Re: What do you feel or sense at the end of the casting stroke?

Last one from me. I think everyone has the rest of the messages from Gordy and
Server...

----- Original Message -----
From: WALTER/SUE SIMBIRSKI <simbirsw@xxxxxxx>
Date: Friday, April 7, 2006 9:49 am
Subject: Re: What do you feel or sense at the end of the casting stroke?

> Server - I'll be looking forward to your thoughts on how this 
> relates to casting defects. I've scratched the surface a bit but 
> at this point I'm in the role of the student trying to understand 
> the information in my own way (observe/listen, absorb, restate).
> 
> In answer to your question about my line of work - I'm a network 
> architect working for a defense contractor in Calgary, Alberta (I 
> get to fish the Bow River almost any day I want!). My educational 
> background is in Engineering Mathematics. My math and physics are 
> a bit rusty I'm usually not overwhelmed by most technical discussions.
> 
> At Gordy's request I'll put together the chain of emails leading 
> up to this point and forward it to the rest of the group this week 
> end.
> Cheers!
> 
> Walter
> 
> ----- Original Message -----
> From: Ssadik1@xxxxxxx
> Date: Friday, April 7, 2006 7:23 am
> Subject: Re: What do you feel or sense at the end of the casting 
> stroke?
> > Walter/Gordy
> > 
> > It was pretty late last night when I spotted your E-mail.  
> > Something with AOL 
> > has changed within the last couple of years.  I used to be able 
> to 
> > reply to 
> > E-mails with annotations on the original E-mail and I can't seem 
> > to do it now.  
> > Anyway I'm forwarding your message to my office at the 
> University 
> > and will 
> > see if I can get a pleasant resolution there.  So you can expect 
> a 
> > more detailed 
> > response later.  I'm gratified that are able to reconstruct and 
> > understand 
> > the various effects but I'll amplify.  Good work -- my the way 
> > what is your line 
> > of work??
> > 
> > I saw your remark about stiffness and didn't think it was 
> serious 
> > enough to 
> > comment on because it was clear what you were saying from the 
> > context.  If you 
> > were a second or third year engineering student it would have 
> been 
> > a different 
> > matter.  However stiffness doesn't refer to a force (as in 
> > "resisting force") 
> > --it does refer to the slope of the plot of resisting force 
> versus 
> > lateral 
> > deflection of the rod.  For small deflections of a graphite rod 
> > the slope of 
> > this curve has a constant value because the curve//plot is a 
> > straight line (hence 
> > this range of response is technically called "linear").  Just as 
> a 
> > note of 
> > interest (and because it is very important) when the response is 
> > linear there 
> > will be a first mode of vibration with a specific//constant 
> > natural frequency 
> > which then dictates that the rod unloads in a specific time 
> > duration (assuming 
> > the attached fly line weight has a specific value) regardless of 
> > amount of rod 
> > defection//loading.  Hence the effect that larger rod 
> deflections 
> > lead to 
> > proportionately larger free flight line speeds.  However the 
> > linear response is 
> > achieved very well in practice with modest rod deflections but 
> the 
> > "force//defection curve"  bends over as rod deflections increase 
> > due to rod 
> > cross-sectioning ovaling and other effects we call large 
> > deflection//distortion effects so 
> > the benefits of large rod loading drop do not accumulate as 
> > rapidly as the 
> > simple theory predicts.  Some, like Gordy have heard of the 
> > effects of nonlinear 
> > material response but I can assure you there is absolutey no 
> > nonlinear response 
> > when using graphite rods.  I've paid considerable amounts of 
> > contract dollars 
> > to verify that graphite composites of interest perform just like 
> > the parent 
> > material -- they failure due to elastic ductility exhaustion 
> > (meaning is clear 
> > from choice of words -- fiber rupture in elastic range).
> > 
> > Anyway I'll have more later -- primarily on how to interpret 
> this 
> > structural 
> > phenomena as it relates to casting defects.
> > 
> > Regards - Server
> > 
>