Halden & Co. — Field Instruments / Exploded Assembly

Model 04Hand Grinder

Fourteen machined components on a single vertical axis. Every one of them is replaceable at the kitchen table with the 2.5 mm hex key taped inside the lid — no adhesives, no press fits, no proprietary fasteners anywhere in the stack.

Open the stack ↓ Parts schedule

Drawn by: M. Ravensholt
Checked: J. Oyelaran
Parts: 14 / 9 serviceable
Dry mass: 612 g
Axis: A–A vertical
Issued: 2026-03-11

Fig. 1 — Axis A–A Explode 38%

Parts schedule — 14 items Top → base

Note 01

Assemble downward

Work top to base with the body inverted. The burr stack self-centres once the axle passes the upper bearing — never force the collar past its detent.

Note 02

Torque discipline

Crank screw — 0.6 N·m
Burr carrier — 1.2 N·m
Base ring — hand tight + 15°

Note 03

Do not lubricate

All bearings run dry by design. Oil migrates into the grind chamber within four weeks and will taint every dose afterwards. Brush only.

Table 1 — Fastener & tolerance schedule, revision C
Ref	Fastener	Thread	Torque	Fit
F-01	Crank retaining screw	M4 × 8	0.6 N·m	H7/g6
F-02	Collar detent pin	Ø2 × 6	press	H7/p6
F-03	Burr carrier nut	M8 × 1.0	1.2 N·m	H7/h6
F-04	Body tie rod	M3 × 44	0.9 N·m	H8/f7
F-05	Base ring	M52 × 1.5	hand +15°	H9/d9

Service programme

Every part on this sheet ships flat, forever.

We keep tooling for discontinued revisions. Tell us the sheet number stamped under your base ring and we will send the correct component — not the nearest current equivalent.