Mortise bit terminolgy

hjlssfor1 · Post by **hjlssfor1** » Fri May 11, 2012 12:16 am

One of the Sawdust sessions on mortising has the attached image in the blackboard section. Can someone please identify the six parts of the bit? I assume that parts 3 -6 will be relevant to sharpen the bit.

This is my first attempt to upload an attachment, so if this message does not have the attachment, I will try again.

Thanks, Hank

JPG · Post by **JPG** » Fri May 11, 2012 1:23 am

hjlssfor1 wrote:One of the Sawdust sessions on mortising has the attached image in the blackboard section. Can someone please identify the six parts of the bit? I assume that parts 3 -6 will be relevant to sharpen the bit.

This is my first attempt to upload an attachment, so if this message does not have the attachment, I will try again.

Thanks, Hank

I'll take a stab at it, but will probably be less than totally accurate.

1 shank(mounting)
2 twist(chip clear out)
3 spur height???
4 chisel surface???(cuts bottom of hole)
5 point(provides centering)
6 spur inside edge(cuts hole periphery)

terrydowning · Post by **terrydowning** » Fri May 11, 2012 12:45 pm

I love wikipedia http://en.wikipedia.org/wiki/Drill_bit#Lip_and_spur_drill_bits

pennview · Post by **pennview** » Fri May 11, 2012 2:02 pm

The bit you included in your post is actually a brad point bit, not a mortising bit. Here's a photo of a mortising bit along with the square chisel -- http://en.wikipedia.org/wiki/Mortiser