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Table saw arbor nut; How tight is tight enough?

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Forum topic by MrRon posted 492 days ago 1111 views 0 times favorited 14 replies Add to Favorites Watch
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MrRon

2715 posts in 1839 days


492 days ago

Topic tags/keywords: tablesaw

How do you determine when the nut is on tight enough? Everyone has different strength in their arms and hands, so it is difficult to know if the torque you are applying is adequate, correct or excessive.


14 replies so far

View joeyinsouthaustin's profile

joeyinsouthaustin

1205 posts in 668 days


#1 posted 492 days ago

I destroyed the arbor on my unisaw arbor by OVER tightening the nut. I was told by my machine rep/repairman that “sparkplug” tight was correct, hand tighten and then about 1/8 of a turn with the wrench, as the nut will tighten when the saw starts, and over tightening can be bad.

-- Who is John Galt?

View waho6o9's profile

waho6o9

4744 posts in 1172 days


#2 posted 492 days ago

Snug is adequate, and +1 for JoeyinSouthAustin.

View knotscott's profile

knotscott

5365 posts in 1971 days


#3 posted 492 days ago

Overtightening is bad, and can easily distort a saw blade. Arbor nuts are threaded so that they actually tighten when the saw spins, so they don’t need to be very tight. I go slightly more than finger tight….about what JoeyinSouthAustin described.

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

View MrRon's profile

MrRon

2715 posts in 1839 days


#4 posted 492 days ago

Thanks all. I have been overtightening the nut for a long time now. Fortunately there’s no damage. The outside washer has some deformation on it from over-tightening.

View waho6o9's profile

waho6o9

4744 posts in 1172 days


#5 posted 492 days ago

Outside washer? Interesting, as my Bosch 4100 has no washer.

View MonteCristo's profile

MonteCristo

2094 posts in 784 days


#6 posted 492 days ago

waho6o9 does it have an inside flange that will compress (a little) ? If not, doesn’t sound good to me. I have never seen a saw without a compressible washer before the nut.

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

View JamesT's profile

JamesT

102 posts in 508 days


#7 posted 492 days ago

“Snug” is all that is needed. I’m getting ready to change an arbor shaft on a saw I just bought because of over tightening.

-- Jim from Doniphan

View waho6o9's profile

waho6o9

4744 posts in 1172 days


#8 posted 492 days ago

I’m not sure MonteCristo. I’ve just used it the way it was OEM
I’ll check next time for the inside flnage, and thank you for the
friendly advice.

View Bogeyguy's profile

Bogeyguy

457 posts in 663 days


#9 posted 492 days ago

waho, googled the 4100 manual and the PDF shows an outer washer for the 4100-09.

-- Art, Pittsburgh.

View joeyinsouthaustin's profile

joeyinsouthaustin

1205 posts in 668 days


#10 posted 492 days ago

Waho Check page 30 here I have three of these saw and there is a washer between the nut and the blade, as bogey points out, I just am giving the link.

-- Who is John Galt?

View bandit571's profile

bandit571

6640 posts in 1279 days


#11 posted 492 days ago

My old Craftsman #113 has a washer as well. Has a bit of a raised center to it, too. I guess to spread the torque a bit?

Tighten by hand, with the blade wrench resting on the openings edge. Finger tight, then just pull the blade towards me against the wrench. Plenty tight.

-- A Planer? I'M the planer, this is what I use

View waho6o9's profile

waho6o9

4744 posts in 1172 days


#12 posted 492 days ago

Thank you folks!

View Straightbowed's profile

Straightbowed

717 posts in 893 days


#13 posted 492 days ago

JUST snug is good, snug and a bit is how I doit, I broke my wrench when I first got my 1023 on my first blade install learned my lesson them just snug

-- Stevo, work in tha city woodshop in the country

View Howie's profile

Howie

2656 posts in 1518 days


#14 posted 492 days ago

Snug. The blade turns into the thread so it won’t back out.
I suspect there are times when people can’t get their saw to cut straight that this may be the problem. JMHO

-- Life is good.

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