Jensen-style Z-Chair #19: Seat frame - mounting holes

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Blog entry by Ross Leidy posted 06-21-2019 02:47 AM 291 reads 0 times favorited 6 comments Add to Favorites Watch
« Part 18: Dry fit with arms Part 19 of Jensen-style Z-Chair series Part 20: Back stile tapers »

The sides of the seat frame will become structural members for the side assemblies, keeping the legs from splaying away from each other when there’s weight on the chair. So, it’s important that the seat frame is mounted securely. In Tango’s disassembly photos of an original chair here, there are a couple of dowel pins on the top edge of either side of the front rail that index into holes in the bottom of the seat frame. There are then screws that hold the frame in place, both to the front legs and to the lower rear rail (inferred from Tango’s photos and other’s I found online).

What I decided to do instead was to skip the indexing dowels and use some sturdy cap screws and threaded inserts in similar locations as the wood screws in the original. Here’s a couple photos showing where they’ll go on one side of the chair. A matching pair will go on the other side. (The loose block is a test for the threaded insert.)

I made a mockup first to see how it would work out.

I was happy with the result, so I disassembled the seat frame and drilled the 4 holes, first with a 3/8” forstner to recess the screw head and then a 1/4” brad point all the way through.

Here’s how the rear of the frame will mount to the rear rail.

Then a quick tap on the brad point bit in each of the 4 mounting holes to mark the location for the threaded inserts. I’ll remove the front legs and drill those holes on the drill press. The rear rail holes I think I’ll drill in-situ with the help of an assistant to help me get the angle right. It’ll tackle that this weekend.

6 comments so far

View mafe's profile


12075 posts in 3507 days

#1 posted 06-21-2019 11:42 AM

Crisp detail.
Best thoughts,

-- MAD F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View 489tad's profile


3616 posts in 3429 days

#2 posted 06-21-2019 11:22 PM

I think the cap screws are a very good idea.

-- Dan, Naperville IL, I.G.N.

View Tango's profile (online now)


103 posts in 3970 days

#3 posted 06-22-2019 03:27 AM

A very neat solution to attaching the frame.

View kaerlighedsbamsen's profile


1298 posts in 2131 days

#4 posted 06-22-2019 05:02 PM

Good solution, discrete, clean and neat

-- "Do or Do not. There is no try." - Yoda

View Ross Leidy's profile

Ross Leidy

71 posts in 2359 days

#5 posted 06-23-2019 01:25 AM

Thanks for the kind words, guys.

View Ross Leidy's profile

Ross Leidy

71 posts in 2359 days

#6 posted 06-23-2019 01:29 AM

I ended up drilling the holes for the threaded inserts by hand, and that worked out just fine.

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