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The little bolts that couldn't - Buggy Alumni Association

The little bolts that couldn't

the cook
Posts: 121
Joined: Wed Oct 15, 2008 7:38 pm
Organization: SigNu
Graduation Year: 1987
Real Name: Duane Delaney

The little bolts that couldn't

Postby the cook » Mon Apr 19, 2010 5:06 pm

I was at design and noted to another buggy alum that I had never seen so many buggies with primary wheel attachment consisting of tiny allen head cap screws threaded into equally tiny holes in the end of spindles.

then I watched a plethora of wheels come flying off said buggies, one of which did it twice (probablty due to stripped threads the first time)

Anyone here think that a bolt clearly less than 1/4" (#10-32 perhaps or 6mm??) can withstand the force of a spinning buggy, or resist unthreading off the left spindles if a bearing chokes?

What exactly is the positive locking mechanism employed on these tiny fasteners?

I suggest a minimum standard for wheel fastening before someone gets hurt, either in a buggy or by being clobbered by a wheel going 35mph.

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 5:17 pm

For what it is worth the Spirit wheels were 'secured' with a 1/4-20 bolt (RHT). Could always recommend a left-hand thread on the left wheel. ;)

the cook
Posts: 121
Joined: Wed Oct 15, 2008 7:38 pm
Organization: SigNu
Graduation Year: 1987
Real Name: Duane Delaney

Re: The little bolts that couldn't

Postby the cook » Mon Apr 19, 2010 5:20 pm

are you sure carl, they looked smaller than that. The one from the second spirit de-wheeling struck one of our alums in the arm but we couldn't find it.

also the bolts that sheared off of SDC psychosis a few years ago (the ill-fated suspension) were #10-32, which I'm sure of because I picked up the pieces.

Carleton
Posts: 151
Joined: Wed Nov 05, 2008 1:16 am
Organization: SDC
Graduation Year: 2007
Real Name: Drew Carleton
Location: Maryland

Re: The little bolts that couldn't

Postby Carleton » Mon Apr 19, 2010 5:25 pm

That wasn't actually the wheel securing bolt, that was one of the linkage bolts. The wheel bolts we use are 1/4 inch bolts.

the cook
Posts: 121
Joined: Wed Oct 15, 2008 7:38 pm
Organization: SigNu
Graduation Year: 1987
Real Name: Duane Delaney

Re: The little bolts that couldn't

Postby the cook » Mon Apr 19, 2010 5:27 pm

yup it was a linkage bolt - that held the linkage on that held the wheel on

Carleton
Posts: 151
Joined: Wed Nov 05, 2008 1:16 am
Organization: SDC
Graduation Year: 2007
Real Name: Drew Carleton
Location: Maryland

Re: The little bolts that couldn't

Postby Carleton » Mon Apr 19, 2010 5:44 pm

Right. One of four or so that shared the wheel load. But obviously, as was witnessed in 04, when one fails, the rest will soon follow.

shafeeq
Posts: 238
Joined: Tue Oct 28, 2008 6:40 pm
Organization: CIA
Graduation Year: 2000
Real Name: Shafeeq S

Re: The little bolts that couldn't

Postby shafeeq » Mon Apr 19, 2010 6:10 pm

On various occasions, #8-32's have kept the wheels attached attached despite the buggy getting punted into the stone curb for long enough to grind down most of the screw head and collisions that ripped the entire axle off. The same design has been used on exposed wheels for least 20 years with no wheel detachments that I know of.

A seized bearing would be a problem - a poorly thought out emergency repair from the spare parts bin (to replace the spindle with the ground down and now unremovable screw in it) caused a bearing to bind and resulted in the complete loss of all retaining hardware on one wheel and only blind luck and poor machining of the spindle prevented the wheel from going its merry way. This scared the crap out of me, so my later designs used a keyed retaining washer that wouldn't spin no matter what.

Looking at the pictures of spun-out Spirit, my question is how do they get the spindles (with no apparent wrench flats) into their threaded axle ends. At least the spindles are positively secured to the axle.

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 6:56 pm


the cook
Posts: 121
Joined: Wed Oct 15, 2008 7:38 pm
Organization: SigNu
Graduation Year: 1987
Real Name: Duane Delaney

Re: The little bolts that couldn't

Postby the cook » Mon Apr 19, 2010 6:58 pm

pipe wrench?

shafeeq
Posts: 238
Joined: Tue Oct 28, 2008 6:40 pm
Organization: CIA
Graduation Year: 2000
Real Name: Shafeeq S

Re: The little bolts that couldn't

Postby shafeeq » Mon Apr 19, 2010 7:04 pm



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