DHR Series Getting Started Guide Page 21
Key Rheometer Components
The main components of the rheometer are described below. If you have a good understanding of the
design and function of each component, it will make efficient use of the rheometer easier. This section
describes, in detail, the design and functions of the:
• Casting
• Ball slide
• Magnetically levitated thrust bearing
• Radial air bearings
•Motor
• Encoder
• Axial force transducer
• Electronics
• Front panel
•Smart swap
• Auto GapSet Mechanism
•Display
Casting
The body of the rheometer is a single-piece aluminium casting, consisting of a base and column. The cast-
ing is an important component of the rheometer, as it needs to be rigid to axial and torsional stresses,
robust, and capable of being machined to high precision and accuracy to ensure correct alignment of the
other components of the instrument. Computer Numerical Control (CNC) machining is used to ensure con-
centricity, flatness and parallelism in the measuring system when attached.
Ball Slide
The instrument head assembly containing the motor, bearing, and optical encoder is mounted on a stiff,
linear motion, precision ball slide guide. The ball slide is mounted within the instrument column. A motor
located in the base of the casting drives the ball slide screw, moving the instrument head vertically. Its posi-
tion is measured by a linear encoder mounted on the ball slide.
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