Author Topic: Potty Lads and Dads Mill Engine  (Read 31820 times)

Offline Xldevil

  • Full Member
  • ****
  • Posts: 55
Re: Potty Lads and Dads Mill Engine
« Reply #105 on: February 27, 2017, 05:30:45 PM »
I know how such an engine works,
Actually it's not the first engine I build with a piston valve,
but in the drawings are only the two holes shown from the valve chest entering the cylinder.
For my understanding the in and out for the steam to the cylinder.
If the steam goes back to it,where can it enter the atmosphere?
« Last Edit: February 27, 2017, 06:04:42 PM by Xldevil »

Online Gas_mantle

  • Full Member
  • ****
  • Posts: 1262
  • North Yorks - UK.
    • My Youtube channel
Re: Potty Lads and Dads Mill Engine
« Reply #106 on: February 27, 2017, 05:39:22 PM »
Hi

I've built one of these engines - in the valve chest there should be 1 hole as the inlet, 2 holes into the cylinder and 2 holes leading from the spool bore to atmosphere as the exhaust.

Are you using Stewarts original plans as they are all shown on his drawings.

Peter.

Offline Jasonb

  • Full Member
  • *****
  • Posts: 6167
  • Surrey, UK
Re: Potty Lads and Dads Mill Engine
« Reply #107 on: February 27, 2017, 05:46:16 PM »
Plan has air entering on the side of the valve chest and exiting via two holes in the bottom, though I think Stew actually brought the steam into he top on his model, makes no difference.
« Last Edit: February 27, 2017, 05:54:48 PM by Jasonb »

Offline Xldevil

  • Full Member
  • ****
  • Posts: 55
Re: Potty Lads and Dads Mill Engine
« Reply #108 on: February 27, 2017, 06:06:13 PM »
Thank you very much.
Now I understand how to read this drawing.

Offline sbwhart

  • Full Member
  • ****
  • Posts: 696
  • Live Long and Prosper
Re: Potty Lads and Dads Mill Engine
« Reply #109 on: February 27, 2017, 08:15:32 PM »
Hello.
I'm trying to build this nice engine,but I can not find any exhaust port in the drawings that I have.
Maybe I'm blind,but any help would be appreciated.

Hi thanks for the interest in the engine
As Jason it's a piston valve engine with what they call centre admission meaning the steam/air enters the middle of the steam chest and exhausts through the ends via the two holes or if you leave the covers off at the end it will exit there.


Stew
A little bit of clearance never got in the way

Offline Xldevil

  • Full Member
  • ****
  • Posts: 55
Re: Potty Lads and Dads Mill Engine
« Reply #110 on: February 28, 2017, 01:29:10 AM »
Hello,Stew.
I simply overlooked the two exhaust holes. :facepalm2:
Actually I'm not very good in reading drawings.
Let me say thank you for sharing the plans.
I really like your kind of building reports as well.
Very informative and a pleasure to read.
I've learned and still learn much from you.
Being an autodidact in modell engineering
without people like you,I wouldn't be able to build any engine at all.

Offline gary.a.ayres

  • Full Member
  • ****
  • Posts: 300
  • British Isles & sometimes France
Re: Potty Lads and Dads Mill Engine
« Reply #111 on: September 25, 2018, 01:07:45 AM »
Very informative thread - very helpful to beginners like me. Thank you.

I plan to have a go at building this engine in due course.