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08-30-2013, 01:47 PM
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Join Date: Aug 2011
Location: McMinville, OR (KMMV)
Posts: 244
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Counter sink area scratches, are they a problem, will they buff out?
I started to countersink the fuel tank skins. I am ending up with lots of scuff marks from the tool. Is this normal? I hope to polish my plane, will they buff out?
I suspect that this is removed material being spun around by the bit.
I may be over analyzing some of this...
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08-30-2013, 04:28 PM
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Join Date: Aug 2011
Location: McMinville, OR (KMMV)
Posts: 244
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better example
Here is a better example. I know the large ring is from the cage, I am concerned about the middle ring and the oval shaped scratches at edge of the CS.

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08-30-2013, 06:21 PM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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Quote:
Originally Posted by mill2978
I suspect that this is removed material being spun around by the bit.
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Yes
Quote:
Originally Posted by mill2978
I hope to polish my plane
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Recommend budgeting for psychotherapy............
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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08-30-2013, 06:47 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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Turning REALLY slow seems to help, and yes you'll scuff those away. But, does anyone have a trick for preventing this?
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Actual repeat offender.
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08-30-2013, 09:43 PM
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Join Date: Jul 2010
Location: Dubai
Posts: 134
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The way I do it is to pull the cage back to the set stop, and then insert the cutter in the hole, I then start to c/ sink until the cage come in contact with the skin. Hope this makes sense
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08-30-2013, 09:46 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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That helps with the cage marks, but it doesn't stop the cuttings from cutting.
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Actual repeat offender.
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08-30-2013, 10:03 PM
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Join Date: Aug 2013
Location: Pensacola, FL
Posts: 43
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First Post
I've been lurking for about a year now...first post.
I put a piece of duct tape on the end of my countersink and cut away the hole in the middle. The bit of tape on the leading edge of the coutnersink seams to prevent scratches. It will get fouled with shavings at some point...a new piece of tape will fix it.
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08-31-2013, 12:07 AM
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Join Date: May 2006
Location: LL10, Naperville, IL.
Posts: 68
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These scratches are more of a problem with single flute countersinks, the kind where the flute is a single hole bored at an angle through the body of the tool. I found that clearing this flute hole of stringy chips after each operation cuts down on scratching. 3-flute countersinks have open flutes so the chips clear from the tool and are less likely to cause scratches. However, these countersinks are more prone to "chatter" if not run at the correct speed and pressure. Practice on scrap will help you figure out the best method for you!
Stewart Willoughby
6, finishing
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08-31-2013, 07:22 AM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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Are you letting the cage spin?
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Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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08-31-2013, 11:48 AM
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Join Date: Nov 2009
Location: SFO Approach
Posts: 204
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dont know if it would work, but perhaps some masking tape over the holes before c/s'ing them?
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