Valve Passage Core Box Plug

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jlakes85
Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Valve Passage Core Box Plug

Post by jlakes85 » Mon Jul 08, 2019 11:54 am

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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FLtenwheeler
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Location: Florida, on the Lake Wales Ridge

Re: Valve Passage Core Box Plug

Post by FLtenwheeler » Mon Jul 08, 2019 12:05 pm

I think a corebox that is in sections will work.

Ti.
He who dies with the most unfinished projects: Should of put more time into their hobby.

jlakes85
Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Re: Valve Passage Core Box Plug

Post by jlakes85 » Mon Jul 08, 2019 12:12 pm

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

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Trainman4602
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Location: New Jersey

Re: Valve Passage Core Box Plug

Post by Trainman4602 » Mon Jul 08, 2019 2:08 pm

Is This the passage ways between the valve bore and the main piston bore?
ALLWAYS OPERATING MY TRAIN IN A SAFE MANNER USING AUTOMATIC AIR BRAKES

jlakes85
Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Re: Valve Passage Core Box Plug

Post by jlakes85 » Mon Jul 08, 2019 3:13 pm

Hi Dave,

That's correct.

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Trainman4602
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Location: New Jersey

Re: Valve Passage Core Box Plug

Post by Trainman4602 » Mon Jul 08, 2019 6:51 pm

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
ALLWAYS OPERATING MY TRAIN IN A SAFE MANNER USING AUTOMATIC AIR BRAKES

jlakes85
Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Re: Valve Passage Core Box Plug

Post by jlakes85 » Tue Jul 09, 2019 6:20 am

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

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Trainman4602
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Location: New Jersey

Re: Valve Passage Core Box Plug

Post by Trainman4602 » Tue Jul 09, 2019 6:45 am

Can you supply a print of the cylinder ?
ALLWAYS OPERATING MY TRAIN IN A SAFE MANNER USING AUTOMATIC AIR BRAKES

jlakes85
Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Re: Valve Passage Core Box Plug

Post by jlakes85 » Tue Jul 09, 2019 7:21 am

I'll send you a PM

jlakes85
Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Re: Valve Passage Core Box Plug

Post by jlakes85 » Tue Jul 09, 2019 7:27 am

Dave,

PM sent

hoppercar
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Re: Valve Passage Core Box Plug

Post by hoppercar » Tue Jul 09, 2019 4:40 pm

coreboxes
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jlakes85
Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Re: Valve Passage Core Box Plug

Post by jlakes85 » Tue Jul 09, 2019 9:12 pm

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

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