How not to cast a bronze cannon barrel - Graybeard Outdoors
Reply
 
LinkBack Thread Tools
post #1 of 21 (permalink) Old 04-22-2019, 01:50 PM Thread Starter
Super Moderator
 
double d's Avatar
 
Join Date: Dec 2002
Location: Edmond, OK
Posts: 15,826
Default How not to cast a bronze cannon barrel

Title says a lot. But an interesting video anyway. I will watch for his next one.

double d is offline  
Sponsored Links
Advertisement
 
post #2 of 21 (permalink) Old 04-22-2019, 05:28 PM
Senior Member
 
carbineone1964's Avatar
 
Join Date: Aug 2014
Location: Columbus NE
Posts: 1,210
Default

I missed the "not' part at first and was kinda excited I could do that. Up until the heat suit and foundry oven part came along, I thought I could maybe do it too.LOL


Maybe he will try again with better success next time..
carbineone1964 is offline  
post #3 of 21 (permalink) Old 04-22-2019, 05:56 PM
Member
 
moleman's Avatar
 
Join Date: Oct 2015
Location: SW Michigan next to a winter wheat field
Posts: 495
Default

So if he would of built up some plaster coating over the foam would it of held the shape better?

350 Legend, Imitation is the highest form of flattery. Aww, Thanks Winchester!
moleman is offline  
Sponsored Links
Advertisement
 
post #4 of 21 (permalink) Old 04-22-2019, 08:55 PM Thread Starter
Super Moderator
 
double d's Avatar
 
Join Date: Dec 2002
Location: Edmond, OK
Posts: 15,826
Default

Quote:
Originally Posted by moleman View Post
So if he would of built up some plaster coating over the foam would it of held the shape better?
He was not using greensand just regular sand. And he didn't pack it. Not sure the right sand would have made a difference, must be a reason they use it. I think packing the sand tight would have helped.
double d is offline  
post #5 of 21 (permalink) Old 04-22-2019, 09:38 PM
Member
 
moleman's Avatar
 
Join Date: Oct 2015
Location: SW Michigan next to a winter wheat field
Posts: 495
Default

He had a video a while back making an ar10 or 15 lower out of fired brass cartridge cases that looked neat also. If he made the cannon barrel out of the same stuff he must be doing a lot of shooting and not reloading to get that much brass to melt.

350 Legend, Imitation is the highest form of flattery. Aww, Thanks Winchester!
moleman is offline  
post #6 of 21 (permalink) Old 04-23-2019, 03:56 AM
Moderator
 
GGaskill's Avatar
 
Join Date: Jan 2005
Location: Central AZ
Posts: 6,932
Default

Having cast four 1/2 scale mountain howitzers in bronze, I would say his moulding technique leaves a lot to be desired. Although he referred to his sand as "green sand," that may have been its color, not its composition. True green sand is a mixture of sand, clay and water (although not very much) that holds together, especially when it is rammed (compacted.) His sand gave no evidence of that and the fins that developed on the final casting are expansion cracks in my opinion.


He didn't state what his alloy was (obviously copper and tin but unknown proportions.) There are stronger alloys available; I used a silicon bronze alloy called Everdur which is substantially stronger than traditional 90-10 tin bronze and is very fluid as melted which lets it flow into small details.


Here is a thread on my construction and casting. It's from the old forum and the images are missing. I will go back and add links to the images in the next day or two.


I have not yet had time to fix the old thread although I have located the pictures. And I have another comment on his casting procedure. I am not a fan of burnt out foam as a casting method for serious work. It is good if you are doing an investment casting and burn the plastic out in a furnace so the cavity is free of plastic but pouring the liquid metal down into the foam gives you no control over where the metal is going and you will get random solidifications all over the place. It is best to fill the cavity from the bottom at the beginning and raise the fill point as the metal in the cavity rises and his technique does not allow that kind of control.

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

Last edited by GGaskill; 04-28-2019 at 03:42 AM.
GGaskill is offline  
post #7 of 21 (permalink) Old 04-28-2019, 03:39 AM
Moderator
 
GGaskill's Avatar
 
Join Date: Jan 2005
Location: Central AZ
Posts: 6,932
Default

OK, I have replaced all the image links in the howitzer thread mentioned above. They are links now since the current forum software does not allow images from non-https sources.

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
GGaskill is offline  
post #8 of 21 (permalink) Old 04-28-2019, 06:47 AM Thread Starter
Super Moderator
 
double d's Avatar
 
Join Date: Dec 2002
Location: Edmond, OK
Posts: 15,826
Default

Odd that the system won't take your non https link but it will take mine . and you are miles ahead of me in the code thing. Why no .com in your address?



http://www.fototime.com/02D60D17FBBF8A7/standard.jpg

Last edited by double d; 04-28-2019 at 06:56 AM.
double d is offline  
post #9 of 21 (permalink) Old 04-29-2019, 02:30 AM
Moderator
 
GGaskill's Avatar
 
Join Date: Jan 2005
Location: Central AZ
Posts: 6,932
Default

Odd that the system won't take your non https link but it will take mine. And you are miles ahead of me in the code thing. Why no .com in your address?


Perhaps it takes them now. It did not in the earlier days of the current forum software. I will include an http image in this post. My domain is a .info instead of a .com. They were on sale at the time I set up my site so I got a .info. No practical difference I can find.






Looks like it still won't show them.

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
GGaskill is offline  
post #10 of 21 (permalink) Old 04-29-2019, 07:28 AM
Senior Member
 
zulu's Avatar
 
Join Date: Aug 2009
Location: Cypress, Texas
Posts: 3,937
Gun Cabinet
Default

Quote:
Originally Posted by GGaskill View Post
Odd that the system won't take your non https link but it will take mine. And you are miles ahead of me in the code thing. Why no .com in your address?


Perhaps it takes them now. It did not in the earlier days of the current forum software. I will include an http image in this post. My domain is a .info instead of a .com. They were on sale at the time I set up my site so I got a .info. No practical difference I can find.






Looks like it still won't show them.



I can see the photo when I try to reply to your quote.


Another easy way to post pictures is this link.


http://photoposting.is-great.net/?i=2




Click on select.
That will take you to your documents.
Click on the photo you want to post.
Click on "Open".
Copy and paste the IMG to your post.


Zulu

Zulu's Website
www.jmelledge.com
zulu is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Graybeard Outdoors forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome