Author Topic: Science Experiment.  (Read 1440 times)

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Offline Doc Brown.

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Science Experiment.
« on: June 01, 2013, 01:30:00 PM »
I put a Spanish made cannons trunnion through the ringer. Its not interferenced in. Its only epoxyed. Next I will be doing an interferenced trunnion so stay tuned.
By the way I had a major brain storm. Anyone ever try to use a stud gun and machine a stud smooth. Fuse the stud to the barrel then press a bushing over the stud to form a sholder along with an interference fit?
 
Its my opinion that for this small of a cannon barrel epoxy would be fine. For something big NO WAY

Offline Double D

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Re: Science Experiment.
« Reply #1 on: June 01, 2013, 03:13:04 PM »
That's scary!

I wouldn't trust epoxy for sure. 

Offline seacoastartillery

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Re: Science Experiment.
« Reply #2 on: June 01, 2013, 04:00:33 PM »
     Well I'm glad someone else is doing a few experiments.  BRAVO!  Dockholiday, don't let the nays sayers (family and friends) stop you.  Keep up your experiments, if only to inform the few of us who give a darn about learning something new occasionally.  By the way, Kansas Cannons makes a point to tell everyone that they use a form of epoxy called JB Weld to hold their cannon trunnions in a socket in the tube just as you did.  They are listed on our sticky list here as a vendor right near the top of the list.  We have seen them and their cannon display at the huge Wannamaker Gun Show with 3,800 tables in Tulsa twice a year for as many years as I can recall.  Now they must be doing something right to have the success that they do.

     These are no firecracker cannons with miniscule recoil either.  They are described by the vendor as:

                       
Barrel lathe turned and bored, trunnions set in milled pockets in barrel and J.B. Welded in place.
A great cannon to fire or set on a large mantle or corner of a room.
1.7" bore with a 1" powder chamber. Barrel alone weighs 20 pounds.
18" long with a nearly 3" base ring"


     They say these are Signal Guns, but the wink wink is a picture of a golf ball next to the cannon.  These trunnions have to be tough.  I can get a twenty lb., feather weight, cannon to do back flips with a 1" chamber and just a regular golf ball!

We will be watching the rest of the series.

Tracy
             
Smokin' my pipe on the mountings, sniffin' the mornin'-cool,
I walks in my old brown gaiters along o' my old brown mule,
With seventy gunners be'ind me, an' never a beggar forgets
It's only the pick of the Army that handles the dear little pets - 'Tss! 'Tss!

From the poem  Screw-Guns  by Rudyard Kipling

Offline Double D

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Re: Science Experiment.
« Reply #3 on: June 02, 2013, 05:17:03 AM »
Yes agreed don't stop the experiments.  The glued in trunnion was a good one.

Now try it just press fit, solder, braze, threaded.

Also go into a ballistic program and generate recoil energy and try to duplicate that.

 

Offline MKlein

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Re: Science Experiment.
« Reply #4 on: June 02, 2013, 10:24:35 AM »
Silicone Bronze brazing with tig torch is neat

Try using something like a hole saw just enough to make complete circular slot instead of removing all the meat of the barrel
Turn/bore trunion to be press fit into that circular slot
Drill hole through center of trunion for a screw that is threaded into what you saved by using hole saw
Then countersink trunion so that phillips, allen or whatever style screw can be ground flush with trunion so you won't see it

Just an idea that looks good on paper but haven't tried yet
 


Offline GGaskill

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Re: Science Experiment.
« Reply #5 on: June 02, 2013, 08:40:17 PM »
If you try an annular hole like that, mill the top of the center flat so the trunnion can sit down tight instead of on a curved top of the post.
GG
“If you're not a liberal at 20, you have no heart; if you're not a conservative at 40, you have no brain.”
--Winston Churchill

Offline KABAR2

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Re: Science Experiment.
« Reply #6 on: June 03, 2013, 03:29:11 AM »
 
My Dad was a working as a welder at the Shoreham Nuclear power plant when it was being built.... the plant that never was used..... he told me that engineers were there "experimenting" with epoxying metal together.... it always gives me pause when I hear of people trying to glue metal to metal....I am happy to report that the experiments at the power plant were a dismal failure otherwise some of the newer plants might be glued together rather than welded...... not something anyone needs to worry about when discussing nuclear power.......I think epoxy is an excellent filler but unlike wood metal doesn't have grain or pores for the glues to invade and take hold.... as M&T have said keep experimenting.... I have considered doing a threaded stud that a trunnion could be slipped over and welded through it's center...... have yet to have the time to try it.....
 
Mr president I do not cling to either my gun or my Bible.... my gun is holstered on my side so I may carry my Bible and quote from it!

Sed tamen sal petrae LURO VOPO CAN UTRIET sulphuris; et sic facies tonituum et coruscationem si scias artficium

Offline de_lok

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Re: Science Experiment.
« Reply #7 on: June 04, 2013, 05:16:02 PM »
Silicone Bronze brazing with tig torch is neat

Try using something like a hole saw just enough to make complete circular slot instead of removing all the meat of the barrel
Turn/bore trunion to be press fit into that circular slot
Drill hole through center of trunion for a screw that is threaded into what you saved by using hole saw
Then countersink trunion so that phillips, allen or whatever style screw can be ground flush with trunion so you won't see it

Just an idea that looks good on paper but haven't tried yet
 


Skidmark,
I have been attaching trunnions with this method for over 20 years......... Though some have opinions of what is "best", I have tried about every method (without actually casting them in) over the years and this one has served me well. It is a well engineered and proven design. I have made several hundred cannons with trunnions installed this way without a single complaint or failure. I will post more pics over the next couple days, been really busy around here lately ! ! ;D
Dewayne

Offline de_lok

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Re: Science Experiment.
« Reply #8 on: June 08, 2013, 10:05:06 AM »
Here are some more pics, somewhere I have cad prints of the pocket and trunnion dimensions. I will try to find them, scan them in and post them here...................................
 
Dewayne
 

 

 

Offline MKlein

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Re: Science Experiment.
« Reply #9 on: June 08, 2013, 02:42:43 PM »
Thanks for adding the photos Dewayne! It is always better to have a visual aid.
What type cutter do you use to make the round slot?

Offline de_lok

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Re: Science Experiment.
« Reply #10 on: June 11, 2013, 12:30:43 PM »
Thanks for adding the photos Dewayne! It is always better to have a visual aid.
What type cutter do you use to make the round slot?

My first cutter was a trepan cutter I had sharpened to my specs. They are all done on cnc machine centers now......................................... I also took a picture of one of the barrel prints and trunnion prints I used in 2003.
Dewayne
 

 

 

 

 

Offline MKlein

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Re: Science Experiment.
« Reply #11 on: June 12, 2013, 12:26:51 AM »
  I guess one more option to do this process would be to use an endmill and a rotary table on the mill.
 
manual rotary table, manual rotary tables, manual rotary index table

Offline GGaskill

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Re: Science Experiment.
« Reply #12 on: June 12, 2013, 09:05:03 PM »
That would require additional tooling to hold the barrel.  You might be able to grind a special boring bar for a boring head that would start the groove, and then enlarge it with the boring head adjuster.
GG
“If you're not a liberal at 20, you have no heart; if you're not a conservative at 40, you have no brain.”
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Offline Victor3

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Re: Science Experiment.
« Reply #13 on: June 12, 2013, 11:02:34 PM »
 A quick & dirty trepan tool can be made from an appropriate diameter 2 flute end mill. Grind one flute down and make the other the width of your groove and slightly longer than its depth.


 Just be sure that the X&Y slides are locked down tight when you start your cut. I come up with the knee (also tightened somewhat to take up any slop) rather than down with the quill while doing similar operations.
"It is a capital mistake to theorize before one has data. Insensibly, one begins to twist facts to suit theories, instead of theories to suit facts."

Sherlock Holmes

Offline de_lok

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Re: Science Experiment.
« Reply #14 on: June 14, 2013, 12:04:20 PM »
Also called Annular cutters................................. This one is similar to the one I used for 1/4 scale barrels....................
 
http://www.grainger.com/Grainger/SLUGGER-Annular-Cutter-4WNK8?Pid=search