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PostPosted: Sat Apr 19, 2014 6:04 am 
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Joined: Sun Feb 10, 2013 1:16 pm
Posts: 1787
Hi,

Most of my crosman 177 barrels have a very sharp start to the rifling. Using a long probe the pellets engage with a very noticeable resistance and almost a 'click' which is somewhat unpleasant in operation, so I was wondering what the best way to smooth this transition would be. Which got me wondering how would one machine the leade in a barrel blank - is there some sort of special bit used, perhaps something like a reamer with a slight conical profile and maybe a guide to ride in the bore?

Regards,
Jim


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PostPosted: Sat Apr 19, 2014 7:47 am 
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Joined: Sun Dec 22, 2013 12:25 pm
Posts: 624
Location: New Mexico, USA
How about this one?

http://www.network54.com/Forum/275684/m ... +-+part+2-


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PostPosted: Sat Apr 19, 2014 7:57 am 
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That looks like something I can try :) I was also thinking of trying a cotton bud coated with lapping compound (Q-tips are a pretty good fit for 177), but both ideas seem a little hit & miss.

Jim


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PostPosted: Sat Apr 19, 2014 6:17 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
Stolen from the GTA, videos by our own Sean Pero....

Quote:
I put together a multi part series on making reamers for chambering and throating. The video specifically covers a throating reamer for a 45-70 but touches on and is applicable to Airguns

Part 1 Making the tool body.
http://youtu.be/ikrS6LiMZOE
(video editing in progress, it will flip the correct way within 24hrs)

Part 2 Hardening the tool
http://youtu.be/FLDKenHq1A8

Part 3 Grinding the cutting flutes
http://youtu.be/xVgitD8fQGo

Part 4
Refining the flutes
(video too big....editing in progress)

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Sat Apr 19, 2014 8:44 pm 
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Wow, that's amazing. I've been wishing I could do case hardening, but I have to say, that looks pretty intimidating.

Many thanks for the links.

Jim


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