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HTD crank and linkage: webs, link web, con-rods, clevis and Ø12 shafts for a 3 in cross crankcase

Name: HTD crank and linkage: webs, link web, con-rods, clevis and Ø12 shafts for a 3 in cross crankcase dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How is the crank of the 10 in HTD engine laid out? · Hardware · basis: Exact geometry; designed running gaps between every moving plane

Long Earth Society build part. Parts of the HTD 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: 8 in table

Notes

Built-up crank on Ø12 shafts in 6001 bearings: web A (displacer throw r 4) – Ø5 pin through the displacer con-rod's 625 – link web – Ø5 pin through the piston con-rod's 625 – web C (piston throw r 20). The displacer pin leads the piston pin by 90°.
Planes along the shaft (x): web A disc −9.5..−3.5, displacer con-rod −2.5..2.5, link web 3.5..9.5, piston con-rod 10.5..15.5, web C 16.5..22.5: 1.0 between every rod and web (designed). Pins are Ø5 × 16 dowels pressed in the webs.
Con-rods 60 (displacer, to the clevis on the rod) and 237 (piston, down through the reducer to the piston's cheeks); every eye runs on a 625. Sweep radius 31 (piston eye) inside the 3 in cross bore Ø72.9.

Sizes

part	role	size
crank-web-r8-b12	displacer web	r 4
crank-web-link-r8-r20	link web	r 4 / 20
crank-web-r20-b12	piston web	r 20
conrod-60-625	con-rod	60.0
conrod-237-625	con-rod	237.0
rod-clevis-6-pin5	rod clevis	Ø6 rod, Ø5 pin
shaft-12x76	shaft	76
shaft-12x210	shaft	210

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
web and hub bores	Ø12	Ø12 shafts (M4 grub on each hub)	slide	crank-web-*
pin bores	Ø5	dowel-5x16 crank pins	press	crank-web-*
con-rod pockets	Ø16 × 5	bearing-625 outer ring	press	conrod-*
clevis socket	Ø6 × 14	displacer rod, M4 grub	slide	rod-clevis-*
clevis slot and pin	6.0 wide, Ø5	5 thick con-rod; dowel-5x16	press	rod-clevis-*
plane gaps	1.0 between every web and con-rod plane	neighbouring webs and rods	designed	all
shafts	Ø12	bearing-6001 inner rings	press	shaft-*

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

crank-web-r8-b12	crank web, hub type: disc R12 × 6 with a Ø5 pin at r 4 (8 displacer stroke), hub Ø24 × 8, Ø12 bore in the hub only, M4 tapped radial hole	STEP · STL
crank-web-link-r8-r20	link web 6 thick: Ø5 displacer pin at r 4 and Ø5 piston pin at r 20, 90° apart	STEP · STL
crank-web-r20-b12	crank web, hub type: disc R28 × 6 with a Ø5 pin at r 20 (40 piston stroke), hub Ø24 × 8, Ø12 bore through, M4 tapped radial hole	STEP · STL
conrod-60-625	con-rod 60 centres, 5 thick, Ø16 pockets for 625 bearings, eyes Ø22	STEP · STL
conrod-237-625	con-rod 237 centres, 5 thick, Ø16 pockets for 625 bearings, eyes Ø22	STEP · STL
rod-clevis-6-pin5	rod clevis: 13 × 14 × 41 block, slot 6 wide for a 5 con-rod, Ø5 pin bore, Ø6 rod socket 14 deep, M4 tapped radial hole	STEP · STL
shaft-12x76	Ø12 × 76 crankshaft, −X (main): blind-cap 6001 to web A's hub	STEP · STL
shaft-12x210	Ø12 × 210 crankshaft, +X: web C, two 6001, the seal, gear and flywheel	STEP · STL