OK, I'm going to combine my hate of time-traveling robot questions with my distaste for story identification questions, and try to leverage all'y'all's wisdom to help me remember a story about time traveling robot.
Details I recall:
A story involved a time-traveling robot (duh)
It was pretty old (before 1970)
The robot was somewhat confused by the time travels, and mistook the protagonist for an Ivan the Terrible (the Russian Tzar).
The robot somehow helped turn the protagonist into assorted historical figures (said Ivan the Terrible and if I recall correctly, a Neanderthal?)
I vaguely recall that the robot could drink some intoxicating (to him) electrical "drink".