Results 1 to 5 of 5

Thread: Routing Downhill

  1. #1
    Join Date
    Apr 2007
    Location
    No, not all of SoCal is Los Angeles!
    Posts
    9,076

    Routing Downhill

    I have seen and used the phrases "routing downhill" or "routing with the grain". In roughing out some shop made pulls I had a good example to show this and so here we go:

    You can easily see the grain direction in these pieces. One piece is the master that I shaped by hand, It is double-stick taped to the rough blank to act as a template.

    Click image for larger version. 

Name:	Routing Downhill (1).jpg 
Views:	41 
Size:	59.7 KB 
ID:	81124

    Because of the arc, in order to route downhill I would start at the inside tip and stop at the 'throat' where the grain changes. The bearing is riding on the template piece.

    Click image for larger version. 

Name:	Routing Downhill (2).jpg 
Views:	38 
Size:	62.1 KB 
ID:	81125 . Click image for larger version. 

Name:	Routing Downhill (3).jpg 
Views:	33 
Size:	58.6 KB 
ID:	81126

    Likewise, I would start perpendicular to the grain and route towards the "throat" for the other arc stopping before I round the arc and start routing "uphill".

    Click image for larger version. 

Name:	Routing Downhill (4).jpg 
Views:	31 
Size:	58.8 KB 
ID:	81127 . Click image for larger version. 

Name:	Routing Downhill (5).jpg 
Views:	29 
Size:	58.4 KB 
ID:	81128

    I then raise this top/bottom bearing bit and flip the pattern piece to the bottom and perform the same steps. Again the bearing is riding on the template piece which is then be on the bottom. Sorry, I just realized I got no pics with the bottom bearing in use, how embarrassing.

    Lowering the bit I flip the template to the top and route half of the outer arc. I start in the center and route away and downhill toward the tip.

    Click image for larger version. 

Name:	Routing Downhill (6).jpg 
Views:	29 
Size:	56.9 KB 
ID:	81129Click image for larger version. 

Name:	Routing Downhill (7).jpg 
Views:	29 
Size:	59.7 KB 
ID:	81130

    I then raise the top/bottom bearing bit and flip the pattern piece to the bottom again and perform the same steps for the other half of the outer arc.. Again the bearing is riding on the template piece which is then be on the bottom. This gets me the rough blanks for these shop made pulls. the two long ones in the foreground for the drawers and the split pair in the rear for the doors.

    Click image for larger version. 

Name:	Routing Downhill (8).jpg 
Views:	32 
Size:	59.8 KB 
ID:	81131

    If this makes no sense without the pictures of the lower bearing in use I would gladly simulate that action and take some extra pics.
    Last edited by glenn bradley; 02-16-2014 at 09:36 PM.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  2. #2
    Join Date
    Dec 2012
    Location
    Bedford, NH
    Posts
    1,683
    Glenn, it appears that you are basically "climb milling" which yields a better finish due to the geometry of the cut "chip" (thinner on the trailing edge of the chip), as opposed to conventional milling (thicker on the trailing edge). Although the bearing provides depth control, isn't there still a slight tendency for the bit to want to grab as it exits the cut on the tip or edge?
    Thoughts entering one's mind need not exit one's mouth!
    As I age my memory fades .... and that's a load off my mind!

    "We Live In The Land Of The Free, Only Because Of The Brave"
    “The problems we face today are there because the people who work for a living are outnumbered by those who vote for a living."
    "
    Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." Winston Churchill

  3. #3
    Join Date
    Dec 2008
    Location
    Santa Claus, In
    Posts
    4,779
    Nicely done Glenn. This is one reason I have been eyeballing one of these http://www.woodcraft.com/Product/208...Fe1cMgodKEUA-Q
    If you don't take pride in your work, life get's pretty boring.

    Rule of thumb is if you don’t know what tool to buy next, then you probably don’t need it yet.

  4. #4
    Join Date
    Apr 2007
    Location
    No, not all of SoCal is Los Angeles!
    Posts
    9,076
    Quote Originally Posted by Al Launier View Post
    Glenn, it appears that you are basically "climb milling" which yields a better finish due to the geometry of the cut "chip" (thinner on the trailing edge of the chip), as opposed to conventional milling (thicker on the trailing edge). Although the bearing provides depth control, isn't there still a slight tendency for the bit to want to grab as it exits the cut on the tip or edge?
    I am routing right to left but, realize the pictures may not be telling the story as well as I had intended with the arcs versus the grain direction and all that . Climb cutting would be left to right (on a table) and I do use that technique sometimes but, not here. The focus here is in cutting with the grain as opposed to against it. With mirrored shapes (or simply reversing grain patterns) you can be faced with routing into (against) the grain. A top/bottom bearing bit allows you to route with the grain nearly always.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  5. #5
    Join Date
    Dec 2012
    Location
    Bedford, NH
    Posts
    1,683
    Ooops, I had the cutter rotation backwards. I realized you were cutting right to left, but for some reason I had CW rotation in mind, not thinking that the router was bottom up.
    Thoughts entering one's mind need not exit one's mouth!
    As I age my memory fades .... and that's a load off my mind!

    "We Live In The Land Of The Free, Only Because Of The Brave"
    “The problems we face today are there because the people who work for a living are outnumbered by those who vote for a living."
    "
    Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." Winston Churchill

Similar Threads

  1. Routing Guide
    By Darren Wright in forum General Woodworking Q&A
    Replies: 2
    Last Post: 04-23-2013, 08:16 PM
  2. Bowl routing set
    By Roger Tulk in forum General Woodworking Q&A
    Replies: 9
    Last Post: 06-15-2012, 06:40 PM
  3. Routing a slot
    By Ron Roase in forum General Woodworking Q&A
    Replies: 1
    Last Post: 09-22-2010, 01:07 AM
  4. Routing an Ellipse
    By Kevin Reid in forum General Woodworking Q&A
    Replies: 3
    Last Post: 02-27-2009, 01:22 PM
  5. CNC ROUTING ??
    By Leo Voisine in forum Off Topic Discussion
    Replies: 28
    Last Post: 02-13-2009, 05:21 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •