Windsor Chair repair

[Setch]

I've repaired a few spindle backed chairs in the past, and this has mostly been a case of fresh glue, and fresh wedges in the wedged through tenons under the seat.

This one is a bit more challenging. It's the second attempt on this chair. The first attempt with new wedges and liberal quantities of liquidhide glue worked a treat at tightening the tenons up, but alas, one tenon was not longer attached to the back.

Spot the difference!

 

[Setch]

So, how to graft on a new tenon, ideally without it showing?

I considered trying to drill down the endgrain for a dowel, but wasn't convinced I could do it accurately, and I wanted to maximise the glue area, ideally without removing what little was left of the tenon, as this would help me cut the new tenon in the correct place.

So, improvised horizontal mortising rig:




The little Makita trim router is clamped down securely, and the height of the workpiece adjusted by stacking MDF offcuts till I was happy - 2 bits of 12mm seemed about right. I clamped another piece of 18mm MDF to act as a fence for left/right location.




I did a first experiment with a 1/4" straight cutter, sliding the workpiece forward into the cutter, and simultaneously side to side, like a domino, but moving the work not the cutter. That worked smoothly, with no tendency to snatch or chatter, so I stepped up to my extra long 3/8" cuttter.

The result was this nice clean mortice.

 

[Setch]

Next, I'll need a tenon. I cut one on my tablesaw crosscut jig, then traced round a 3/8" bearing so I could shape a matching radius to the mortise.


I little chisel and file work produced a nicely fitting tenon.



I knocked the joint together with a hide mallet, and then couldn't get it apart - I clamped it in the vice id my workbench, and actually lifted the entire bench, and attached drawers while trying to pull it apart.

 

[Setch]

There then followed quite a lot of messing about trying to get the shoulders scribed to fit without minimal gaps.



I cut the tenon to length, and started test fitting to the chair so I could do some preliminary shaping of the tenon before it was glued into the back.



The back is quite unwieldy to work on, so having the replacement tenon unattached made some trimming easier.

 

[Setch]

Before glue up I pared the face of remaining half of the original tenon so it was clean and flat, and prepared a wedge to fill the gap where it split along the shortgrain.

Then, creative clamping strategies! The beech scrap had some abortive carving experiments on it, so I jammed in a screwdriver the help squeeze the wedge tightly.



A better view of the wedge before trimming...



...and then after shaping.




And a dry fit.

Edit - Apologies, the formatting is all over the place, as I'm posting from my phone.

 

[Blackswanwood]

Good bit of improvisation there - nice one

 

[JSW]

...and then after shaping.

With the Opinel knife in the background I take it. Nice work!

 

[joshvegas]

Setch, di you used frequent a guitar building forum many years ago. Seem to recall a dinky set of luthier planes made by that username.

 

[Setch]

Setch, di you used frequent a guitar building forum many years ago. Seem to recall a dinky set of luthier planes made by that username

Does this answer your question?



Which forum? I was a long term poster at the MIMF, and an admin on Projectguitar.com, as well as posting a luthiery blog called "Luthier than Thou" for quite a while.

 

[joshvegas]

Yea thats them! Project guitar. And i think actually it was the blog i saw the planes and then realised you were the same person.