Fill cam is a crucial part of tablet press machine. It is important to select the proper fill cam size to achieve the target tablet weight. Here is the calculation process of fill cam size by calculating the dosing cam depth and simply adding 2-4 mm.
h = W ÷ [(D)2 × (π/4) × ρ]
Here,
- h = Filling (dosing) depth (mm)
- W = Standard tablet weight (mg)
- D = Punch surface (mm2) for round punch. Punch surface for capsule shape punch = length × width.
- Π = 3.14
- ρ = Bulk density
Recommended Fill Cam = h + (2 to 4 mm)
Example,
If tablet target weight is 1750 mg and bulk density is 0.70 g/ml.
For 14.0 mm round tooling:
h = 1750 ÷ [(14)2 × (π/4) × 0.70] ≡ 16 mm
Recommended Fill Cam ≡ (h + 2) mm ≡ 18 mm
For 19.0 × 10 mm capsule shape tooling:
h = 1750 ÷ [(19.0 × 10.0 ) × (π/4) × 0.70] ≡ 17 mm
Recommended Fill Cam ≡ (h + 2) mm ≡ 19 mm
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