Search found 37 matches

by PatJ
Wed Nov 17, 2021 8:23 pm
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

Here are the helical gears I will cast for the 3" bore Frisco Standard.

The are the same diameter, but give a 2:1 ratio, which is a bit of a trick.
rImg_9020.jpg
rImg_9020.jpg (72.49 KiB) Viewed 2089 times
rImg_9015.jpg
rImg_9015.jpg (107.36 KiB) Viewed 2089 times
by PatJ
Wed Nov 17, 2021 8:21 pm
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

I would really like to cast a Frisco Standard single, with a 3" bore, and am approaching completion of that design.

I plan on casting the helical gears for the valve train.
Image253.jpg
Image251.jpg
Image102.jpg
Image102.jpg (49.77 KiB) Viewed 2092 times
by PatJ
Wed Nov 17, 2021 8:18 pm
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

My largest attempted iron pour was about 60 lbs of iron. My largest successful iron pour was about 30 lbs of iron. These days, I think I could relatively easily pour 90 lbs of iron using a lifting crane and a pouring cart, both of which I built. The green twin started as a whim to learn 3D modeling,...
by PatJ
Wed Nov 17, 2021 8:13 pm
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

The 2D drawings for the green twin are included in the Live Steam article, but some of them are not to scale. I have to-scale 11x17 drawings for the green twin, and when the Live Steam series is complete, I will probably post those for free online in pdf format (I do everything open sourced). I made...
by PatJ
Wed Nov 17, 2021 8:04 pm
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

Thanks. Yes, I have a thread about it online, but I am waiting until the last article is published before opening it up. The next Part in Live Steam will be Part 5, and that may be the last part, or perhaps one more. I furnished all the Green Twin information to Live Steam free of charge, so I don't...
by PatJ
Wed Nov 17, 2021 9:41 am
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

Here is the 3D model that I made.

Many of the patterns were 3D printed from the 3D model, including the flywheel.
.
.
.
Final-Assembly-Rev2-01.jpg
Final-Assembly-Rev2-01.jpg (121.94 KiB) Viewed 5809 times
by PatJ
Wed Nov 17, 2021 9:38 am
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

Thanks. Bore is 1.25", stroke is 2.0". Here is a photo of the original engine that was on the Preston's Services site in the UK. My engine is 60% of the original. I got it as close as I could get it, but only had three photos, and I think they were all from skewed angles, so tricky to get it exact. ...
by PatJ
Wed Nov 17, 2021 8:44 am
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

Pouring some gray iron.
It takes a lot of leather to pour iron, since the radian heat is significant.
.
.
00041.jpg
00041.jpg (88.9 KiB) Viewed 5822 times
by PatJ
Wed Nov 17, 2021 8:41 am
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Re: Green Twin Complete

Somehow, the attachement gets shown twice.
Not sure how to fix that.

.
by PatJ
Wed Nov 17, 2021 8:35 am
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 7922

Green Twin Complete

I worked on this engine since 2012, and was beginning to think I would never complete it. I cast the flywheel in gray iron, and the remaining cast parts in 356 aluminum. COVID hit and worked slowed down just long enough for me to finish it all. I made full 2D drawings, and published the entire thing...