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  #1  
Old 01-18-2021, 06:36 AM
Roy25101 Roy25101 is offline
 
Join Date: Mar 2014
Location: Jekyll Island, GA
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Default Pre-Puched?

So it's said "it is better to remain quiet and thought a fool than to open my mouth and remove all doubt". Well, here it goes. I just started on the VS of the -14 and my understanding was that many of the parts were now pre-punched to size and no longer required drill to size. I see the parts ending in PP but the instructions are still requiring the VS skin to be attached, all #40 holes drilled, all parts disassembled, and deburred.

I just thought I would ask before diving in. Thanks in advance.....
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  #2  
Old 01-18-2021, 06:42 AM
Ron B. Ron B. is offline
 
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Most are but not all.
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  #3  
Old 01-18-2021, 07:01 AM
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scrollF4 scrollF4 is offline
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When in doubt, drill it out.
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  #4  
Old 01-18-2021, 11:37 AM
Ceetob Ceetob is offline
 
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Location: Canfield, OH
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Most areas where match drilling is needed will be specifically called out in the plans. You’ll find very little of that in the empennage after you complete the VS, the VS is comprised mostly from parts of earlier kits.
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  #5  
Old 01-18-2021, 01:25 PM
Scott Hersha Scott Hersha is offline
 
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My thinking was that “pre-punched” meant punched slightly under size. “Match drilled” meant drilled to correct size. I might be wrong about that. On my pre-punched kit parts, I used a piloted reamer, in assembly, to open the holes up to final size. Reamed holes are perfectly round, and the reamer leaves very little burr.
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  #6  
Old 01-18-2021, 02:14 PM
jacoby jacoby is offline
 
Join Date: Jul 2018
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Quote:
Originally Posted by Scott Hersha View Post
My thinking was that “pre-punched” meant punched slightly under size. “Match drilled” meant drilled to correct size. I might be wrong about that. On my pre-punched kit parts, I used a piloted reamer, in assembly, to open the holes up to final size. Reamed holes are perfectly round, and the reamer leaves very little burr.
My understanding is that "pre-punched" means there are holes there for you, usually undersized. Whether or not they're final sized is up to the piece itself. Most of the 14-specific parts are "final-sized pre-punched" with the 10-specific parts in both "pre-punched" and "final-sized pre-punched" state until the transition to offering only final-sized holes is complete.

"Match drilling" is a completely separate operation that involves drilling a new hole in one or more parts to mate up (match) with another part. Sometimes it's a final-sized match-drill, sometimes it's an under-sized match-drill that gets final-size drilled later.

no matter how you get there, your parts will all be "final-sized" by the time you're ready to dimple and rivet.

I'm building a -10 but here is how I see it:
- 000 prefix (?), it's probably a 14-specific part and final-sized pre-punched
- 10 prefix, it's probably a 10-originating part (except for variations that the 14 gets in the wing) and could go either way depending on DOM.
- 6,7,8,9 prefix, it's designed and spec'd in other models and will (usually) come pre-punched but not final-sized.
- manufactured pieces (angle stock, tubing stock, j-channel), you'll be match drilling.
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