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  #1  
Old 04-17-2022, 02:16 PM
gotyoke gotyoke is offline
 
Join Date: Jul 2020
Location: Placerville, CA
Posts: 158
Default Drill runout woes

I'm about to countersink the main spars for the RV-14 wings, but the wobble in my electric drill has me worried. The pneumatic drill is too fast. And my drill press doesn't have enough height. I have already sunk $200 into trying to address the runout of my handheld drill (new chuck = slight improvement, new drill (Makita) = even more runout than the older one).

I'd love some of your thoughts on what I ought to do about this conundrum.
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RV-14A - N74LF reserved
Emp started 1/1/2022 - 65% done
Wings SB started 4/14/22 - 50% done
Fuse ordered - crating Apr '23
Finish ordered - crating Winter '23 (hopefully)
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  #2  
Old 04-17-2022, 02:26 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,499
Default Countersink

Quote:
Originally Posted by gotyoke View Post
I'm about to countersink the main spars for the RV-14 wings, but the wobble in my electric drill has me worried. The pneumatic drill is too fast. And my drill press doesn't have enough height. I have already sunk $200 into trying to address the runout of my handheld drill (new chuck = slight improvement, new drill (Makita) = even more runout than the older one).

I'd love some of your thoughts on what I ought to do about this conundrum.
Set the cage shy of the target and finish by hand. Actually, speed is better. Again, set it shy. You can always cut more.
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Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved
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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  #3  
Old 04-17-2022, 02:47 PM
Mike S's Avatar
Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,496
Default

In the past, I have found that if the countersink has a good pilot then it should take care of the alignment.

Use a bit of lube if the pilot is on the tight side.
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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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  #4  
Old 04-17-2022, 04:16 PM
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PaulvS PaulvS is offline
 
Join Date: Aug 2019
Location: Western Australia
Posts: 1,200
Default Exchange the Makita

If the Makita is new and has runout I would return it and exchange it for another unit, because that is a manufacturing fault. The lack of quality control on mass produced items is annoying, but Makita is usually good. I would take a straight drill bit to the store and check the runout of the replacement unit before you leave.
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Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, fuselage almost done, working on canopy.
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
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  #5  
Old 04-17-2022, 04:28 PM
Richard Connell Richard Connell is offline
 
Join Date: Aug 2006
Location: Sydney Australia
Posts: 402
Default

Remember that the bit pilots in the already installed nutplate.
Runout in the drill isnít going to be a problem unless itís very bad.
Try it out with a K-1100 nut plate riveted to some scrap 063 to convince yourself.
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RV7 VH-XRC Sold :-(
RV10 VH-XRK
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  #6  
Old 04-17-2022, 04:53 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Quote:
Originally Posted by Richard Connell View Post
Remember that the bit pilots in the already installed nutplate.
Runout in the drill isnít going to be a problem unless itís very bad.
Try it out with a K-1100 nut plate riveted to some scrap 063 to convince yourself.
That's a good point. I never use a countersink cage without testing on scrap. Every single time. I don't trust them.
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Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved
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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  #7  
Old 04-17-2022, 05:38 PM
Stevea Stevea is offline
 
Join Date: Jun 2008
Location: San Jose, CA
Posts: 233
Default spar countersink

Just don't go anywhere near the spar parts with the hand drill until you figure out the problem! Practice on some scrap material first, even if it means installing some nutplates on a simulated spar part to practice with.

Or....beg, borrow, or steal the use of a larger drill press to countersink these parts. Even then, practice on some scrap first.

Running some practice parts will show if the runout is/is not a problem. Plus you can figure out the feeds, speeds, countersink depth, and cutting fluid thing too.


Still looking for a "magic drill" that, when reversed, puts the chips back in the hole that I just messed up. Haven't found it yet.
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Steve Allison
RV-6A - sloooowwww build
First flight - 3/8/14
Phase II - 5/19/14

Last edited by Stevea : 04-17-2022 at 05:44 PM.
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  #8  
Old 04-24-2022, 01:31 AM
gotyoke gotyoke is offline
 
Join Date: Jul 2020
Location: Placerville, CA
Posts: 158
Default

For anyone interested, where I landed was I bought a single-flute countersink bit (from Cleaveland Tool), not expecting it to be much better than a three-flute. But I was wrong, that thing is amazing! I got it dialed in on scrap and it was flawless on the spars using the pneumatic drill. Very pleased!
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RV-14A - N74LF reserved
Emp started 1/1/2022 - 65% done
Wings SB started 4/14/22 - 50% done
Fuse ordered - crating Apr '23
Finish ordered - crating Winter '23 (hopefully)
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  #9  
Old 04-24-2022, 09:44 AM
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fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,769
Default

Re: single flute. Just be careful with the single flutes on thin materials. They can pull the material up into the cutter, resulting in a deeper C/S than expected. (a cutting lip vs shaving edges on the three-flute style)
They are awesome though. Very clean cuts and no chatter.
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Venice, FL

N164WM RV-6A Slider/O-360/FP Sold 4/2022
N184WM (RV-8) In final assembly at the airport. Titan IOX-370
N184P reserved (RV-8QB) Empennage kit and QB wings in the shop
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