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Help! Table Saw Runout

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Forum topic by Duffman posted 04-20-2016 03:04 PM 813 views 0 times favorited 27 replies Add to Favorites Watch
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Duffman

61 posts in 788 days


04-20-2016 03:04 PM

It would appear that I have some runout on my PM66, I do not know how to correct this problem. How do I go about fixing it?

-- I'm not addicted to buying tools or wood... I can stop any time I want!


27 replies so far

View Lazyman's profile

Lazyman

687 posts in 847 days


#1 posted 04-20-2016 03:17 PM

A little more info would help. Did it just start recently? Can you move the the arbor from side to side or is it more like a wobble? This may be a dumb question but did you check to make sure that that the problem isn’t that the blade is not flat or that it’s not square to the miter slot and fence.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View Rick M's profile

Rick M

7905 posts in 1840 days


#2 posted 04-20-2016 03:28 PM

All table saws have run out, you’ll need to be more specific about how much, how you tested, and have you done any troubleshooting.

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

View oldnovice's profile

oldnovice

5721 posts in 2828 days


#3 posted 04-20-2016 04:01 PM

Remove saw from the mobile base and it won’t run out anymore!

-- "I never met a board I didn't like!"

View HokieKen's profile

HokieKen

1735 posts in 598 days


#4 posted 04-20-2016 04:05 PM

Like Rick and Lazyman said, there can be different sources of runout. You’ll have to give more information on how much it is. Try to determine if the shaft runs true and if the face of the arbor flange runs true. You’ll need to get an idea of how much runout there is as well.

This article by Matthias Wandel may help you troubleshoot.

-- Kenny, SW VA, Go Hokies!!!

View unbob's profile

unbob

718 posts in 1363 days


#5 posted 04-20-2016 04:36 PM

I have an inspection tag off an older 66, it says arbor run-out not to exceed .002”.
If the fixed flange on the arbor is the problem-one of the cleaver fellows on OWWM site has a method to repair that without removing it from the saw.

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Rick M

7905 posts in 1840 days


#6 posted 04-20-2016 05:06 PM

.002” on the arbor seems like a lot, once you stretch that to the outside of the blade it would be well over .010”.

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

View Duffman's profile

Duffman

61 posts in 788 days


#7 posted 04-20-2016 08:52 PM

ok so, more info would be helpful. specifically I see blade wobble as my saw is powering down. How much wobble though I am not really sure as I do not own a gauge… yet. It has been this way the whole time I have owned the saw (since last august), I guess it could be the blade, theoretically, though when I test to see if the miter slot and the blade are parallel it seems that it is when using my combo square. Because of this I assume the blade is not the issue. The blade has wobbled since new, I guess freud may have shipped a warped blade though that seems unlikely.

-- I'm not addicted to buying tools or wood... I can stop any time I want!

View johnstoneb's profile

johnstoneb

2143 posts in 1633 days


#8 posted 04-20-2016 10:44 PM

Blade wobble when powering down is probably caused by the v belt and is not necessarily runout. To check for runout you need a dial indicator

-- Bruce, Boise, ID

View Dark_Lightning's profile

Dark_Lightning

2631 posts in 2569 days


#9 posted 04-21-2016 02:20 AM



Blade wobble when powering down is probably caused by the v belt and is not necessarily runout. To check for runout you need a dial indicator

- johnstoneb

I think his blade wobble is a tropical delusion (optical illusion). If the v-belt is causing a wobble, the arbor bearings are toast.

-- Random Orbital Nailer

View Rick M's profile

Rick M

7905 posts in 1840 days


#10 posted 04-21-2016 05:06 AM

If you change to a link belt, the vibration when powering down will mostly disappear but get a belt the right width. Also they are noisier than v-belts.

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

View MrUnix's profile

MrUnix

4203 posts in 1659 days


#11 posted 04-21-2016 05:15 AM

If you change to a link belt, the vibration when powering down will mostly disappear but get a belt the right width. Also they are noisier than v-belts.
- Rick M.

Link belts are ok in some circumstances… but on a PM66 (or any multi-belt setup), they are just a waste of money and in some cases will cause even more problems. On that Powermatic, any blade vibration at power down IMO, can only be caused by the blade or bearings.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View simmo's profile

simmo

58 posts in 2932 days


#12 posted 04-21-2016 07:31 AM

Maybe exaggerated on rundown when rotating assembly passes thru a critical speed, ie resonance, think of a bell , they like to ring at the frequency that matches their resonance, largest single degree of freedom of movement, does the saw cut a wide kerf wrt the blade width?
To check the arbor run out a dial test indicator is best, visual check by removing saw from power source, remove blade arrange a pointer ,pencil tip or whatever to be just clear of arbor flange and rotate checking the size of the gap should remain constant, the human eye can easily detect 1 thou,
Hth
Chris

View johnstoneb's profile

johnstoneb

2143 posts in 1633 days


#13 posted 04-21-2016 02:24 PM

If this has a poly V belt then it’s not causing the problem.

-- Bruce, Boise, ID

View MrRon's profile

MrRon

3926 posts in 2703 days


#14 posted 04-21-2016 02:42 PM

Dark-Lightning may be correct. Because the blade has teeth set both left and right, powering down, would give the illusion of a “wobble” at a lower speed when the eye can pickup a left then a right tooth. A flat plate without teeth would give a better view of the arbor as it spins down. Make sure the nut on the arbor is not over-tight as that could distort the blade into a “saucer” shape. Believe it or not, I have seen arbor washers that had a “saucer” shape from over-tightening; my saw was one of them.

View Duffman's profile

Duffman

61 posts in 788 days


#15 posted 04-21-2016 03:05 PM



Remove saw from the mobile base and it won t run out anymore!

- oldnovice

I unfortunately do not have a mobile base to remove

-- I'm not addicted to buying tools or wood... I can stop any time I want!

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