|
|
|
|
Chris Owens - Bearhawk
|
Date: 2-12-2012
|
Number of Hours: 6.00
|
Manual Reference:
|
Brief Description: Deburring the rest of the ribs
|
|
I spent most of the day deburring the rest of the ribs. I finished the center ribs, false ribs, aft ribs, flap ribs and aileron ribs. Once I got down to the aft ribs and related, I had to move from the 2" Scotch-Brite wheel to the 1" version to get into the smaller holes.
The thing about those unitized Scotch-Brite wheels that's a little annoying is the hole for the mandrel isn't perfectly centered. Or it doesn't position itself that way, anyway, when you install it onto the mandrel. You end up with a pretty wobbly critter that's probably approaching 1/8" of center. It takes a few passes to get a reasonably steady groove going so you sheet metal isn't bouncing all over the place. The groove worn into the wheel, as you can see in the third photo, can get pretty deep, so you'll want to try to establish as many good grooves as you can so you can make good use of an expensive wheel. Note that the the 1" wheel below was broken in two because the groove got deep enough to weaking the wheel.
As the groove gets deeper, you can see that it scuffs up the edges further in around the holes and edges during each pass. It's not a huge thing, but I bought AlClad aluminum, and I want to try to keep as much of the coating in place as I can without buffing it all off!
One other thing I discovered that is the mandrels aren't real durable. I attempted to "true up" the wheel by seeing if I could aggressively wear away some of the material with an older wide-tipped flat-blade screwdriver. Well, that was a bad idea. It has no effect on the wheel at all, and I ended up breaking the mandrel. The "corkscrew" that bites into the Scotch-Brite unitized wheel is plastic, and it can't handle that kind of abuse. On the plus side, however, I have a really shiny screwdriver tip.
Another pleasant discovery is that for the smallest hole in the aft rib set (including flaps and aileron), the Unibit (step drill) makes a fantastic deburring tool when weilding by hand.
|
|
Overhead of the whole collection, deburred.
|
|
Another view, along with a few aileron nose ribs.
|
|
The tools of the trade.
|
|
|
|
|
|
|
|
|
Copyright © 2001-2024 Matronics. All Rights Reserved.
|
