What to do with old reamers

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What to do with old reamers

This topic has 11 replies, 9 voices, and was last updated 17 April 2021 at 20:00 by old mart.

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16 April 2021 at 15:48 #540066
Ignatz
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@ignatz
Recently, I was lucky enough to purchase quite a number of reamers at a very attractive price. After much cleaning and sorting I found that most were in used but quite good condition (a few evidently brand new) and then of course a small number of them that are evidently dull or so close to it that I dare not use them in anger.

I understand that attempting to sharpen a reamer is a finicky business at best and even if successful you have to make do with the new 'smaller' diameter of said reamer. But that is a moot question as I have no access to the sort of sharpening equipment for such a process.

What I am wondering is what would you suggest I might do with the small number (about thirteen) of otherwise not-to-be-used reamers?

How would you repurpose them?
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16 April 2021 at 15:48 #10803
Ignatz
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@ignatz
16 April 2021 at 16:08 #540070
Anonymous
Depends what sort of reamer. Machine reamers cut on the leading chamfer, not on the flutes. So sharpening the chamfer should restore them to good condition. If they're hand reamers with a long taper it's more difficult to re-sharpen. Irrespective of type if a reamer can't be made to cut to size I'd recycle it.

Andrew
16 April 2021 at 16:15 #540072
Ignatz
Participant
@ignatz
Sadly, most of the dull ones seem to have spiral flutes and a squared off drive notch suggesting that they are hand reamers.

Maybe two or three are machine style reamers (maybe), but what is the technique for sharpening the chamfer?

Does this chamfer sharpening also require special equipment or can one do something simpler like taking them delicately to the bench grinding wheel?
16 April 2021 at 16:44 #540074
David Colwill
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@davidcolwill19261
I have had a couple of jobs that required a number of holes that needed to be reamed to non standard sizes.

The cost of new reamers was quite high and they were not available on eBay. The answer tuned out to be fairly simple. Give the next size up to the local tool sharpening chap and have him resize it. The cost was about £15.00 each.

David.
16 April 2021 at 16:49 #540075
Martin Kyte
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@martinkyte99762
You really can only sharpen the tapered leads between centres on a tool and cutter grinder so you need something like a Union to do it. Even then unless they are very large (and new large reamers are exppensive) and you have the kit don't bother.

regards Martin
16 April 2021 at 17:43 #540084
ega
Participant
@ega
You could try a method suggested to me by a toolmaker friend for dull hand reamers. He advised that running a carbide rod of suitable diameter inside the flute and pressed against the cutting edge would improve matters.

The principle is no doubt the same as raising a burr on a cabinet maker's scraper.
16 April 2021 at 18:10 #540089
Pete Rimmer
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@peterimmer30576
Posted by ega on 16/04/2021 17:43:11:

You could try a method suggested to me by a toolmaker friend for dull hand reamers. He advised that running a carbide rod of suitable diameter inside the flute and pressed against the cutting edge would improve matters.

The principle is no doubt the same as raising a burr on a cabinet maker's scraper.

I've done this to ease the fit on a reamed hole. You don't get much but sometimes it's just enough to make a slip fit really nice.
16 April 2021 at 20:29 #540104
Bo’sun
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@bosun58570
Sounds like it's worth considering. Thanks for the tip.
17 April 2021 at 12:49 #540198
Ignatz
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@ignatz
Well, it sounds like I cannot (easily) save these reamers.

So, assuming I don't just toss them out…

The question remains: What would be the best recycle use for these in the shop?
17 April 2021 at 12:51 #540201
Howard Lewis
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@howardlewis46836
If the machine reamers are beyond hope, they (or part of them )may still have a use. This assumes that the Taper is in good condition.

If the shank is soft enough to allow the Morse Taper to be sawn, or parted off, the MT could be held in the Mandrel taper, possibly with suitable sleeves, and turned to provide a centre, or or as an arbor onto which other items could be fixed, or tapped and used as an arbor for work holding. if needed.

An extra centre can be useful for centering work in a 4 jaw chuck, using the "Two Centres" method, or on a Mill, or a Rotary table or Dividing Head.

Howard.
17 April 2021 at 20:00 #540260
old mart
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@oldmart
You could sell them on ebay as long as the listing was accurate, somebody might want them for resharpening. I would sell as a job lot at, say 50p each, and make sure your postage is covered.
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