrading my old bullet motor to a 3hp motor similar to yours. Thanks.

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Perplexed1ne

25 posts in 189 days


#7 posted 09-19-2020 07:28 PM

I bought the saw with this mod. Originally my table had an induction motor and this new motor required a different pulley with different length belts from the original. I’ve been in touch with this fellow who has a YouTube channel on restoring old saws. https://youtu.be/5RdVsYvM3_8 There’s also. Vintage machine website.

Cheers

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NorthernMaple1

5 posts in 41 days


#8 posted 09-19-2020 11:59 PM

Great. Thanks for the info.

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