# Mixer tip speed

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Section summary
How to calculate the tip speed of a mixing tool
Use of tip speed

Powder Mixing (main page)
# Types of mixers
# Mixing mechanisms
# Mixing time
# Mixing speed
# Mixing volume
# Mixing power
# Froude Number
# Coefficient of Variation
# Homogeneity
# Tracer
# Segregation / demixing
# Tip speed
# Sampling
# ATEX speed
# Mixer Bearing seals
# Mixer discharge valve

### Calculation of Tip Speed

The tip speed of the mixer's agitator - sometimes also called mixing tool - can be calculate the following way

Equation 1 : Tip Speed calculation

With :
- R is the radius of the mixing tool (center of shaft to tip of paddle) in m
- n is the mixing speed in rpm

### Why calculation the tip speed ?

The tip speed of the mixer is a very important data to determine the mixing regime thanks to the Froude Number but also to verify that the agitator speed is not exceeding 1 m/s whenever the mixture in its explosivity range (ATEX), typically when loading and discharging the mixer. The mixer speed in rpm at which the tip speed equals 1 m/s is called the ATEX speed of the mixer.

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