True, and essentially the same geometry one gets from etched brass. However, you miss an important point; Tom's sample project was very carefully chosen to make sure that all the major surfaces on the

True, and essentially the same geometry one gets from etched brass. However, you miss an important point; Tom's sample project was very carefully chosen to make sure that all the major surfaces on the

True, and essentially the same geometry one gets from etched brass. However, you miss an important point; Tom's sample project was very carefully chosen to make sure that all the major surfaces on the

If you use RTV rubber you can go wax to rubber to investment to finished part. Saves a lot of time and a lot of shrinkage. You will have 1 1/2% every time you cast brass. So your original wax wants

Dennis and Andy Y'all have lost me. Wouldn't it be -- RP item --> rubber mold --> resin ? or RP item --> plaster mold --> brass ? Tim "Bozon" O'Connor

part is then used for the vulcanized mold(s). Then you're setting up this progression: wax > ceramic > brass > rubber > wax > ceramic > finished part. That's an awful lot of generations to hold detail

Dennis Clearly the present machines don't cut it. But I looked very closely at the Pullman parts Tom Madden showed at Naperville that were made with a laser type rapid prototyping machine, and to the

Dennis- You only need one RP wax to make an investment cast cylinder. THAT part is then used for the vulcanized mold(s). -Andy Carlson Ojai CA Dennis Storzek <destorzek@...> wrote:

Why vulcanize a rubber mold.? Use RTV rubber That is all I used in all the parts I invested until I went to injected plastic. Thank you Larry Jackman Boca Raton FL ljack70117@... I was born

You want custom driver castings from 3-D printers --- check out Bill Brisko's webpages at www.pacificlocomotive.com Charlie

Rail Shops Inc. (http://www.railshop.net) has announced an HO-scale PRR-PC-CR H30a covered hopper kit to be released 2-JUN-2007. I checked out the pilot injection-molded-styrene H30a carbody casting

here's envision people machines, "vendor" jobber who machining... Tim, Not quite there yet. Here is a photo from the Pacific Loco works web

Tim- This already exists. I consulted with Mark4 Designs on his business model and he offers such a service. www.mark4design.com While there are some issues with tweaking 3D files to get them to

The other problem with the Ertl cars is that they were uniformly weathered.... if all the cars are done on a production line and come out looking identical to each other it sort of defeats the

My take on the Ertl cars wasn't that they were over-weathered but that they were badly weathered. Gray paint applied with several quick passes of an airbrush isn't at all convincing. Most models

Yes. Storey Lindsay Celje, Slovenia

Military Modeling and Model Railroading are not the same Hobbies. I'll go out on a limb here and suggest that Bob Hundman was, as far as his work in Mainline Modeler and N Scale Magazine suggested,

Charlie Yes, even at $2,000 or so they are too expensive for most of us. But here's the thing -- the CAD/CAM data file is the thing -- I can easily envision people going into business as "parts

The 3D printers that are likely to be sold for home use are not going to satisfy most of us on this list. The printers that squirt layers of goop may be okay for making tunnel portals and retaining

Thanks, Jerry! ________________________________ From: STMFC@... [mailto:STMFC@...] On Behalf Of Jerry @ Pennsy To: PRR-Modeling@... Cc: