Rolls-Royce Archives
         « Prev  Box Series  Next »        

From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test report on the lag in action of an actuator box and switch, detailing electrical resistance, current, and load measurements.

Identifier  ExFiles\Box 34\3\  Scan055
Date  15th December 1919
  
R.R. 235 a (100 T) N.Y. 575. 16.4.19(G) 3254

X.2641.

Dec.15th 1919.

X.3428 - LAG IN ACTION OF ACTUATOR BOX. X.3748.
X.2641.

(a) Standard Actuator, Main Switch & Push Button Switch.

Resistance of Main Switch coil cold = 9.0Ohms.

Current to just cause full contact = .75 amps.

Clearances conformed with the standard given.


Resistance of Actuator coils = 4.27 ohms.

Least current for "click on" = 1.45 amps.

Motion at end of arm = .200"

Force applied to end of arm to cause "click on" = 2 lb. 8 ozs.


Actuator box and main switch were connected
in parallel across a 12 volt battery.

Current through actuator coils = 2.63 amp.turns = 3200

" " main switch coil = 1.20,
Amp. turns = 1100

Maximum load lifted by actuator arm = 42 ozs.
(coil cold).

If push button contact made slowly, there is
noticeable lag of actuator, when load on arm is 75% of
maximum which actuator is capable of lifting. When load on
arm is 92% of maximum, there is no pull on, if only the
carbons of push button make contact.

Contd.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙