From the Firefly Shops.........

All City Subway Models & Elevated Lines
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Rufus T. Firefly
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Re: From the Firefly Shops.........

Postby Rufus T. Firefly » Sun Oct 01, 2017 10:48 am

J. S. Bach wrote:Looks interesting. Any plans to offer ie as a kit?


I had not planned on doing so, but I guess I could drag out all of the molds if there was interest.
I expect nothing and I’m still let down.

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Rufus T. Firefly
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Re: From the Firefly Shops.........

Postby Rufus T. Firefly » Wed Oct 04, 2017 8:03 am

Mold made and resin poured.....

Image

Now I have sides to work with, :wink:
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J. S. Bach
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Re: From the Firefly Shops.........

Postby J. S. Bach » Wed Oct 04, 2017 10:36 pm

What ends and roof do you plan to use, Pittman?

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Rufus T. Firefly
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Re: From the Firefly Shops.........

Postby Rufus T. Firefly » Thu Oct 05, 2017 7:25 am

J. S. Bach wrote:What ends and roof do you plan to use, Pittman?


My own resin castings -- pretty sure that those were shown in my column 5(6?) years ago.....but I'll post up a photo of those and the drive soon.
I expect nothing and I’m still let down.

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Re: From the Firefly Shops.........

Postby J. S. Bach » Thu Oct 05, 2017 8:57 pm

Nice, probably lost in one of the purges. :(

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Rufus T. Firefly
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Re: From the Firefly Shops.........

Postby Rufus T. Firefly » Sun Oct 08, 2017 8:18 am

J. S. Bach wrote:What ends and roof do you plan to use, Pittman?


My resin castings from long ago in OST and from the kits that I used to sell..........

Image
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J. S. Bach
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Re: From the Firefly Shops.........

Postby J. S. Bach » Sun Oct 08, 2017 7:18 pm

Very nice, especially the ends.

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Rufus T. Firefly
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Re: From the Firefly Shops.........

Postby Rufus T. Firefly » Sun Oct 08, 2017 8:52 pm

J. S. Bach wrote:Very nice, especially the ends.


The mold for those is a "squish" mold that works surprisingly well, once I learned how to actually use it, :roll:

I have 2-3 other molds for ends since I while I can and have scratched together ends from wood, just pulling a pair out of the parts box saves a lot of time and aggravation.
I expect nothing and I’m still let down.

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rogruth
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Re: From the Firefly Shops.........

Postby rogruth » Sun Oct 08, 2017 9:53 pm

Rufus,
What is a "squish" mold?
roger

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webenda
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Re: From the Firefly Shops.........

Postby webenda » Mon Oct 09, 2017 4:11 am

Common molds have pour gates and vents. They are filled with resin after the two halfs of the mold are put together by pouring the resin into the pour gate holes(s).

Squish molds are filled by pouring an excess of resin into one half the mold then assembling the other half of the mold, squishing the excess resin out during the assembly (putting the two halves of the mold together.)

Blue Resin Squished out of Squish Mold.jpg
Blue Resin Squished out of Squish Mold.jpg (34.45 KiB) Viewed 13800 times
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rogruth
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Re: From the Firefly Shops.........

Postby rogruth » Mon Oct 09, 2017 10:24 am

:D :D OK. Makes sense. I think.
roger

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Rufus T. Firefly
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Re: From the Firefly Shops.........

Postby Rufus T. Firefly » Mon Oct 09, 2017 12:26 pm

webenda wrote:Squish molds are filled by pouring an excess of resin into one half the mold then assembling the other half of the mold, squishing the excess resin out during the assembly (putting the two halves of the mold together.


And with a very little bit of practice and learning just how much resin to put in the 1 half. there is then very little excess to squish out.

While the vented molds are useful, the basic squish actually can be more efficient to use for some shapes that would otherwise trap air and ruin the casting.
I expect nothing and I’m still let down.

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robert.
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Re: From the Firefly Shops.........

Postby robert. » Mon Oct 09, 2017 7:19 pm

When casting piece to replace missing bronzes mounts for furniture. I use a vibrating football game to shake out air. For years i bought kits to make my molds. One day my wife says " why do you use that stuff? It's too expensive." She made some molds for me after that. All she uses is silicone caulk and water. A $4.00 tube and water.
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Rufus T. Firefly
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Re: From the Firefly Shops.........

Postby Rufus T. Firefly » Mon Oct 09, 2017 8:12 pm

robert. wrote:When casting piece to replace missing bronzes mounts for furniture. I use a vibrating football game to shake out air.


I rarely have issues with bubbles, but when I think it might be a problem, I put the mold I'm making or the resin I'm casting on the clothes drier and run a cycle. If I'm actually thinking in advance, I'll even do the laundry.

For years i bought kits to make my molds. One day my wife says " why do you use that stuff? It's too expensive." She made some molds for me after that. All she uses is silicone caulk and water. A $4.00 tube and water.


Kits are expensive; I buy resin on 2 lb lots and RTV in 1 lb lots. What does your wife use for resin? How many castings does she get from her molds?
I expect nothing and I’m still let down.

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Rufus T. Firefly
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Re: From the Firefly Shops.........

Postby Rufus T. Firefly » Tue Oct 10, 2017 7:46 am

Here's the drive that's going into this little trolley........

Image
I expect nothing and I’m still let down.


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