I need to deburr the inside of a 1/2" hole in a 1/8" AL "C" channel. The hole is in the center of one leg with a 1/4" hole in the center of the other leg. The channel is 1-1/4" Deburring the inside of the 1/4" hole is easy.
If the volume was high enough, I would punch both holes but...
There's a hand tool for that. I don't recall its brand name. It's a hooked scraper that pivots on a handle. It's like your dentist's tooth scraper, bu t the pivot makes it particularly useful for deburring because the pivot mo stly maintains a set angle of its edge against the work.
scraper that pivots on a handle. It's like your dentist's tooth scraper, but the pivot makes it particularly useful for deburring because the pivot mostly maintains a set angle of its edge against the work.
Sure, I have a few...they won't fit through the 1/4" hole. Remember, this is a 1-1/4" "C" channel with the holes in the legs, opposite each other. There is no room.
It has a rod the size of your hole and a small spring-loaded trapezoidal blade on the tip. Used in a drill press. On the way in, it deburrs the outside til the blade springs in. On the way out, it deburs the inside.
I actually have one in 1/2 in, but I couldn't find it if my life depended on it.
Have you looked at the Vargus-Shaviv deburring tools? They have replaceable swivel hooks in a red plastic handle with ground sharp edges for the deburring. Most of them are for one edge at a time, but there is one where the hook forms a 'V' which will debur both inside and outside of a hole at the same time.
Look at MSC number 51538353. The photo does not look quite right, but the description does. They may be using the same photo for several of the tools. (And the handle has changed since I got mine. :-)
You *have* to do it from the 1/4" side? No access from the side where the 1/2" hole is?
It is a matter of the right bits in that tool. The one you want looks sort of like this.
=====[][][]--\ \/
so you put the right-hand end through the hole, pull it to the side so the edge of the metal bottoms in the 'V' and move your hand in a quick circle.
The part to the left is the ratcheted extension shank which goes into the handle, and middle is the quick-release for changing the bits.
If you already have several of the handles, just order the hooks for front/back deburring on holes in sheet metal.
I would go down and grab mine and photograph it to send you a detailed look, except that I'm recovering from a fire in the shop, and everything is rusting and hard to find.
Holy CRAP! They want $27! Locally, they are $11. I guess I'm lucky to have this store 5 minutes away. And, they have a lot of surplus stuff like tool bits and abrasives dirt cheap.
I've seen broadheads that open up on impact. I wonder how difficult it would be to make a deburring tool that could go through the 1/2" hole and open up enough for deburring, then retract. Maybe spring retract and cutting edge would extend like on as centrifugal clutch.
Whoops, misread the original post. Yup, deburring the back of the larger hole can't be done that way. But, there are deburring tools that will do the back of the 1/2" hole easily. I think one of my Royal deburring tools will do it quite well.
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.