# How to calculate the output rotational speed? ### How to calculate the output rotational speed?

It is defined by the ratio between the speed entrance and that of exit. It is therefore easy to calculate speed of exit (n2) if we know the speed input (n1) and the gearbox index (i). Just divide the speed of exit by the index.

### How to calculate the speed of a wheel?

The frequency is the number of revolutions per second, i.e. 1 revolution/s or 1 Hz. in one minute the wheel does 60 rounds; in 20 minutes wheel does 60* turns.

### Which crown for a pinion of 13?

On our CBRs, we cannot put smaller than one pinion of 13 teeth. We therefore have in our bag 13 sprockets14 and 15, and crowns of 44, 46 and 47.

### Why change the gearbox output sprocket?

2 reasons can lead you to dismantle a pinion : Replace a pinion original worn by a standard model, Exchange a pinion against a model of different size to play on the performance of your mécaboite.

### How to calculate gear ratio?

For calculate the gearing down, just make the ratio between the two gears engaged in a gear. Here, the diagram indicates that the first gear is engaged with a 16 pinion for the primary shaft and a 38 pinion on the secondary.

### How to measure the rotational speed of a wheel?

A cyclometer allows measure speed linear v of the wheel. A tachometer allows measure the frequency of spin n of the wheel.

### How to calculate the number of sprocket teeth?

the diameter of the pitch circle (or pitch diameter) divided by the Number of teeth : m = d/z; the height of teeth divided by 2.25: m = h/2.25.

### What is the difference between a left gear and a gear ratio?

Left gear: gear whose axes are neither parallel nor concurrent with rotation. Transmission ratio (R): ratio of the output angular speed to the input speed, i.e. also the number of teeth of the input – called driving – over the number of teeth of the output – called driven – of the gear .

### How big is a gear?

The smallest have gears of a few tens of nanometers in diameter, the record being a gear consisting of two six-tooth gears 1 nm in diameter.

### What is the difference between a concurrent gear and a transmission ratio?

Competing gear: gears whose axes have a point of intersection. Transmission ratio (R): ratio of the output angular speed to the input speed, i.e. also the number of teeth of the input – called driving – over the number of teeth of the output – called driven – of the gear .

### What is the pressure of a gear?

In the case of the classic gear, and more particularly of the standard gears, the base circles are brought together so that the interior straight line forms a pressure angle α with the perpendicular to the straight line which passes through the axes. According to the standard, α is 20° or 14.5° for old gears.