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What size mortise do you use?

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Forum topic by Hewy posted 1277 days ago 1409 views 0 times favorited 2 replies Add to Favorites Watch
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Hewy

17 posts in 1319 days


1277 days ago

Topic tags/keywords: mortise size

I just got a hollow chisel mortising machine. What I would would like to know is what width mortise
to use in 3/4” oak. If you use the rule of 1/3 the stock width you would use a 1/4” wide
mortise. This just seems on the small side to me. Would 5/16” be a better choice? Please
let me know what you are using.

Thankyou


2 replies so far

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richgreer

4522 posts in 1706 days


#1 posted 1276 days ago

I personally think the 1/3rd rule is about right. Too big of a mortise can be just as weak as too small of a mortise.

I use 1/4” mortises on 3/4 stock.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View TheDane's profile

TheDane

3739 posts in 2294 days


#2 posted 1276 days ago

It depends. In most projects, I use the 1/3rd rule just as Rich does … especially if the mortise and tenon are both made of 3/4” thick stock.

The exception might be if the project calls for through mortise and tenons (a lot of A&C / Mission furniture uses through M&T). I think 1/4” through tenons look odd, so I will generally go to 3/8” if the tenon will just have a rounded-over end, 1/2” if the tenon will be chamfered.

—Gerry

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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