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Table saw arbor nut; How tight is tight enough?

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Forum topic by MrRon posted 03-17-2013 04:46 PM 1210 views 0 times favorited 14 replies Add to Favorites Watch
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MrRon

2830 posts in 1895 days


03-17-2013 04:46 PM

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

1255 posts in 724 days


#1 posted 03-17-2013 04:50 PM

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

4912 posts in 1229 days


#2 posted 03-17-2013 04:53 PM

Snug is adequate, and +1 for JoeyinSouthAustin.

View knotscott's profile

knotscott

5453 posts in 2027 days


#3 posted 03-17-2013 05:04 PM

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

2830 posts in 1895 days


#4 posted 03-17-2013 06:13 PM

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

4912 posts in 1229 days


#5 posted 03-17-2013 06:16 PM

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

View MonteCristo's profile

MonteCristo

2097 posts in 840 days


#6 posted 03-17-2013 06:35 PM

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 564 days


#7 posted 03-17-2013 07:08 PM

“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

4912 posts in 1229 days


#8 posted 03-17-2013 07:13 PM

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

468 posts in 720 days


#9 posted 03-17-2013 07:25 PM

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

-- Art, Pittsburgh.

View joeyinsouthaustin's profile

joeyinsouthaustin

1255 posts in 724 days


#10 posted 03-17-2013 08:05 PM

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

6951 posts in 1335 days


#11 posted 03-17-2013 08:13 PM

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

4912 posts in 1229 days


#12 posted 03-17-2013 09:08 PM

Thank you folks!

View Straightbowed's profile

Straightbowed

717 posts in 950 days


#13 posted 03-17-2013 09:28 PM

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 1575 days


#14 posted 03-17-2013 09:50 PM

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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