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Ground rods, hollow piston rod and crank shafts for the performance engines (Ø6, Ø8, Ø10 / 7)

Name: Ground rods, hollow piston rod and crank shafts for the performance engines (Ø6, Ø8, Ø10 / 7) dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What rods and shafts does a tri-clamp crosshead Stirling engine need? · Hardware · basis: Design values; lengths from the engines' layouts

Long Earth Society build part. Rods and shafts of my performance engines. The engines

Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features

sizes: 9 in table

Notes

Ground rods cut to length with threaded ends (threads drawn at the major diameter): the displacer rods (Ø6, M6), the gamma's piston rod (Ø8, M8), the beta's hollow piston rod (Ø10 / Ø7, M10 × 1; the displacer rod runs inside it) and the Ø8 crank shafts the built-up cranks are pressed onto.

Sizes

part	size
rod-6x423.2-m6	Ø6 × 423.20
rod-8x304.85-m8	Ø8 × 304.85
rod-6x300.25-m6	Ø6 × 300.25
tube-10x7x158.6-m10x1	Ø10/7 × 158.60
shaft-8x56.5	Ø8 × 56.50
shaft-8x88	Ø8 × 88.00
shaft-8x46.3	Ø8 × 46.30
shaft-8x103.95	Ø8 × 103.95
shaft-8x138.3	Ø8 × 138.30

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.

feature	exact	mates with	fit	files
displacer rods	Ø6, M6 × 12 ends	gland bushings (run), cap and yoke M6 holes	run	rod-6x*
piston rod	Ø8, M8 × 12 ends	gland bushings 8 × 12 × 20 (run)	run	rod-8x*
hollow rod	Ø10 / Ø7, M10 × 1 × 16 ends	guide bushings 10 × 14 × 15 (run); Ø6 displacer rod inside (no contact)	run	tube-10x7*
crank shafts	Ø8	crank webs (press), 608 bores, collars, flywheel, pulley	press	shaft-8x*
transfer tube	Ø12.7 × 0.89	1/2 in tube compression fittings	designed	transfer-tube*

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Long Earth Society

Engine builds

web, video

LES site

Free files

★ Free files 13 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

rod-6x423.2-m6	Ø6 × 423.20 ground rod: horizontal gamma displacer rod, M6 × 12 both ends (drawn at Ø6)	STEP · STL
rod-8x304.85-m8	Ø8 × 304.85 ground rod: horizontal gamma piston rod, M8 × 12 both ends	STEP · STL
rod-6x300.25-m6	Ø6 × 300.25 ground rod: charged beta displacer rod, M6 × 12 both ends	STEP · STL
rod-6x315.4-m6	Ø6 × 315.40 ground rod: walking-beam gamma displacer rod, M6 × 12 both ends	STEP · STL
transfer-tube-12.7x0.89x64	transfer tube Ø12.7 × 0.89 wall × 64 (1/2 in tube) between the two 1/2 NPT fittings	STEP · STL
tube-10x7x158.6-m10x1	hollow piston rod Ø10 / Ø7 × 158.60, M10 × 1 × 16 both ends (drawn at Ø10)	STEP · STL
shaft-8x56.5	Ø8 × 56.50 crank shaft (pressed into the webs)	STEP · STL
shaft-8x88	Ø8 × 88.00 crank shaft (pressed into the webs)	STEP · STL
shaft-8x46.3	Ø8 × 46.30 crank shaft (pressed into the webs)	STEP · STL
shaft-8x103.95	Ø8 × 103.95 crank shaft (pressed into the webs)	STEP · STL
shaft-8x138.3	Ø8 × 138.30 crank shaft (pressed into the webs)	STEP · STL
shaft-8x95.8	Ø8 × 95.80 crank shaft (pressed into the webs)	STEP · STL
shaft-8x91	Ø8 × 91.00 crank shaft (twin: both webs pressed on it)	STEP · STL