Why "adjustable" table saw / miter saw / router insert plates?

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Forum topic by Holbs posted 03-30-2017 12:38 AM 384 views 0 times favorited 2 replies Add to Favorites Watch
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1818 posts in 1960 days

03-30-2017 12:38 AM

Topic tags/keywords: insert plate

I’ll be looking to have a removable Porter Cable 121 OSS in my saw’s table top soon, and a question popped into my feeble scatter brained mind: why are manufactured metal insert plates adjustable? I can understand DIY insert plates to get that 0.005” +/- height in wooden inserts… but metal manufactured ones along with the cast iron saw tops should be easily 0.001” +/- precision so why the need to make them adjustable? Should quality saws come with 0.002” or so lower insert plates than table top without the need to adjust the height? Does the insert platform tabs deform after years of use needing that adjustability?

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter

2 replies so far

View simonov's profile


53 posts in 436 days

#1 posted 03-30-2017 01:59 AM

Maybe the manufacturers are anticipating the rabbets for the inserts are no so precise.

-- Nunc est bibendum.

View Madmark2's profile


379 posts in 519 days

#2 posted 03-30-2017 02:20 AM

Normally you set the leading edge a few thou low and the outfeed a few thous high. This insures no feed jams during use.


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