bedplate

As these cylinders were to fit into holes bored in a steel bedplate, it was necessary to have a flange at one end.
The Boy Mechanic, Book 2|Various
The bedplate, cylinder and guides are bored at one operation and cannot get out of alignment.
Farm Engines and How to Run Them|James H. Stephenson
In one of the channels the bed of the trough slopes up slightly to the place where the “bedplate” is fixed.
The Manufacture of Paper|Robert Walter Sindall
Around the bedplate are located the oil-cooling coils, the oil strainer, the oil reservoir and the oil pipings to the bearing.
Steam Turbines|Hubert E. Collins

Mounted on the end of the bedplate is the oil pump, operated from the main shaft of the turbine as previously stated.
Steam Turbines|Hubert E. Collins

British Dictionary definitions for bedplate

bedplate

/ (ˈbɛdˌpleɪt) /

noun

a heavy metal platform or frame to which an engine or machine is attached

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012