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Table Saw #1: Jointing

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Blog entry by MXRACER922 posted 01-08-2018 01:46 PM 611 reads 0 times favorited 4 comments Add to Favorites Watch
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I’m a beginner with woodworking and I keep reading about making a jig to joint an edge with a table saw. Why can I not just run both edges of the board along the top fence to get jointed edges? I feel like there is something I’m not seeing as to why this wouldn’t work.



4 comments so far

View TraylorPark's profile

TraylorPark

213 posts in 2018 days


#1 posted 01-08-2018 02:37 PM

The reason this will not work is because the fence only references the side that is against it. Meaning if there is a bow or a cup in the board that will be copied in your cut because the board will move into the blade in the same profile as the edge against the fence. There are lots of videos out there that probably explain it better than I have, but that’s the jist of it.

-- --Zach

View dday's profile

dday

172 posts in 1849 days


#2 posted 01-08-2018 03:17 PM

Exactly as TraylorPark says.. you build the jig to cut one edge of a board perfectly straight and with your blade set to 90 degrees ( I would suggest a digital angle gauge ). Then you can place that new straightened edge against the fence to joint the other edge ( again making sure the blade is 90 degrees and the fence is perfectly parallel with the blade.

View MXRACER922's profile

MXRACER922

2 posts in 560 days


#3 posted 01-08-2018 03:47 PM

Alright, That makes sense, thanks guys.

View Ted78's profile

Ted78

401 posts in 2420 days


#4 posted 01-08-2018 08:14 PM

In practice, unless you have a really funky or very long board, you can. Rip one edge, check that the cut edge is truly straight and square, if it is then you can rip the other side. The two edges will be parallel, and be 90 degrees to the face that was in contact with the table saw bed. But remember parallel COULD mean ess shaped or bowed, curved etc.

-- Ted

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