REFLECTOR:Nose wheel shimmy
Robin Ream
reflector@tvbf.org
Sat, 9 Aug 2003 09:36:02 -0500
This is a multi-part message in MIME format.
------=_NextPart_000_0005_01C35E59.A6052080
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Hi Guys, =20
This is just a thought. Those of you working on shimmy problems are =
way ahead of me because I'm building, but this might work. Either rent =
or go buy an old spin balancer like they use for big trucks ( you can =
pick them up real cheap at an auction most of the time.) Put blocks =
under the mains the same height as the spin motor is tall, and then set =
the spin motor under the nose wheel and run it up. You should get the =
same shimmy characteristics as on the runway, except that you can stand =
there and watch it to see what goes wrong. You might be surprised at =
what you find. If you push down on the nose, or lift up to simulate =
rocking as you've mentioned having various effects in the email =
conversations, you'll probably be able to confirm or rule out castor =
shimmy. Before I went to all that trouble though, I'd put a dial =
indicator on my brake rotors and slowly roll them around to see if they =
were warped, then use a set of outside calipers to check for uniform =
thickness of the rotor. If either of those are out of bounds you'll get =
one hell of a vibration when you step on the brakes. -- Hope I've =
helped and not confused...
Robin
------=_NextPart_000_0005_01C35E59.A6052080
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2800.1170" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>Hi Guys, </DIV>
<DIV> </DIV>
<DIV> This is just a thought. Those of you working on shimmy =
problems are way ahead of me because I'm building, but this might =
work. =20
Either rent or go buy an old spin balancer like they use for big trucks =
( you=20
can pick them up real cheap at an auction most of the time.) Put =
blocks=20
under the mains the same height as the spin motor is tall, and then set =
the spin=20
motor under the nose wheel and run it up. You should get the same =
shimmy=20
characteristics as on the runway, except that you can stand there and =
watch it=20
to see what goes wrong. You might be surprised at what you =
find. If=20
you push down on the nose, or lift up to simulate rocking as you've =
mentioned=20
having various effects in the email conversations, you'll probably be =
able to=20
confirm or rule out castor shimmy. Before I went to all that =
trouble=20
though, I'd put a dial indicator on my brake rotors and slowly roll them =
around=20
to see if they were warped, then use a set of outside calipers to check =
for=20
uniform thickness of the rotor. If either of those are out of =
bounds=20
you'll get one hell of a vibration when you step on the brakes. =
-- =20
Hope I've helped and not confused...</DIV>
<DIV> </DIV>
<DIV>Robin</DIV></BODY></HTML>
------=_NextPart_000_0005_01C35E59.A6052080--