cheapy and quickie girders

[FJ and G]

Girder Bridge

 

Cost for RTV to make mold: $7

 

Cost for each 12” section of Resin: $2

 

Time to make master: 4 hours, including making rivets on cardstock, gluing coffee stir sticks and sealing

 

Time to make resin copies: about 4 minutes to mix and pour and wait time of 1 hour to cure

 

Directions: use spray paint of color of bridge you want to spray in mold. Acts as mold release and paint embeds into the casting. Attach girder to wood with wire nails;

 

Mistake: used what I thought was smooth wood but grain pattern came out in master and castings. To correct the mistake, simply made small batch of RTV and skimmed over the surface to fill in the wood grain impressions. RTV sticks to RTV so RTV repairs can only be made with RTV as nothing on earth sticks to dried RTV.

 

 

 

Note the wood grain; I later sanded this casting down and corrected the RTV mold

 

 

2 castings in place (2 feet)

 

 

Curly spokes (handmade)

 

Started with Bachmann wheel casting (casting easier to carve than metal so master is casting), scales to 20 inches in 7/8. Used drill and needle files to make curlies. Didn’t use template. Simply freehand drew curlies on the wheel.

[ttrigg]

OK David, looks like you are having entirely too much fun with this casting thing.  What are you going to cast next? a miniature version of yourself?


Looks good, the more I see you do the more I think about doing the same.  My wife is going to hate you!

[trainboy414]

now that would be cool to see a miniture model of him.

[smcgill]

No the dog!!!

[FJ and G]

the hound might break the mold :-)

 

 

[Anonymous]

the hound might break the mold :-)

 

 

Hey! That is the Boss BB your speaking about!!!!!