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Any value in bracing or pinning mortise and tenon table apron?

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Forum topic by ppg677 posted 09-27-2017 12:13 PM 729 views 0 times favorited 7 replies Add to Favorites Watch
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ppg677

182 posts in 912 days


09-27-2017 12:13 PM

I’ve built a 2” thick table top (edge grain up) that is 62×37”

The base is 3×3 legs with an apron of 2.75” deep and 7/8” (hard maple).

Tenon are 1 5/16 long. Deep as I could go with my router bit used for making mortises.

Is there any value in reinforcing with corner braces or pinning the tenon’s?


7 replies so far

View LittleShaver's profile

LittleShaver

339 posts in 676 days


#1 posted 09-27-2017 12:28 PM

Pinned joints look good. They could also help if you expect to get a lot of racking forces on the table. Should be fine on a dining table, might need them on a work table.

-- Sawdust Maker

View bondogaposis's profile

bondogaposis

4842 posts in 2407 days


#2 posted 09-27-2017 03:07 PM

If you draw bore the tenons it will add decades to the life of the table, because once the glue fails, eventually it will, the mechanical joint will still prevent racking.

-- Bondo Gaposis

View AandCstyle's profile

AandCstyle

3099 posts in 2313 days


#3 posted 09-27-2017 09:46 PM

PPG, personally, I like the look of pegs which I usually make from a contrasting wood and draw bore tenons will last. However, the answer to your question about pinning the tenons partially depends on how well your aprons and tenons fit. Are your shoulders tight against the legs and do the tenons fit properly in the mortises? If those are both good, then the glue alone will be more than adequate, IMO.

-- Art

View Woodknack's profile

Woodknack

12087 posts in 2436 days


#4 posted 09-27-2017 11:21 PM

I pegged all mine on the interior, or backside of the leg, however you want to put it. Takes a minute, doesn’t have to look perfect, and is good insurance. Nothing wrong with making a nice looking peg on the outside though.

-- Rick M, http://thewoodknack.blogspot.com/

View TaySC's profile

TaySC

270 posts in 390 days


#5 posted 09-27-2017 11:36 PM



If you draw bore the tenons it will add decades to the life of the table, because once the glue fails, eventually it will, the mechanical joint will still prevent racking.

- bondogaposis

What is the purpose of offsetting the hole by 1/4” (or whatever) on the tennon?

View marc_rosen's profile

marc_rosen

143 posts in 3237 days


#6 posted 09-28-2017 01:24 AM

What is the purpose of offsetting the hole by 1/4” (or whatever) on the tennon?

- TaySC

HeyTaySC,
When you offset the hole towards the shoulder of the tenon the dowel will push against the wall in the hole of the tenon which is farthest from the shoulder. This camming action pushes (or pulls, depending on your perspective) the tenon deeper into the mortise until the shoulder touches the wall of the leg. The preferable offset is usually 1/16. A quarter inch would likely be too much offset and you may not be able to drive the dowel through such a tight passage. Marc

-- Windsurfing, Woodworking, Weaving, and Woodducks. "Most woodworkers are usually boring holes"

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TaySC

270 posts in 390 days


#7 posted 09-28-2017 09:58 PM

Hey Marc, thanks for the reply. That makes sense and I guess 1/4” would be too much…. LOL

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