What's the most accurate way to measure apex of the blade on table saw?

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Forum topic by Loki_Lumber posted 04-16-2018 12:55 PM 994 views 0 times favorited 10 replies Add to Favorites Watch
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3 posts in 812 days

04-16-2018 12:55 PM

Topic tags/keywords: jig question measure table saw

I’m making a jig where I need to center something right over the cutting line and apex of the blade (center of arbor?)

I can take a rough eye-balled guess at it, but can’t think of a good technique for measuring this on my table saw.

Any suggestions?


10 replies so far

View adot45's profile


166 posts in 1394 days

#1 posted 04-16-2018 01:03 PM

I use a sled to true up segmented halves. If I understand your question.

-- David -- sent from my linux box

View PPK's profile


1746 posts in 1580 days

#2 posted 04-16-2018 01:19 PM

drop a framing square through the insert and center it on the arbor, then make a line on your insert where the square comes through?

-- Pete

View 000's profile


2859 posts in 1669 days

#3 posted 04-16-2018 01:46 PM

Depends on the type of table saw you have.
On my Delta unisaw the center changes as the arbor is raised.

You can put a piece of veneer or laminate over the throat plate and raise the blade through it to the height you are going to use it at, then find the center of your cut.

View Dustin's profile


707 posts in 1511 days

#4 posted 04-16-2018 02:17 PM

I hope this is clear, but I have a suggestion:

Move your fence close-ish to the blade, butt a small piece of scrap ply against it and over the throat plate. Place a witness mark on the scrap and your fence for alignment later. Raise your blade to the necessary height to cut the scrap, use a square to transfer the edge of the cut to the edge of the board, and then onto your fence (masking tape is your friend). Split that distance to get your center, and you can use your fence to line it up. Make sense?

-- "Ladies, if your husband says he'll get to it, he'll get to it. No need to remind him about it every 6 months."

View Woodknack's profile


13383 posts in 3150 days

#5 posted 04-16-2018 07:14 PM

You can either remove the blade and make an L piece to measure equidistant points from the arbor. But you also need a way to align your stock. So if you set registration tabs equal distances from the arbor in all directions, you can align a square piece of stock. Is this for bowl making?

-- Rick M,

View Loki_Lumber's profile


3 posts in 812 days

#6 posted 04-16-2018 07:26 PM

Thanks for the suggestions everyone, I got it figured out.

Woodknack – it is for bowl making, turned out great and felt safe during the entire process. Nice shallow cuts are the key, only took me about 8-10 min if that. Working out of the garage and don’t have the room/money to buy a lathe but really wanted to attempt making bowls. So far, so good.

View 000's profile


2859 posts in 1669 days

#7 posted 04-16-2018 10:33 PM

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3 posts in 812 days

#8 posted 04-16-2018 10:37 PM

Nice! I’m working on building the second jig to cut the outside cope.

View 000's profile


2859 posts in 1669 days

#9 posted 04-16-2018 11:03 PM

I just did some miter cuts. then embellished it with some walnut.

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Richard Lee

297 posts in 1545 days

#10 posted 04-17-2018 12:00 AM

Coping like that scares me,if it were to grab !!!!
Nice bowl though.
You can also lower your blade and make your circle,measure the cut from the edge and move accordingly.

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