These automatics are suitable for performing the following operations (under manual control or on a semiautomatic cycle, using a NC unit and automatic in-process size monitors):
The automatics are available in a standard model and in a NC modification.

• traverse and plunge-cut grinding of straight and taper surfaces;
• traverse and plunge-cut grinding of holes;
• grinding of flange and end surfaces.

DESIGN FEATURES

   Infinitely variable workpiece rotation frequency, cutting speed, and longitudinal feed rates make it possible to perform grinding under optimum conditions.
   Provision of the grinding wheel drive overload relay enables the operator to change over to rough feed when rapidly approaching the wheelhead, which adds much to the machine output. Grinding wheel wear is compensated both manually and automatically. The wheelhead spindle is supported on two special-design plain bearings, each having three similar shells shaped as separate segments. The shells rest, with their spherical depressions, upon the spherical-head screws, whereby the shells self-aligned with the spindle journals.
   The design of the shells makes provision of an oil wedge formed in between the shells and the spindle journal, which prevents the shells from overheating and premature wear.
   Forced continuous-flow lubrication of the spindle mates use of oil from a separate tank located outside the machine, which reduces the headstok heating temperature. Provision of an automatic monitoring of the presence of lubricant in the wheelhead spindle bearings ensures operating durability of the bearings.
   The automatics are equipped with an in-service grinding wheel balancing device, which comprises a wheel balancing mechanism and an electronic vibration amplitude indicator. The wheel balancing device is featured by high-speed, reliable operation, simple control and convenient attendance, which contributes to higher production output and quality of surface finish attained.
   Grinding wheel in-process dressing can be carried out with a hydraulically operated truing dresser which is engaged automatically. The wheel dressing repetition rate is variable to suit a required quality of surface finish on the work-piece being ground and depending on the grinding wheel endurance.
Grinding wheel radial dressing can be performed with the truing dresser held to the machine table.
   Provision is made in the automatics for use of automatic in-process size monitors with a suspended and a table-mounted snap gauge.
   The automatic in-process size monitors make it possible to:

• attain higher size measuring accuracy;
• increase the rate of adjustment to a preset size due to the provision of a high-speed cylinder and free travel of the monitor movable components by virtue of constantly applied forces independently of one another throughout the length of travel;
• eliminate possible errors induced due to vibration of the top measuring stylus during workpieceu rotation.

Accuracy of a specimen cylindrical surface:

• consistency of a diameter in a longitudinal section - within 3 µm;
• ovality - within 1,0 µm;
• Flatness of a specimen end face (concavity only) - within 3.6 µm;
• Surface roughness Ra attainable by the grinding process - within 0.125 urn