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Table Saw Vibration When Powering Down

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Forum topic by RPhillips posted 09-30-2013 06:25 PM 1039 views 0 times favorited 22 replies Add to Favorites Watch
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RPhillips

687 posts in 553 days


09-30-2013 06:25 PM

Topic tags/keywords: table saw vibration craftsman powering down

Hey guys, I have a quick question. I have a Craftsman 113 TS that I picked up recently off CL and I’m just getting to the point of having it set up right and all that stuff. Since this is my first TS I wasn’t sure about the vibration that I get when the saw powers down.

When I turn it off, it goes into a two step like shut down. It first goes into a decel state that still seems to be “powered”, then it “turns off” and that is when the vibs start… at the lower RPM range. I’m not sure if this is normal or an example of the pulleys not being coplanar or something else.

I also noticed that my Diablo blade has a very slight wobble to it, Is this normal? I noticed this when I was setting up my TS to make sure the miter slots were parallel with the blade. My dado blade runs true and the arbor is also true.

So is this an issue of set-up or just normal? Would a link type belt help here?

Thanks

-Rob

:edited: typos, and to clarify my question a bit

-- Rob - Indianapolis IN - Learning... one mistake at a time...


22 replies so far

View Rick M.'s profile

Rick M.

4318 posts in 1097 days


#1 posted 09-30-2013 06:38 PM

Vibration during power down is normal, a link belt will help considerably on most saws.

The blade wobble must be in the arbor somewhere if it is consistent on all blades.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

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toolie

1770 posts in 1346 days


#2 posted 09-30-2013 08:39 PM

I have a Craftsman 114 TS that I picked up recently off CL

have you got a pic of the subject saw? i’m not familiar with the 114 series TSs from sears, but am intimately familiar with the 113 series of emerson electric built TSs sold through sears.

-- there's a solution to every problem.......you just have to be willing to find it.

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A10GAC

190 posts in 1796 days


#3 posted 09-30-2013 10:10 PM

My 113 series does that to when the belt gets old, it’s most likely your drive belt. If the belt has taken a set from being over tightened or, from a long period of not being used, it will vibrate on power up and shut down. The vibration will be less noticeable on power up because the motor is driving it up to speed in a relatively short period of time. On shut down, the rotating mass of the arbor/blade assembly is just coasting and takes longer to stop so you tend to notice the vibration. Link belts don’t take a set like traditional v-belts so they’re a good choice for infrequently used equipment.

-- Men have become the tools of their tools. - Henry David Thoreau

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knotscott

5552 posts in 2093 days


#4 posted 09-30-2013 10:32 PM

It could be belt related, but it could also be an electrical phenomenon known as regeneration….IIRC, it’s caused from an interaction between the caps and coils, and is consider normal for many saws.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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Christophret

147 posts in 719 days


#5 posted 09-30-2013 11:13 PM

”I have a Craftsman 114 TS that I picked up recently off CL and…”

”I also noticed that my Diablo blade has a very slight wobble to it, Is this normal?”

Arbor bearings may be worn.
Sorry, but, That may be a possibility.

How did you check the arbor?
Did you run it with no blade?

-- I cut it twice and it's still too short!

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Tedstor

1428 posts in 1350 days


#6 posted 09-30-2013 11:20 PM

Check the pulleys. If they are misaligned or loose, the blade will wobble.
I had the same problem with my 113.298762.
“Some numbskull” forgot to tighten one of the set screws after re-installing the arbor pulley.

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RPhillips

687 posts in 553 days


#7 posted 10-01-2013 02:36 AM

Sorry for the typo, it’s a 113.

I used a woodpecker dial indicator and from what i can tell the arbor is true. I didn’t run the saw, i just turned it over by hand and seen no movement. I also checked the arbor for play and the bearings felt good.

Like I said, on the dado blade there is no wobble. I guess I was just wondering if it is to be expected that all stamped blades would have some movement or if I have a bad blade. It seems to cut well, but since I’m no expert here, that could be up for interpretation. I also have no good way to tell if the pulleys are coplanar, but I see no funky wear on the belt.

I guess ill through a new belt on it and see how she acts. Thanks for the feed back.

-- Rob - Indianapolis IN - Learning... one mistake at a time...

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RibsBrisket4me

1389 posts in 1223 days


#8 posted 10-01-2013 02:42 AM

If the blade spins nicely with the belt off, then the bearings should be fine.

Like Tedstor said, I twice had set screws back out of a pulley, creating a wobble and some bad noises.

And, yes if the belt has some memory in it, it will get “dodgy” at low speed…get a link belt.

Good luck!

-- http://www.PictureTrail.com/gid6255915

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Tedster

2271 posts in 929 days


#9 posted 10-01-2013 02:48 AM

You mentioned a couple of times the diablo (stamped) blade has some wobble but the dado blade doesn’t. Just to clarify, are you sure the diablo blade is fully tightened? I ask because if the wobble is in the arbor it shouldn’t matter what blade is mounted, the arbor will still wobble. But if the blade is wobbling on the arbor, that can make for a dangerous situation. Make sure that blade is properly seated and tight.

-- I support the 28th Amendment. http://www.wolf-pac.com/28th

View Rick M.'s profile

Rick M.

4318 posts in 1097 days


#10 posted 10-01-2013 05:51 AM

The key question is how much wobble, or runout, do the blades have? Mine have a couple thousands but if you can see it wobbling then you have a big problem.

Checking arbor runout.
http://www.youtube.com/watch?v=UZkho7kPD4w

-- |Statistics show that 100% of people bitten by a snake were close to it.|

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RPhillips

687 posts in 553 days


#11 posted 10-01-2013 05:42 PM

My apologies guys, I worded my OP badly. I have Autism and it makes putting my thoughts into words pretty difficult, even tho I proof read what I post, it still reads as I’m thinking.

I was meaning that no matter what blade (other than the dado) I was having issues setting up my saw due to the blade being off a few thousandths. I didn’t think to use the dado until my last project. The deflection is any where from .006” to .018” which was making setting up the miter slot parallel to the blade difficult.

I guess in all what I was asking in reference to the blade was is it the norm for a blade to have any deflection.

I’m going to pick up another belt and give that a try and hopefully that will cure vibs on shut down.

KnotScott I think your dead on the the phenomenal effect, I have seen this in other saws/machines before as well. I wanted to mention it as I was not sure.

Ted I’m sure its fully tighten. I also wiped the blades off at the point where it engages the arbor. I also bumped the saw on for a sec and used a scotch bright and ran it along the arbor to make sure it wasn’t collecting saw dust or anything like that.

Rick M I guess that was what I was getting at. I wanted to know if I should expect perfection or if a blade running a little out of true was acceptable and by how much so. Also, thanks for the link.

BBQ Todd I will give that I try when I change the belt.

Tedstor I’ll look in to the pullies and see what I find. I have not touched them myself, but I did have the motor out when I brought it home. I unloaded it myself and have to pull the motor and the wings to get it off the truck.

-- Rob - Indianapolis IN - Learning... one mistake at a time...

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firefighterontheside

5381 posts in 574 days


#12 posted 10-01-2013 06:52 PM

Thinking about dado vs Diablo. Assuming the dado is 8” or less. The measured “wobble” would be larger on the Diablo due to the larger diameter, even though the actual angle is the same.

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

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Paul Stoops

324 posts in 1278 days


#13 posted 10-01-2013 07:18 PM

I noticed that this pulsing vibration was considerably reduced when I changed my Ridgid R4511 from 110VAC to 220 VAC. In either case, the phenomenon didn’t cause any problem.

-- Paul, Auburn, WA

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Rick M.

4318 posts in 1097 days


#14 posted 10-01-2013 07:54 PM

Rob, .018 sounds like a lot to me. Unless you have a batch of bad blades, did you buy them or did they come with the saw? And the arbor is running true when spun by hand, then it must be sloppy bearings. John Heisz has a youtube video about pulling the arbor on his saw and changing bearings.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View cutworm's profile

cutworm

1065 posts in 1511 days


#15 posted 10-01-2013 09:23 PM

Take the blade off and test. Watch the belts during coast down. If they bounce a lot check pulley alignment and tension. Remove the belts and test.

-- Steve - "Never Give Up"

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