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  #11  
Old 09-22-2016, 07:50 PM
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mike newall mike newall is offline
 
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Further to last and being a little cagey....

Put a search into Google for Stanley RCH tape.

Now,

All I am saying is that some years ago, Stanley - apparently as a Christmas ruse, issued a tape that was calibrated in a very, very fine measurement.

It proved a great hit and many Engineers and Contractors are thankful for the accuracy it gave them.

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  #12  
Old 09-22-2016, 07:57 PM
BillL BillL is offline
 
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A 1/32 - - that means when you make 16 holes the last one is not 1/2" short.

Anyway - most engineers don't have a sense of humor about dimensions no matter how precise they might be.
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  #13  
Old 09-22-2016, 08:47 PM
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The Xenos we're building has all dimensions to the nearest 1/64th - and if you hold to those tolerances, things fit together beautifully. The typical Sharpie line is about 1/32" wide, so yes - you have to place them all very carefully to get things right.
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  #14  
Old 09-22-2016, 08:52 PM
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Quote:
Originally Posted by BillL View Post
<SNIP> Anyway - most engineers don't have a sense of humor about dimensions no matter how precise they might be.
I'm glad you said "most" as I am an engineer and I've known several engineers who have wonderful senses of humor, even about dimensions.

One of my all-time favorite engineer jokes (apx. 40 years ago) was a cartoon of two young 15th century engineers looking at a large set of engineering drawings as a Tower in the city of Pisa, Italy was being built in the background. One engineer says to the other, "I skimped a little on the foundation, but no one will ever know the difference!" 😀
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  #15  
Old 09-22-2016, 09:05 PM
tgmillso tgmillso is offline
 
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Hi Rob,

I see in your video that you interpret the term "typical" specified in the plans as meaning "approximate". This is not the case. In this type of engineering drawing, typ, or typical means that this measurement is common to all relative sub sections of a part. This is commonly used when defining rivet pitch, or distance inboard from an edge, as can be seen in the examples below, rather than having to specify a measurement for each position. You are not alone with this misunderstanding, as I have seen others on this forum make a similar mistake in the past, so I'm just trying to give you and others a heads up.
Regards,
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Last edited by tgmillso : 10-23-2016 at 12:24 AM. Reason: Typo
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  #16  
Old 09-22-2016, 10:58 PM
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Quote:
Originally Posted by tgmillso View Post
Hi Rob,

I see in you video that interpret the term "typical" specified in the plans as meaning "approximate". This is not the case. In this type of engineering drawing, typ, or typical means that this measurement is common to all relative sub sections of a part. This is commonly used when defining rivet pitch, or distance inboard from an edge, as can be seen in the examples below, rather than having to specify a measurement for each position. You are not alone with this misunderstanding, as I have seen others on this forum make a similar mistake in the past, so I'm just trying to give you and others a heads up.
Regards,
Tom.


^^^^^^^^^^
Correct

And, If a drawing is being made for reference to building something, it is rare that the person reading the drawing would be happy with a dimension listed as "not important.... Make it whatever works".

BTW, the canopy on my airplane doesn't leak........
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  #17  
Old 09-23-2016, 04:09 AM
Sam Staton Sam Staton is offline
 
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"Measure with a micrometer, mark with a crayon, cut with an ax."
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  #18  
Old 09-23-2016, 04:13 AM
bobnoffs bobnoffs is offline
 
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to get to the desired end result pull a tape measure the entire length of the layout and keep adding 1 1/32'' to the measurement on the tape. in the end your holes are evenly spaced [i know, obvious and everyone already does it].
vans could just as easily said make 30 holes evenly spaced and YOU would have been the one calling out 1 1/32''.
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  #19  
Old 09-23-2016, 06:03 AM
humptybump humptybump is offline
 
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Quote:
Originally Posted by Ironflight View Post
The Xenos we're building has all dimensions to the nearest 1/64th - and if you hold to those tolerances, things fit together beautifully. The typical Sharpie line is about 1/32" wide ...
Disclaimer: I'm a buyer, not a builder. I'm also "work with wood".

The default marking tool in my shop for the past decade has been 0.5mm mechanical pencil. Unfortunately it's not great on aluminum or polycarbonate.

It's a bummer when the construction tolerances exceed the marking device
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  #20  
Old 09-23-2016, 06:50 AM
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LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
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I was home visiting my 94 year old mother -- why of course I flew my RV-7A halfway across the country to get there; that's why I built an RV-7A -- last month and as we sat on the porch, she decided to go get a book full of recipe's that her mother -- my grandmother -- had put together over the years.

The yellowing paper was so crisp from time that it would break if I wasn't careful turning the page from brown bread to molasses cookies. Man, I loved those molasses cookies.

Everything was there in great detail... baking powder to the teaspoon, sifted flour to the cup, the order in which eggs needed to be folded into the batter.

There was only one thing missing from EVERY recipe:

How much time it needed to bake and at what temperature the oven needed to be.

That wasn't the way they did things back then. You made your recipe and you shoved it in the oven and it was done when it was done.

You know who I thought about at that moment while sitting on the porch with my saintly mom? Paul Poberezny and Tony Bingelis and all those people who built -- not assemble from kits -- airplanes.

Back when I was building -- well, assembling -- my RV-7A, I'd occasionally feel aggrieved by some confusion on the plans or Ken Scott's narrative or whatever. I'd always think about those people who didn't have the luxuries of today. The ones we take for granted.

Assemble on!
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Last edited by LettersFromFlyoverCountry : 09-23-2016 at 04:36 PM.
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