- Joined
- Aug 29, 2006
- Messages
- 574
After having some problems with wrist pins, I would like to make my own. I am considering using M-2, but could use S-7 as well. Any input on this topic?
M-2 or M-42 hardened & ground blanks, -.0000" to +.0002" or +.0000" to -.0002", can easily be obtained in wire, fractional & metric sizes from William T. Hutchinson Co. M-2 wil be 62 to 64 Rc & M-42 will be 66 to 68 Rc. The blanks can be obtained in different lengths & the harder material is more expensive. Wrist pins should be solid in the middle & drilled from both ends. Both materials can easily be drilled with a sharp four faceted C-2 grade carbide drill.After having some problems with wrist pins, I would like to make my own. I am considering using M-2, but could use S-7 as well. Any input on this topic?
Tom,Thanks for the information. The stock wrist pin is hollow on one end and solid on the other. I normally put the solid end toward the exhaust port to block off exhaust from entering the wrist pin. If I drill in from both ends, the exhaust could enter halfway. Would that cause any poblems?
I make the carbide drills from end mill shanks. The Niagra brand carbide seems to work the best.
Enter your email address to join: