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Does anyone know how to sharpen a cooper’s bung bore?

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Forum topic by 0356 posted 10-20-2010 03:13 AM 3181 views 0 times favorited 22 replies Add to Favorites Watch
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0356

15 posts in 2244 days


10-20-2010 03:13 AM

I know how to sharpen the auger but, that conical blade is a bit tricky. How do you make it protrude out enough to grab stock to cut it properly? It seems to all be made wrong; maybe my blade is worn down too much or has been banged in too far. Anyone know anything about this tool?
No guessing or supposing! This is one of those things that either you absolutely have personal experience with or you do not! If you do then you will understand why it is such a problem and if you don’t I will know because you will give me bad advice! LOL I am looking for the correct way it should be done and not what someone thinks is right. Know what I’m saying?
No guessing allowed! :-D


22 replies so far

View Dark_Lightning's profile

Dark_Lightning

2635 posts in 2576 days


#1 posted 10-20-2010 03:23 AM

...cooper’s…bung…bore…hmmm…

backs slowly away from the keyboard…

-- Random Orbital Nailer

View lwllms's profile

lwllms

555 posts in 2749 days


#2 posted 10-20-2010 03:54 AM

Do you want to sharpen the auger portion or the reamer portion? The auger portion is sharpened like any auger bit. The reamer section bevel is sharpened through the opening with a thin single cut file using a draw filing technique. Don’t do anything to the outside because you’ll reduce the height of the cutting edge in relation to the surface of the conical section.

I’m curious. What are you trying to do? I have a drawer full of different tools and shop made tools I experimented with to make conical plane escapements. I tried all kinds of stuff—lead pipe reamers, bung augers, regular pipe reamers, machine reamers and some shop made conical cutters. I finally made some eccentric conical cutters that work well. Initially, I made them for use in a brace but have since cut the square tang off and use them in a heavy duty drill.

I just reread your post and see you just want to sharpen the conical section. Sorry.

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0356

15 posts in 2244 days


#3 posted 10-20-2010 05:10 AM

lwllms; and AtomJack: I have posted this question so many times and you’re the first person I think I have ever had a response back from who did not try to give ma a cheap song and dance. I can’t tell you how refreshing it is to have a straight answer. Everyone wants to tell me what they {THINK} is what I {SHOULD DO} but not what is the right way to do it. I suppose that has made me a bit harsh and bitter. I don’t need to hear guessing or what someone thinks is the way to do it or what they thing is what I want to hear. I need someone who has real genuine hands on personal experience and can tell me what not to do as well as what to do. So, ok then, I have been very careful not to take any material off the outside. I’ve drawn and dragged a very find file in a sliding motion up and down the full length of the blade. I’ve had such an edge that I could shave toilet paper on it but still it will not cut wood. It’s like it only rubs the wood and the blade is set way to low to make the cut. The auger drills in nicely and the very start of the conical bore cuts in well but from that point on it slips and only scraps {at best} and it’s so much work and I have got to push down and twist so hard to produce just the smallest reset tapered bore. I know that the materiel is there to do the job but somehow the blade has lost its set so maybe I need to know how to set the edge. A friend of mine has one that cuts the wood in nice shavings all the way thru and it’s a pleasure to use. He has no idea how to sharpen it either. He was lucky that he got one that was already very sharp. I’m sure he too will soon need to know how to put that razors edge on it again. Several projects I working on are a ladder run engine. It works like a continuous pencil sharpener and creates a dowel of sorts that can be used for rake handles and ladder rungs and chair railing, chair backs, chisel handles and so on. I will also use the bung-bore for the conical hole to receive chair backs and legs. I also wanted to make a thread cutting engine with a tapered entrance for ease of operating. So now I have this wonderful Coopers Bung-bore and the blade scrapes and slips and will not cut and or shave wood at all. What can I do?
Tony

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Dark_Lightning

2635 posts in 2576 days


#4 posted 10-20-2010 05:16 AM

Can you post a picture? I only have a glimmer of what this thing might look like. Note that I’m going to bed pretty soon, as I get up at 3:30 in the morning to go to work, so even if you post a pic it might be Wednesday about 5 or 6 PM before I see it.

-- Random Orbital Nailer

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Moron

5032 posts in 3361 days


#5 posted 10-20-2010 05:29 AM

dont be a fool

buy another one and let another trade sharpen the old one

-- "Good artists borrow, great artists steal”…..Picasso

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0356

15 posts in 2244 days


#6 posted 10-20-2010 05:35 AM

Oh my I just figured out how to post my question and to do it in the right place and now someone wants me to post a picture? How do I post a picture? I’m a simple country boy and computers are so confusing! It’s a common garden variety cooper’s bung-bore like every other one anyone has ever seen. If you don’t know what one looks like then you haven’t any experience with one and you can’t tell me what I need to now. I don’t want or need a guess or an educated guess. I need fact and not guess work. Do you know what I’m talking about? There is only the right way to do it and anything else is guessing and wrong. So again if you don’t know what it is or what it looks like then you simply don’t know the correct answer, Makes sense? Thanks.

View KnotWright's profile

KnotWright

252 posts in 2955 days


#7 posted 10-20-2010 05:38 AM

Is this what we are talking about sharpening?

-- James

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canadianchips

2361 posts in 2464 days


#8 posted 10-20-2010 06:09 AM

The item on the left is coopers adze, the item on right is coopers bung bore bit.

-- "My mission in life - make everyone smile !"

View rivergirl's profile

rivergirl

3201 posts in 2306 days


#9 posted 10-20-2010 01:53 PM

Jesus 0356, go back and re-read your posts. I can’t imagine anyone here, even one who may actually know how to sharpen a “boring bung hole” wanting to respond? It was nice of Canadian to post a pic for you.

-- Homer : "Oh, and how is education supposed to make me feel smarter? Besides, every time I learn something new, it pushes some old stuff out of my brain."

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0356

15 posts in 2244 days


#10 posted 10-20-2010 04:30 PM

Yes it is the item on the right in the picture.

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0356

15 posts in 2244 days


#11 posted 10-20-2010 05:19 PM

Please everyone. I’m not trying to be, mean hearted or ugly to anyone, and so please forgive me and my attitude. You have just got to understand that I have had some really bad experience with people on sites like this. You know how it is right? You ask a question in earnest and you get all the smart mouthed people and or all the do-gooders who want to help and will tell you anything. That’s why I didn’t want to post a picture. You see if you don’t know what a coopers bung bore is or have ever sharpened one yourself then you probably don’t know how to correctly sharpen it. The point is if you haven’t ever done it yourself, then you don’t know how and I don’t want more of someone’s opinion on it. I already know all the wrong ways to do it. So I’m here looking for the right way to do it. Someone please tell me you understand why I am so leery. I want fact and not fiction. How can I get the fact and sound nice too?

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0356

15 posts in 2244 days


#12 posted 10-20-2010 05:24 PM

Oh yes and I never said I wanted to sharpen a bung bore hole!!! Where did anyone see that? See my point is I don’t believe I will get the fact here and I am really non trusting, expecallly after seeing that question from rivergirl!!! Here I will cut and past her remark for you to see she said ((Jesus 0356, go back and re-read your posts. I can’t imagine anyone here, even one who may actually know how to sharpen a “boring bung hole” wanting to respond? It was nice of Canadian to post a pic for you.))
and oh by the way!!! Canadian I do want to thank you for posting that picture in earnest! My fear nos however is that now I will here from people who will see that picture and THINK they know how to help. See I’m not being ugly to you! Please tell me you understand.

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Dark_Lightning

2635 posts in 2576 days


#13 posted 10-21-2010 04:38 AM

YBHBAT. HAND.

-- Random Orbital Nailer

View lwllms's profile

lwllms

555 posts in 2749 days


#14 posted 10-21-2010 05:03 AM

Tony,

You have to understand what you’re asking the tool to do. The conical portion of the bung auger needs to make about every possible kind of cut you can in the wood—with the grain in a flat orientation, against the grain in a flat orientation, with the grain on end grain and against the grain on end grain. To do this, everything has to be right. You’re dealing with bevel angles, sharpness, clearance angle and shaving size all at once. The conical section needs to be slightly eccentric with the cutting edge being the furthest from the center axis. My guess is this is where you’re having a problem but I’d have to mess around with yours to see what’s happening.

There is another type of bung auger that, in theory, should be easier to get working well because you can cut both directions. I’ve included a photo of both types. I never did get the example of the second type I found to work. The one I found, the one in the photo, had been slightly bent prior to my getting it and that may have been the problem. When I dug these out of the drawer today, I was surprised to see that the more common type of bung auger I have hadn’t been as sharp as I had remembered. I could tell because the file teeth signatures were too visible on the bevel. I do remember having it working reasonably well but I can’t remember exactly why I gave up on it. My best guess now is that the angle making up the cone was too acute. It’s been quite a few years.

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0356

15 posts in 2244 days


#15 posted 10-21-2010 05:32 AM

lwllms; thank you for your wonderful post and for posting the pictures. Yes I did forget that there are more than just one type bung bore. That was a serious mistake I made. The one I have is like the one on the left in your picture.
I grew up using this type bung bore as a helper for my grandfather making chairs and stools. His bung bore cut like a plain and the grain didn’t seam to bother it. The only trouble I ever had with his bung bore was the chamber filling up with shavings so often. I know how it can work and should work but I do not know how toput that wonderful edge on it or how to make it dig in and cut like his did.
Sincerity

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