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Split probe clamps for Ø3, Ø4.8, Ø6 probes and Ø8 / Ø9.53 dial-indicator stems

What are DS18B20 waterproof probe and K-type thermocouple probe dimensions? · Hardware · basis: Common probe sizes: DS18B20 sleeve Ø6 × 50, K-type sheathed Ø3 / Ø4.8 (3/16 in); dial-indicator stems Ø8 (metric) / Ø9.53 (3/8 in); M3 pinch at ISO 273 clearance

Long Earth Society build part. Hot-end thermocouple, cold-side DS18B20 and the flywheel RPM pickup on every LES engine. 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
5 in table

Notes

  • Each clamp is a 20 mm tall block, (bore + 10) × (bore + 12), with the bore at the probe or stem diameter exactly, a 1.2 mm pinch split from the bore to one edge, and a Ø3.4 (M3 clearance) pinch-screw hole crossing the split 3.5 mm outside the bore.
  • DS18B20 waterproof probes have a Ø6 × 50 mm sleeve (a 30 mm version exists) and read −55 to 125 °C, so they belong on the cold side.
  • K-type sheathed probes are Ø3 or Ø4.8 (3/16 in) × 100–150 mm and read to about 1100 °C; bare-bead K-type (0.3–1 mm wire) goes to about 1000 °C.
  • Dial-indicator stems are Ø8 mm (metric) or Ø9.53 mm (3/8 in); I clamp one on the displacer rod to measure stroke while turning the engine by hand.

Sizes

clampbore_mmbody_mmfor
probe-clamp-k-type-3mm313 × 15 × 20K-type Ø3
probe-clamp-k-type-4-8mm4.814.8 × 16.8 × 20K-type 3/16 in
probe-clamp-ds18b20-6mm616 × 18 × 20DS18B20 sleeve
probe-clamp-dial-indicator-8mm818 × 20 × 20metric indicator stem
probe-clamp-dial-indicator-3-8in9.5319.53 × 21.53 × 203/8 in indicator stem

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
probe boreØ6 / Ø3 / Ø4.8 / Ø8 / Ø9.53probe sheath or indicator stemclampprobe-clamp-*
pinch split1.2closes on the probeclampprobe-clamp-*
pinch screw holeØ3.4M3 screw clearancedesignedprobe-clamp-*

Where the files are

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

WikipediaThermocouplewebCC BY-SA 4.0 (text)
WikipediaHall effect sensorwebCC BY-SA 4.0 (text)
WikipediaDial indicatorwebCC BY-SA 4.0 (text)
Analog DevicesDS18B20 datasheetPDFManufacturer datasheet
Long Earth SocietyEngine and rig buildsweb, videoLES site

Free files

★ Free files 5 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

probe-clamp-ds18b20-6mmsplit clamp for a Ø6 probe/stem (ds18b20 6mm): Ø6 bore, 1.2 mm split, M3 pinch (Ø3.4)STEP · STL
probe-clamp-k-type-3mmsplit clamp for a Ø3 probe/stem (k type 3mm): Ø3 bore, 1.2 mm split, M3 pinch (Ø3.4)STEP · STL
probe-clamp-k-type-4-8mmsplit clamp for a Ø4.8 probe/stem (k type 4 8mm): Ø4.8 bore, 1.2 mm split, M3 pinch (Ø3.4)STEP · STL
probe-clamp-dial-indicator-8mmsplit clamp for a Ø8 probe/stem (dial indicator 8mm): Ø8 bore, 1.2 mm split, M3 pinch (Ø3.4)STEP · STL
probe-clamp-dial-indicator-3-8insplit clamp for a Ø9.53 probe/stem (dial indicator 3 8in): Ø9.53 bore, 1.2 mm split, M3 pinch (Ø3.4)STEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=probe-clamps

Split probe clamps for Ø3, Ø4.8, Ø6 probes and Ø8 / Ø9.53 dial-indicator stems, isometric render of a generated part
Render of probe-clamp-ds18b20-6mm from the free STEP; not to scale.

How it fits

Goes in or on

Tri-clamp sanitary ferrule, 1/2 to 4 inchK-type at the hot end, DS18B20 on the cold spool

Connects to

Socket head cap screws, M2–M8M3 pinch screw through the Ø3.4 hole

Also needed

Hall sensor mount for TO-92SRPM alongside temperature

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Questions

What are the dimensions of a DS18B20 waterproof probe?

A Ø6 mm sleeve, 50 mm long (30 mm versions exist); it reads to 125 °C.

What diameter are K-type thermocouple probes?

Sheathed probes are Ø3 or Ø4.8 mm (3/16 in), 100–150 mm long.

What diameter is a dial indicator stem?

8 mm on metric indicators, 9.53 mm (3/8 in) on US ones.