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Post by jray57 on Aug 3, 2010 20:16:38 GMT -5
Not trying to beat a dead horse, but just how did you do it? I have the bit and the countersink but how did you hold the breechplug? Did you use a nut to screw on the threads and hold it in a vise and drill it by hand? If so what is the thread? Or maybe a drill press with the plug in a press vise?
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Post by boarhog on Aug 3, 2010 20:34:42 GMT -5
I did mine in a drill press with a drill press vise. I left the vise loose on the table because my dp chuck wobbles so much. Mostly, I used the vise to try to keep the BP as straight up as possible, and to protect my tender hands if the bit bites too much and spins the BP. I could have probably done as well with your other method of holding the BP in a shop vise, and using a hand drill to do the drilling. You might be able to squeeze the BP between two pieces of wood to hold it and protect the threads. I then used a hand tap wrench to tap out the 10-32 section for the VL. You have to drill that first with the appropriate size drill bit before you tap it. Can't remember the wire size drill to use for 10-32 right now. CRS.
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Post by ET on Aug 3, 2010 21:11:59 GMT -5
Not trying to beat a dead horse, but just how did you do it? I have the bit and the countersink but how did you hold the breechplug? Did you use a nut to screw on the threads and hold it in a vise and drill it by hand? If so what is the thread? Or maybe a drill press with the plug in a press vise? This is how I originally did my BP's using a drill press with small V-Blocks. The Threads are protect with a small piece of brass sheeting.  If I couldn't find the V-blocks I was tempted to make a set out of hardwood and try that for supporting the BP in the drill vise. Hope something here is helpful. Ed |
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Post by shooter on Aug 3, 2010 21:21:59 GMT -5
Not trying to beat a dead horse, but just how did you do it? I have the bit and the countersink but how did you hold the breechplug? Did you use a nut to screw on the threads and hold it in a vise and drill it by hand? If so what is the thread? Or maybe a drill press with the plug in a press vise? This is how I originally did my BP's using a drill press with small V-Blocks. The Threads are protect with a small piece of brass sheeting. If I couldn't find the V-blocks I was tempted to make a set out of hardwood and try that for supporting the BP in the drill vise. Hope something here is helpful. Ed ET,beautifully done that look awesome.  .I may have to try the next one my self. |
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Post by deadeer on Aug 4, 2010 0:40:39 GMT -5
quote "I then used a hand tap wrench to tap out the 10-32 section for the VL. You have to drill that first with the appropriate size drill bit before you tap it. " quote
Boarhog, are you saying you are recessing deep enough that you take out all of the original threads, and then tap new ones? Because I have a couple of existing threads left in the "test" plug, but was thinking it's cut too deep for safety.
Jay
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Post by jray57 on Aug 4, 2010 4:49:59 GMT -5
I have the drill bit and tap for the vent threads from where I tapped the end of a 3/8 aluminum rod to make my ramrod. Does anyone know off-hand the thread pitch on the plug?
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Post by boarhog on Aug 4, 2010 14:38:26 GMT -5
Deadeer,
Yes, on the 3 plugs I recessed, I had to drill with a #21 bit, then tap with a 10-32. The 3/8 bit I used to recess may not have gotten all of the VL threads, but I think it did. I haven't measured the exact depth of my recess. I estimate it to be around 1/2" or a bit more, then the 82* chamfering bit cuts a little deeper.
I just measured the depth of the recess on 2 plugs. With VL installed, they both measure very close to .490 from the BP nose tip to the face of the VL, so I must not have drilled the 3/8 quite as deeply as I thought
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Post by deadon on Aug 4, 2010 17:33:08 GMT -5
Deadeer, Yes, on the 3 plugs I recessed, I had to drill with a #21 bit, then tap with a 10-32. The 3/8 bit I used to recess may not have gotten all of the VL threads, but I think it did. I haven't measured the exact depth of my recess. I estimate it to be around 1/2" or a bit more, then the 82* chamfering bit cuts a little deeper. I just measured the depth of the recess on 2 plugs. With VL installed, they both measure very close to .490 from the BP nose tip to the face of the VL, so I must not have drilled the 3/8 quite as deeply as I thought Boarhog, I just screwed your vent liner into your recessed BP and it fit perfectly. Thanks again, Rusty |
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Post by cuda on Aug 5, 2010 0:00:44 GMT -5
Why are you recessing the vent liner that deep? What is the reason? Thanks. The bp is 11/16 - 16 I think but not sure.
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Post by boarhog on Aug 5, 2010 0:38:46 GMT -5
As far as why, I wanted the recess to hold most, if not all, of the booster powder in duplex loads. I haven't measured to see exactly how much N-110 or XMR-5744 the recess holds, but it looks like it will hold between 10-20 grains. I may try testing that estimate tomorrow, if I get a chance. There has also been some discussion about having a much shorter distance for the primer flame to travel being a good thing.
Seems like I remember the BP threads as being 11/16-11. I'm not as confident in the 11/16 as I am in the 11
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Post by jray57 on Aug 5, 2010 4:48:38 GMT -5
11/16 and16tpi is what the guy at the fastener place told me. Also said it would be very difficult to find. Going to have to use some blocks I guess.
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Post by edge on Aug 5, 2010 7:10:58 GMT -5
11/16 - 16 is the correct diameter and pitch.
MSC Industrial or someplace similar will have a cheapie for about $20.
But you could just as easily drill a 1/2 or 5/8 hole in a piece of 2x4 then saw it in half. Oak would be better and last longer, but for a one or two time use the 2x4 should work fine.
edge.
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Post by Richard on Aug 5, 2010 14:13:57 GMT -5
My plug recessed 1/2" x 5/16" hold 11 gr. of N-110.
Richard
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.I may have to try the next one my self.
