Replies

1. 
   DougF | Jun 09, 2006 04:19pm | #1

   Some of the noise is can be from the fact that the ZCI margins have not "run in" sufficiently but I suspect that most of the noise is related to the fact that the sound  has been altered by the ZCI and it is now being dissipated differently than with the original throat plate.  With the original thin plate and wide blade slot, the turbulence and the resulting harmonics were not compressed against the sides of the thicker ZCI and that will alter the sounds creates by the spinning blade.   An analogy is the sound of the wind and road noise driving on a the open road with your windows down and what it sounds like when you are in the inside lane driving along side those concrete highway dividers. 

2. 
   HowardAcheson | Jun 09, 2006 06:32pm | #2

   Doug has the probable answer.  The fact that it makes a little noice is indicating that the blade tips are just barely touching the insert.  That's what is supposed to happen.  It will somewhat disappear over time and then you will have to consider making a new one.

   Howie.........
3. 
   sapwood | Jun 09, 2006 06:35pm | #3

   Wouldn't sanding the sides sort of defeat the purpose?

   Good hearing protection is a simple fix.

4. 
   Rennie | Jun 09, 2006 06:47pm | #4

   I don't mean to highjack......but this seems a good place to relate an issue I had with with a ZCI and see if anyone here has had a similar problem or has come up with a solution.

   Some time ago I purchased 2 blank UHMW inserts for my Jet cabinet saw. From the beginning I noticed that the insert I used as a ZCI seemed light in the hole and tended to move a little when the saw started. One day it caught the back of the blade (missed me) and left a nice ZCI shaped dent in the refrigerator door about 8’ away.

    

   Since then I have been reluctant to cut the other insert for fear of a recurrence.

    

   What are all of you doing to prevent this? Shim the hole? I considered using a dab of epoxy to mount some rare earth magnets under the insert to hold it from moving. Would this work?

    

   Regard it as just as desirable to build a chicken house as to build a cathedral.
   Frank Lloyd Wright

1. 
   vonmagnuson | Jun 09, 2006 07:06pm | #5

   I made one for my saw (a General)  and worried about the same thing.  I figured out when my normal insert rested and then drilled and tapped 10-32 holes away from those points to hold it in place.  There is probably some super easy way to do it, but I don't know what it is.Magnus

   "Remember, a bad carpenter always blames his tools" -Joe Conti-

2. 
   mike_b | Jun 09, 2006 07:25pm | #7

   You would probably need to pre drill in the material your insert is made of, but you can put a finish nail in the end of the insert angled so that it tucks under the table preventing the blade from lifting it out of the throat.

5. 
   mike_b | Jun 09, 2006 07:16pm | #6

   If your blade is cutting square and clean, I wouldn't worry about the noise.