Assemble the Tachometer model kit and discover how it works.

A tachometer is a device designed to measure the rotational speed of various parts in engines and other mechanisms. It calculates revolutions per minute (RPM). The tachometer also measures and monitors load limits, in order to decrease or increase RPM so that the engine or mechanism runs within its optimal parameters.

The 3D Tachometer model kit from UGEARS' STEM Lab collection is a fully operational DIY wooden model of a tachometer, ready for you to assemble. When the handle is rotated, movement is transmitted through a reducer, increasing the RPM and displacing twin weights in the centrifugal unit. The higher the RPM, the more centrifugal force separates the weights, shifting a movable axle with a flywheel. A pointer mechanism (dial) is fixed to the axle; the more the axle shifts (higher RPM), the more the dial arrow deflects, indicating higher speed rotation.

The mechanism of the Tachometer model kit consists of:

• Handle
• Reducer
• Weights
• Axel
• Fly wheel
• Dial

The Variator-Tachometer system demonstrates the direct relationship between the transmission ratio of a gearbox and rotational speed.

When the handle of the Variator is rotated, the movement is transmitted through the reducer to the cone-shaped driving pulley. The rotation of the first cone is then transmitted through the belt to the other cone, which is the driven pulley. When the pedal attached to the housing is pressed, it shifts the fork holding the belt, thereby changing the rotational speed of the driven pulley. When the Tachometer is attached to the Variator, the changing rotational speed of the driven pulley of the Variator is transmitted to the Tachometer's reducer. This in turn will increase or decrease the centrifugal force on the weights, shifting the axle with flywheel. Shifting the axle deflects the indicator on the dial toward a higher or lower value. In this way, changes to the transmission ratio in the Variator will be seen to increase or decrease the RPM of the attached Tachometer.

Dimensions
Model size: 9.4 x 4.1 x 4.8 in. 
Package size: 8.1 x 7.4 x 2.5 in.

Weight
.94 lbs 

Number of Parts
133

Assembly Time
2 hours

Level
Easy

Shipping
We ship most in-stock merchandise within 24 hours of receiving your order. Standard ground delivery usually arrives in 5-7 business days.

Easy 30-Day Returns
If, for any reason, you are not 100% satisfied with one of our products, you may return it for a refund within 30 days of the purchase date. Please note, some items have additional return restrictions. For complete information on our returns policy and procedure, visit our Easy 30-Day Return Policy Page for full details.