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Can-engine cap for 53.3, 58, 66 and 76.2 mm cans

What are the dimensions of the cap for a soda-can Stirling engine? · Standard part · basis: Bore drawn at the can body OD of the can entries (Ø66 12 oz, Ø58 sleek, Ø53.3 slim, Ø76.2 steel 300); rod bore at the 2 mm rod, hose barb at the barb-4mm profile

Long Earth Society build part. The printed parts for the LES can engine, sized to the cans, syringes, CDs and bearings in the library. 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
4 in table

Notes

  • The cap closes the open end of the can and is the cold end of the can engine's displacer cylinder. Its bore is the can body OD exactly (Ø66, Ø58, Ø53.3 or Ø76.2), 11 mm deep, under a 3 mm top wall; the outside is the can OD + 4.8 (Ø70.8 for the 66 mm can).
  • On centre a Ø16 boss carries a Ø2 bore straight through for the 2 mm displacer rod (fit: run). The bore is the rod guide and the seal; nothing is pressed into it.
  • The transfer port is an integral Ø4 hose barb, the same profile as barb-4mm on the silicone tube page, set 0.3 × the can diameter off centre (19.8 mm on the 66 mm cap); the 4 × 6 transfer tube goes from it to the power cylinder.
  • Three Ø2.5 holes (M3 tap size) at 120°, 6 mm above the open face, take grub screws that grip the can wall. Every mating size is in the Mating features table.

Sizes

filecanboreoutside Øheight
can-cap-6612 oz standard66.070.817
can-cap-58sleek58.062.817
can-cap-53.3slim53.358.117
can-cap-76.2steel 300 food can76.281.017

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
can-cap boreØ66 / Ø58 / Ø53.3 / Ø76.2can body OD (three M3 grubs grip it)slidecan-cap-*
grub holesØ2.5M3 tap drilldesignedcan-cap-*
rod-guide boreØ2 × 62 mm wire displacer rodruncan-cap-*
transfer-port barbØ4 shank, 3 ridges to Ø5.2, Ø2.5 bore, 14 proud4 mm ID tubedesignedcan-cap-*

Where the files are

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

WikipediaStirling enginewebCC BY-SA 4.0 (text)
Long Earth SocietyCan engine buildvideo, webLES site
Long Earth SocietyEngine builds (videos and write-ups)web, videoLES site

Free files

★ Free files 4 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

can-cap-66cap for a Ø66 can: bore Ø66 (the can body OD, exact), Ø2 rod-guide bore for the 2 mm wire rod, integral transfer-port barb for 4 mm ID tube (Ø4 shank, three ridges to Ø5.2, Ø2.5 bore, 14 proud), 3 × M3 tapped (Ø2.5) grub holesSTEP · STL
can-cap-58cap for a Ø58 can: bore Ø58 (the can body OD, exact), Ø2 rod-guide bore for the 2 mm wire rod, integral transfer-port barb for 4 mm ID tube (Ø4 shank, three ridges to Ø5.2, Ø2.5 bore, 14 proud), 3 × M3 tapped (Ø2.5) grub holesSTEP · STL
can-cap-53.3cap for a Ø53.3 can: bore Ø53.3 (the can body OD, exact), Ø2 rod-guide bore for the 2 mm wire rod, integral transfer-port barb for 4 mm ID tube (Ø4 shank, three ridges to Ø5.2, Ø2.5 bore, 14 proud), 3 × M3 tapped (Ø2.5) grub holesSTEP · STL
can-cap-76.2cap for a Ø76.2 can: bore Ø76.2 (the can body OD, exact), Ø2 rod-guide bore for the 2 mm wire rod, integral transfer-port barb for 4 mm ID tube (Ø4 shank, three ridges to Ø5.2, Ø2.5 bore, 14 proud), 3 × M3 tapped (Ø2.5) grub holesSTEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=can-engine-cap

Can-engine cap for 53.3, 58, 66 and 76.2 mm cans, isometric render of a generated part
Render of can-cap-66 from the free STEP; not to scale.

How it fits

Parts that fit it

CD / DVD disc Ø120 × 1.2 mm with Ø15 holeØ15 hole on the hub's Ø15.0 spigotHard-drive plattersØ25 hole on the hub's Ø25.0 spigotBamboo skewer Ø3 × 300 mmthe can engine's crankshaftCoat-hanger wire Ø2.0 mm and paper-clip wire Ø1.0 mm2 mm wire rod through the Ø2 bore in the can cap (run)BBsBBs as guides along the displacer rodPing-pong ball Ø40 mm, 0.4 mm walllightweight displacer in a small demonstratorHose barbs for 2, 3, 4, 6 and 8 mm ID tubethe cap's integral Ø4 barb uses this profileDisplacer rods Ø2 × 60, 78, 100 and 180, Ø3 ×…Ø2 rod in the cap's Ø2 bore

Goes in or on

Aluminium beverage cansØ66 bore over the 12 oz can bodySteel food cansØ76.2 bore over the steel 300 can

Connects to

Can-engine displacer Ø54 × 25, Ø62 × 30, Ø72 × 35the displacer's 2 mm rod runs in the cap's Ø2 boreSilicone tube 1 × 3 to 10 × 14 mm4 × 6 tube on the integral Ø4 barbSyringe cradle for 10, 20 and 60 mL barrelstransfer tube from the cap's barb to the syringe tip

Also needed

Craft sticks 114 × 10 × 2 mm and jumbo 150 × 18 ×…2 mm wire displacer rod

In these build lists

Soda-can gammaA 12 oz can as the displacer cylinder over a tea light, a 10 mL syringe barrel a…

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Crank stand for a 623 bearing, 40 / 60 / 80 mm, isometric render of a generated part
Crank stand for a 623 bearing, 40 / 60 / 80 mm3 sizes★ 3 files
Build list: Soda-can gamma25 lineslist

Questions

What size cap fits a 12 oz soda can?

Can-cap-66: Ø66.0 bore (the can body OD), 11 mm deep, Ø70.8 outside, 17 mm tall overall.

How does the displacer rod pass through the cap?

Through a Ø2 bore straight through the Ø16 centre boss, drawn at the 2 mm rod (fit: run); the bore itself is the guide.

Where does the transfer tube connect?

To the integral Ø4 hose barb (barb-4mm profile) 0.3 × the can diameter off centre, 19.8 mm on the 66 mm cap.