Search found 206 matches

by jlakes85
Mon Sep 16, 2019 10:25 am
Forum: Casting & Foundry Work
Topic: Calculating Shrink On Cylindrical Pattern Part CI
Replies: 4
Views: 964

Calculating Shrink On Cylindrical Pattern Part CI

Hi All, Im getting ready to start making the cylinder pattern for my 5" scale project. If I have a 6" diameter cylinder bobbin dimension to hit on the finished casting, would i jist simply turn the wooden pattern to fit an outside caliper set to 6" off of a shrink rule, or would i need to use a doub...
by jlakes85
Tue Jul 30, 2019 7:49 am
Forum: Casting & Foundry Work
Topic: Working with small wood pieces/patternmaking
Replies: 7
Views: 932

Re: Working with small wood pieces/patternmaking

Hi John,

Absolutely. I think what you mentioned about temporary glue-on handles is what I was after. I was just looking through a Micro-Mark catalog for ideas as well. They have some pretty small hand held texturing devices. Not sure if anyone can recommend one over the other.
by jlakes85
Tue Jul 30, 2019 4:41 am
Forum: Casting & Foundry Work
Topic: Working with small wood pieces/patternmaking
Replies: 7
Views: 932

Re: Working with small wood pieces/patternmaking

Hi Mihit,

This would be for a slide valve steam cylinder. It's just a small rectangular strip of wood, but I want it to be accurate and I'm scratching my head as to how to hold/secure these small pieces for the final finishing/sizing operations
by jlakes85
Mon Jul 29, 2019 8:39 pm
Forum: Casting & Foundry Work
Topic: Working with small wood pieces/patternmaking
Replies: 7
Views: 932

Working with small wood pieces/patternmaking

Hi all,

Are there any clamps/tools that make this easier when trying to get these small pieces to close dimensions? Think small like valve port core prints, individual gating pieces e.t.c.

-jlakes85
by jlakes85
Tue Jul 09, 2019 9:12 pm
Forum: Live Steam
Topic: Valve Passage Core Box Plug
Replies: 11
Views: 1519

Re: Valve Passage Core Box Plug

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
by jlakes85
Tue Jul 09, 2019 7:27 am
Forum: Live Steam
Topic: Valve Passage Core Box Plug
Replies: 11
Views: 1519

Re: Valve Passage Core Box Plug

Dave,

PM sent
by jlakes85
Tue Jul 09, 2019 7:21 am
Forum: Live Steam
Topic: Valve Passage Core Box Plug
Replies: 11
Views: 1519

Re: Valve Passage Core Box Plug

I'll send you a PM
by jlakes85
Tue Jul 09, 2019 6:20 am
Forum: Live Steam
Topic: Valve Passage Core Box Plug
Replies: 11
Views: 1519

Re: Valve Passage Core Box Plug

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
by jlakes85
Mon Jul 08, 2019 3:13 pm
Forum: Live Steam
Topic: Valve Passage Core Box Plug
Replies: 11
Views: 1519

Re: Valve Passage Core Box Plug

Hi Dave,

That's correct.
by jlakes85
Mon Jul 08, 2019 12:12 pm
Forum: Live Steam
Topic: Valve Passage Core Box Plug
Replies: 11
Views: 1519

Re: Valve Passage Core Box Plug

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
by jlakes85
Mon Jul 08, 2019 11:54 am
Forum: Live Steam
Topic: Valve Passage Core Box Plug
Replies: 11
Views: 1519

Valve Passage Core Box Plug

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 20190708_124647.jpg 20190708_124707.jpg 20190708_124731.jpg 2...
by jlakes85
Fri Jul 05, 2019 11:20 am
Forum: Live Steam
Topic: Purpose of False Valve Seats
Replies: 8
Views: 1499

Re: Purpose of False Valve Seats

Hi rudd,

The cylinder is cast iron..I'm assuming the designer meant to make the seat out of 303 or 304 SS. The valve is cast bronze