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FT 102

- Measurement of the forces acting on the lathe tool


Technical Description

Investigation of cutting forces during turning is fundamental to the teaching of cutting techniques.The setup comprises a transducer, which also holds the lathe tool, and an amplifier unit with digital displays. The forces that act on the lathe tool during machining are measured in three directions: cutting force, feed force and passive force. The 3-component force measurement device uses a strain gauge system. The amplifier unit supplies the strain gauge bridges and displays the measured values on three digital displays.

The experiments must be conducted in a workshop environment, as a suitable lathe is required. 

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments
- measurement of forces in turning
  * influence of rotational speed, rate of feed, feed motion, lubrication and cooling conditions
- influence of the cutting geometry of the lathe tool 
- influence of the material being machined


[1] 3-component force measuring device for cutting experiments during turning
[2] lathe tool holder implemented as transducer with strain gauge system
[3] strain gauge amplifier unit with 3 digital displays for forces
[4] transducer with splash-proof housing 
[5] GUNT software for data acquisition via USB under Windows Vista or Windows 7

Technical Data
Force sensor
- number of force axes: 3 (x, y, z)
- measuring range: +/-5kN
- overload capacity up to: +/- 6,5kN
- breaking load: +/-8kN
- non-linearity: <1%
- supply: 10VDC
Strain gauge in full-bridge configuration

Dimensions and Weight
LxWxH: 365x315x150mm (measuring amplifier)
Weight: approx. 7kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery
1 measuring device for turning experiments, comprising strain gauge amplifier and transducer
1 GUNT software CD + USB cable
1 set of instructional material

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