Question about arbor diameter vs. arbor hole diameter

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Forum topic by Wayne90 posted 04-25-2019 12:35 PM 593 views 0 times favorited 4 replies Add to Favorites Watch
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1 post in 404 days

04-25-2019 12:35 PM

Topic tags/keywords: question table saw arbor saw blade arbor hole tolerances play

I recently purchased the 10 inch cast iron Rigid table saw (R4512) and when installing the saw blade noticed there was a tiny bit of play between the arbor shaft and arbor hole of the blade. The blade is what came with the saw but noticed the same thing with a new Irwin Marathon blade. I’m new to woodworking and am not sure if this is normal. I checked my circular saw to see if I would get the same result and noticed the same sort of play between arbor and blade hole. Maybe I’m just used to the tight tolerances at my CNC job but I thought it would be wise to investigate before using the saw. I couldn’t find anything on this matter in my few hours of searching online so I thought I would just drop the question here.

If anyone could help me out I would greatly appreciate it!

Thanks, Wayne

4 replies so far

View HokieKen's profile


13565 posts in 1876 days

#1 posted 04-25-2019 01:15 PM

Did you measure the arbor diameter and hole? I’d be curious what they actually are.

I researched this briefly a couple of years ago when I was overhauling my table saw. I never found any definitive answer on what the accepted tolerances for arbor diameter and hole diameters are. I came to the conclusion that for quality saws and blades it’s a tight enough fit to be effective but not so tight as to make production cost prohibitive.

The radial fit is not really that important unless you’re trying to hold a specific depth anyway, such as with a dado stack. What keeps the blade running true is the arbor flange running true. If you measure the TIR on the face of the arbor flange, it should be <.001”.

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

View Aj2's profile


2966 posts in 2535 days

#2 posted 04-25-2019 01:45 PM

Wayne that sounds normal to me for lower end machines and tooling. If the fit is too tight you’ll have a bear of a time getting the blade off.

-- Aj

View Delete's profile


439 posts in 1109 days

#3 posted 04-25-2019 02:52 PM

My Delta saw arbor measures 0.624, the current sears blade I have installed measures 0.625. the blade slips on and off easy enough but there is very little play in the fitting. The more play you have the more vibration will be generated and transfered to the machine (a characteristic of cheaper machines) it will also effect the accuracy of your depth settings. A couple of thou is probably acceptable any more and it will affect the running condition of the machine and the accuracy of your cut depths depending on how close you want to get.

View SMP's profile


2009 posts in 643 days

#4 posted 04-25-2019 02:56 PM

They should be close, but may seem loose when angled due to the coarse threads and chamfered edges of thread. Unless its really off, then you may have a bushing that modifies the arbor or blade?

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