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Old 08-25-2018, 06:51 AM
rv7charlie rv7charlie is offline
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,549

I mark crosshairs through the center, extending well outside the finished hole size. On larger holes, it helps me keep the hole 'in the right spot', since the bit will walk the hole sideways with uneven pressure.
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Old 08-25-2018, 04:04 PM
Sam Buchanan's Avatar
Sam Buchanan Sam Buchanan is offline
been here awhile
Join Date: Dec 2004
Location: North Alabama
Posts: 3,882

If hole location is critical I drill a pilot hole using a conventional bit that is the same diameter as the smallest step on the uni-bit. This and a backing board as mentioned previously eliminates the possibility of the uni-bit walking. A very light touch of the uni-bit with the first oversize step after reaching finished size is a quick way to cleanly deburr the hole.
Sam Buchanan
1999 RV-6
1918 Fokker D.VII replica
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Old 08-26-2018, 08:26 AM
TS Flightlines TS Flightlines is offline
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,212

Ryan---dont hold the piece in your hand. Support it on a bench, in a fixture , in a vise, something. IF the unibit 'were' to grab and bind in the hole, it 'could' twist, AND if you didnt have gloves on, it 'could' create a very hurtful situation. Thin aluminum can be as sharp as a knife---and we certainly dont want to see red stuff on shiny aluminum--or worse.

Yep sometimes in trying to get it done we forget the little things---and they cost us later--. Been there and yep it hurts.

Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC,
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