Metalurgia, forja y fundicion

Hello. I've acquired a Harvard (also called Stickney Jr.) model that was built from a casting kit from BP Machine. I think these kits were sold about 20 years ago, but are no longer available.

This model is mostly complete, but has some issues. For starters, the cylinder was not drilled/tapped for an oiler or for a spark plug (N.B., it is fitted with a mechanical ignitor for spark). Also, the timing gear on the eccentric shaft is not keyed, as called for in the plans. So I've decided...

Harvard/Stickney Jr Model

Last reply by legault on Thu, 14 Oct 2021 21:35:04 +0000

Organo Clay or Bentone for use in making K-Bond Sand.

Prices include USPS flat rate shipping in the US. The attached recipe calls for 6lbs of bentone per 100lbs of sand.
3lb - $18
6lb - $34
10lb - $45
15lb - $66

K-Bond is named for Kent State where it was developed by one of Tom Cobett's Students.
It is an almost smokeless oil bonded foundry sand for casting zinc, aluminum, brass, bronze and iron.

See this link for the recipe:...

Bentone for sale

Last reply by pellius on Thu, 14 Oct 2021 21:08:00 +0000

Maybe this has been put out there before, but I just discovered it for myself...
If only there was a basic (and super cheap) casting readily available to make nice flywheels with. This will work

Last reply by porkchopexpress on Thu, 14 Oct 2021 20:46:22 +0000

Greetings

Looking at getting myself one of these gizmos.

One problem is that this is a Linux house - - - - haven't run M$ stuff in years!

Second I was thinking of trying to get something a bit bigger than the 250 x 250 x 200 envelope.
Seems that the bigger models get really expensive in freight.

Hoping you guys have some ideas.
(Maybe better to start with a smaller model?, way to get in Canuckistan w/o breaking the bank!!! (Important!!!!!!!!) - - - anything else)

Anyone roll their...

Advice sought re: 3D printer purchase

Last reply by Eric Bergeron on Thu, 14 Oct 2021 20:34:11 +0000

Last reply by Eric Bergeron on Thu, 14 Oct 2021 20:31:43 +0000

Last reply by porkchopexpress on Thu, 14 Oct 2021 20:27:26 +0000

I'm a semi retired grumpy old guy that hasn't cast anything in well over a decade. I have a couple of projects (too many) that will require some aluminum castings and I'm too cheap to sublet the work. That means resurrecting my casting hobby and upgrading significantly the hardware and my knowledge base.

This desire lead to this forum. Been lurking for a while now and have learned a lot.
The pics below is of the few patterns left from those days and some of the castings from the...

In the middle of nowhere - Wyoming

My next engine build will be a derivative of Edgar Westbury's Wallaby, first designed for a model train, then updated for use in a model hydroplane. The engine is an overhead valve, water cooled, 30cc, inline twin cylinder 4-stroke. My version will use no castings.

I am a huge fan of Edgar Westbury's work as a model engine designer. He was very prolific producing designs optimized for construction by the home machinist with minimal tools, typically a small lathe and a drilling machine...

30cc Inline Twin 4-stroke Engine based on Westbury's Wallaby

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