Poll

I would buy...

as cast unfinished-rough casting
12 (24%)
as cast finished bore
21 (42%)
fully finished
17 (34%)

Total Members Voted: 50

Voting closed: August 21, 2011, 02:00:56 PM

Author Topic: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar  (Read 27881 times)

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Offline RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #180 on: October 26, 2011, 06:33:02 AM »
CW ,GOW ,
The word investment means 'surrounded ,protected' Just like a banking investment .
 
The wax positive is invested with either a powdered type like plaster of Parris OR like the founderies that use a shell investment is is made up of a serries of dipping in very thin slip to get all detail.
Then sucsecive coats in ever thickening investment ,till it is ready for the burn out .
Then the bronze is poured in .
 
Gary
 
btw the pics are at a bit of an angle as they look abit pointed ,but they are just right .  ;D
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #181 on: October 26, 2011, 08:52:05 AM »
Dave ,you are correct if this works then they will be easier to make the next one.
 
That is the point ,there will be no mold ,as I decided I wasn't going to try a whole new aspect of learning and dealing with pro mold makers and their ways .... ???  The bronze art guys are abit high strung....unlike myself of course ! ;D 
 
Plus no mold parting lines to clean up b4 casting . Cleaner all the way around .
 
So each one will be hand turned on the lathe .
 
Gary
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline GGaskill

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #182 on: October 26, 2011, 09:55:46 AM »
So each one will be hand turned on the lathe.

Sounds like it is time for the CNC lathe.
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 RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #183 on: October 26, 2011, 06:42:29 PM »
 ;)
 
 
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #184 on: October 29, 2011, 12:42:04 PM »
Yesterdays work went well . Here #2  ;D

 
Bore

 
Gary
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline GGaskill

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #185 on: October 29, 2011, 12:59:00 PM »
Are we going to add rimbases?
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 RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #186 on: October 29, 2011, 01:40:09 PM »
Yes and they were added today .
Gary
 
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline GGaskill

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #187 on: October 29, 2011, 02:30:34 PM »
Great.
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 RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #188 on: November 30, 2011, 11:50:16 AM »
Hello all I got THE call today that the mortar was ready ! It looks real good are here are first photos .
 

I'll clean her up abit and get her off to Douglas .

The foundery says they think they can cast these flaw free .

 
I will order some more wax and start making some and we'll see how it goes . No firm price yet as it isn't done yet .
Gary
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline GGaskill

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #189 on: November 30, 2011, 12:03:22 PM »
Did they check the bore with a golf ball?
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 Spuddy

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #190 on: November 30, 2011, 12:41:13 PM »
Ahhh Rocklock is back.  Looking good Gary.
 

Offline flagman1776

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #191 on: November 30, 2011, 12:44:34 PM »
Looking very good. 
Thankyou for all your efforts & keeping us posted.

Offline Cannoneer

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #192 on: November 30, 2011, 02:34:08 PM »
It looks fine, Rocklock. Were the bore and chamber cast around a core on this one?
RIP John. While on vacation July 4th 2013 in northern Wisconsin, he was ATVing with family and pulled ahead of everyone and took off at break-neck speed without a helmet. He lost control.....hit a tree....and the tree won.  He died instantly.

The one thing that you can almost always rely on research leading to, is more research.

Offline RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #193 on: November 30, 2011, 03:57:44 PM »
Thanks , yes Geroge it is Golf ball certified .  ::)
 
Tim ,I've been around but have had some other hobbies that I have been pursuing . :o
 
Flagman you are welcome ! ;D 
 
Cannoneer the bore and chamber where cast in place . More pics tomorrow IF I can get to Seacoast . Big snow is predicted ..... But you know how they lie !
 
Gary
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline GGaskill

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #194 on: November 30, 2011, 04:45:42 PM »
Were the bore and chamber cast around a core on this one?

Not a core in the sand casting style, but the investment was inside the pattern and formed the cavity.  The wax pattern gets melted out of the investment, which is fired hard to make the mould; then the liquid metal is poured into the cavity where the wax was.
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 Mike H.

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #195 on: November 30, 2011, 09:30:59 PM »
That looks real nice. Do you have a shot down the bore with it well lit?

Offline Cannoneer

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #196 on: November 30, 2011, 10:10:59 PM »
You're right GG, for some reason I was thinking about sand casting, probably because of the other current 'casting' thread on the TN foundry.

What I was really curious about is how the bore and chamber turned out with this foundry, the first place didn't do too well. Will any work need to be done on it, or is the bore/chamber pretty much good to go right from the foundry? 
RIP John. While on vacation July 4th 2013 in northern Wisconsin, he was ATVing with family and pulled ahead of everyone and took off at break-neck speed without a helmet. He lost control.....hit a tree....and the tree won.  He died instantly.

The one thing that you can almost always rely on research leading to, is more research.

Offline GGaskill

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #197 on: December 01, 2011, 10:56:37 AM »
I think it is the same foundry, just a little more careful in cleaning the casting this time.  And a less complicated pattern, too.
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 flagman1776

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #198 on: December 01, 2011, 11:06:15 AM »
I believe reply #119 indicates a move to a second foundry.  If there's been something since, I'm not seeing it posted.   

Offline RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #199 on: December 01, 2011, 01:35:48 PM »
This is the new foundery close to home . The first one was from Cody it was battered but is 'usable' it was the test piece .
 
I switched to the foundery in Loveland as I had worked with them in the past . They had cracked investment upon burn out so it was lost wax of the bad kind .
The chamber on this one needs boring out as it has a layer of bronze (at least) plugging it .
 
The foundery is learning . Hopfully plugged chambers will an not be systematic ???
The bore is fine . We had a masive snow storm last night and today (maybe 4 inches ;D )
 
I'll get to Seacoast and finish it up tomorrow .
 
Gary
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline seacoastartillery

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #200 on: December 01, 2011, 03:27:16 PM »
     Hey Gary,  without even looking at it, I am willing to bet you that the unconventional shape of the chamber (i.e., Cylindrical) was the problem here.  Think about it. Looking at reply #184, you can see how small the investment entry hole is.  If you decide to improve this condition, a simple change in the shape of your wax drilling, spade drill to a Gomer Chamber shape would allow easier entry for the investment material, because a cone shape with the large end up would facilitate it.  See the line drawings below for a clear comparison of the two styles of chamber. 

     I'm speculating here, but I would almost bet that you will find solid bronze below the point of intersection between the Ball Seat and the Chamber Mouth.  This means that there was an air bubble below that point, when there should have been solid investment material.

Tracy

The cylindrical shape you have.  These section drawings are from Gibbon's Artillery Manual.  We bought ours in 1973 and it's a great addition to any artilleryman's library.




The traditional Gomer shape, (conical) which the original Coehorn and many other mortars had for easier loading and fewer cracked and disintegrated shells.



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 RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #201 on: December 01, 2011, 05:21:39 PM »
That would probably help ,it might be why they were invented .
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline Double D

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #202 on: December 01, 2011, 05:30:35 PM »
It also is the type of this mortar had. Didn't my drawing have this type chamber?

Offline Cannoneer

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #203 on: December 02, 2011, 06:29:08 AM »
The original U.S. 24-pdr Coehorn mortars had 'Gomer' chambers.

Here's one of the drawings that DD previously posted.




Drawing posted by GGaskill some time ago.

RIP John. While on vacation July 4th 2013 in northern Wisconsin, he was ATVing with family and pulled ahead of everyone and took off at break-neck speed without a helmet. He lost control.....hit a tree....and the tree won.  He died instantly.

The one thing that you can almost always rely on research leading to, is more research.

Offline seacoastartillery

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #204 on: December 02, 2011, 08:42:59 AM »
     Boy oh boy, I think you are going to love it Double D.  It's really nice looking and the finish is just about perfect!  Mr bronze and Mike are discussing how to set it up for perfect chamber drilling right now.  Oh my, sounds like it's time to leave the shop.  Very loud discussions are occurring now.  EEEEK. I hear two air nozzles shooting end mill tubes now.  I guess who ever has fewer welts on his head wins the argument!  Don't worry DD, when they actually start running the mill, they will be in agreement.   >:( :)   Well maybe?   :) :)

We will update after the machining is complete.

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: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #205 on: December 02, 2011, 09:24:11 AM »
Hello all I got THE call today that the mortar was ready ! It looks real good are here are first photos .
 

I'll clean her up abit and get her off to Douglas .

The foundery says they think they can cast these flaw free .

 
I will order some more wax and start making some and we'll see how it goes . No firm price yet as it isn't done yet .
Gary

I missed this....it's coming to me. Kool!  For some reason, I didn't realize that.  I thought this was Gary working the project for everyone.  I thought mine was history when the investment  broke at Cody!!!

Now I am excited...thanks Gary!!!

Offline Cat Whisperer

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #206 on: December 02, 2011, 01:13:43 PM »
How about a SWAG estimate guess on price?

50 cents
100 $
1000$

Tim K                 www.GBOCANNONS.COM
Cat Whisperer
Chief of Smoke, Pulaski Coehorn Works & Winery
U.S.Army Retired
N 37.05224  W 80.78133 (front door +/- 15 feet)

Offline RocklockI

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #207 on: December 02, 2011, 01:34:04 PM »
Wow I acually made one ! 8)
Doug has insisted  on a .178" vent so he can use the straw quills .
Here are both sides


Down the muzzle shot ,the bronze blockage was solid ,

 
Gary
"I've seen too much not to stay in touch , With a world full of love and luck, I got a big suspicion 'bout ammunition I never forget to duck" J.B.

Offline GGaskill

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #208 on: December 02, 2011, 01:52:49 PM »
Down the muzzle shot; the bronze blockage was solid.

Gives you an excuse to drill with a ball nose end mill.
GG
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--Winston Churchill

Offline Double D

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Re: Group buy-group pour, bronze 24 PDR Coehorn golf ball mortar
« Reply #209 on: December 02, 2011, 02:33:20 PM »
Of course .178 diameter.  Standard over the counter green cannon fuse  is 1/8.  Quills are 4mm.   Standard fare and their no reason for smaller, none.