Replies

1. 
   JiminFla | Sep 09, 2009 10:22pm | #1

   Sounds like you were climb cutting.  You need to go from left to right if you're using the router without a router table; right to left with a router table so that the router follows the pattern.

   Jim

   http://www.jimreedy.com
2. 
   JohnWW | Sep 09, 2009 10:27pm | #2

   Straight flute bit?

   John White
   Shop Manager for FWW Magazine, 1998 to 2007
1. 
   rbogle | Sep 10, 2009 12:40am | #6

   yes it was straight bit not spiral but have used same bit on 3/4 with no problems

1. 
   JohnWW | Sep 10, 2009 03:50pm | #8

   Straight bits take intermittent bites twice per revolution. At some point, as the stock gets thicker, the resulting forces become hard to control as the bit digs into the wide cut surface. You will probably find that a spiral bit, which cuts continuously, will give better control.If you aren't doing this already, making this cut on a router table, with a starting pin, rather than guiding the router by hand, will also improve your chances of making a smooth cut.John White
   Shop Manager for FWW Magazine, 1998 to 2007

1. 
   rbogle | Sep 10, 2009 07:21pm | #9

   thank you very much, it makes sense. Ron

3. 
   DougGF | Sep 09, 2009 10:45pm | #3

   How big was the piece?  What you are describing is not uncommon when smaller pieces are being outed on a table without adequate holddowns.

   Bad bit?

   
   

   ---

   Edited 9/9/2009 3:48 pm ET by DougGF

4. 
   Senomozi | Sep 09, 2009 11:20pm | #4

   Message http://forums.taunton.com/fw-knots/messages?msg=47692.4 is a post I did to answer someone who was having similar problem. Perhaps this applies to your situation?

5. 
   md2453 | Sep 09, 2009 11:36pm | #5

   Bogle:

   I recently did a small production run of oak library chairs, the back legs were cut from 8/4 oak on the bandsaw and then final shaping was done with a jig and my handy P/C router and a big 4 1/2 inch long 1/2 inch diameter carbide upcut spiral bit.  Worked like a charm, no kickback and nice clean surfaces.  I think it is a Whiteside bit.  After 48 legs it is still sharp and no burn marks.

   Madison 

1. 
   rbogle | Sep 10, 2009 12:42am | #7

   Thanks maybe straight bit wont work well on thicker material.