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A simple flash hole deburring tool that does not chamfer the hole?

paxamericana

I am looking for a very simple type of flash hole deburring tool that can be lightly used just to knock the burr off of the flash holes inside the cases; but most of the cutting bits of the available flash hole deburring tools seem to be specially designed to cut into the inside of the flash hole and chamfer it. This function is built into the shape of the bit, on many flash hole tools. (That seems to be why these manufacturers make tools that index on the head or some other part of the brass -- because otherwise you might cut too deeply into the case head . ) I don't want to enlarge, or chamfer, or cut into, or
remanufacture the flash hole. I think it is unnecessary. All I need is something very simple that will knock the burr off with a couple of twists without cutting away the inside of the flash hole the way most of the available tools are obviously designed to do. The one exception I have found is the 21st Century flash hole deburring tool, which I can see is deliberately designed to cut off the burr without chamfering the flash hole -- but it would be absurd to pay $100 for a simple tool that does such a simple thing. Does anyone know of a tool that will do this and does not cost $100?
 
paxamericana said:
I am looking for a very simple type of flash hole deburring tool that can be lightly used just to knock the burr off of the flash holes inside the cases; but most of the cutting bits of the available flash hole deburring tools seem to be specially designed to cut into the inside of the flash hole and chamfer it. This function is built into the shape of the bit, on many flash hole tools. (That seems to be why these manufacturers make tools that index on the head or some other part of the brass -- because otherwise you might cut too deeply into the case head . ) I don't want to enlarge, or chamfer, or cut into, or
remanufacture the flash hole. I think it is unnecessary. All I need is something very simple that will knock the burr off with a couple of twists without cutting away the inside of the flash hole the way most of the available tools are obviously designed to do. The one exception I have found is the 21st Century flash hole deburring tool, which I can see is deliberately designed to cut off the burr without chamfering the flash hole -- but it would be absurd to pay $100 for a simple tool that does such a simple thing. Does anyone know of a tool that will do this and does not cost $100?
Click to expand...
This one is the best and will work very well:
www.brunoshooters.com

21st Century Innovation Flash Hole Deburring Tool Bushing Style - 22 Caliber Small | Bruno Shooters Supply

www.brunoshooters.com www.brunoshooters.com
 
K&M advertises that their tool chamfers as well as deburrs. I suppose that many reloaded just use a tool like that lightly, so that they don't end up cutting into the brass to chamfer or enlarge the flash hole, but I guess I might ruin some brass accidentally chamfered the hole when I don't want to.

The Wood River pin vise from Woodcraft.com, plus a drill bit of an appropriate size, looks like an interesting potential diy solution.
 
Why do you want to avoid the chamfer?
It can not hurt anything and may have some positive effects.
I have been doing the chamfering intentionally for a long time and can not prove that it is an advantage, but I have never experienced and negatives.

If you have any experience in fluid flow look up what is called a Sharpe edged orifice and think about how it functions and you may form a positive view of this procedure.
 
If I can't find a simple tool at a reasonable price that will do the simple little thing I need it to do, then I will give up and buy a tool that is splendidly designed to chamfer and enlarge the flash hole (something I don't need or want to do). It just seems that there ought to be something out there that can be lightly used to just knock a burr off the hole. Do we have to overcomplicate everything?
 
There are several tools on the market like the 21st Century tool above - They're essentially an end mill with a guide pin in the center; I have one (maker unknown - bought 25 years ago) and it works well.
 
Go to Harbor Freight and purchase a set of transfer punches. Use the appropriate size with a small hammer to swage the hole.
 
I just use a drill bit larger than the flash hole that will just go thru the case neck and give it a few light turns and done. Any burr is gone and a slight chamfer on the hole. I have done about a billion cases this way.
 
DShortt said:
This site could easily be renamed as Overthinkers Annonymous.
Click to expand...
You may be right but not so much more than a lot of topics that are taken seriously on this forum.

When I first started reloading in the 1960s I was told that flash hole deburring was important and I have heard it many times since but have never seen any data supporting the practice. I have examined many cases and have been appalled at how bad the flash hole burrs look.

It is easy to fix and the cases look better so I do it. I have a technical education and understand aerodynamics so I feel better about doing it and do not think it can do harm.

Making important decisions with insufficient data and rigorous data analysis bothers me a lot more than deburring flash holes.

Best wishes.
 
Has anyone actually proven improvement, if so how, & where, after " primer de burr flash hole"
Group size, documented chronograph readings. We all have our little quirks, or anal thinking about everything we do or try. My question is how or in what way does it improve. Where is the documentation?
 
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