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bonded crankshaft

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lyric20/01/2010 18:13:17
20 forum posts
Hello Ramon,
                         
                              What's this about "lace" at the NDSME ? 

 The mention of it is getting me exited! and giving me naughty thoughts as I am a member  of the North Devon Society of Model Engineers.

I have no problem with large font  being an old timer.
                                                     
                                                  Best wishes,   Lyric
Ramon Wilson20/01/2010 18:16:37
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1655 forum posts
617 photos
Hi Chris  thanks for your help.
 
No, I'm far from a granny on the computer so all help is most appreciated. However in this instance it appears that I'm doing just what you suggest.
 
After the last enlarged text posting I wasn't going to do that again if I could help so I made sure the text was small - 9pt and in Arial. When I tranfered it across copying and pasting as you state it appears in the 'post a reply box' in Arial at the same size as when you're typing in there normally (as I'm doing now). (I notice if you save the post box text in reverse to word it defaults as Times New Romant though I always use Arial)
 
It's only when you hit the 'post' button that it appears in larger text with arrows at the ends of paragraphs - too late of course except to delete it as I did earlier.
 
It continually broke the text at the point you see too - if you are not having a problem doing as you suggest I am beginning to think this could be a fault caused at this end.
 
Sorry to turn this post into a computer help topic everyone any help or suggestions will be most appreciated in the meantime I will endeavour to type faster and keep saving the post box text
 
Regards - Ramon
 
 
mgj20/01/2010 18:21:32
1017 forum posts
14 photos
I don't know about experiences Ramon - I thought that is what one was tapping into. In any crankshaft you have rapidly cycling stresses caused by changes in accelerations, and that's is not good for any material that is weak in shear.
 
As for making a loctited crank. I might if I were in a hurry and I was building a tiddly oscillator or something.  I would pin, but then it would be the pins that were carrying the shear loads and not the Loctite. (In which case one might just as well press - though the chief advantage of a pressed up (single throw) crank is the ability to fit roller bearing big ends.?).
 
However, I don't, in general, see the gain. The vast majority of modellers cranks are single throw jobs which, with a simple fixture, are very easy to machine. Bigger, slender, more complex cranks manifestly need more rigidity  in manufacture so jacking systems are essental anyway, and one is committed to the solid or a  brazed blank..
 
I notice by the way that no one thought to ask what the shear strength of the material was - which has a pretty major impact on the decision.
David Clark 120/01/2010 18:27:29
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3357 forum posts
112 photos
10 articles
Hi There
In the posting box there is a little button you can click to paste from Word.
Third from the right.
Select from Word, click button.
That should remove any Word formatting.
regards david
 
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