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Old 12-19-2007, 06:34 PM   #1 (permalink)
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more time off work, muzzle brake time.

i'm off work again this week because of the weather. time to mess around in the shop. i have had a couple muzzle brake designs in my head for a while. i decided to make one of the designs i had been thinking about. i just used cold rolled steel for this. if i like it i will make it again out of 4130 or 4140. it would take less than an hour to make a duplicate now that i have the program written.

here is what i came up with today:

i didn't take any pictures of it on the lathe but it looked just like this when it came off. i made the bar that is in the chuck to hold the muzzle brake during the milling operations. it is threaded to 3/4-28.



i center drilled and then drilled holes to give the end mill some where to enter.



cutting the ports with a 1/4" end mill.



ports cut.

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Old 12-19-2007, 06:40 PM   #2 (permalink)
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i used a 1-1/4" 6 flute end mill as a face mill to make some flats on the top and bottom of the brake.



one of the flats.



i wanted a 1" hex head at the rear. two flats for a wrench would have been enough but i thought this would look tougher. i kept the 1-1/4" end mill in for this operation.



hex head finished.

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Old 12-19-2007, 06:44 PM   #3 (permalink)
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removing the brake from the 3/4-28 threaded bar.



back view of the brake.



front.



and the side.

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Old 12-19-2007, 06:44 PM   #4 (permalink)
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I'm still jealous. Looks good, whatcha screwing it onto?
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Old 12-19-2007, 06:47 PM   #5 (permalink)
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i couldn't have a shiny brake so i tossed it into the blast cabinet.







i want to stick it back in the lathe and radius the edges on the hex head just a bit.

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Old 12-19-2007, 06:52 PM   #6 (permalink)
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i plan on threading the barrel of my htr so i will use it as a guinea pig testing the effectiveness of my creations. the factory loads in 300 win mag don't bother me but i plan on hand loading some hotter loads in the near future. i need to order a range rod to indicate the bore in the lathe before i thread it.



once the bore of the barrel is indicated in the lathe i will cut the threads. while the barrel is still in the lathe i will thread on the brake and use a boring bar to bore out the holes in the baffles to .015 over the bullet diameter. i will also open up the crown on the brake a little bit more.
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Old 12-19-2007, 06:52 PM   #7 (permalink)
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Looks good. How involved is it to angle the ports back a couple of degrees?
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Old 12-19-2007, 06:55 PM   #8 (permalink)
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Originally Posted by Fisheadgib View Post
Looks good. How involved is it to angle the ports back a couple of degrees?

with my 4 axis mill, it would be pretty tough. i think with something like a bridgeport mill you could angle the head to do it pretty easily.
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Old 12-19-2007, 07:07 PM   #9 (permalink)
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it needs some sort or radius or transition from the round to hex. I liked it "pre-hex" better
as for angling the ports back you could use a dovetail cutter on just the back side of the ports and it would effectively aim the blast back.
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Old 12-19-2007, 07:16 PM   #10 (permalink)
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it needs some sort or radius or transition from the round to hex. I liked it "pre-hex" better
as for angling the ports back you could use a dovetail cutter on just the back side of the ports and it would effectively aim the blast back.
i'm not real sure how i feel about the hex myself. this is just experimenting right now. i am not very concerned with aiming the ports back. from everything i have read, porting directly out the sides is going to work just fine.
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Old 12-19-2007, 07:28 PM   #11 (permalink)
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i want to stick it back in the lathe and radius the edges on the hex head just a bit.
That was my first reaction, but radius and fillets take some time. Looks way better with therm though IMO.
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Old 12-19-2007, 07:39 PM   #12 (permalink)
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Needs more triangulation

When you decide you dont like that one you can give it to me
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Old 12-19-2007, 08:48 PM   #13 (permalink)
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Hmmm, wonder how that would work on a Saiga
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