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 Making my own reamer

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SilverTip
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PostSubject: Making my own reamer   Wed Aug 27, 2014 5:05 pm

I dont know what im doing. So feel free to heckle.

Using 0-1 rod. .5" dia.

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Ive just rough turned it. About 0.010 over its final dimensions.
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Now ready for the grinder (I think?). Not sure what to cut the flutes with. On the mill, or on the grinder.
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PostSubject: Re: Making my own reamer   Wed Sep 03, 2014 7:23 pm

If you're making a D-bit type, and have a mill, use that.  If you prefer standard flutes, you have almost no choice, if you want to get the cutting angles right.
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PostSubject: Re: Making my own reamer   Wed Sep 03, 2014 7:26 pm

Im shooting for 3 or 4 standard flutes. Just picked up a pile of endmills yesterday. Gonna sort through and see what might work.
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northumbrian

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PostSubject: Re: Making my own reamer   Mon Sep 08, 2014 3:10 am

What steel are you using?
I use M2 High Speed Steel for Reamers & Cutters.

I've got an article on making chamber reamers, I'll up load it when I figure out how to do so.
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PostSubject: Re: Making my own reamer   Mon Sep 08, 2014 10:33 am

Super. I'd be very interested in reading it.

Using 0-1 oil rod.
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northumbrian

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PostSubject: Re: Making my own reamer   Mon Sep 08, 2014 10:58 am

O1 will be fine, just don't expect it to last very long.

I'll get the article up after I've found it, I've had a sort out of my desktop and I put it in a folder and now I can't remember which folder it's in!
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PostSubject: Re: Making my own reamer   Mon Sep 08, 2014 12:56 pm

Found it Very Happy
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PostSubject: Re: Making my own reamer   Mon Sep 08, 2014 12:57 pm

Ok just tried to attach it, nothing.....

Help?
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PostSubject: Re: Making my own reamer   Mon Sep 08, 2014 1:03 pm

Headin to the range at the moment. I'll help when I get back.
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PostSubject: Re: Making my own reamer   Wed Sep 10, 2014 6:04 pm

Chamber reamers
Attachments
26802259-Making-Chamber-Reamers.pdf
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PostSubject: Re: Making my own reamer   Wed Sep 10, 2014 6:26 pm

Glad you finally got the article, hope you find it useful
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PostSubject: Re: Making my own reamer   Wed Sep 10, 2014 6:44 pm

I did find it useful. Thank you!
Theres a few questions im still left with. And this one I think will take care of those.

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-Reamers.pdf
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Last edited by SilverTip on Thu Sep 11, 2014 7:47 pm; edited 1 time in total
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PostSubject: Re: Making my own reamer   Thu Sep 11, 2014 2:55 am

D-reamers are fine if your finishing off a chamber, but you really need to cut the chamber with a roughing reamer first, then finish off with a nice sharp finishing reamer.

A rougher for 7.62x54r can be made with 4 flutes, but really needs 5 or 6, and you need to cut a relief to allow for chips to fall off easily.
The cutting faces also need to be broken in order to allow for easier cutting when removing a large quantity of material, which is what the job of a rougher is.

The finisher, needs 6 flutes, and can get away with minimal relief, as you finishing off the chamber not cutting it.

If you really want the highest quality in a chamber you want to a burnishing reamer as well, now this will leave the surface of the chamber very smooth and can get the accuracy of the chamber to extremely high standards, but alas it's not done very often these days.

As I posted earlier, I use M2 Tool steel for my reamers, usually as I tend to want them to last more than one or two uses, but O1 Drill rod is fine.
The tool grinder I use is a Clarkson MkII Tool & Cutter Grinder, I grind the flutes rather than cut them on a mill, as I using M2 HSS I can't really cut them on a Mill.
But you can with O1 Drill rod, and for ease I suggest using a Mill to cut the flutes.

Afterwards I Harden & Temper them in a Carbolite 1300 Furnace, but I would suggest wrapping them in Stainless Steel foil to avoid decarburisation. Unless of course you have access to a controlled atmosphere heat treatment furnace.
I'm looking at making some thin walled Stainless Steel tubes that I can seal and flush with Argon to get all the air out.
Removing the Air when heat treating is essential, as it really can make a mess of your nice new cutters.

After H&T perform a final grind to size and hone the edges.

I've not made any reamers or cutter for a while, as I've not needed to, but I will be needing some chamber reamers soon, so I'll make up some and post the process I use on here.
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PostSubject: Re: Making my own reamer   Thu Sep 11, 2014 2:55 am

Ooooh, just an after thought, what are you doing about the throat?
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PostSubject: Re: Making my own reamer   Thu Sep 11, 2014 7:31 pm

Im not making a D reamer.

Thanks for the details on your method also. That helps alot.
What stone do you use to grind the flutes?

Throat dimensions are the same as a stock 54r reamer.
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PostSubject: Re: Making my own reamer   Thu Sep 11, 2014 7:44 pm

How to make chamber reamers 2
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How_I_make_reamer.pdf
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PostSubject: Re: Making my own reamer   Mon Sep 15, 2014 3:31 am

I use the finest grade, cup/wheel I can get. Usually CBN or a bonded Diamond cup/wheel

That last article, is pretty close to how I do it, but I have a bench top furnace, so no need for a flame.

But if you ever use Carbide, you'll need a cylindrical grinder or a tool post grinder to profile the reamer, and then use a tool cutter grinder for the flutes.
No way to cut carbide with a mill, no easy way.
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