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Oscillating twin-cylinder steam/air engine.

by denisc, published

Oscillating twin-cylinder steam/air engine. by denisc Dec 4, 2014
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9930Views 3129Downloads Found in Mechanical Toys

Summary

This is working toy/model of twin-cylinder oscillating/wobbler steam engine.
I have developed it just for fun.
It's designed in OpenSCAD and almost fully parametric.

The model almost fully plastic only two m3 x 10 allen screws required for connecting two parts of fly wheel.

http://youtu.be/P0lEBxBAync

Edit 6-dec-2014: Slic3r settings screenshorts added.

Instructions

I have printed all parts of the engine with 0.1mm line thickness.
Sliced by Slic3r.

Print:

  1. fly_wheel1
  2. fly_wheel2
  3. connecting_rod - 2
  4. cylinder - 2
  5. piston - 2
  6. plate - 2
  7. stand
  8. nipple nut - 2
  9. nut - 4

Clearances may be too small.

Sanding may be required for the following pairs:

  1. piston-cylinder
  2. connecting rod crank - fly whell crankshaft
  3. fly wheel axle - plate hole

Use two m3x10 allen screws to connect fly_wheel1 and fly_wheel2

Assembling: http://youtu.be/tcfEYyH4UNw

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Printed the pistons and cylinders. Unfortunately to tight, not fitting together.

Piston diameter lower then cylinder on 0.1 mm. Sanding.
Also, you can change `piston_clr' variable in engine.scad. It's radial clearance.

the nuts came out too small for me. I am going to try and scale them but I hope everything else comes out okay. Now I am finding that everything is out of scale.

The nuts diameter already have a clearance 0.34mm (piston_screw_clr * 2).
Probably you have an over extrusion.
If you interested in clearances values then look at source code (file engine.scad) - search variables with '_clr' suffix.

The spring part is impossible to slice in Simplify3D. Cuts the spring.

Just use Slic3r.

You have to minimize friction.
"It never seals compression when blowing" - it's true. The key is minimize friction.
I didn't use any grease.

I spent several hours sanding and applying graphite, it will not rotate when blowing as shown in your video. I will try with air compressor. It never seals compression when blowing in either side and rotating the crankshaft. Any advice?

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