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Cylinder chamfering

This is a discussion on Cylinder chamfering within the Gunsmithing forums, part of the Firearm Forum category; This tool came in the mail yesterday. I want to do the cylinder/chambers on my GP100, but I've never done this kind of work before. ...


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Old May 14th, 2017, 04:07 PM   #1
 
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Cylinder chamfering

This tool came in the mail yesterday. I want to do the cylinder/chambers on my GP100, but I've never done this kind of work before. I'm going to practice on this CA Undercover 38 first. Good or bad, I'll post some pics after.


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Old May 14th, 2017, 04:54 PM   #2
 
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Good luck & keep us appraised on your progress.

One thing I read was go slow & check frequently. As one with little patience, not sure I'm the right guy to do this task.:-)
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Old May 14th, 2017, 05:23 PM   #3
 
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Thanks DO.

Before pics.

There's too little time left this evening to start on it, so the actual work will have to wait til morning.


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Old May 14th, 2017, 07:22 PM   #4
 
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Put the extractor back in. Soak it with oil or cutting fluid. Use your calibrated eyeball.
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Old May 14th, 2017, 07:30 PM   #5
 
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I haven't test fit the tool yet with the extractor in place. But I'll have to check for interference of the tool with the raised portion of the extractor (the part with the dogs/notches, whatever that area is called.

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Old May 14th, 2017, 09:11 PM   #6
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Sheepdog8117, I have the same tool and have used it many times. Chamfered chambers work much better with speed loaders or even single loading. I don't cut very deep, just enough to taper the sharp edge. Here's a photo of a 357 Mag cylinder from a S&W 686. I chamfered the empty chamber on the left. The right empty chamber has not yet been chamfered. It's best if you put spent cases in all the chambers except the one you are working on .... much like in the photo. This will keep the extractor aligned with all chambers so you get good even cuts. Make sure you use the chamber pilot to keep the cut centered and uniform. Make sure you reassemble your cylinder before attempting chamfering.




Here's the same cylinder with all chambers chamfered:


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Old May 15th, 2017, 02:07 AM   #7
 
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Wow, that looks great!! That's exactly what I want to do.

Are you saying to do this with the cylinder fully assembled?

If so, would you disassemble afterward so as to make it easier to verify that you get all the metal particles cleaned out?

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Old May 15th, 2017, 06:10 AM   #8
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Sheepdog8117,
Quote:
Are you saying to do this with the cylinder fully assembled?
Yes, this will keep the extractor (star wheel) in perfect alignment with the body of the cylinder. These reamers are very sharp and cut fast so just be careful you don't cut too deep. Disassembly and cleaning after chamfering is a good idea. It doesn't take much .... just a crumb or two to bind up cylinder rotation.

BTW, if you shoot lead bullets, you will appreciate chamfered chambers even more. No more slices in your bullets from the sharp edge of the chamber.
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Old May 15th, 2017, 06:11 AM   #9
 
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Okay, I did it!! And even got the gun back together...LOL!! Here's a pic.

I couldn't do it with the extractor in place as you can see here:

I was surprised at how many shavings there were after just one chamber:

It sure didn't take much pressure at all for the tool to remove material. I can see how easy it would be to inadvertently remove too much.

I test fit the tool in the assembled GP100 cylinder and it seated just fine, so I'll be able to do the chamber and extractor at the same time.

I'm not sure if I'll get to it today. If not, tomorrow morning. :-)

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Old May 15th, 2017, 06:20 AM   #10
 
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Thank you for the tips, lowegan!

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Old May 15th, 2017, 06:40 AM   #11
 
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When you are all finished, if you want to loan out or sell the tool, let me know. This looks exactly like the problem ive had and now i want to fix mine... thanks for the progress report.

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Old May 15th, 2017, 06:50 AM   #12
 
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It's definitely possible that I'll loan or rent out the tool when I'm done with the GP. My friend has an SP101 that he might want done if I can do a good job on mine. ;-)

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Old May 15th, 2017, 07:01 AM   #13
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Lakehouse2012, I bought my chamfer tool with a 38/357 chamber pilot. Later I broke out my mini-lathe and made brass chamber pilots for other cartridges (shown in the center compartment in the below picture). I also made a set of bore pilots for revolvers in several popular bore diameters from a 22 LR to a 45 Colt (two right compartments). This tool works great for cutting a new crown then following up with some valve grinding compound and a 45 deg brass lap (second from left compartment).

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Old May 15th, 2017, 07:07 AM   #14
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Sheepdog8117, I haven't run into any DA revolvers where I had to remove the extractor due too interference with the ratchets. Looks like you did a good job! Just one more tip .... clean the reamer after each chamber .... crumbs can corrupt your next cut.
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Old May 15th, 2017, 08:13 AM   #15
 
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Thank you lowegan, will do!!

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