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Mug LTD crank pedestal (one bearing block, two 623s)

What holds the crankshaft above a small LTD Stirling engine? · Hardware · basis: My geometry: crank axis 169 above the top plate, set by the 5 mL glass syringe (105 long) plus clevis and 45 mm con-rod; both cranks overhung, one each side of the block

Long Earth Society build part. Crank support of the mug LTD. 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
3 in table

Notes

  • Both cranks are overhung: the flywheel crank on the displacer side and a crank disc on the syringe side, with a Ø3 × 30 shaft in two 623s in one 10 mm bearing block between them. No con-rod crosses the shaft, so nothing in the mechanism meets it at top dead centre.
  • The post stands beside the syringe (y −27..−13) so the plunger clevis and barrel collar pass it; the foot's two arms reach round the syringe socket boss to two M3 × 8 at (35.5, ±20.5), through the top plate into tapped holes in the ring.
  • The crank height comes from the glass syringe: its 105 mm barrel stands in the top plate, the plunger clevis pin is 12 above the plunger collar, and the con-rod is 45.

Sizes

featurevalue_mm
crank axis above top plate169.0
bearing blockx 15.5..25.5
bearings2 × 623

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.

featureexactmates withfitfiles
bearing pocketsØ10 × 4, one in each face of the block623 bearing OD 10pressall
shaft clearanceØ5Ø3 shaft (no contact)designedall
foot holesØ3.4M3 clearancedesignedall

Where the files are

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

Long Earth SocietyEngine buildsweb, videoLES site

Free files

★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

mug-ltd-crank-pedestalcrank pedestal: foot with two arms round the syringe boss (to x 38.5) with 2 × Ø3.4, post 10 × 14 beside the syringe, bearing block 10 thick at x 15.5..25.5 with a 623 pocket (Ø10 × 4) in each face and Ø5 between, axis 169 above the top plateSTEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=mug-ltd-crank-pedestal

Mug LTD crank pedestal (one bearing block, two 623s), isometric render of a generated part
Render of mug-ltd-crank-pedestal from the free STEP; not to scale.

How it fits

In these build lists

Mug LTD (sits on a coffee mug)

You might also need

Build list: Mug LTD (sits on a coffee mug)23 lineslist
LTD Stirling bottom plate, Ø120 and Ø170, isometric render of a generated part
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LTD Stirling top plate with syringe socket, Ø120 and Ø170, isometric render of a generated part
LTD Stirling top plate with syringe socket, Ø120 and Ø1702 sizes★ 2 files
Glass syringes 1–50 mL (all-glass, ground-glass plunger): barrel and plunger, isometric render of a generated part
Glass syringes 1–50 mL (all-glass, ground-glass plunger): barrel and plunger8 sizes★ 14 files

Questions

Why is the mug LTD so tall?

The glass syringe is 105 mm long and stands upright in the top plate; the crank sits a con-rod length above its plunger.