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The little bolts that couldn't - Page 2 - Buggy Alumni Association

The little bolts that couldn't

User avatar
Carl Nott
Posts: 313
Joined: Wed Oct 15, 2008 4:24 pm
Organization: Spirit
Graduation Year: 1998
Real Name: Carl Nott
Location: Seattle

Re: The little bolts that couldn't

Postby Carl Nott » Mon Apr 19, 2010 7:12 pm

Guys, don't make me explain the concept of jam nuts twice in a week. ;)

In retrospect it might have been helpful to spend some time discussing the proper size drill to use with a given tap too. :?

JYuhas
Posts: 13
Joined: Wed Oct 01, 2008 3:47 pm
Organization: SAE
Graduation Year: 2010
Real Name: Jordan Yuhas

Re: The little bolts that couldn't

Postby JYuhas » Mon Apr 19, 2010 7:29 pm


User avatar
Carl Nott
Posts: 313
Joined: Wed Oct 15, 2008 4:24 pm
Organization: Spirit
Graduation Year: 1998
Real Name: Carl Nott
Location: Seattle

Re: The little bolts that couldn't

Postby Carl Nott » Mon Apr 19, 2010 8:30 pm

Fairly certain the stub didn't come off. ;) But I wouldn't suggest their use by anyone not in a situation where they need stubs immediately and fabricated from materials available from Home Depot (I might additionally suggest that folks not crash their buggies quite so often). Spirit did demonstrate a bit of a lack of forethought this year in general tho. ;)

User avatar
lemuroid
Posts: 241
Joined: Sun Oct 12, 2008 8:41 pm
Organization: Ultimate Soap Box Derby
2nd Organization: SigNu
Graduation Year: 1987
Real Name: Mark Estes
Location: Calabasas CA or Sunnyvale CA
Contact:

Re: The little bolts that couldn't

Postby lemuroid » Mon Apr 19, 2010 9:57 pm


User avatar
abordick
Posts: 224
Joined: Fri Sep 26, 2008 1:56 pm
Organization: PiKA
Graduation Year: 1994
Real Name: Andy "old FOAD" Bordick
Contact:

Re: The little bolts that couldn't

Postby abordick » Mon Apr 19, 2010 10:46 pm

Section 6.10, which is called "Steering" says:
Equip all fasteners and hardware with locking devices. Fasteners and hardware include nuts, bolts,
collars, etc., used to attach or secure any part of a buggy’s steering system. Acceptable locking devices
include lock nuts, lock washers, lock wires, cotter pins, etc. The use of anaerobic locking compounds
(such as Loctite) is permissible, but is not sufficient.

The next section is 6.11 called "Wheels" and says the same stuff.
6.11 Wheels
All fasteners and hardware (i.e. nuts, bolts, collars, etc.) that are used to secure a buggy’s wheels to that
buggy shall be equipped with locking devices such as lock nuts, lock washers, lock wires, cotter pins, etc.
The use of anaerobic locking compounds (such as Loctite) is permissible,but is not sufficient.
No buggy may use any official soap box derby race wheels if those wheels are constructed of any type of
plastic material. Experience has shown that these wheels, while adequate for straight line soap box derby
racing, are structurally deficient in buggy racing applications.

User avatar
Carl Nott
Posts: 313
Joined: Wed Oct 15, 2008 4:24 pm
Organization: Spirit
Graduation Year: 1998
Real Name: Carl Nott
Location: Seattle

Re: The little bolts that couldn't

Postby Carl Nott » Tue Apr 20, 2010 1:07 am

Should be able to see the lock washer in the pic, wedged between the nuts and the threaded insert. I have been assured that they used a lock washer with the 1/4-20 bolt but I cannot say for certain. Is tough as I was not there but the general consensus is that the threading was done with too large of a drill bit and done too shallowly (if a word), and I do hope that someone would have noticed a sheared bolt stuck in the stub when coming to that conclusion.

User avatar
BuggyBob
Posts: 129
Joined: Sun Oct 26, 2008 8:42 am
Organization: SAE
Graduation Year: 1974
Real Name: Rob Thomas
Location: Stealing Your Wheels

Re: The little bolts that couldn't

Postby BuggyBob » Tue Apr 20, 2010 8:15 am

Depends completely on the bolt material - strength/heat treatment/thread class/more (Home Depot vs. expensive proof-tested aerospace bolts) as well as what it's threaded into, but especially there needs to some be positive locking mechanism (not just Loctite).
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