- Joined
- Jul 21, 2014
- Messages
- 10,414
- Reaction score
- 163
SWMBO/LOML rarely misses an opportunity to mention that my current collection of heavy garden/building equipment is not best placed in the middle of a paved area intended for her swing seat.

Typical content
4 builders trestles, concrete mixer, garden compost grader/ soil sifter and a couple of wheel barrows (yes I know we don't really need two. I used to have just one but a brickie left one behind after a job and despite phone calls, never collected it.
The plan is to lay a few slabs over next to the fence and pop a roof on top of four posts to make a covered store. I may or may not add doors depending on degree of enthusiasm etc later.
Here is the site, roughly levelled and with metpost spike driven in to support the posts. Note that at this stage the post are only loosely fitted and will be a bit straighter and plumb later.

The two short ends will be feather boarded to match the fence I put up a few year back. I needed some short arris rails and as they would be on view, I decided to mortise them into the posts.
I used the dado head in the table saw to form rectangular tenons onto the ends of the triangular arris rail pieces.
Firstly a jig to hold the rail. simply an offcut of 4 x2 with a 90 degree vee cut in on the table saw and waxed to slide nicely on the table.

The full dado set is in the back ground at about 24mm width. Tenons will be 60mm long so three passes will munch out the waste.
With the jig on the table the back of the arris is trimmed away.

Flip the jig through 90 degrees and run it against the mitre gauge for the next cut.

Finally the third cut with the broad flat face of the arris against the mitre gauge - not photographed, complete the rectangular tenon.

A little geometry and some schoolboy calculus showed that for a rail of width W, the maximum cross sectional area of the tenon is formed by cutting off 1/4W off each dimension to leave a tenon of 1/2W x 1/4W
This is left for the reader as an exercise to refresh their mathematics! :text-lol:
Traditionally, the tenon shoulders are cut away in a curve. I expect in days of yore, the apprentice was given the job of whittling these but I used the bandsaw.
The same jig came in handy again to hold the ends square whilst concentrating on a estimated curve to end about 2" back from the parallel portion of the tenon.


end result

Here are the completed arris rails having had a dose of tanalising jollop on the cut surfaces.

To Be Continued
Bob

Typical content
4 builders trestles, concrete mixer, garden compost grader/ soil sifter and a couple of wheel barrows (yes I know we don't really need two. I used to have just one but a brickie left one behind after a job and despite phone calls, never collected it.
The plan is to lay a few slabs over next to the fence and pop a roof on top of four posts to make a covered store. I may or may not add doors depending on degree of enthusiasm etc later.
Here is the site, roughly levelled and with metpost spike driven in to support the posts. Note that at this stage the post are only loosely fitted and will be a bit straighter and plumb later.

The two short ends will be feather boarded to match the fence I put up a few year back. I needed some short arris rails and as they would be on view, I decided to mortise them into the posts.
I used the dado head in the table saw to form rectangular tenons onto the ends of the triangular arris rail pieces.
Firstly a jig to hold the rail. simply an offcut of 4 x2 with a 90 degree vee cut in on the table saw and waxed to slide nicely on the table.

The full dado set is in the back ground at about 24mm width. Tenons will be 60mm long so three passes will munch out the waste.
With the jig on the table the back of the arris is trimmed away.

Flip the jig through 90 degrees and run it against the mitre gauge for the next cut.

Finally the third cut with the broad flat face of the arris against the mitre gauge - not photographed, complete the rectangular tenon.

A little geometry and some schoolboy calculus showed that for a rail of width W, the maximum cross sectional area of the tenon is formed by cutting off 1/4W off each dimension to leave a tenon of 1/2W x 1/4W
This is left for the reader as an exercise to refresh their mathematics! :text-lol:
Traditionally, the tenon shoulders are cut away in a curve. I expect in days of yore, the apprentice was given the job of whittling these but I used the bandsaw.
The same jig came in handy again to hold the ends square whilst concentrating on a estimated curve to end about 2" back from the parallel portion of the tenon.


end result

Here are the completed arris rails having had a dose of tanalising jollop on the cut surfaces.

To Be Continued
Bob










