Carbide Scraper-Deburr Tool

These are directions for how to build a simple Carbide Deburring Knife...
 I did this build at The TechShop in San Jose California...
http://techshop.ws/
 Gabriel Aceves

Ok we are going to need, 6inch length of 1/4 alluminum rod,
 1/8 inch carbide shank ( I used a
 broken .125 endmill), .120 inch drill, .124 inch reamer,
Grinder capable of grinding carbide

Ok, Now we are going to face the ends  of our piece so that it is
square and flat...   Chuck up on your part and face of the front using a
 metal lathe....

Now we are going to spot our hole that we are going to put in the end of our part...
 Using a center drill spot the hole so that the chamfer is slightly larger then
 the size of the shaft of the carbide rod...

So now we are going to Drill the pilot hole for our
 reamer to follow with a .120 size drill....  It is very important that your
 hole diameter is no larger then .125...  Otherwise your carbide
 rod will slide and fall out instead of pressing in...  So you are going to want to
drill your hole about 1/2 of an inch deep...

Now you are going to ream your hole out using a .1245 reamer...
 Use care that you get a good hole that is not to large so your rod
 does not fall out...   If your hole is slightly to large you can
 compress the side of your peice to make yor hole slightly
 oblong and your rod may then press in...  but this is less then
 ideal and may lead to failure later...

So now you are going to press your carbide rod into
 the aluminum rod...  Clamp the aluminum into a vise
 using something to protect the side if you do not want your aluminum
 to get marred by the vise...  Now hold the carbide in posisition and gently tap
 using wood or some other soft material...  Be careful because carbide is
 brittle and may shatter if hit with steel or just hit to hard...  Gently tap intell 
the carbide rod is well seated in the hole to the full depth..

This part is the part that requires to most skill
 and i find the most difficult..   Using a grinder that is capable of grinding carbide
 grind the carbide intell it is shaped like a knife...  This will take some practice
 and patience...  DO NOT QUENCH IN WATER OR OIL TO COOL DOWN>>>
  Carbide will shatter if cooled to quickly....  Sorry about the
 photos... i could not get my camera to focus...
  Ok that is it I hope this was helpfull... I did this project
 at the TechShop in San Jose California,   Gabriel Aceves...