Grade 8 shear bolt confirmed!

   / Grade 8 shear bolt confirmed! #41  
Nomad,
It is evident that you are coping a King Kutter brush hog by your picture. If so there are over 100,000 King Kutter brush hogs running now in the USA. Don't you think KK has settled the shear-pin question. The shear pin is and easy question to answer. Also in your picture you have your copy of the KK assembled incorrect. What about the gearbox? What standards are you using? Where did you get your data to enter in your computer test model? Is there a computer testing model or are you blowing? The MFG may be the best in the world but if your design is flawed and your computer data is flawed, what out come do you think you will have when the customer tries to use it?
nopity.gif
 
   / Grade 8 shear bolt confirmed! #42  
</font><font color="blue" class="small">( Most of their design work is done on the computers (big computers) by simulating them on the computer screens. You can play with many parameters there on the computers, but you can not make many plane destruction tests which will cost you a lot )</font>
Do you realize that 1) The design cycle for an aircraft is years and takes hundreds of engineers and 2) they do destructive tests also. They also put prototypes through extensive and rigorous tests to prove the design. They do not rely on the computers either. Very few other industries devote anywhere close to the same amount of resources to bring a product to market that the aerospace industry does.
</font><font color="blue" class="small">( Lets consider the stress distribution in a mower in operation is S )</font> Bla, bla, bla, </font><font color="blue" class="small">( 362880 real world tests? None of them )</font>
You obviously are not involved in actual product design. When I talk about parameters, I mean it must be X long, Y wide, and no taller than Z. It must do whatever while complying with this set of regulations. It must do this a minimum of N times in these environmental conditions. And so on. We take these input and start using them to develop a design. We will use computer models to check areas we are concerned will experience high stress locations or where we think that we can remove excess material. We set the contraints as close to the real world loading as possible. Sometimes we will go through this process a few times. We then have the prototypes built and do actual physical tests on them. That's the way it's done and it works.
Listen we've beat this dead horse, I've tried to explain how we, actual design engineers and manufacturing companies, design things. Whether you think it's "ideal" or not really doesn't matter. This isn't a cultural differance but more a "theoretical" vs "practical" issue. Lots of ideas are great in theory and simply just don't work in practice.
 
   / Grade 8 shear bolt confirmed! #43  
GEEZ!!!! Is this thing getting tedious, or what? Whatever happened to the grade 8 shear bolt? It's time some moderator put this thing out of it's misery.
 
   / Grade 8 shear bolt confirmed! #44  
</font><font color="blue" class="small">( This isn't a cultural differance but more a "theoretical" vs "practical" issue. Lots of ideas are great in theory and simply just don't work in practice. )</font>

Yes. And the difference is in our understandings (of engineering.) No problem. Engineers have been discussing these since 16th century when the apple hit on his head of Newton. A side info here: Newton is known more about his F=MxA or F=MxG (where G is gravitational acceleration), but he is less known by "engineers" that he was the first person who introduced "differential formulations." Since this day, engineers are divided into two groups; one of these groups have always considered differential formulations in engineering as "theory" while they have considered F=MxA like a "practical engineering." Both of them are wrong. Engineering itself is an application or "practical" whatever mathematical system you use. So, you consider some mathematical games as theories, but you use them (directly or indirectly) during the design process whether you are aware of it or not. So, we differ here in understanding of engineering. Some other people maybe didn't understand what I meant. Let me make it clearer. Take electrical engineering a kind of engineering playing with the "field laws" or "the energy waves" more than other engineering fields. They frequently use an imaginary number marked "i" (its multiplication by itself is -1, minus 1.) There is no such a real number like "i" in the world, hence it's called "i". Now, the question is that is this number used in practical engineering or in theoretical engineering? Characterizing somethings (parameters and their relations) by some symbols like X, Y, S, S=f(...), Log. Sinus, etc etc isn't a theoretical engineering, but only a game of shortening the talks with less number of characters.

Ps: To me, all science is a practical engineering except (1) Mass&Energy Conservation Laws and (2) Einstein's MxC^2 Energy-Mass relations. Only these two laws; (1) and (2) aren't in engineering field because they can not be proved in the real world (because they are thoughts in the minds.)

Now, as for your practical designing (whatever this is) to determine that X long, Y wide and Z height; Well, to determine them, you are actually calculating the stress distribution behind the scenes. But it's only a geometric design such as placing the goods in a room optimally, then I understand. But this work "usually" doesn't require an engineer.

Ps: CCI, I'll answer your questions only when I find $1541 that I lost a month ago or two. With this $1541, I'll set up an experimental system to develop a shear pin model made of aluminum so that farmers over there will not be breaking many pins anymore. If they are still breaking many pins, there must be a problem. No? By the way, I'll use the slip clutch in my cutter. But I said this before? Yes.
 
   / Grade 8 shear bolt confirmed! #45  
You can not lose what you never had possession of. You need to eat some more of Newton's apples and understand reality of market demands. Turkey is not the market you want to sell in. You must understand the USA laws, demands and culture. Since I know you are also a rugman and sell rugs in the USA, the facts are rotary cutters are not rugs. Eat more apples, Erol Abit
 
   / Grade 8 shear bolt confirmed! #46  
Egon,
Judging from this thread, I would say use the tried and true method of trial and error for selecting your shear bolt. This thread might last till next years harvest /forums/images/graemlins/smile.gif
 
   / Grade 8 shear bolt confirmed! #47  
Yes, Trial & Error method which too has an Error in it like any other method has. As long as it costs little, then I say, go for the shear pin clutch. I'll use the slip clutch for my own cutter as the cost difference isn't big here. Thanks for the discussion. Lets move into detail talk of another subject. EOD.
 
   / Grade 8 shear bolt confirmed! #48  
What is the significance of the $1541 that you mention above?? /forums/images/graemlins/confused.gif
 
   / Grade 8 shear bolt confirmed!
  • Thread Starter
#49  
</font><font color="blue" class="small">( GEEZ!!!! Is this thing getting tedious, or what? Whatever happened to the grade 8 shear bolt? )</font>

I replaced it with a Gr 2 /forums/images/graemlins/wink.gif. I thought it was a straight forward topic - just trying to call attention to a potentially damaging situation. This thread seemed to take on a life of its own!

Brad
 
   / Grade 8 shear bolt confirmed! #50  
Love those differential equations. Pick the right one and you can spend your whole life trying to work it out and then check out with nothing to show for a lifes labour.

Egon
 
 

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