Answer Posted / jahid
Every application requires selection of the right type of
component and shaft/bushing configuration.
Whether the component is a precision potentiometer, panel
control or rotary encoder, selection of the
right shaft/bushing configuration will yield the optimum
performance of the component in its
intended application.
There are two general categories of applications that should
be considered when selecting a component. These categories
are Human-to-Machine Interface (HMI) and Machine-to-Machine
Interface (MMI).
HMI applications commonly appear on the front panel of an
application as manual adjustments. These
devices are typically mounted to a panel (as shown in Figure
1) with a sleeve bushing and have a knob
mounted on the end of the shaft. In these applications, high
speed of rotation and shaft side load are
normally not encountered. On some models, a sleeve bushing
is available with front ball bearings
should the designer wish to have a very low shaft torque, or
front and rear ball bearings for
applications where the shaft will likely encounter up to 0.5
oz of side load due to an oversized knob or
other similar design factors.
Many MMI applications are position sensors where adjustments
will be made by mechanical interface.
Position sensor designs include hospital beds, dental
chairs, fluid control valves, elevators, automatic
doors and lift trucks. These sensors can also be used to
count rotations of a motor via a mechanical
coupling device. In MMI applications, a high speed of
rotation may be encountered along with a shaft
side load exerted by either a pulley or gear system. For
these applications, the front ball bearing option
or front and rear ball bearing option and servo mount
configuration (as shown in Figure 2) is highly
recommended.
Configurations made for MMI applications may be used in HMI
applications where the designer
would like the additional robustness and extended rotational
life. However, configurations made for
HMI applications are not recommended for use in MMI applications
| Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
key phaser where is use and work
Draw symbols of the following :
What is the meaning of wet leg
what is span value and zero ? and how set ?
how pressure transmitter work, what is its principal to measure and how its generate signal. for pressure transmitterinstallation which precautions must be taken ??
anybody having Qatar Petroleum questions for instrument Technician offshore ....please send me
How to Calibrate Level Troll in field
please can any one tell me clearly about pid tuning i am confusing about this .how to tune pid easly?
what are the values of fuel flow rate in various places in boiler.
hi my name is rakesh patel i just complited my be in instrumentation & control now i am going to working as a validation engineer in a poject department so what is a scope in a future as a validation engginer ? what line is good for me can any bady give me complete solution please? your regard rakesh patel
Calibration of controller (pneumatic)
What is difference between ESD and PLC please Explain me clearly.
how u calibrate pneumatic n motorized c/v?
what is RTV function in in process control?
what is the imbustion control loop
