Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Model & Toy Steam Engines – Stirling Cycle – Flame Lickers – Small Antique Originals => Topic started by: Tadfafty on July 12, 2020, 01:55:15 am

Title: Re: COVID-19 Project: Large engine for < $100
Post by: Tadfafty on October 04, 2020, 08:39:53 pm: I have an inch and a half stroke on the piston.
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Stoker on October 03, 2020, 06:53:05 pm: That will depend on how much throw your piston rod has, and how much of that throw you choose to use by the amount of the off-center placement of your crank pin. Once you've decided on those basic parameters, the triangulation of your inlet and outlet holes will be set on the arc prescribed by the spacing of the ports in your cylinder, based from your pivot hole.
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Tadfafty on October 03, 2020, 06:04:48 pm: How should I know where to drill holes through the plate I'm mounting it to for everything to be lined up properly?
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Scorpion2nz on July 23, 2020, 02:37:10 am: So it is a double acting oscillator .
Your only choice is to thread the hole With what ever taps
and dies you have and are comfortable with
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Jim on July 22, 2020, 09:37:25 pm: Love threads like this!
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Tadfafty on July 22, 2020, 08:12:23 pm: Here is the flat side.
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Scorpion2nz on July 21, 2020, 07:04:53 pm: Photo of flat side of cylinder please .
If the pivot hole is blank then thread it

Cheers
Dennis
Title: Re: COVID-19 Project: Large engine for < $100
Post by: txlabman on July 21, 2020, 06:03:49 pm: Quote from: Tadfafty on July 15, 2020, 04:40:25 pm
If anybody can think of a better way of mounting the cylinder, tell me.

Why not cut a groove in the shaft to guide it. You wouldn't have to make it very deep.
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Tadfafty on July 15, 2020, 04:40:25 pm: If anybody can think of a better way of mounting the cylinder, tell me.
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Tadfafty on July 12, 2020, 06:52:53 pm: mounting hole on the oscillating cylinder is quite odd. .34 inches diameter (17/50) no threads, pinhole in the center goes all the way through.
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Tadfafty on July 12, 2020, 12:55:19 pm: Status Update 1: Body and crank selected in the form stock steel and carriage bolt which were lying around.

[attachimg=1]

Now to cut the bolt shorter, modify a nut into a crank, tap the mounting hole on the cylinder (I can't figure out how it was originally mounted), and drill holes through the steel.
Title: Re: COVID-19 Project: Large engine for < $100
Post by: crazydoug on July 12, 2020, 06:50:05 am: Looking forward to see this project progress.
Crazydoug
Title: Re: COVID-19 Project: Large engine for < $100
Post by: classixs on July 12, 2020, 04:22:26 am: Agree with Dennis, this will be fun to follow...

GOGOGO !!! ;D
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Scorpion2nz on July 12, 2020, 02:41:21 am: This will be a interesting project to follow.

Cheers
Dennis
Title: Re: COVID-19 Project: Large engine for < $100
Post by: Tadfafty on July 12, 2020, 02:00:10 am: [attachimg=1]

[attachimg=2]

[attachimg=3]
Title: COVID-19 Project: Large engine for < $100
Post by: Tadfafty on July 12, 2020, 01:55:15 am: I was looking on eBay when I saw a piston & cylinder for a full sized oscillating engine. It was very small full sized engine but it would make for a very large model. I bought it and decided to try to see if I could build an engine for as cheap as possible. I've all ready selected a flywheel in the form of an old steam valve handle.