Rob Roy loco

This topic has 2 replies, 2 voices, and was last updated 6 January 2015 at 22:33 by Steve F.

Viewing 3 posts - 1 through 3 (of 3 total)

Author

Posts
6 January 2015 at 21:44 #174996
Ian Horsfield 1
Participant
@ianhorsfield1
Many of you who have made Rob Roy will have encountered the problem I now have.-Can you help me?

I have made the steamchests 11/16 thick with the height for the valve spindle 7/16 as orig sht2 drg. The general assembly of the slide valve and cylinder shows this 7/16 dimension but it is drawn at 5/16!!!!. I have also made the slide valves 1/2 thick and upon assembly the bottom face of the slide valve is 1/8 away from the port face of the cylinder. Should I reduce the thickness of the steam chest by 1/8?

Looking at the book I now see that the slide valve nut has grown from 1/4 to 3/8 and the height of the valve spindle hole to .240. (Should this be .250?)

If I make new slide valve nuts that will give me the 1/8 I need. What do you think?

Any help would be appreciated before I make more swarf.

Thanks

-Ian
Advert

6 January 2015 at 21:44 #7430
Ian Horsfield 1
Participant
@ianhorsfield1
Help with drawing errors? – Steamchest and slide valve thicknesses
6 January 2015 at 22:33 #175001
Steve F
Participant
@stevef
Hi

I remembered seeing this here **LINK**

I hope this helps

regards

Steve
Author

Posts

Viewing 3 posts - 1 through 3 (of 3 total)

Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

Advert

Latest Replies

Viewing 25 topics - 1 through 25 (of 25 total)

- Topic
- Voices
- Posts
- Last Post
- Why righthand threads?
  Started by: vintagengineer in: General Questions
- 14
- 17
- 29 July 2026 at 01:43
  not done it yet
- Sealed Lead-Acid Battery
  Started by: Michael Gilligan in: Electronics in the Workshop
- 5
- 19
- 29 July 2026 at 00:14
  Michael Gilligan
- It’s A Compressor, Jim, But Not… 1 2
  Started by: Nigel Graham 2 in: General Questions
- 15
- 48
- 28 July 2026 at 23:26
  Nigel Graham 2
- blackgates eng 1 2
  Started by: Peter Daw in: Beginners questions
- 22
- 38
- 28 July 2026 at 22:39
  Stuart Smith 5
- Basic(?) Milling question
  Started by: paulmichael1084 in: Beginners questions
- 10
- 16
- 28 July 2026 at 21:15
  Julie Ann
- Hello from EastAnglia
  Started by: 1southdrive in: Introduce Yourself – New members start here!
- 3
- 3
- 28 July 2026 at 20:58
  noel shelley
- A new Milling Machine
  Started by: Martin Johnson 1 in: Workshop Tools and Tooling
- 6
- 7
- 28 July 2026 at 20:28
  Vic
- REXON SS16A scroll saw
  Started by: Michael Gilligan in: Workshop Tools and Tooling
- 4
- 9
- 28 July 2026 at 16:58
  Michael Gilligan
- Boiler explosion on Guadeloupe.
  Started by: howardb in: The Tea Room
- 6
- 10
- 28 July 2026 at 13:17
  JasonB
- Is anyone interested in developping a new series of model engines? 1 2 3 4
  Started by: paulmichael1084 in: General Questions
- 20
- 94
- 28 July 2026 at 10:31
  paulmichael1084
- Garden water pump
  Started by: John MC in: The Tea Room
- 12
- 22
- 28 July 2026 at 09:42
  noel shelley
- Latest new addon for FreeCAD!!
  Started by: Russell Eberhardt in: CAD – Technical drawing & design
- 2
- 5
- 28 July 2026 at 08:51
  Russell Eberhardt
- All things Beaver Mill 1 2 … 9 10
  Started by: Robert James 3 in: Manual machine tools
- 43
- 234
- 28 July 2026 at 07:51
  Lex Davis
- Silver Soldering
  Started by: Jss in: General Questions
- 11
- 18
- 27 July 2026 at 23:36
  duncan webster 1
- Bengs kits
  Started by: paul1956 in: Beginners questions
- 5
- 8
- 27 July 2026 at 17:37
  duncan webster 1
- New motor for a Myford super 7
  Started by: Hollowpoint in: Electronics in the Workshop
- 12
- 16
- 27 July 2026 at 17:29
  john fletcher 1
- chester conquest pcb board connections
  Started by: In Wilson in: Introduce Yourself – New members start here!
- 6
- 15
- 27 July 2026 at 13:35
  Hugh Stewart-Smith 1
- Peat-Shaped [ ref. Verdict DTI ]
  Started by: Michael Gilligan in: Workshop Tools and Tooling
- 1
- 1
- 27 July 2026 at 12:40
  Michael Gilligan
- Plug in Solar 1 2 3 4
  Started by: Vic in: The Tea Room
- 28
- 94
- 27 July 2026 at 09:27
  not done it yet
- Super Simplex Build
  Started by: Peter Hoerlein in: Work In Progress and completed items
- 7
- 19
- 27 July 2026 at 06:29
  Peter Hoerlein
- Hobbing a Brass or Aluminium Drive Pulley to Stop Belt Slippage
  Started by: Blue Heeler in: Hints And Tips for model engineers
- 7
- 15
- 27 July 2026 at 00:45
  Blue Heeler
- Long awaited FreeCAD version 1.1 released
  Started by: Russell Eberhardt in: CAD – Technical drawing & design
- 3
- 9
- 26 July 2026 at 15:36
  Russell Eberhardt
- Looking for detailed build logs to help decide next project
  Started by: GrahamS in: Stationary engines
- 4
- 8
- 26 July 2026 at 10:57
  GrahamS
- Deep drilling
  Started by: Speedy Builder5 in: Workshop Techniques
- 12
- 25
- 26 July 2026 at 07:58
  Dalboy
- Buzz Ballz packaging “unrecyclable” in U.K.
  Started by: Michael Gilligan in: The Tea Room
- 6
- 6
- 25 July 2026 at 23:16
  Bazyle

Rob Roy loco

Rob Roy loco

Latest Replies

Latest Issue

August 2026

Newsletter Sign-up

Latest Replies