gapi Posted August 18, 2015 Posted August 18, 2015 I should have came here first but will post up with what I have so far.No projectiles, just noise.I'm going to post pics of one my Brother has thats been making noiise since 1970. Some of you may cringe and thats OK. The pipe 2" and is cast.He loads it and packs a section of floatie tube kids use in a pool. The noise is tremdous. During fireworks holidays the surrounding area gets quiet for mnutes after he fires a signal. The one I started is 1" bore x 1/2" wall and 23" long. The .measured .997 and the plug measured .999. I am a machinist.The plug is pressed in 2-inches and took 12 tons to get it there. It took 5 tons the 1st 3/8".I plan on weldeing it. I left the inch hanging out for perhaps later ideas. I take it I want to drill a 1/8" or 3/32" hole for the fuse just in front of the plug inside? Maybe a tad forward so the prick will get into the foil? I will be making a bi-pod for it and would like words on that as well if you please. The 23" legnth is how I got my hands on the pipe. It is not a welded seam pipe. Do they make welded pipe this heavily walled. So fire away guys, I know you will advise wisely and not pull any punches. http://alcphoto.net/cannon/my_cannon_04.jpg http://alcphoto.net/cannon/my_cannon_02.jpg http://alcphoto.net/cannon/waynes_cannon_scroller.jpg
dynomike1 Posted August 22, 2015 Posted August 22, 2015 (edited) http://www.go2gbo.com/forums/blackpowder-mortar-and-cannon-sponsored-by-seacoast-artillery/ Edited August 22, 2015 by dynomike1
dynomike1 Posted August 22, 2015 Posted August 22, 2015 looks like you are good at making pipe bombs. Go here and read before you get hurt. Wall thickness needs to be twice the diameter of the bore.http://www.go2gbo.com/forums/blackpowder-mortar-and-cannon-sponsored-by-seacoast-artillery/
gapi Posted August 22, 2015 Author Posted August 22, 2015 Thanks, I hear I can sleeve it. I'm learning the hard way I guess.
marks265 Posted August 23, 2015 Posted August 23, 2015 That 'ol gal thumping since the 70's makes me a believer that it is rigid enough. For your new one I would cross drill and pin the breach plug as well just for added measure. Then plug weld the pin in place. It might be over kill but what the heck. After you weld the plug in place at the end you could always machine some away to pretty it up if you lay down enough initial weld. Maybe machine a ball on the end for looks as well. If you're going to put it on a carriage you may also want to think about installing trunnions before you maybe paint or plate it. Looks like a fun little project to me!
dagabu Posted August 23, 2015 Posted August 23, 2015 The specifications do not fit pipe, this is tubing, electric resistances welded, cold drawn seamless, drown over mandrel or hot finished seamless but not a pipe. Can you provide any other identification for the tube? ERC, CDS, DOM & HFS tube can all have the dimensions you list and the markings on the tube you show are not schedule numbers but more likely lot numbers and material serial numbers (MIL Spec identifiers?). CDS, DOM or HFS are acceptable for a low pressure BP canon but ERW is not. Was the tube completely smooth inside or is there a "hump" inside the tube in one spot? Is it sharp or dull feeling? 12 ton is relatively little pressure to drive a plug, it will immediately gall and give you resistance, add a good charge of BP and it will likely come out the back end since the galling creates "scales" that slow the movement of the plug in but will aid the movement somewhat back out of the rear. Go with the advice by others and cross drill the breach a few grade 8 shanks from bolts, not the threaded part, cut flush (or cut them a little short, 1/16" or so) and weld the ends of the bolts to the tube and turn down to "pretty it up" if you wish. Is this safe? No, even engineered devices can fail, make sure to stand 90° to the breach when test firing. Good luck with your project!
gapi Posted August 23, 2015 Author Posted August 23, 2015 (edited) Thanks, The inside is smooth and has lines I suspect made from being drawn over a mandrel. Definitely not a welded pipe.I polished the inside a little and the plug, and she went in without gauling I'm sure. How does it sound if I:Push the plug all the way in for a 3-inch total depth.Then pin with three pressed in 5/16" hardend dowels flush.Then press on a 6-inch steel sleeve with a 3" OD, boring it out for a .002" press fit, leaving a 1-inch bottom thickness.Then have one of my artist welders lay a roll of dimes weld around it. Would you feel right about it? I want a mortar look. Noise only, no projectiles will be launched. Thanks, Edited August 23, 2015 by gapi
dagabu Posted August 23, 2015 Posted August 23, 2015 Thanks, The inside is smooth and has lines I suspect made from being drawn over a mandrel. Definitely not a welded pipe.I polished the inside a little and the plug, and she went in without gauling I'm sure. How does it sound if I:Push the plug all the way in for a 3-inch total depth.Then pin with three pressed in 5/16" hardend dowels flush.Then press on a 6-inch steel sleeve with a 3" OD, boring it out for a .002" press fit, leaving a 1-inch bottom thickness.Then have one of my artist welders lay a roll of dimes weld around it. Would you feel right about it? I want a mortar look. Noise only, no projectiles will be launched. Thanks, Man! If you do all that, the breach will be bullet proof! Send me a copy immediately for testing!
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