VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 09-22-2016, 12:21 PM
Vansrv7arob Vansrv7arob is offline
 
Join Date: Dec 2010
Location: Coal Point, Australia
Posts: 128
Default Vans engineers having a laugh

https://youtu.be/b2uocqifBSk

Classic
__________________
Regards,

Rob.
................__|__
......______(-o-)______
................./ ' \.

M: (61) 401 578 700
Reply With Quote
  #2  
Old 09-22-2016, 01:54 PM
BenNabors BenNabors is offline
 
Join Date: Mar 2014
Location: Alabama
Posts: 127
Default Little Mark

I had a guy working for me and his nick name was "Little Mark." I asked him what was the source of the nick name and he said: Right out of high school the foreman sent me to go take a measurement, I climbed up the latter and called out - 121 inches ...... and 9 little marks.

So I call the Van's CAD guy: Little Mark.

I see the crazy tolerance markings all over the plans, but they are fun to try to and achieve. So how do you mark 1/64"? Mid point between the 1/32 marks.
Reply With Quote
  #3  
Old 09-22-2016, 02:01 PM
DaleB's Avatar
DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
Default

Quote:
Originally Posted by BenNabors View Post
I see the crazy tolerance markings all over the plans, but they are fun to try to and achieve. So how do you mark 1/64"? Mid point between the 1/32 marks.
How do I mark 1/64"? With a Sharpie!

Of course I've tried marking with a Sharpie, then lightly scribing the precise location on the part. Then center-punch -- oops, it's about 1/64th off -- drill -- dang it!! Drill press wandered off another 1/32 in the other direction... and it ends up "in the vicinity". I eventually learned to offset the work in the drill press to keep that part to a minimum.
__________________
Dale

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
Reply With Quote
  #4  
Old 09-22-2016, 02:16 PM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
Default

I get the same thing at work. I submit drawings to the shop with 1/64" tolerances, I go out on the floor and watch them measure it to 1/16", mark it with chalk to 1/8", and then cut it with a torch that has 1/4" kerf.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Reply With Quote
  #5  
Old 09-22-2016, 02:51 PM
Dean_aeroleds's Avatar
Dean_aeroleds Dean_aeroleds is offline
 
Join Date: Aug 2007
Location: Boise, Idaho
Posts: 468
Default

Yes, the per each hole placement accuracy isn't to 1/32 of an inch, but if there are 32 holes along that edge, they do need to be roughly spaced at 1 and 1/32 because by the time you get to the end of that row of holes, 32 holes add up to an additional 1 inch, so if you spaced them at 1 inch you'd have a 1 inch gap left at the end of the row. I think that is the reason for the 1 and 1/32 call out.
Reply With Quote
  #6  
Old 09-22-2016, 03:50 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
Default

How many beer did he have when he was making this video?
__________________
Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
Reply With Quote
  #7  
Old 09-22-2016, 03:58 PM
E. D. Eliot E. D. Eliot is offline
 
Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
Default Engineers

Not calling anyone out here. Engineers are engineers - they deal with 1/000s of an inch sometimes (like when they send instructions to the machines that 'punch' out the critical pieces of our kits. Its a mind set. They are taught to be as accurate as possible. I like that.

I strive, like most, to be accurate but when I fail, I don't worry about it if I'm off by 1/64 or 1/32 if the part dimension is not critical. It the measurement is critical, its time to purchase a replacement part and get it right with the next new part.

I've known a few engineers and almost without exception, the ones who have spent some time building what they have drawn out have respect for those of us who are building what they have specked out. The ones who bug me are the ones who have no respect for us who build their projects. I think that most or all of Van's engineers respect us builders and try to spec out the measurements as accurately as possible. I like that too.
__________________
Building finally
Reply With Quote
  #8  
Old 09-22-2016, 05:13 PM
plehrke's Avatar
plehrke plehrke is offline
 
Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,674
Default

The dimension on the drawing has to be something. 1" or 1 1/32" what's the difference, you still need to use a scale and measure it to 1/32" accuracy. I found it to be no additional work to measure and mark to 1/32. As mentioned in a previous post, The tolerance stack up starts with the measurement, gets worse with the mark, center punch, and drilling. Minimize error at each step and you will be amazed at how much better it fits together. Be off high at each step and you will be short ED.
And yes, I am a aerospace design engineer.
__________________
Philip
RV-6A - 14+ years, 950+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
Reply With Quote
  #9  
Old 09-22-2016, 05:27 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
Default

Not an engineer of this type but I would imagine that they use CAD and have the program space the rivet holes appropriately and these measurements is what the program will come up with. Nothing wrong with providing a more accurate measurement and let people do to their best of their ability to adhere to it. Besides, if you have 32 of these rivets in a row and rounded off by 1/32, now you have put one less rivet.
__________________
Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
Reply With Quote
  #10  
Old 09-22-2016, 07:40 PM
mike newall's Avatar
mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,052
Default

We have to thank modern technology, modern practises and a little bit of irony in this.

Now, as a Brit, we understand irony, not usually an understood thing in the Colonies.... But.

There is an interloper.

There is a Brit in Vans and we think, possibly, that his wit and wisdom is seeping into the very fabric of the organisation.

Why would you see an instruction in the 12 plans to use a 'metric crescent wrench' to - err facilitate the longerons ?

Come on chaps (and chappesses), the Engineers are playing with us.

They must sit with their Pabst beers, maybe Milwaukee, will will defer, and say - hey, how can we p1ss these guys off with using such tiny, weenie measurements as to sent them insane ?

It is Engineer amusement.

Let us all laugh collectively, let us all raise a glass of weak, domestic lager to them and say - thanks guys, thanks for making the best designed, the best supported and the best flying Experimental airplanes on the market today.

Rejoice, do not criticise.......
__________________
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

Donated in 2020
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 03:48 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.