piston oil grooves

piston oil grooves

This topic has 4 replies, 4 voices, and was last updated 8 October 2016 at 12:22 by Ian S C.

Viewing 5 posts - 1 through 5 (of 5 total)

Author

Posts
7 October 2016 at 20:57 #259853
John gallo
Participant
@johngallo38006
Hi, I'm building the Stuart D10 and I have a question on the pistons. The plans call for 3 oil grooves equally spaced. They do not specify the shape or size of them. Rather than taking a guess on some thing I know little about, I was hoping some one may have done this before or can make an educated guess as to what these grooves should look like.

I also read that a single 1/8" groove packed with graphite yarn could be used. Might this be superior to the grooves? The piston is brass while the cylinder is cast iron, if that helps.

Thanks in advance, John.
Advert

7 October 2016 at 20:57 #8320
John gallo
Participant
@johngallo38006
8 October 2016 at 07:29 #259905
JasonB
Moderator
@jasonb
If you use a Vee tool and go in about 0.010" that should be fine on a small piston like that. A 60deg threading tool will work OK or you can grind up your own quiet easily.

A lot depends on what you want to do with the finished engine, if you are just going to runit on air or low steam pressure for display then the grooves will be more than adequate. If you intend it to do real work then a groove an packing will be better, an O ring is another option too.
8 October 2016 at 10:17 #259928
Neil Wyatt
Moderator
@neilwyatt
I used a silicone o-ring on my 10V.

Neil
8 October 2016 at 12:22 #259958
Ian S C
Participant
@iansc
For my hot air engines I use Labyrninth grooved pistons of similar dimentions to those suggested by Jason, mostly not quite the .010" depth as I try to get the piston skirt to about .040"/1 mm thick.

Ian S C
Author

Posts

Viewing 5 posts - 1 through 5 (of 5 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.

Code of Conduct

Latest Replies

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

- Topic
- Voices
- Posts
- Last Post
- theramino software for spectrometer … Advice please
  Started by: Michael Gilligan in: Clocks and Scientific Instruments
- 4
- 11
- 24 May 2025 at 14:30
  Michael Gilligan
- Drilling O1 for small parts
  Started by: Steve355 in: General Questions
- 9
- 13
- 24 May 2025 at 13:31
  Tony Pratt 1
- ‘STIFF’ Compound Slide
  Started by: kevian64 in: Beginners questions
- 12
- 13
- 24 May 2025 at 12:46
  Andy Stopford
- Aliphatic glue removal/separation
  Started by: Mike Joseph in: Model Boats
- 4
- 7
- 24 May 2025 at 12:31
  Colin Bishop
- Pinnacle milling machine
  Started by: acklam65 in: Help and Assistance! (Offered or Wanted)
- 10
- 10
- 24 May 2025 at 12:29
  Martin of Wick
- Quill Mounted DTI Holder?
  Started by: Bo’sun in: Workshop Tools and Tooling
- 5
- 7
- 24 May 2025 at 12:26
  Clive Foster
- Wyvern Engine
  Started by: Dave C in: Help and Assistance! (Offered or Wanted)
- 6
- 12
- 24 May 2025 at 10:49
  Dave C
- Boxford Cud or ML7 1 2
  Started by: Trevor Howley in: General Questions
- 18
- 32
- 24 May 2025 at 10:07
  Pete Rimmer
- Stuart Twin Victoria (Princess Royal) Mill Engine 1 2 … 51 52
  Started by: Dr_GMJN in: Work In Progress and completed items
- 34
- 1,281
- 24 May 2025 at 10:02
  JasonB
- Drunk driver broke my workshop! 1 2
  Started by: stew 1 in: The Tea Room
- 15
- 28
- 24 May 2025 at 09:43
  Pete Rimmer
- boiler mounting
  Started by: Garry Coles in: General Questions
- 2
- 2
- 24 May 2025 at 07:40
  Speedy Builder5
- Which to buy; Warco GH Universal vs Weiss VM32H Mill
  Started by: thisdesignedthat in: Manual machine tools
- 8
- 18
- 23 May 2025 at 21:36
  Clive Foster
- Model Turbines 1 2 … 24 25
  Started by: Turbine Guy in: Stationary engines
- 28
- 602
- 23 May 2025 at 21:33
  Michael Gilligan
- Is a tool & cutter grinder worth having? 1 2 3
  Started by: Brian H in: General Questions
- 40
- 62
- 23 May 2025 at 20:17
  bernard towers
- 2inch Fowler plans
  Started by: bob53page in: Traction engines
- 5
- 9
- 23 May 2025 at 18:05
  bob53page
- Kennet Tool and Cutter Grinder
  Started by: bankcottage15 in: Manual machine tools
- 3
- 5
- 23 May 2025 at 17:53
  bankcottage15
- Hints and tips
  Started by: larry phelan 1 in: Hints And Tips for model engineers
- 3
- 3
- 23 May 2025 at 17:47
  Bo’sun
- What Did You Do Today 2025 1 2 … 4 5
  Started by: JasonB in: The Tea Room
- 29
- 121
- 23 May 2025 at 17:35
  Diogenes
- Building Bernard Tekippe’s Precision Regulator 1 2 … 4 5
  Started by: Chris Raynerd 2 in: Clocks and Scientific Instruments
- 14
- 101
- 23 May 2025 at 17:34
  Chris Raynerd 2
- “What about the drains in Finchley?”
  Started by: Plasma in: The Tea Room
- 8
- 16
- 23 May 2025 at 15:07
  Plasma
- Contact Details for Matt Jeffrey
  Started by: Neil Wyatt in: General Questions
- 1
- 1
- 23 May 2025 at 10:50
  Neil Wyatt
- Amadeal VM25L Uneven Motor Brush Wear 1 2
  Started by: Richard Kirkman 1 in: Help and Assistance! (Offered or Wanted)
- 13
- 29
- 23 May 2025 at 09:11
  Richard Kirkman 1
- Not unexpected, but is it predictable ? 1 2
  Started by: Michael Gilligan in: 3D Printers and 3D Printing
- 10
- 38
- 23 May 2025 at 07:27
  Michael Gilligan
- Countersinking carbon fibre sheet with my Sieg CNC Mill
  Started by: Sarah F in: CNC machines, Home builds, Conversions, ELS, automation, software, etc tools
- 7
- 18
- 22 May 2025 at 19:06
  Sarah F
- Kennedy Hexacut machine hacksaw 1 2
  Started by: Leo F Byrne 1 in: Help and Assistance! (Offered or Wanted)
- 18
- 46
- 22 May 2025 at 17:56
  Waggonerman

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

View full reply list.

Latest Issue

June 2025

Buy Latest/Back Issues

Newsletter Sign-up

Latest Replies