Root's Engine - Model Steam Engine

thingiverse

Human: based on drawings for a working demonstration of a Root's steam engine I'm drawing directly from designs meant to show how this model operates, even if the crank doesn't quite meet expectations different production methods will allow us to recreate it with minor adjustments. models are created with precision drilling, though they remain untapped The OpenSCAD source is available for those interested sizes indicated on the drawings specify: Cover to Valve cover setscrews tap #4-40x 0.19" deep x 8 Exhaust ports, tap .25-28 NF x 0.25" deep x 2 Pressure port, tap .25-28 NF x 0.25" deep x 1 Valve Cover to Body set bolts, tap #6-32 x 0.31" x 12 Valve to Valve Shaft grub screw, #4-40 x 1 the only missing component in these STL files is the spacer a thin piece OD 0.5" ID 0.32" thick to suit yet assembled to verify the precise dimensions and thickness necessary for completion. 20141207 added the spacer, a crucial part providing thrust support between the valve cover and valve it may need some tweaking to match your model. valve lockring replaces the impractical set screw hole on the valve to secure the valve shaft the valve locking system uses m3 nut traps and an m3 setscrew to fix the valve shaft at the ideal angle for proper timing Instructions drawings taken directly from Steam & Stirling Engines You Can Build Book 2 a collection of engines featured in Live Steam between 1982 and 1993.