Chippendale (Newport RI) Desk Legs


(Richard Cournoyer) #1

So the guy who hates wood is making an heirloom circa 1800 modified (one-sided) Partner Desk (John Goddard Designer). I’ve had many people asking how do I do the 4-sided, 3-tiled programming/machining on the legs, so here are (I hope) all your answers.

Timeframe:
Research 2 months (Complete)
Leg Model/test: 2 months (Complete)
Leg Machining/final: 3-4 weeks
Remaining desk machining: 6-9 months
Cost: Wood/hardware: $1000 (est)

Programing/Machining. How: In Fusion I create 4 different Setups (on each Square Block/ centered on the dowel hole) (the middle block will be removed during the 3rd tile move, and the end blocks manually removed via a miter saw).

While not a difficult project, it’s also not a for the novice. Strict bookkeeping must be maintained due to 32 difficult programs. A good program loaded in the wrong position will scrap the leg. I still need to write the various programs for the 6 Mortices on the leg top. The other photos should answer most of your questions. Let me know if I’ve left anything out.


.

.

The Setup. The cap screw head is being used as a locating dowel pin, and the 123 block (in the back) aligns the leg 90º to my table.
.


.
Finish leg (as modeled in Fusion (Missing the 6 Mortices, which I will design and program while the legs are machining)

Material: African Mahogany.
Cost: $50 per leg (No I didn’t buy any extra material!)

44%20PM

Six Mortices

Test Leg (Pine/Fir) (Without the upper portion)


.

Philly Inspired Partner Desk (There are NO photos of a Newport inspired Desk) Differences are subtle.


(Griff Carpenter) #2

I’ve been contemplating doing something like this…as soon as I learn how to model a leg from scratch. Thanks for the description and photos.

Looking forward to updates as the project progresses.


(ray) #3

chippendales

Very nice work around/work flow. Looking forward to the finished product.


(Richard Cournoyer) #4

They ARE Done!
Here are the numbers
37 days (26 actual machining days), 51 individual programs (x) 4 legs = 204 program runs, 127mb of program data (largest program was 8mb, smallest 3kb), 48 Setups… and NO Shapeoko or Program Errors = Miracle!

PS1: I still need to program and machine the six mortise slots in each upper leg post.

PS2: The 1.0" x 1.0" notch on the upper leg will receive a fluted 1/4 column (I really could use a 4th axis to make these but will make do with my 3 axis). You can see a sample of the 1/4 column above (finished desk photo).

Lots of sanding and hand carving to do and many coats of homemade shellac.

Now on to the other 64 parts…

Note I made: 1Right Front, 1 Left Front, 1 Right Back, and 1 Left Back.


(Richard Cournoyer) #5

Turned and milled Quarter Columns (they get inserted into the legs) fresh off my CNC Shapeoko Lathe: