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Member postings for PatJ

Here is a list of all the postings PatJ has made in our forums. Click on a thread name to jump to the thread.

Thread: Green Twin Oscillator - 2019 Update
07/06/2020 20:07:49

That is also a great looking rocker-valve engine.

All your engines are fantastic looking.

I have my eye on a rocker-valve bottle engine.

Since the O-S Horizontal came along, I am considering sharing the components between a horizontal engine and a bottle engine, so I don't have to make two sets of designs/patterns for many things.

Bottle rocker photo attached.


Thread: Preston's Oscillator.
07/06/2020 19:58:34

Great work.

It looks fantastic, as do all your engines.

I have admired that engine for a long time.

Thread: Green Twin Oscillator - 2019 Update
07/06/2020 19:48:58

Hey Jason, that sounds cool. Which one did you model?

I am considering making a 60% O&S Horizontal, which would give it a 3" bore.

The footprint would be 20"x20".

Or I may downsize it a bit and make it a twin.

I will attach a photo of my go-by engine.

I picked this one up in the Pacific Northwest, so I would have something to measure.



Edited By PatJ on 07/06/2020 19:52:45

07/06/2020 07:48:16

Its finished.

Just sent it off to the publisher.

A rather long affair, but finally done, as are the drawings, photos and article.

First complete steam engine I have built, all from 3 photos.




Edited By PatJ on 07/06/2020 07:50:56

Edited By PatJ on 07/06/2020 07:55:13

29/04/2019 23:47:49

A rather lowly little display (downright laughable in some ways)  if there ever was one.

My intention was to get the engine painted before I showed it, but that did not happen.

I was on the fence about displaying it, but two guy attending the show encouraged me to set it out, and so I did.

The bright side is that this little engine has put me in a position from a knowledge and casting standpoint of making some hopefully really nice engines.

And this was my first complete engine build, so I feel like I can only go upwards from here.


The jumbo Cretors flywheel casting drew as much or more attention as the green twin oscillator.

Most that looked at the green twin (without reading the text) said to me "Casting kit ?".

I said "No, home cast".

It was painfully obvious that many could not begin to comprehend what "home cast" meant.

Very few seem to cast their own engine parts, especially in iron.


Edited By PatJ on 29/04/2019 23:49:52

Edited By PatJ on 29/04/2019 23:53:26

Edited By PatJ on 29/04/2019 23:54:07

29/04/2019 23:27:26

I took the green twin oscillator to the NAMES show Saturday (2019 show), and it was a truly humbling experience to say the least.

The guys who display at the national shows are rather good at what they do, and so my engine looked rather paltry compared to the many museum-grade engines at the show.

But for those who took the time to read the description of how the engine came about, they were impressed with the process.

And I am pleased to say that I am ahead of many/most as far as making my own iron castings, and I can definitely compete on the national scene with that, if not meet or exceed pretty much anything available commercially.


Edited By PatJ on 29/04/2019 23:29:44

Edited By PatJ on 29/04/2019 23:30:10

Thread: Why do both power hacksaws and bandsaws exist?
17/03/2019 22:59:40

Here is the saw I purchased.

It does turn off automatically.

The lever on the front has been sheared off so I will have to cast a new one in gray iron.

It seems to be rather a beast of a saw, but I often cut up large pieces of gray iron scrap to use for the foundry.









Edited By PatJ on 17/03/2019 23:00:12

Edited By PatJ on 17/03/2019 23:01:13

17/03/2019 22:52:00

I use a Portaband for cutting metal by hand, both straight and curved cuts, generally on thinner material that does not need to be clamped.

For cutting heavier pieces, I have an inexpensive generic horizontal bandsaw, but it does not cut straight, and it not very reliable.

I wanted a machine that would cut larger pieces unatttended, and something heavy duty enough that it would never stop working or need adjustment.

My solution was to buy a Marvel No.2 draw-cut hacksaw.

I am going to change the motor from 3-phase to 1-phase (I don't want to use a phase converter or VFD).

There is a video of someone online that has the exact model, and he rebuilds it, so that will be a great help with changing the motor. I am missing a few tensioning parts, but I can fabricate those.

The cost was $400, and about 2/3 more for shipping, but I think it will work out well, and it does not seem to have much wear and tear on it.

I will post some photos in a minute.

I don't know this individual, but he does a good job on rebuilding his Marvel.

He is what we call in these parts a "Good ole boy", but he has talent.

The part of the video at 4:37 makes one want to yell "Just Say No to Crack !!".

Edited By PatJ on 17/03/2019 22:57:25

Thread: Green Twin Oscillator - 2019 Update
12/03/2019 21:42:26

Thanks Lee, I appreciate that thought.

Thread: Beware new engine project!
11/03/2019 01:34:04

It is possible to build a home foundry and cast your own engine parts in gray iron.

Maybe not a simple affair, but certainly a possibility.

And you can cast the parts to suit your preferred size.

A few years ago, I considered it impossible, but now I know better.

Edited By PatJ on 11/03/2019 01:34:31

Edited By PatJ on 11/03/2019 01:34:57

Edited By PatJ on 11/03/2019 01:35:09

Thread: Jumbo Ball Hopper Monitor
10/03/2019 20:59:40

Thanks, looks like I have a bit of work to do before trying a casting.

10/03/2019 19:32:04

In my haste to find new things to try out on the printer, I neglected to include the hub clamping bosses and spoke bosses, and so I will have to add those to the plastic patterns before I make the aluminum permanent pattern.

For the balancing grooves, at this point I could gouge them out of the plastic, or cut them in the permanent aluminum pattern.

I may make a rough cut for the grooves in the plastic that is undersized, and clean it up in the aluminum pattern.

Thanks for pointing that stuff out.

Small but important details for sure.

10/03/2019 18:22:09

Here is the logo that I carved out of a block of linoleum.

It is flexible, so I will adhere it to the gas tank before I make a casting.


10/03/2019 18:17:40

I think that first screencap I posted was an early 3D model for the flywheel.

This one seems to be my latest version, and I think is the one I used to print with.


10/03/2019 18:15:00

I have the VJ on my list, and I think the flywheel is close enough that I could use it on a VJ or a Ball Hopper, but this flywheel print will be used for the Ball Hopper Monitor.

I will attach a photo which I think is one of your builds.

Also attached are the beginnings of some of the other 3D models for this engine.






Edited By PatJ on 10/03/2019 18:15:23

10/03/2019 17:26:17

I am also printing some patterns for a jumbo ball hopper monitor IC engine.

The pattern is about 13" diameter, and after double shrinkage and machining it should finish out at about 12" diameter.

I will cast permanent pattern halves in 356 aluminum.

The 3D model was created in Solidworks.

The spokes are not true ellipsoidal, because lofting those is problematic, but I will sand the spokes on the pattern to an ellipsoidal shape before casting the flywheel in gray iron.




Thread: Green Twin Oscillator - 2019 Update
10/03/2019 17:16:37

I found a few photos in an album here.






Thread: Jumbo Dake
10/03/2019 17:08:58

This is my furnace in action.

The crucible lift is at 1:00.

Edited By PatJ on 10/03/2019 17:10:35

10/03/2019 17:05:59

Here are a few photos of the printed patterns so far.

The surfaces inline with the pattern pull have a minimum of 5 degrees draft.

Bearings will be poured babbitt.







Edited By PatJ on 10/03/2019 17:11:20

10/03/2019 17:00:07

I bought a Prusa MK3 printer the other day, and decided to print out the patterns for a jumbo-sized Dake engine as a trial run.

So far I am quite impressed with the little printer, and it has basically been running 24/7 for over a week without any problems.

This will be on the large size for a model engine, but I like to straddle the line (or cross it) between models and small workshop engines.

My eyesight is not good these days, so this is basically an engine version of a large print book for the visually impaired.

The engine will be poured in gray iron using my backyard oil-fired furnace.

I will probably pour permanent patterns in 356 aluminum first, since the plastic tends to get brittle over time, and some of the printed patterns are pieced together from multiple printed pieces.


Edited By PatJ on 10/03/2019 17:07:01

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