wrote:
On Tue, 27 Apr 2004 14:15:28 GMT, wrote:


In article , Ernest Christley wrote:
Another strobe that many people have in their shop is an automotive timing
light. You can wind a simple coil of a few dozen turns and put it in the
trigger clip. Then, any convenient signal source such as an audio signal
generator can be used to produce the timing signals.

good luck,
tom pettit


But what's a fella to do with the flashing light? What are you
checking and what's it all mean?

I mean the engine's going to have this 74" diameter prop on it and
it's bound to vibrate some. How do you tell what's normal and what
isn't?

Corky Scott

I like that timing light idea. With my laptop and a simple program I
can have a lot more range than is possible with the RatShack thing I have.

Corky, the strobe will slow down any flexing due to vibrations to the
point where you can clearly see it. Sorta makes it slow motion. I
would say that if you can clearly distinquish the flexing in a motor
mount or other supporting part, then it is way too much, and you should
consider a redesign. It may not tell you anything interesting at all,
it's just an easy way to see what and where the vibration are and how
much they are shaking what. But you are right, just because it's moving
doesn't mean it's coming apart. I'll counter that you can decide what
is normal for yourself once you see it moving, and I'll bet dollars to
donuts that if you do see a lot of movement you'll be an expert on what
is normal before the engine leaves the ground 8*) (Yes, that was a long
winded way of saying, "I don't rightly know.")

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber