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 Post subject: Barrel crowning
PostPosted: Fri Aug 21, 2015 7:59 am 
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Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
Is there a member in Calgary who has the proper tools and know-how to crown barrels?
Please PM
Thanks

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 Post subject: Re: Barrel crowning
PostPosted: Fri Aug 21, 2015 12:23 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6015
Location: P.G. B.C.
I don't live in Calgary, but most guys (& gals) have the proper equipment.
It is not rocket science.
You are allowed to use your imagination for smaller bore sizes. Again, it is not rocket science - turning the barrel/gun every few seconds while you rotate your 'tool' guarantees a perfectly symmetrical muzzle crown. The big one in the picture has shot a number of MOA groups at 100 meters using open IRON sights, proof, the crowning method works & is accurate. Note, a lathe can simplify the operation.

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Crowning

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 Post subject: Re: Barrel crowning
PostPosted: Fri Aug 21, 2015 12:52 pm 
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Joined: Sun Jul 15, 2012 10:49 am
Posts: 6029
Location: Victoria, BC and Clarkston, WA
Handyguy wrote:
Is there a member in Calgary who has the proper tools and know-how to crown barrels?
Please PM
Thanks


Whitewolf(Kim) can help you out!

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Crosman 150 pistol .22
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 Post subject: Re: Barrel crowning
PostPosted: Fri Aug 21, 2015 1:43 pm 
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Joined: Thu Feb 02, 2006 11:35 pm
Posts: 3099
Location: Alberta Canada
Sure but at an expensive of close to 4hr rnd trip drive for 5min of work. Not overly practical at these fuel prices.

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 Post subject: Re: Barrel crowning
PostPosted: Fri Aug 21, 2015 4:18 pm 
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Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
Hence the reason I was asking for someone IN Calgary.

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 Post subject: Re: Barrel crowning
PostPosted: Fri Aug 21, 2015 4:26 pm 
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Joined: Tue Jan 29, 2013 6:54 pm
Posts: 2411
Location: Northeastern Ontario
Daryl wrote:
I don't live in Calgary, but most guys (& gals) have the proper equipment.
It is not rocket science.
You are allowed to use your imagination for smaller bore sizes. Again, it is not rocket science - turning the barrel/gun every few seconds while you rotate your 'tool' guarantees a perfectly symmetrical muzzle crown. The big one in the picture has shot a number of MOA groups at 100 meters using open IRON sights, proof, the crowning method works & is accurate. Note, a lathe can simplify the operation.

Crowning

Image


Daryl, can you elaborate on "crowning"? Is there anything else involved in this "crowning" method other than what is presumably the aluminum oxide sandpaper seen in the photograph? Not even a brass screw in a drill with valve grinding compound?

To recrown a muzzle a lathe is most desirable. If a lathe is not available, there are muzzle cutting tools that will do a very good job.
See, for example: http://www.brownells.com/gunsmith-tools ... r_1=MANSON PRECISION
For muzzle lapping tools, see http://www.brownells.com/items/barrel-c ... -tool.aspx


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 Post subject: Re: Barrel crowning
PostPosted: Fri Aug 21, 2015 4:52 pm 
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Joined: Sun Jul 15, 2012 10:49 am
Posts: 6029
Location: Victoria, BC and Clarkston, WA
Never thought of that? I have 3' of 3/8" brass. Could make a whole batch of barrel crown lapping tools. Or even a lease tool? Lease it for $5 and have it returned to me.

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Pardini K10
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Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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 Post subject: Re: Barrel crowning
PostPosted: Fri Aug 21, 2015 5:27 pm 
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Joined: Wed Dec 02, 2009 4:04 pm
Posts: 1078
PM me.


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 Post subject: Re: Barrel crowning
PostPosted: Fri Aug 21, 2015 11:56 pm 
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Joined: Thu Feb 02, 2006 11:35 pm
Posts: 3099
Location: Alberta Canada
A typical round head screw that is slotted will do the trick. Most desirable is brass due to its softness. Lapping compounds vary from tooth paste to baking soda to actual lapping compound. Paste type Automotive polish with do the same.
Yes lathe done is most desired but improvising is half the fun. Keep it simple guys. Just take things slow. Little at a time and a good 8X magnifying glass is benificial to watch for that clean shiny roll over of the rifling.
Just remember put a pellet, bass ackwards 1mm into the bbl prior to starting. Keeps all debri away from the bore and choke. Nice simple clean up, too. But then JMHO.

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 Post subject: Re: Barrel crowning
PostPosted: Sat Aug 22, 2015 11:13 pm 
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Joined: Sat Jan 25, 2014 9:16 pm
Posts: 1271
Location: United States
Handyguy: What kind of gun and caliber is it? The need for a perfect crown varies on the gun, and some come with crowns or muzzle ends that are just inexcusable and need the barrel cut down a bit first. The crown on most airguns isn't all that important so a simple home job using a variety of tools usually works perfectly. Can you post a close up pix of the crown along with the gun info?


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 Post subject: Re: Barrel crowning
PostPosted: Sun Aug 23, 2015 12:51 am 
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Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
Chevota wrote:
Handyguy: What kind of gun and caliber is it? The need for a perfect crown varies on the gun, and some come with crowns or muzzle ends that are just inexcusable and need the barrel cut down a bit first. The crown on most airguns isn't all that important so a simple home job using a variety of tools usually works perfectly. Can you post a close up pix of the crown along with the gun info?

I did try it myself and the accuracy went for crap. Not that it was that good to start with using my selection of pellets.
It's the Archer repeater upgrade for the QBxx in .22

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 Post subject: Re: Barrel crowning
PostPosted: Sun Aug 23, 2015 3:38 am 
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Joined: Sat Jan 25, 2014 9:16 pm
Posts: 1271
Location: United States
Unless you really screwed it up I think it's something else. Like other bore damage, too big of a bore, tight spots etc. Or if using a scope it may be parallax. I attached a pix of the tool I usually use to make crowns. It's just a cheap $1 countersink tool to prep wood for flat screws, but it works great. After I check to be sure there are no burrs left behind, if so I use a scalpel or whatever to remove them. Better guns I'll sand and/or use a different tool to finish it better but it isn't important on cheap low powered airguns.
Try pushing a pellet thru the barrel with a dowel and feel for roughness and tight spots. And use good pellets, no Daisy or anything made in china. Try to use at least Crosman Premier which are usually available locally.
Let me know about that stuff and if using a scope and I'll try to help.


Attachments:
Tool.jpg
Tool.jpg [ 28.77 KiB | Viewed 970 times ]
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 Post subject: Re: Barrel crowning
PostPosted: Sun Aug 23, 2015 8:07 am 
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Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
I have one of these, but I was under the assumption that the angle was too great.

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 Post subject: Re: Barrel crowning
PostPosted: Sun Aug 23, 2015 11:04 am 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6015
Location: P.G. B.C.
A cutting tool as shown, needs perfect alignment or the chamfer will be wonky, technically speaking. :wink: If using the tool pictured and you push the chamfer tool through a denim cloth patch into the crown, this will help prevent chattering- a tip from my Dad. It works. However, a light touch is all that is needed on an air gun - pushing through the cloth might be too much pressure. Such a tip is needed when chamfering CF rifle barrels or ML rifle barrels.

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 Post subject: Re: Barrel crowning
PostPosted: Sun Aug 23, 2015 11:23 am 
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Joined: Sat Dec 17, 2011 10:04 pm
Posts: 525
Location: Komoka Ont.
The brass screw with lapping compound is the easiest and safest way to redress the crown, air gun barrels are softer than powder burners so they don't take much effort to remove material. I use a 10-24 round head screw in my drill press and do a figure 8 with the butt. Put a cleaning patch in the end so nothing gets down the barrel while your doing it.

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