Bore Crowning

[timeout]

Has anyone used this tool? If so what were the pros and cons? Thanks!

http://www.borkatools.com/pages/mcrt/mcrtytvideo.html

 

[Larryh128]

I haven't used this tool but I watched the video & there is no doubt that it will work as described. If you don't have a lathe or access to one, it probably is not a bad way to go. All of the steps shown can be done quicker on a lathe but the barrel usually needs to be off of the reciever & set up can be anywhere between 5minutes to 45 minutes. It is a well thought out hand tool but you won't have the high polished effect that you can get on a lathe. Big thing is also as shown, liberal use of a good cutting fluid no matter what method you use.

 

[jscandale]

That looks exactly like a Kwikway valve seat cutting tool that I used to use 25 years ago when I worked in a diesel engine machine shop. I was the valve guy, they worked very well. They came in all different angles and diameters and fit on a solid mandrel that fit snugly in the valve guide. I'd be willing to bet that he gets the cutters from Kwikway.

JS

 

[jscandale]

Correction!
In my last post, I said Kwikway. I meant Neway. Kwikway uses stones. I have used both which is why I got them confused.
Here is a link to Neway valve seat cutters...
http://www.newayts.com.au/cutterp1.htm

JS

 

[timeout]

I haven't used this tool but I watched the video & there is no doubt that it will work as described. If you don't have a lathe or access to one, it probably is not a bad way to go. All of the steps shown can be done quicker on a lathe but the barrel usually needs to be off of the reciever & set up can be anywhere between 5minutes to 45 minutes. It is a well thought out hand tool but you won't have the high polished effect that you can get on a lathe. Big thing is also as shown, liberal use of a good cutting fluid no matter what method you use.

I don't have access to a lathe these days. I would think polishing would be relatively easy. Thanks for the reply.

 

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Still looking for someone that has used this crowning tool. Also, what is common practice for a finish after crowning a blued barrel? A hundred years ago I had some cold bluing. Surely there is something better now. Thanks!

 

[Bobby Bailey]

I,ve been using the Manson crowning tool for a while now and really like the results. I have not yet found a "con" for it.
Bobby

 

[timeout]

I,ve been using the Manson crowning tool for a while now and really like the results. I have not yet found a "con" for it.
Bobby

Thanks for the reply! Have you used it on any blued barrels? If so, how did you coat the newly machined surface?

 

[Larryh128]

Brownell's Oxpho Blue.

 

[Larryh128]

The polishing is done as the barrel is turning a fairly high RPM's . Don't hand polish the crown as the results won't be uniform.

 

[Hal]

I would think the Manson Crowning Tool would be way faster to crown with by the time you centered the barrel in the lathe.

Hal

 

[Bobby Bailey]

On most, I don't coat the crowned muzzle. Only if the customer requests it. When I do I use Oxpho Blue.
Bobby

 

[kortik]

That's right, Manson crowning tool is based on Neway technology. I've developed it while working as an engineer for Neway Manufacturing, and offered it to my good friend Dave Manson. Dave, being an incredibly smart and professional fellow, liked it a lot, greatly assisted in fine tuning certain things and now manufactures and sells it under license agreement with Borka Tools. Neway cutter, when used as intented, can make, say, 2" dia. valve seat concentric to the valve bore within 0.001". Needless to say, for much smaller diameters of muzzle end of the barrels, which is typically under 1", concentricity is much higher, and close to 0.0005" or less. I did alter Neway carbide blades in a certain way, as standard blades will NOT work correctly for bores smaller than 0.75" dia. It is 10-20 times faster to do crown with use of this set up than with use of lathe, with equal or better accuracy results, and there is no need to disassemble rifle. It usually takes 2-4 minutes only, with use of electric power screwdriver, or 7-10 minutes with use of hand driver. Hand driver does have some advantage of allowing the user to crown with "fine feel", and can practically allow to get an extreme accuracy in the range of 0.0002"-0.0005" concentricty. For most applications, electric screwdriver with 50-175 rpm will do just fine. Serrated carbide blades will last for a very long time, as those were originally designed to do valve seats, which are typically much more difficult to cut than gun barrels.

Boris (Borka Tools)