The journal box covers for my Northern trailing truck are brass and have 12 holes for the retaining screws. After drilling the holes, a raised edge was noted on the entrance side of the hole and a more pronounced flashing on the exit side. The first cover did not have any flashing on the exit since it was backed by the Aluminum custom holder that was made to allow indexing of the holes. However, the remaining three covers did due to the drill holes made in the aluminum when the first cover was drilled. Since there is a flange on back side that is close to the holes, how does one debur the hole without making a mess of things? An aircraft mechanic friend was observed spinning a drill bit by hand in holes he had just drilled but the brass is so grabby that it does not work well. Here are a couple of pics.
HJ
Deburring
Re: Deburring
I think the name is counter bore. This is and end mill sort with and interchangeable pilot. The center pilot fits the holes and spun by any means (including a brace) cuts the flash off evenly.
- tornitore45
- Posts: 2077
- Joined: Tue Apr 18, 2006 12:24 am
- Location: USA Texas, Austin
Re: Deburring
I have 4 sizes drill bits (1/16; 1/8; 1/4 and 1/2) mounted on handles. All are stoned with zero rake. A quick turn of the wrist and the burr is out, A bit more pressure and you have a tiny chamfer. For straight edges I scored a small 3 corner scraper.
Mauro Gaetano
in Austin TX
in Austin TX
- SteveHGraham
- Posts: 7788
- Joined: Sat Jan 17, 2009 7:55 pm
- Location: Florida
Re: Deburring
I wonder why people don't use abrasives for this. Sometimes a cutting tool really wants to leave a burr.
Every hard-fried egg began life sunny-side up.
Re: Deburring
I use Noga Rotodrive tools for hand deburring small holes.
http://www.noga.com/Products/sets/Sets% ... t_-_RD2010
I already had the handle for other deburring blades so i just buy the countersinks.
http://www.noga.com/Products/sets/Sets% ... t_-_RD2010
I already had the handle for other deburring blades so i just buy the countersinks.
Glenn
Operating machines is perfectly safe......until you forget how dangerous it really is!
Operating machines is perfectly safe......until you forget how dangerous it really is!
Re: Deburring
I have always used fluteless countersinks in a cordless drill or by hand
Rick
“We make a living by what we get, but we make a life by what we give." Sir Winston Leonard Spencer Churchill (1874-1965)
"Peace is that brief glorious moment in history when everybody stands around reloading". Unknown
Murphy's Law: " If it can go wrong it will"
O-Tool's Corollary: "Murphy was entirely too optimistic"
“We make a living by what we get, but we make a life by what we give." Sir Winston Leonard Spencer Churchill (1874-1965)
"Peace is that brief glorious moment in history when everybody stands around reloading". Unknown
Murphy's Law: " If it can go wrong it will"
O-Tool's Corollary: "Murphy was entirely too optimistic"
-
- Posts: 532
- Joined: Thu May 30, 2013 4:40 am
Re: Deburring
For non-grabby deburring I have Noga, drill bit with the edge stoned, woodworking countersinks for screwdrivers, proper HSS countersinks, and a nice countersinking and chamfering milling tool from Daishowa, the name of which escapes me
(EDIT - Daishowa Center Boy, I made my own holder)
(EDIT - Daishowa Center Boy, I made my own holder)
Re: Deburring
I have always used a carbide ball burr of the appropriate size, mounted in a handle. It makes a nice small chamfer and is easy to turn.
Long ago and far away I had a room-mate that apprenticed at Bausch and Lomb in Rochester, NY and that is a trick he learned there.
--earlgo
Long ago and far away I had a room-mate that apprenticed at Bausch and Lomb in Rochester, NY and that is a trick he learned there.
--earlgo
Before you do anything, you must do something else first. - Washington's principle.