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Doweling
Techniques
After hot alignment check has been completed, the compressor, gear and drive must be
doweled to their soleplates. Doweling permits exact repositioning of components if they have to
be moved.
1.
Doweling must be completed with equipment at maximum operating temperature (full load).
2.
Use no. 8 taper dowels to dowel compressor, gear and drive to the base. Use a 13/32-in.
drill and no. 8 taper reamer with straight flutes. Drill pilot hole and then expand the pilot hole
to final dimension.
3.
Fit dowel so that 1/16-in. of taper is left above the equipment foot. If dowel holes are
rereamed as a result of re-alignment, be sure dowels are tight and do not bottom.
4.
Place dowels as nearly vertical as possible.
5.
Coat the dowels with white lead or other lubricant to prevent rusting.
6.
Tap dowel lightly into position with a small machinist’s hammer. A ringing sound will
indicate proper seating.
Dowel the suction end of the compressor base, the two feet at the high speed end of the
gear, and the drive feet in accordance with the drive manufacturer’s instructions. The number of
dowels used in the drive is usually four, but some manufacturers require more.