LA Jack: 62 or 62.5?

[bugbear]

I have never been convinced by the "good for shooting" opinion. Historically they were probably (almost certainly) not used for this function.

"Historically", LA jacks were rare and fragile. It's only the new cast materials that have made them feasible.

However, "historically" low effective angles *were* used for end grain. This was achieved in the famous Spiers style mitre planes, which were bevel up.
With 15 degree beds, and 25 degree bevels, you're around 40 degree effective angle. Lower if you have one of the rare skewed models.

Less well known, and designed mainly (IMHO) for use with a mitre jack

http://www.cornishworkshop.co.uk/wwmitrejack.html

were low angle coffin smoothers, which had bedding angles of around 35 degrees. This gives an effective angle of ... 35 degrees, even with a 30 degree bevel.

Both planes (I will admit) are rather uncommon.

I don't have a Spier mitre plane. :lol:

BugBear

 

[Alf]

'Course history also tells us six-inch steel rules are used for measuring... :wink:

Cheers, Alf

 

[ydb1md]

'Course history also tells us six-inch steel rules are used for measuring... :wink:

Cheers, Alf

I use my folding boxwood rule for laying out dovetails. :wink:

 

[David C]

Bugbear,

Good stuff, Thank you! There is so much more to learn...

I am still troubled by the limited size of the side wings, but anything that works is fine by me.

Amused by ALF's highly appropriate riposte!

David Charlesworth