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Valve Passage Core Box Plug

Posted: Mon Jul 08, 2019 11:54 am
by 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
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Re: Valve Passage Core Box Plug

Posted: Mon Jul 08, 2019 12:05 pm
by FLtenwheeler
I think a corebox that is in sections will work.

Ti.

Re: Valve Passage Core Box Plug

Posted: Mon Jul 08, 2019 12:12 pm
by 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

Re: Valve Passage Core Box Plug

Posted: Mon Jul 08, 2019 2:08 pm
by Trainman4602
Is This the passage ways between the valve bore and the main piston bore?

Re: Valve Passage Core Box Plug

Posted: Mon Jul 08, 2019 3:13 pm
by jlakes85
Hi Dave,

That's correct.

Re: Valve Passage Core Box Plug

Posted: Mon Jul 08, 2019 6:51 pm
by 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

Re: Valve Passage Core Box Plug

Posted: Tue Jul 09, 2019 6:20 am
by 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

Re: Valve Passage Core Box Plug

Posted: Tue Jul 09, 2019 6:45 am
by Trainman4602
Can you supply a print of the cylinder ?

Re: Valve Passage Core Box Plug

Posted: Tue Jul 09, 2019 7:21 am
by jlakes85
I'll send you a PM

Re: Valve Passage Core Box Plug

Posted: Tue Jul 09, 2019 7:27 am
by jlakes85
Dave,

PM sent

Re: Valve Passage Core Box Plug

Posted: Tue Jul 09, 2019 4:40 pm
by hoppercar
coreboxes

Re: Valve Passage Core Box Plug

Posted: Tue Jul 09, 2019 9:12 pm
by 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