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Tablesaw Workstation #4: Straightedge guide not straight????

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Blog entry by JohninSD posted 10-09-2009 10:35 PM 1399 reads 0 times favorited 2 comments Add to Favorites Watch
« Part 3: Squaring Up the Tops Part 4 of Tablesaw Workstation series Part 5: Some progress on the drawers and tops »

An interesting thing happened this morning in the shop. The straight cutting guide I made yesterday for my Skilsaw didn’t cut straight. I trimmed one edge of my plywood top blank and when I laid a straightedge against the cut surface it would rock about 1/32”. Investigating, I found that my edge guide had a slight bow in it, about 1/64-1/32” in a 48” span. I assumed I had erred in its construction, normally a valid assumption, and set about to make another one. I had a piece of plywood about the right size and the edges both checked straight with my straightedge (an aluminum T-square that’s part of my Exac-T-Guide). I cut a new piece of hardboard and proceeded to glue and screw the two pieces together. Checking again with the straightedge I found that the plywood now had a bow in it of about the same magnitude as the one from yesterday. I removed all but two of the screws, leaving the two nearest the ends, and checked again – the glue had not not set up so the wood was free to move. The plywood checked straight again. Apparently when I drive screws I do it cockeyed so I’m going to let this one dry over the weekend while I go out of town. Fortunately I made the top blank big enough to allow for this kind of thing so I can still trim it to final size and don’t have to start over.

-- John



2 comments so far

#1 posted 10-10-2009 12:30 AM

It’s very common for screws to pull components out of their proper place if there’s any way for them to move.

Can you clamp up your assembly until the glue is set and then drive the screws?
That might give a better result.

d

-- Will trade wife's yarn for tools.

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a1Jim

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#2 posted 10-10-2009 12:51 AM

The best laid plans wood may change and screws too.

-- http://artisticwoodstudio.com Custom furniture

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