Sooo... Here's where the pattern stands. I completely redid it for more accuracy and detail. Shown here is 1 1/2" scale, but I can print it out here at the shop in any scale up to 5". The geometry around the legs and feet was a BEAR to get right.
Chris
How would you core this?
Moderator: Harold_V
- Adirondack
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- Joined: Tue Aug 23, 2011 6:59 pm
- Location: southern CT
Re: How would you core this?
Adirondack Car & Foundry
Check out our projects: https://www.facebook.com/ADKrail/
Visit our ALL-NEW online store: https://adirondackcarfoundry.square.site/
A little locomotive with 4 wheels on the track is a lot more fun
than a 1/2 finished one with 16 wheels on the bench!
Check out our projects: https://www.facebook.com/ADKrail/
Visit our ALL-NEW online store: https://adirondackcarfoundry.square.site/
A little locomotive with 4 wheels on the track is a lot more fun
than a 1/2 finished one with 16 wheels on the bench!
Re: How would you core this?
Looks great!
Here is a lot of info on using ceramic slurry if you view many of the videos shown on the right : https://www.youtube.com/watch?v=nVZ2PeUd5tw
I did my ceramic slurry work at the local junior college art department, there were lots of older adults enrolled in that evening school sculpture class.
I did RR parts, no need for sculpture; investigate what the local schools are doing.
I did my patterns in foam, most were working in wax, some of my molds have been cast others still wait to be poured.
Being ceramic they will be around for a loooong time.
That big shell mold is for an actual full size bell frame, it will be poured eventually in A319 Aluminum.
I did aquire a good size burn out oven as seen in the last photo.
Here is a lot of info on using ceramic slurry if you view many of the videos shown on the right : https://www.youtube.com/watch?v=nVZ2PeUd5tw
I did my ceramic slurry work at the local junior college art department, there were lots of older adults enrolled in that evening school sculpture class.
I did RR parts, no need for sculpture; investigate what the local schools are doing.
I did my patterns in foam, most were working in wax, some of my molds have been cast others still wait to be poured.
Being ceramic they will be around for a loooong time.
That big shell mold is for an actual full size bell frame, it will be poured eventually in A319 Aluminum.
I did aquire a good size burn out oven as seen in the last photo.
- Adirondack
- Posts: 410
- Joined: Tue Aug 23, 2011 6:59 pm
- Location: southern CT
Re: How would you core this?
Thanks Ronald. This info on the slurry process for investment casting seems very interesting. How many coats did you find that you needed for good coverage? It certainly seems less wasteful of the investment than the typical process. I've been using SILK from the UK and it is not inexpensive.RONALD wrote: ↑Sat Jan 29, 2022 6:29 pm Looks great!
Here is a lot of info on using ceramic slurry if you view many of the videos shown on the right : https://www.youtube.com/watch?v=nVZ2PeUd5tw
This video was suggested after yours, and it seemed helpful as well. https://www.youtube.com/watch?v=W951-Aj6DkU
Thanks for sharing.
Chris
Adirondack Car & Foundry
Check out our projects: https://www.facebook.com/ADKrail/
Visit our ALL-NEW online store: https://adirondackcarfoundry.square.site/
A little locomotive with 4 wheels on the track is a lot more fun
than a 1/2 finished one with 16 wheels on the bench!
Check out our projects: https://www.facebook.com/ADKrail/
Visit our ALL-NEW online store: https://adirondackcarfoundry.square.site/
A little locomotive with 4 wheels on the track is a lot more fun
than a 1/2 finished one with 16 wheels on the bench!
-
- Posts: 599
- Joined: Mon Mar 03, 2014 5:09 pm
Re: How would you core this?
Ronald, this incredibly horrible casting was actually a success! I'm going to try to develop the lost foam technique that you've obviously mastered. I spent all of 5 minutes hand carving a piece of white styrofoam packing with a Dremel and burr ball, then dipped it in paraffin wax to smooth the surface and to fasten the sprue. When the wax hardened I dipped it in a fire clay slurry, let it dry for a few days, packed it in dry sand and poured it in aluminum. I know it's ugly but the pattern was ugly to start with, I was surprised that it came out as well as it did with the materials I had laying around. Now that I have a rough idea about the process I'm going to invest in the proper materials and see if I can hone the skills.