Internal grinding machine

An internal grinding machine comprising:

• a base;
• a first wheel carrier table slidably mounted on said base and slidable along a first axis;
• a second wheel carrier table mounted on said first wheel carrier table and being mounted for slidable movement along a second axis and having a plurality of grinding wheel spindles mounted thereon;
• a shift infeed table slidably mounted on said base and slidable along a third axis disposed at an angle with respect to said first axis and supporting thereon a work spindle head for holding a workpiece;
• means for selectively advancing said shift infeed table along said third axis so as to selectively position the workpiece held on said work spindle head adjacent and facing respective ones of said grinding wheel spindles;
• an infeeding mechanism mounted on said base operable after said shift infeed table has positioned the workpiece adjacent and facing a first one of said grinding wheel spindles to effect infeeding movement of said shift infeed table to thereby effect infeeding of the workpiece held on said work spindle head along said third axis relative to said first one of said grinding wheel spindles whereby a first grinding operation can be performed on the workpiece;
• and another infeeding mechanism mounted on said base operable after said shift infeed table has positioned the workpiece adjacent and facing a second one of said grinding wheel spindles to effect infeeding movement of said first wheel carrier table along said first axis to thereby effect infeeding of said second one of said grinding wheel spindles relative to the workpiece held on said work spindle head whereby a second grinding operation can be performed on the workpiece.