I'm shaping Beech pieces 20"L x 2"W x 7/8"T with a 3" radius along the 20"
side and getting a 30% attrition due to break-out and tearing. I'm using a
5hp Powermatic with a 3 blade 3" dia. shaper collar having 45 degree hook
angle on 1/4" thick by 1.5" wide lock-edge knife stock. I've tried
climb-feed, opposing-feed, faster and slower table speed. I suspect the
hook-angle is too acute, but before I make new cutters, I want some advise.
What is the worst of what I am doing wrong? The 30% bad is killing me!
It's good to see you 'round these here parts, Tom.
Are you still in the midst of that huge project and will you ever be
able to post pictures of it?
Hope everything is going well out your way.
Thomas J. Watson-Cabinetmaker
Gulph Mills, Pennsylvania
Yeah, I am still on my "project". They started the house 20 months ago and
have yet to sheet rock. I am looking at finishing the woodworking part by
next summer. It is very much a dream job for a woodworker. It will have
provided me and my helper with a year and a half of work plus I was able to
design the interior. Basically I am doing whatever I can think up that looks
cool. It's almost embarrassing. I wish I had time to do the cabinets in this
house. I will post pics on 'abpw' when possible.
Maybe several passes would do it? Close-fitted fence inserts (zero
clearance) ? The blades are well-ground, balanced and set identical?
BTW, how does one measure the angle on these blades, other than 45*? Does a
15* angle mean as in a scraping chisel (wood turning), or a very low angle
like in a fine paring chisel? IOW, do we mean angle from flat or from 90?
Yes, the knife needs to be a low angle scraping type for hard and fibery
wood. If the angle is too much, the arc of the cut pulls the wood up and
pops it apart. In other words, you don't want the edge of the knife to get
under the grain.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.