Sharp Internal Edges. CNC.

Noga Liza‑burr Set Noga De...$16.97MSC Industri...

Or this:Noga Hand Deburring To...$18.17Enco

Depends somewhat on the thickness of the tube/pipe, but these can be used to deburr

the inside of the bore.

Thanks Lyn. Perhaps I should have made it plain that I meant bores within bodies which one can get at by using any implement.

Scrapers and emery cloth, then?

"I meant bores within bodies which one can get at by using any implement."

"I meant bores within bodies which one can not get at by using any implement."

How about a picture/drawing/sketch?

I'm curious how one gets "bores within bodies which one can not get at by using any implement." How do you drill the hole in the first place.

Magic

OSS and Lyn, Thanks but Imagine a 100mm I/D bore within which a spill valve has to slide to open and close say 8 channels drilled into the force - each leaving nasty sharp lip to cut an 'o' ring. Camfering each one of what may be a 20 or 30 opening bit of internal kit is very long winded, putting a groove at every point within the bore for each opening to exit into is expensive - so is there an easier way. A blast of 'hot gas' or something?

Portably de-bur why when the title says CNC. And you want it inexpensive! Why not have the CNC do it. With internal chamfer tool. The chamfer will also aid in guiding the o ring as it passes into the hole.

My take on this is that the O-ring passes by the hole, not into it.

Still trying to figure out how you get the hole in an inaccessible place. Nothing makes sense.

I would ask this question over at Practicalmachinist.com.

There are many skilled CNC owner/operators over there, and you may be able to find old posts or ask for ideas to solve this problem.

If your a CNC shop owner, "green cycle button pusher", that site is for you. As well for us manual machine folks that repair broken stuff.

Thanks Ignitor will look.

Flexible hones?

In Bangalore we use Electrochemical deburring for a very similar application. Costs about two cents per component. The deburring is done deep inside a narrow hole. In use an 'O' ring has to pass this hole.

http://www.emag.com/machines/applications/technologies/ecm-electro-chemical-machining/deburring.html

Thanks - Yes I think that is the answer. I will the the link.

Take a large amount of sand or abrasive powder, (small enough to get into the grooves on your part) place in a variable speed rotating drum (small residential concrete mixer) and drop your parts in and rotate drum. You may need to play around with the speed and sand abrasiveness to get your desired result, but it has worked for me with deburring graphite impreged bushings.

Couldn't you cross drill the holes before you machine the bore hole?

Thank you - yes it is an idea but I think one would still end up with 'o' rings 'bulging' across very shape edges as they cross the openings. I think the electric debarring may be the best answer.