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Alstone · Moderator & Site Supporter

I’m in the process of building a new QB 78 and getting all the parts together, most bit’s I have in my junk box apart from a stock and scope so I have bought these, with the weather improving I can get back into the workshop and catch up on stuff I have put aside during the winter.

Not being a big fan of the way the QB’s breech looks I have tendered to make a new one for new guns and this is no exception, but with a difference.

Machining a breach is not to difficult job it just takes time setting up, also you have to be careful doing this as one mistake and the job is ruined, and this one I wanted it to be different and easier to make with less machining. So this one utilises the original breech and just provides a cosmetic outer case, this consists of a square block of brass with a ¾” hole bored through the middle, a slot is cut along the bottom to allow the original breech workings to connect to the rest of the gun, all that is needed is a cut out for loading the pellet and a couple of slots for the bolt.

I wanted this one to look different so I went for the modern look smooth and sleek with a nice contrast between the brass and black parts. I just have to cobble the rest of the bit’s together now.

Al

oddtodd · Silver Status Member

You always do such pretty work. I would be proud of it, cuz it looks good.

Big Ern · Veteran Member

That is some amazing machine work Al, it looks beautiful! Can't wait to see the finished product.

Ernesto

rsterne · Moderator

ahhhhhhh.... it's a breech in wolf's clothing.... Mr. Green

Very nice, Al....

Bob

SMP · Silver Status Member

Hmmm

That would certainly be an option for solving the breach riser plate quandary I have been having.

I wish ball end mills or radius cutters were not so expensive.

Nice job Al... Thanks for the brain compost

rsterne · Moderator

Really?....

http://www.wttool.com/index/page/product/product_id/31108/category_id/13874/product_name/2-Flute+Single+End+Ball+Mills+%28WT%29

Bob

Alstone · Moderator & Site Supporter

Glad you like the breech guys. there’s nothing wrong with the original breech and anything you replace it with will be purely cosmetic, so just re-casing the original is easier.

Sean I’m not sure what you are using the ball nosed cutter for, but for cutting the radius on the bottom of a breech I use an boring bar between centres, and make a cutter from an old drill.

Al

SMP · Silver Status Member

rsterne · Moderator

I purchase nearly all my tooling through Wholesale Tool.... waiting for an order right now....

Bob

Alstone · Moderator & Site Supporter

SMP · Silver Status Member

radar · Silver Status Member

That's beautiful, Al. I like the idea of keeping the original breech to avoid unecessary duplication of work.

Alstone · Moderator & Site Supporter

Just a thought, If you want to get a nice gun metal blue on small parts such as screws collars, breeches, muzzle breaks etc, in fact anything that can be heated to just below cherry red, without damaging it, then try heating the item up and drop it into a tin of suds oil, this must be the water soluble type, and you should get a beautiful deep blue effect. This does depend on the suds oil used. Ordinary oil does not work.

If you have a lathe or miller you will have some, so give it a try. All the blueing on the breach was done this way.

Al

SMP · Silver Status Member

Suds Oil?

like Soluble cutting oil
http://www.busybeetools.com/products/COOLANT-WATER-SOLUBLE-4-LITRES.html

or like Murphy's oil soap

Alstone · Moderator & Site Supporter

Sorry about that the term for soluble cutting oil over here is “Suds” the same as Busy Bee sell. I would put a caution on this idea, I have tried it with three different water based coolants and they all work, one other thing is use it neat.

I would try and get a sample first or try some of the local engineering workshops around you they will most probably give you a drop in a bottle. Smile