3.1 Foundation In general, the type of foundation adopted for motors depends largely on the foundation planned for their individual drives, and no rigid rules can be laid down apart from the obvious requirements that the foundations be strong and rigid. Much helpful guidance may be obtained from IS:2974 Parts 1 to 4, code of practice for design and construction of machine foundations.

3.2 Levelling Place the machine with its base plate or slide with the driven apparatus and pack the space between the machine and the foundation with steel plates evenly spaced 250 to 300 mm apart. Grout-in the holding-down bolts correctly and when the mortar has set hard, level up the base plate by adding or removing steel packing plates (shims).

Tighten the foundation bolts lightly at first, and carefully align the set with the driven apparatus. Then tighten the bolts fully and check the alignment, rectify if necessary. If machines surfaces are found to have warped, these should be leveled with shims it is important that the above mentioned packing plates are situated close to and on each side of every foundation bolt otherwise distortion of the base plate will most certainly occur.

The foregoing applies to individual units as well as to large base plate mounted complete sets, except that the latter are placed on machined flanges of heavy steel I- sections which are themselves sunk upto the top flange in concrete foundation to reinforce it and take the i-sections should be so positioned as to lie under heavy load points.

Finally, cover the bottom if the base plate with 25mm thick layer of concrete extending 50mm from the base plate on all sides, using temporary wooden curbs for this purpose.