Category: Other projects
Stirling engine "Große Laura"
The model
The kit for the Stirling engine "Große Laura" from the field of functional modelling comes from the company "Bengs Modellbau". The manufacture of the individual parts requires precision, as tolerances of 0.02 mm must be adhered to in some cases in order to obtain a functional engine.
Material / tools used
- SIEG C2 lathe
- Proxxon fine milling machine
- Gas torch for brazing
- Tap (M2; M3; M4; M8 x 0.75; M10 x 1)
- Cutting die (M3; M8 x 0.75; M10 x 1)
- Reamer (3H7, 4H7, 5H7, 8H7, 10H7)
- Various files, turning chisels and drills
- Pull-down vices
- HSS milling cutter
- Measuring instruments
- Four-jaw chuck
- HSS core drills
- Travelling centre point
- Drill chuck
- Quick-change steel holder according to the "Multifix" system, size Aa
Procedure
Step 1
Making the hole
In the first step, the lathe was converted into a drilling machine in order to produce an 80 mm deep hole.
Step 2
Making the cooling cylinder
The cooling cylinder for the displacer side was then produced.
Step 3
Making the cooling fins
The cooling fins were turned in using a 2 mm wide and deep grooving tool.
Step 4
Grind the working piston to size
The working piston was then wet-ground to exact dimensions.
Step 5
Working piston in the cylinder
The picture shows the working piston with 0.02 mm clearance in the steel cylinder. The cylinder was previously made to measure on the lathe.
Step 6
Milling the piston eye
In the next step, the piston boss including the mount for the piston pin was milled from a square brass rod.
Step 7
Make the bearing sleeve for the displacement piston
The bearing sleeve was made from aluminium. Two brass plain bearings for the displacement piston rod were then pressed into the bearing sleeve.
Step 8
Making the air control valve for speed control
The air control valve for the speed control was then manufactured in one piece from a brass rod.
Step 9
Pre-assembly of the model
Step 10
Finalising the Stirling engine
Tip
Articles used paulimot
