I am unable to produce a good self centered hole using a drill press with the metal or ptfe material in the drill press and 3mm dia drill bit held in hand with pliers.
It is always off-center at the tail end. I have had this happen to every PTFE and nozzle I tried with this method.
I am trying this new technique to make sure the entry hole is parallel to the length of the cylindrical material.
Secure a wood block (4"x4" or 2"x4") to the drill press stand and drill a hole thru a it to tightly fit the material.
Secure the material to the wood block (bolts for threaded metal, pliers for ptfe), and secure the wood block to the drill press stand.
To avoid metal filings getting stuck in the threads (if using bolts to secure the metal), push a piece of paper on the metal, to sit on top of the bolt and catch metal filings.
Use a center punch to make a notch in the metal.
Mark the depth to drill on the drill bit (painters blue tape works ok for this), and center it on top of the material.
Use a 1:1 mix of oil and water (a drop or two frequently) to as coolant if drilling into metal (Al or Brass).
Drill slowly, and remove any excess metal filings (beware, they are hot).
Let the metal cool before attempting to extract it.
I hope this process is much easier using a Lathe. Are there any other techniques everyone uses with a drill press?
