Instructables

IPad stylus tip - (How to turn small parts on a Jet lathe), I made this at Tech Shop!

Picture of iPad stylus tip - (How to turn small parts on a Jet lathe), I made this at Tech Shop!
Make this brass tip for holding stylus rubber nibs! This is the hardest part of making your own capacitive stylus!  I needed a brass tip to hold the rubber nib for my pressure sensitive stylus I'm developing. This instructable will show you my stylus tip plans and tips for how to create this on the metal lathe at tech shop.  I made this at Tech Shop San Jose! http://www.techshop.ws/
 
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Step 1: Gather Materials

Picture of Gather Materials
tips_exposed.jpg
3/8"  x 12"   Brass Rod -- I picked this up at OSH (Orchard Supply Hardware) in Northern California USA

Cheap iPad Stylus w/ Rubber Tip -- You need this only for the rubber tip, the one I used is the "rocket fish" brand from best buy


Tools:

Jet Lathe
lathe cutting tools - Carbide Triangle Tip and Straight cut-off tool
six sided collet holder
3/8"  5C Collet 
M4x0.5 Tap and Die

Step 2: The Plan

Picture of The Plan
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nut_drawing.JPG
These are the drawings for the brass tip and the nut at the end. Please use them as a guide, since I did not cut custom tooling for the lathe I could not make the small gap in the middle, on my part it is more of a V shape.

 A note for stylus tip design for the iPad: The brass tip is 6mm diameter and with the rubber it's about 8mm , and this is the smallest you should go. If you go smaller than this the screen will not detect the touch, or it will only detect the touch if you squish down the tip to spread it out.

Step 3: Bevel The Edges!

Picture of Bevel The Edges!
When making this part make sure your bevel the edge at the far left in the drawing, otherwise the sharp square edge will cut through your rubber tip. Guess how I figured this out?