started manufacturing instructions

instructions/manufacturing.md

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+# Hexpen Manufacturing Instructions
+
+## Preface
+These instructions are for machining the pen are intended for use on a 
+manual lathe with an accurate 3 jaw chuck, or .375" hex and round 
+collet using a general purpose carbide turning and facing tool and a 
+.120" parting tool.
+
+## Machining Parts
+
+### Button
+#### Operation 1
+ 1. On the lathe, chuck a .375 303 SS Round bar about 1 inch from the chuck jaws.
+ 2. Face off (zero the Z-axis dial).
+ 3. Turn to Z=-.680 (+.05) to a diameter of .3125-.3145 (zero X-axis 
+ dial).
+ 4. Turn a shoulder to Z=-.079 to a diameter of .2125 - .2165 (X-axis 
+ dial should read .049).
+ 5. Center drill
+ 6. Debur and polish
+ 7. Switch to parting tool and part at Z=-.680 (or .560 + parting blade thickness)
+
+#### Operation 2
+ 1. Insert part into 3 jaw chuck or a collet with center-drill facing 
+ tailstock.
+ 2. Drill to a depth of .325 - .355 with a 3.5mm drill.
+ 3. Tap M4x0.7.
+ 
+#### Operation 3
+ 1. Instert part into a 3 jaw chuck or collet with parted end pacing 
+ tailstock.
+ 2. Take a small facing cut to clean parted end.
+ 3. Use a forming tool or file to produce the radius.
+
+### Tip
+ 1. On the lathe, chuck a .375 303 SS Round bar about 1.75 inches from 
+ the chuck jaws.
+ 2. Face off (zero the Z-axis dial).
+ 3. Turn to Z=-.433 to a diameter of .306 - .313 (zero X-axis dial).
+ 4.