Free 173 Best Homemade Tools eBook:  
Become a founding member: 500+ tool plans, full site access, and more.

User Tag List

Results 1 to 7 of 7

Thread: Double Acting Oscillating Engine

  1. #1
    Supporting Member editor@glue-it.com's Avatar
    Join Date
    Apr 2017
    Location
    UK
    Posts
    255
    Thanks
    32
    Thanked 399 Times in 115 Posts

    editor@glue-it.com's Tools

    Double Acting Oscillating Engine

    Thought you might all like this. A video of my double acting oscillating engine. I designed and made it some time ago, but thought it might be nice to talk people through how it works along with the basic dimensions etc. Specs are listed on my double acting engine page:



    I'm also trying to improve my presenting style for videos like this, don't know about everyone else, but it feels quite strange to me to talk to a camera.

    173 Best Homemade Tools eBook

  2. The Following 4 Users Say Thank You to editor@glue-it.com For This Useful Post:

    blkadder (Sep 25, 2021), enginepaul1 (May 23, 2021), mklotz (May 22, 2021), odd one (May 22, 2021)

  3. #2
    Supporting Member odd one's Avatar
    Join Date
    Apr 2020
    Location
    WNC
    Posts
    103
    Thanks
    131
    Thanked 39 Times in 25 Posts
    Very nice. Did you drill the ports after it was all assembled to ensure accuracy on alignment or were you good on your calculations.

  4. #3
    Supporting Member mklotz's Avatar
    Join Date
    Aug 2015
    Location
    LA, CA, USA
    Posts
    2,780
    Thanks
    289
    Thanked 5,271 Times in 1,753 Posts

    mklotz's Tools
    Very nicely done indeed. You might want to have a look at how Elmer Verburg built his double-acting wobbler; his includes a reversing mechanism...

    http://www.john-tom.com/ElmersEngine...rseWobbler.pdf

    I built his design and it runs very nicely - a compact design suitable for use in an RC boat.

    Double Acting Oscillating Engine-image00001.jpg

    I share your discomfort with talking to an inanimate object. Talking to oneself makes folks suspicious of your sanity. If you have a pet, try having it in the room when filming and talk to it. At least you'll know that something is hearing what you say even if it doesn't understand.
    ---
    Regards, Marv


    Home Shop Freeware
    http://www.myvirtualnetwork.com/mklotz

  5. The Following User Says Thank You to mklotz For This Useful Post:

    enginepaul1 (May 23, 2021)

  6. #4
    Supporting Member editor@glue-it.com's Avatar
    Join Date
    Apr 2017
    Location
    UK
    Posts
    255
    Thanks
    32
    Thanked 399 Times in 115 Posts

    editor@glue-it.com's Tools
    Quote Originally Posted by odd one View Post
    Very nice. Did you drill the ports after it was all assembled to ensure accuracy on alignment or were you good on your calculations.
    The calculations are quite easy as the ports are on the same radius for the cylinder and valve plate. Once I had those arcs I then constructed a line that goes through the crank pin (when it is at both extreme positions) and the centre of rotation of the cylinder on the valve plate. All of these points are quite easy to calculate.

    If you look carefully at the exhaust ports on the valve plate you can see that I enlarged them, effectively allowing them to open earlier - so I guess my calculations weren't spot on.....

  7. #5
    Supporting Member editor@glue-it.com's Avatar
    Join Date
    Apr 2017
    Location
    UK
    Posts
    255
    Thanks
    32
    Thanked 399 Times in 115 Posts

    editor@glue-it.com's Tools
    I finally got round to learning to use FreeCAD and making plans.

    Double Acting Oscillating Engine-cad-image-oscillating-engine.jpg

    The 3D modelling of parts was actually quite easy using FreeCAD 0.19

    There is quite a steep learning curve with this software and must admit that I found the Part > Body > Sketch logic difficult to get at first.

    But stick with it as it does click, I'm coming at it in middle age and it's taken me ~3days of solid work to get to a point where I can design parts.

    I have found the technical drawings quite tedious, it might just be my very low knowledge of CAD...

    Double Acting Oscillating Engine-oscillating-engine-plans.jpg

    I have though created plans for this simple oscillating engine, ok, they are not free, but they are low cost.

  8. #6
    Supporting Member editor@glue-it.com's Avatar
    Join Date
    Apr 2017
    Location
    UK
    Posts
    255
    Thanks
    32
    Thanked 399 Times in 115 Posts

    editor@glue-it.com's Tools
    The exploded assembly view of the engine, hopefully this gives you an idea of what an oscillating steam engine looks like as a bag of bits.

    Double Acting Oscillating Engine-oscillating-engine-assembly.jpg

    and as a simple line drawing

    Double Acting Oscillating Engine-oscillating-engine-assembly2.jpg

    hopefully you can spot the missing bolts, spring and grub screw

  9. #7
    Supporting Member editor@glue-it.com's Avatar
    Join Date
    Apr 2017
    Location
    UK
    Posts
    255
    Thanks
    32
    Thanked 399 Times in 115 Posts

    editor@glue-it.com's Tools
    Making this engine simpler has actually made it.




    173 Best Homemade Tools eBook

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •