Landscape or portrait?

[Jamesnkr]

I think with the pin in pairs method you're less likely to pick up the wrong piece. Always put the Long on the Left (and I was amused to find that after inventing that method myself that (I think) Pete Bingham and certainly others on here follow that same mnemonic) and you can't go wrong. Even when the left becomes the right because you're pinning from behind...

Whereas, long, short, long short - get interrupted and you get out of sync.

I also think that handling a U-shaped piece on an underpinner is not so convenient; it's more inclined to give you difficult turning moments than is an L-shaped piece.

[mho]

I use the turn and pin method, as i use the underpinner from the back and have the frame on a table in front of the underpinner, much easier and faster than the pin 2 halves, then pin the 2 halves together, I get interrupted pinning all the time and it doesn't cause a problem. Each to their own.

[prospero]

A lot depends on whether you work from the front or back of the pinner. I'm thinking it would be slightly awkward to manoeuvre a U if working from the front but less so if you have the frame supported on a table if working from the back.

I always do two Ls. And join long>right. Just to be contrary.

[Tyto]

It's two Ls for me, now I know most peoples say long side on the left but for me the logical way is long side on the right! The reason for that is simple. The right hand measuring arm on the excalibur is longer than the left arm so I always set the right hand stop to the longest side of the mount / glass etc and so it seems logical to place the longest side on the moulding on the right hand side of the underpinner.

[Roboframer]

I bought a second right hand stop for my Excalibur because the left hand measuring scale is too short for many jobs - and now I rarely use the left stop at all!

I also put longs to the right but for a different simple reason, my underpinner is sunk in to one corner of a 12x6ft island workbench and if I start with the longs of each L on the right, the frame ends up running UP the bench and not across it. It matters as plenty of other stuff happens on the bench bar frame joining and whenever we do have to have a big frame going the wrong way, we have to clear the nearest corner to the underpinner.