English Mortice Chisels

Re: Trade practice

Pam Niedermayer - Austin, TX

>True, but usually I don't make frame and panel pieces, vast majority of doors I've made are shoji which don't have or need grooves at all, just lots of tiny mortises. I completely agree with your summation, to the point of grinding plough blades to metric sizes whenever needed.

Pam

Re: I'd agree....kinda....

Andrew F in Australia

>Hi All,

The haunch does provide a resistance against twisting, and the secret haunched mortice and tenon is indeed used at the top of a leg to avoid twisting forces to keep the table rails stable.

However, as far as I'm aware, the application of a standard haunched mortice and tenon is to have the haunch cut to fill the groove, as it's quicker and easier to run a through groove in a door stile.

If you were cutting by hand and your plough plane iron and the mortising chisel were slightly differently sized, then I'd either pare out the mortise wall to match the groove (probably) or regrind the width of the plough iron if it was a common occurrence.

Best regards,

Andrew

"it was a common occurrence"

Andrew F in Australia

>What I meant to say was:

"I was cutting a lot of mortises and grooves by hand, such as a large or constant run of doors. The tools are the means to an end, but I wouldn't be using anything valuable to do this to."

Wiley, if you'd like to edit the post above, feel free to.

Cheers,

Andrew

The tenon itself resists twisting too....

John in New Mexico

>Most of my tenons are a lot wider than they are thick, so the tenon provides the primary resistance to twisting. A haunch does augment this somewhat, but its primary effective in my view is to support the edge of the rail where there is no tenon, and the rail is prone to movement when it picks up moisture. However, thats all really just a matter of semantics, and you're probably looking at a different situation with shoji and all those little tenons, the would tend to twist easier.

John

They're clear and articulate as is, Andrew (

Wiley Horne--So. Calif.

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