Valve Passage Core Box Plug

[jlakes85]

Hi All,

I'm trying to figure out the best way to build up a new parting line to mold this odd shaped core plug into the core box for the steam passageways on a pair of loco cylinders. As always any input is greatly appreciated .

-jlakes85

[FLtenwheeler]

I think a corebox that is in sections will work.

Ti.

[jlakes85]

Thanks Ti,

I should I set up the plug vertically and do 3-4 sections vertically with repro plastic? I tried to set things up horizontally at first, making a clay parting line that split the thickness in half, but I couldn't convince myself that I would be free of undercuts

[Trainman4602]

Is This the passage ways between the valve bore and the main piston bore?

[jlakes85]

Hi Dave,

That's correct.

[Trainman4602]

I have made several of these patterns for various locomotives the latest was the USRA Mikado I am looking for pictures but I can tell you to split is down the middle

[jlakes85]

Hi Dave,

Sounds good. I've been looking at the plug and I think I'll be ok if I bed it down to the midway point and pour the repro that way. If there's any doubt, I guess I can always add a 3rd/multiple layer

[Trainman4602]

Can you supply a print of the cylinder ?

[jlakes85]

I'll send you a PM

[jlakes85]

Dave,

PM sent

[hoppercar]

coreboxes

[jlakes85]

Hoppercar,

Those look nice. I decided to go the route of making the positive plug and pouring the negative box to get away from all of the carving/fitting of a segmented corebox