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A pattern for an MG manifold #1: A wood master pattern and the production tool that will make the casting

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Blog entry by Patternguy posted 04-01-2017 02:25 PM 2468 reads 0 times favorited 7 comments Add to Favorites Watch
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Old motor-heads out there might get a kick out of these images. They show a master pattern under construction, and the fascinating thing is that it is being made out of WOOD!!! Yea..old school stuff. (actually it’s only 14 years ago:(

The pattern is for a 4 cylinder MG manifold.

Unfortunately, no hand carved mahogany core box to go with it though, the box was CNC cut out of aluminum.

This picture below shows the match plate that was made with the master pattern.

It’s the detailed cast aluminum plate to the left side of the picture.

Match plates are production tools used in the foundry to mold the castings.
Most match plates are CNC machined today, but this was cast from plaster molds, cleaned, and polished.
It’s a 2-impression plate, meaning 2 castings will be made in each mold.

Yep…That’s me, crouched next to that shiny thing.

It’s an exact replica of the original ark from the Indiana Jones movie, “Ark of the Covenant”. There is quite a story behind THAT project.



7 comments so far

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Redoak49

3004 posts in 1860 days


#1 posted 04-01-2017 04:15 PM

Always interesting blogs…

View bruce317's profile

bruce317

402 posts in 695 days


#2 posted 04-01-2017 04:18 PM

Love it! I retired from a foundry.

-- Bruce - Indiana - Sawdust is just, MAN GLITTER!

View Patternguy's profile

Patternguy

53 posts in 563 days


#3 posted 04-01-2017 05:35 PM

Bruce,
Yes!...another foundryman.
I love your projects…especially that bulldozer.

Redoak,
I suspected that you know your way around a foundry too. (So I scoped you out)
Ha…any guy that spent his life deciphering the micro structure of metals HAS to know something about the workings of a foundry.

View Patternguy's profile

Patternguy

53 posts in 563 days


#4 posted 04-01-2017 06:54 PM

Here is a closer look at the match plate.

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Patternguy

53 posts in 563 days


#5 posted 04-02-2017 01:55 PM

Here is the core.

View bruce317's profile

bruce317

402 posts in 695 days


#6 posted 04-02-2017 06:03 PM

Guessing your using Cope & Drag boxes. Also a Slinger to pack sand in boxes. How big is your production run?

-- Bruce - Indiana - Sawdust is just, MAN GLITTER!

View Patternguy's profile

Patternguy

53 posts in 563 days


#7 posted 04-08-2017 02:10 PM

Nope…green sand. The job ran on a 20×24 hunter. The foundry probably ran maybe…100-200 molds total?
I’d be curious myself because this was good production tooling ($$), and most restoration jobs I’ve worked on relied on less expensive equipment.
Of course, unit cost is affected by the production method and castings made on a hunter will always be competitive.
Considering what was invested to get “one” casting, I think somebody was hoping to make some money on a lot of castings.

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