Sorry George, thread rolling is the only, and I will repeat that ONLY, process that is truly safe. It produces a radiused thread root that doesn't invite stress risers. You can get form TAPS as well which is the right way to go if the thread will see stress. Search your area for thread rolling, or go to a good hardware wholesaler to buy the correct bolts. For a single rotor you should be able to buy over the counter bolts easily.
Bill Jepson
-----Original Message-----
From: George Lendich <lendich@optusnet.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sat, 14 May 2005 07:39:33 +1000
Subject: [FlyRotary] Re: I need misc engine parts
Kelly,
I've got 12 A bolts, but the thread looks like it's rolled and sits proud of the bolt diameter. I might have trouble getting that done locally.
So what is the recommended process for the thread forming ?
George ( down under)
Rusty,
On the subject of bolts for your single rotor........The bolts from a 12A are
constant diameter and can be shortened and rethreaded........Should not be
to hard to find a junk 12A........FWIW
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2
-------------- Original message from "Russell Duffy" <13brv3@bellsouth.net>: --------------
I also just got a single rotor engine today that I bought from a guy on Ebay. It's got bolts of course, but probably not any sort of official 20B parts. I'll have to pull it apart to see what it's really got inside, but it looks like older housings of some type. The shaft is a cut down 13B, which looks usable so far.
What are you using for bolts?
Cheers,
Rusty (Sonerai goes on sale in 22 minutes on Ebay)