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Delta Unisaw #6: Video of it running with/without pulley on

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Blog entry by Kevin posted 03-11-2008 02:17 AM 5025 reads 1 time favorited 21 comments Add to Favorites Watch
« Part 5: Motor update Part 6 of Delta Unisaw series no next part

Well I have both a video of the saw with the pulley installed and a video with the pulley pulled off.

It doesn’t show as much in the video as I hoped it would. You can barely see the throat plate moving across the saw with the pulley on. I can assure that it is much worse than the video shows. The biggest difference you notice while standing near it is the sound change from with a pulley to without. I don’t know if the video picks that up or not.

Oh well, I guess it was worth a try. If nothing else I can practice posting a video.

Saw with pulley attached to motor. (no belts installed)

*Saw with no pulley on motor.*

*Thoughts?*

-- Kevin, Wichita, Kansas



21 comments so far

View Woodchuck1957's profile

Woodchuck1957

944 posts in 3223 days


#1 posted 03-11-2008 02:24 AM

Why are there no belts installed ? Did you have the pulley ballanced ? I think you had mentioned earlier that you were going to. You did replace the bearings right ?

View Kevin's profile

Kevin

293 posts in 3417 days


#2 posted 03-11-2008 02:33 AM

Belts are not on yet because the saw still vibrates with just the motor and pulley in it. I can’t really check the arbor for vibration until I solve the motor/pulley vibration.

Pulley was balanced and I did have the motor bearings replaced. After all of that, there is no change in the amount of vibration.

The electric motor repair shop and the machinist that balanced the pulley have both suggested that I pull the rotor out of the motor and bring it along with the pulley and key to the machinist to see if he can get them balanced together. Maybe the shaft he balanced the pulley on and my rotor are not balanced the same.

Anyone else have a better idea than that? Or can think of something other than the pulley/rotot being out of balance that would cause the vibration?

Or, am I just being too picky and I need to just use the darn thing?

-- Kevin, Wichita, Kansas

View Woodchuck1957's profile

Woodchuck1957

944 posts in 3223 days


#3 posted 03-11-2008 02:43 AM

Not that I have any experience with a Unisaw but, shouldn’t the electrical motor shop have made sure the motor was balanced before sending it out the door ? If the pulley is balanced I would doubt that it’s the pulley. I’d try it with the belts on it, maybe that will take care of it. What do you have to lose ? When I asked about if you had the bearings replaced, I meant the arbor bearings. I would still try the belts first before throwing more money at it. Hopefully the belts you have look good and are a matched set.

View lew's profile

lew

11328 posts in 3215 days


#4 posted 03-11-2008 02:59 AM

Is it possible that the machine shop balanced the pully but not have checked it for roundness? A pully could be balanced for weight- like balancing a lawn mower blade- but if the pully is not a true circle it would create a vibration when running.

Just a thought.

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View northwoodsman's profile

northwoodsman

242 posts in 3206 days


#5 posted 03-11-2008 03:00 AM

Does the motor run smoothly by itself sitting on a table or bench or floor without the pulley? If it does, add the pulley and try it. If it still runs smooth, the perhaps your motor mounts, either on the saw or on the motor itself are bent, and when the bolts are tighten the motor is “tweaked”. You may have a bent or cracked motor mount. If it runs smooth without the pulley, is there a square key or bolt that is throwing it out of whack? Can you borrow a motor to test it out and to isolate the problem further?

-- NorthWoodsMan

View Kevin's profile

Kevin

293 posts in 3417 days


#6 posted 03-11-2008 05:36 AM

Lew, I never thought of the pulley being out of round. That is a good point.

NorthWoodsMan, The motor runs smooth while mounted to the saw until the pulley is mounted. I would think that would mean it wasn’t the motor mounts. What do you think?

I haven’t been able to find another motor with a 3/4” shaft to try the pulley on.

-- Kevin, Wichita, Kansas

View Kevin's profile

Kevin

293 posts in 3417 days


#7 posted 03-11-2008 05:36 AM

It sounds like I may be better off buying a new pulley and trying that route after all.

What kind of pulley do you guys suggest/use on your Unisaw? Cast Iron or Steel.

-- Kevin, Wichita, Kansas

View tenontim's profile

tenontim

2131 posts in 3204 days


#8 posted 03-11-2008 05:45 AM

Kevin, the only other thing that I can think of- is the pulley actually tight on the shaft when you tighten the set screw? I checked at the site where I buy my Delta parts and the pulley is not available on line from them. I know I’ve seen places that sell after market pulleys, I’ll have to research it tomorrow. good luck.

View Kevin's profile

Kevin

293 posts in 3417 days


#9 posted 03-11-2008 05:52 AM

The pulley is tight. Atleast I cannot move it back and forth any.

-- Kevin, Wichita, Kansas

View BroDave's profile

BroDave

107 posts in 3273 days


#10 posted 03-11-2008 01:11 PM

I believe you making the right choice with a new pulley Kevin. Always go with steel over cast iron.
If one is available I suggest using a Browning pulley. They are top notch, factory balanced and true.

As an after thought, if your rotor and pulley are balanced together then you will have to replace both if either dies on you. Of course that may never happen but electrical equipment has a thing for burning out.
I never liked cast iron pulleys simply because they are cast. There will always be an “air” pocket somewhere in it.

-- .

View Kevin's profile

Kevin

293 posts in 3417 days


#11 posted 03-11-2008 04:10 PM

BroDave,

You hit the nail on the head with that one. My fear in balancing them both together was that if something happened to either I’d have to replace both.

Can anyone tell me where to order a steel pulley?

The local motor shop doesn’t seem to be able to or doesn’t want to. He tels me that the cast iron is the way to go. Also the local Delta shop says the same thing.

-- Kevin, Wichita, Kansas

View lew's profile

lew

11328 posts in 3215 days


#12 posted 03-11-2008 05:52 PM

Kevin,

Here are a couple of web sites that may help you locate a pulley-

http://www.thomasnet.com/products/vbelt-pulleys-63910806-1.html

http://www.sdp-si.com/eStore/CoverPg/Pulleys.htm?wcw=google&gclid=CPDS3rSzhZICFQWnlgodcQcw_A

The first one has a list of companies that supply pulleys and the second is a specific manufacturer.

Hope this helps,

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View BroDave's profile

BroDave

107 posts in 3273 days


#13 posted 03-11-2008 09:51 PM

If you have a W.W. Grainger local you may find exactly what you need.
I wouldn’t go without pulley and tape measure in hand though, just saying…

-- .

View Kevin's profile

Kevin

293 posts in 3417 days


#14 posted 03-11-2008 09:58 PM

I have looked though Grainger’s online catalog with now luck. Same thing for Thomas net and a few of the others Lew mentioned.

I can find cast iron pulleys, but am still having a hard time finding a steel pulley.

Has anyone ever actually bought one for their saw? Where? How much?

-- Kevin, Wichita, Kansas

View GaryK's profile

GaryK

10262 posts in 3447 days


#15 posted 03-11-2008 10:02 PM

I couldn’t find a steel pully but the OEM ones have been used for over 50 years.

The OEM part number for the pully is 41-644.

Ordering directly from Delta will save you a big $2.00

Here is the complete parts list for your saw:

http://www.ereplacementparts.com/delta-36812-type-table-saw-parts-c-3275_3334_3440.html?osCsid=cab09f434de3209956caa4158b468ee5

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

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