Author Topic: Checking runout  (Read 1564 times)

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Offline Naildrivingman

  • Posts: 487
Checking runout
« on: October 29, 2017, 07:33 PM »
What would the consensus be on acceptable blade runout in thousandths of inch?  Euro replies metric is ok, I can convert.
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Offline J0hn

  • Posts: 116
Re: Checking runout
« Reply #1 on: November 15, 2017, 03:17 PM »
When I had my old Rockwell 10" saw I remember using the "A-Line-It' system to try to get it tuned up.  They had some info that indicated that .005" or less was acceptable and that "A high quality blade will typically show run-out of less than .003".  Since then,  I have always used that as a reference.

For example on my current table saw, I am running a 12", 80T 'Royce'  and the runout on that blade  is .002"

Offline greg mann

  • Posts: 1842
Re: Checking runout
« Reply #2 on: November 15, 2017, 03:43 PM »
I assume you are asking about axial runout (wobble) as apposed to radial.

Blade runout can be caused by the arbor and flange on the saw. To isolate the source mark the blade relative to the arbor and get a reading, marking the high spot on the blade. Loosen the blade and rotate 180 degrees. Check again. If the high spot stays the same with the same amount of runout it is in the blade. If the high spot moves 180 then the runout is in the arbor. If the runout value changes and also moves from either 180 points then there is runout in both. If that is the case you could possibly mitigate one against the other.

Greg Mann
Oakland, Michigan

Offline Bob D.

  • Posts: 835
Re: Checking runout
« Reply #3 on: November 15, 2017, 04:28 PM »
You probably won't need to do this (and be absolutely sure if you do), but
Matthias' video shows how he measured his arbor flange with a dial indicator.

There are a number of videos on YT which show various methods to accomplish this.

Me, I would think long and hard before making a irreversible move like grinding the arbor flange.

It's a table saw, do you know where your fingers are?

Offline Svar

  • Posts: 1563
Re: Checking runout
« Reply #4 on: November 15, 2017, 05:12 PM »
What would the consensus be on acceptable blade runout in thousandths of inch?
Only you can be the judge of that. Is the cut surface produced acceptable to you?
To me under 0.005" is very good, over 0.01" is too much for fine woodworking. And by that I mean total runout (arbor + blade).
« Last Edit: November 15, 2017, 05:17 PM by Svar »

Offline Naildrivingman

  • Posts: 487
Re: Checking runout
« Reply #5 on: November 16, 2017, 06:11 AM »
I received more information from you all than I was aware of.  Thank you for all the excellent points.  NO! I will not be machining my arbor.  I checked the general runout of a fixed blade and I am going to try the 180* spin method to rule out the arbor or blade.  The acceptable value I found in my research is also 0.005” as well.

Thanks so much!
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