16mm camera, restoration is in progress.
⚓ Links
⚓ 12V Motor repair
Motor itself is a KB 3 from VEB Elektromotorenwerk Hartha, Kreis Döbeln.
- Typ. FM 50 /40
- Nr. 62/61846
- Mot. KB 3
- ??? Hz
- 11 V (apparently powered 12V)
- 7.5 A
- 40 W
- 6000 U/min
- F. 7123
Seems to be delivering 0.06366666666666666 Nm of torque.
Brushes are 5x6mm, length is at least 10mm, length of wire 13mm, with a washer on it on the end, hole of ~2mm
Bearings:
- markings: “ELG”,“TKF”, “2”, open bearing, 19mm OD, 6mm ID, 6mm thick
- markings: “ELG”, “TKF”, “1”, open bearing, 16mm OD, 5mm ID, 5mm thick
⚓ Gearbox
Two identical bearings:
- no markings, open bearing, 10mm OD, 3mm ID, 4mm thick
Ratios:
| Speed | In (motor, turns) | Out (camera, turns) | Input RPM | Output RPM | FPS |
|---|---|---|---|---|---|
| 1 | 1 | 1 | 6000 | 6000 | 96 |
| 2 | 1 | 0,667 | 6000 | 4002 | 64 |
| 3 | 1 | 0,5 | 6000 | 3000 | 48 |
| 4 | 1 | 0,25 | 6000 | 1500 | 24 |
| R | 1 | 0,198 | 6000 | 1180 | 19 |
One turn of the shaft on camera side correspond to one frame.
So with corrected calculations we should get:
| FPS | “real” RPM | Gearbox output calculation |
|---|---|---|
| 96 | 5760 | 6000 |
| 64 | 3840 | 4002 |
| 48 | 2880 | 3000 |
| 24 | 1440 | 1500 |
| 19 | 1140 | 1180 |
⚓ Pictures
