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  #1  
Old 10-07-2021, 05:09 PM
ravenstar ravenstar is offline
 
Join Date: May 2021
Location: New Hampshire
Posts: 32
Default How to countersink these holes?

Well, I promised lots of questions a few months back and my first RV-12 kit finally arrived and it hasn't taken long for me to run into my first puzzle: I can't figure out how to do countersink a hole in tight quarters. On page 06-04, step 3 the instructions innocently say to countersink four holes, but two of the holes are next to a flange and my 1" diameter countersink cage doesn't come close to fitting. I don't see any narrower cages online, and I haven't found anyone else mentioning this problem. So how did you all manage to accomplish this step? I've attached the plan diagram and a photo of the actual part. The holes in question are 1/4" away from the flange.

Am I missing something obvious?

Thanks!
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  #2  
Old 10-07-2021, 05:15 PM
TX7A TX7A is offline
 
Join Date: Feb 2005
Location: Abilene, TX
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Default

You could use one of these. (without the cage)
https://www.browntool.com/Listview/t...1/Default.aspx
Get a threaded extension for your drill. Go slow & use Boelube.
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Last edited by TX7A : 10-07-2021 at 05:21 PM.
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  #3  
Old 10-07-2021, 05:57 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,762
Default Threaded drill bit adapter

This little adapter is very handy. Same thread as all the other tools. 1/4-28
https://www.yardstore.com/1-4-thread...-drill-adapter
Chuck it in the drill press. Thread the countersink cutter and very carefully cut the countersink.
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Estes Park, CO
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I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #4  
Old 10-07-2021, 06:31 PM
ravenstar ravenstar is offline
 
Join Date: May 2021
Location: New Hampshire
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Default

I knew it was something obvious. (What do you mean a tool can be used for two different purposes?)

Thank you all!
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  #5  
Old 10-07-2021, 07:29 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Adapter

Quote:
Originally Posted by ravenstar View Post
I knew it was something obvious. (What do you mean a tool can be used for two different purposes?)

Thank you all!
Well. Any 1/4-28 threaded tool can be used in a drill. Imagination.
I also threaded the shaft on my 90 degree adapter. Now it can be jsed as a 90 degree deburring tool by threading it onto the speed deburring handle. Very handy for deburring rib holes.
https://drive.google.com/file/d/0B7h...CjF_k4OrKfi3kA
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Estes Park, CO
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Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
Empennage, wings, fuse, finishing kit, now FWF
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #6  
Old 10-08-2021, 01:42 AM
rv9builder rv9builder is offline
 
Join Date: Jan 2005
Location: Irvine, CA
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If I remember correctly, I did this step by hand using this speed deburring tool.

https://www.aircraftspruce.com/catal...s/speeddeb.php

Instead of using the hole deburring bit that comes with the tool, I used the same countersink cutter that I normally use with a countersink cage. It takes about a minute to countersink each hole, and you can stop turning the handle for a few seconds to check your progress. Practice on some scrap to get the hang of it, but itís really pretty easy.
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  #7  
Old 10-08-2021, 06:32 AM
ravenstar ravenstar is offline
 
Join Date: May 2021
Location: New Hampshire
Posts: 32
Default

Quote:
Originally Posted by rv9builder View Post
If I remember correctly, I did this step by hand using this speed deburring tool.... Practice on some scrap to get the hang of it, but itís really pretty easy.
I have a similar tool so I popped in the countersink bit and drilled those holes in no time. Thanks! I think I prefer the hand countersinking for the control it gives me. I feel silly for not thinking of this myself.
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  #8  
Old 10-08-2021, 09:47 AM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
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I think most people would drill this countersink by hand in some way without a microstop countersink. However, just to put out all the options there are microstop cages available that don't have the full 360 degrees enclosed. There are a few different configurations. The one I'm thinking about only has half a cage so it might work in your situation. BTW I don't have one of these.
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  #9  
Old 10-08-2021, 09:47 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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Default

I canít remember this part. Itís been almost 9 years since I finished my build, but hereís a stupid question: which way is the angle pointing, toward or away from the viewer? Isometric drawings can be confusing. Check the context in which the part is to be used to be sure ou have the correct side to countersink.
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  #10  
Old 10-08-2021, 10:40 PM
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tyconnell tyconnell is offline
 
Join Date: Jul 2007
Location: Keller, TX
Posts: 259
Default

with an adapter, countersink bit in a drill press (no cage). the drill press has it’s own depth stop mechanism. a little fiddling with depth using scrap, but worked well for me.
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