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The Fax Machine
RU
EN
ES
Contents
Introduction
A little history
Lesson 1. Feed: the sheet runs through the rollers
1.1. Idea: the feed
1.2. Idea: a gear "on edge" and a right-angle drive
1.3. Build
1.4. Check
Paste for lesson 1 (Cmd+I)
Lesson 2. Sheet sensors: entry and exit
2.1. Idea: a flag lever
2.2. Idea: why the exit sensor sits right on the roller
2.3. Build
2.4. Check
Paste for lesson 2 (Cmd+I)
Lesson 3. The head: a carriage on a belt
3.1. Idea: the stepper motor
3.2. Idea: the head
3.3. Build
3.4. Check
Paste for lesson 3 (Cmd+I)
Lesson 4. Stepper motor driver
4.1. The task
4.2. How logic solves it
4.3. Which chips and why
4.4. Build: head driver
4.5. Build: feed driver
4.6. Check
Paste for lesson 4 (Cmd+I)
Lesson 5. A line: the carriage moves by itself
5.1. The task
5.2. How logic solves it
5.3. Which chips and why
5.4. Build
5.5. Check
Paste for lesson 5 (Cmd+I)
Lesson 6. A whole sheet
6.1. The task
6.2. How logic solves it: a sequencer
6.3. The sensor at the head INLINE
6.4. Build
6.5. Check
Paste for lesson 6 (Cmd+I)
Lesson 7. The board and the second machine: the first transfer
7.1. What goes down the line
7.2. Build: sending and receiving
7.3. The board FAXBRD
7.4. The second machine
7.5. Check: the first transfer
Paste for lesson 7 (Cmd+I)
Lesson 8. Quality: from 5 mm to half a millimetre
8.1. Why the copy is rough
8.2. Sensor spot and pen width
8.3. Gearing 16 → 32: a 1.3 mm step
8.4. Half steps: a 0.65 mm step
8.5. Check
Paste for lesson 8 (Cmd+I)
Lesson 9. Faster and straighter: both ways
9.1. Both ways
9.2. The dot pen
9.3. Receiver timeout
9.4. Build (inside the board)
9.5. Check
Paste for lesson 9 (Cmd+I)
Lesson 10. A5 format
10.1. Two different sensors
10.2. Logic
10.3. Build: mechanics
10.4. Build: board
10.5. Check
Paste for lesson 10 (Cmd+I)
Lesson 11. One line and the panel
11.1. One line
11.2. Build
11.3. Panel
11.4. Check
Paste for lesson 11 (Cmd+I)
Summary
All the parts
Instructions in pictures
Lesson 1 in pictures
← Back to the lesson: Lesson 1. Feed: the sheet runs through the rollers
1
The feed
the sheet runs through two rollers
kh
HT-07
1×
2×
2×
1×
1×
2×
0
2×
∞
© 2026 Daniil Khanin · khanin.info · HT-07
4
CANVAS
1
Mechanics → parts; mounting — drag the orange nut to the point
2
Feed roller — length by the handle; the sheet on top, its lower edge under the rollers
3
1×
2×
310
A4 · 210 × 297
© 2026 Daniil Khanin · khanin.info · HT-07
5
CANVAS …
4
select both pulleys → right button → Belt between pulleys
5
2×
1×
6
the motor gear lies flat, the gear on the end of roller 1 stands on edge
7
1×
2×
2×
16 · 16
Motor
RUN
ON
DIR
DIR
© 2026 Daniil Khanin · khanin.info · HT-07
6
CANVAS …
8
0
2×
2×
0
RUN
0
DIR
9
Fast
Fast mode: in Real the mechanics lag and skip steps
1
RUN
1
DIR
DIR, RUN — the sheet goes in
1
RUN
0
DIR
DIR 0 — back
© 2026 Daniil Khanin · khanin.info · HT-07
7
← Back to the lesson
Lesson 1. Feed: the sheet runs through the rollers