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  #1  
Old 09-09-2017, 07:07 PM
Richard Connell Richard Connell is offline
 
Join Date: Aug 2006
Location: Sydney Australia
Posts: 136
Default Centre Section Bulkhead #10 Countersink

I think I'm going mad.
Ive drilled all the WD-1021-PC Landing gear mounts to the bulkhead with a #12 drill as instructed.
I need to machine countersink the 2 holes shown for a #10 screw.
My #10 countersink pilot clearly won't go in a #12 hole.
What am I missing?
How do I countersink these holes. Is such thing as a #12 pilot countersink?

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  #2  
Old 09-09-2017, 07:38 PM
berck berck is offline
 
Join Date: Feb 2014
Location: Divide, Colorado
Posts: 20
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Confusingly, you need a #12 countersink cutter, because the cutters are hole sizes not screw sizes.

A #10 countersink cutter is worthless to us, but I suspect that you, like me, got the Cleaveland RV kit which comes with one. It should have come with a #12 countersink cutter for #10 screws, but instead came with a countersink cutter that not only will we not use, but which will confuse us at every opportunity.

I had the same problem at the same time, ordered a #12 cutter.
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  #3  
Old 09-09-2017, 09:52 PM
Richard Connell Richard Connell is offline
 
Join Date: Aug 2006
Location: Sydney Australia
Posts: 136
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Thanks Berck
That makes perfect sense. Thanks for clarifying.
The #10 cutter has been sitting in the tool cabinet unused since about 2003.
Never used it on the -7.
#12 ordered!
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  #4  
Old 09-10-2017, 02:19 AM
Tassie Tassie is online now
 
Join Date: Oct 2014
Location: Cambridge, Tas. Australia
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Default Landing gear mounts

Hopefully you have a large hammer in that toolkit, to beat the landing gear mounts into submission.
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  #5  
Old 09-11-2017, 04:18 PM
Richard Connell Richard Connell is offline
 
Join Date: Aug 2006
Location: Sydney Australia
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Quote:
Originally Posted by Tassie View Post
Hopefully you have a large hammer in that toolkit, to beat the landing gear mounts into submission.
Ha. Not too bad thankfully Adrian.
No issues getting them aligned and drilled on the center section.
But It's early days!
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RV7 VH-XRC
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  #6  
Old 09-12-2017, 08:18 AM
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rvanstory rvanstory is offline
 
Join Date: Dec 2016
Location: New Braunfels
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Quote:
Originally Posted by Richard Connell View Post
I need to machine countersink the 2 holes shown for a #10 screw.
My #10 countersink pilot clearly won't go in a #12 hole.
FWIW, my tool kit (from Isham) had a 3/16" countersink in the kit. I used that and it worked just fine for #12 holes.
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