Models 250A & 252
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Model 252S semi-automatic version shown.wpe94351.gif (105055 bytes)

The Model 252 is the most versatile drill and tool grinder available today.  The 252 can grind odd numbered fluted tools (1, 3, 5, & 7) as well as even numbered fluted tools (2, 4, 6, 8, & 10).  This is achieved with the use of a unique dual-cam workhead.  The inner cam rotates at a 2:1 gear ratio to grind even numbered fluted tools,  The outer cam rotates at a 1:1 ratio for odd numbered fluted tools.

The Models 250A and 380 have the 2:1 ratio only.  All models use hardened cams and the cam change takes only 5 seconds.  When no cam is in place, the workhead can be used to spin grind or index grind (12 positions).

The Model 252 is available in manual, semi-automatic and automatic infeed versions.

wpe45866.gif (93618 bytes) Model 250A manual version shown.

The Model 250A incorporates wide capacity and versatility in an affordable package.  The innovative design of the 250A allows for the grinding of almost any drill geometry, and most are completed in a single chucking.  The versatility also extends to taps, reamers, countersinks and endmills.  Many of these tools can be ground with very little change in setup.

The basic manual model is shown here and it is also available in semi-automatic and automatic infeed versions.

Selected Optional Accessories

Semi-Automatic Version

The power-driven workhead of the semi-automatic version offers a quiet, smooth rotation of the workhead.    Manual effort is reduced for heavier grinding and spin grinding operations.  Sparkout is allowed to occur by using a minimum of manual infeed along with a reduction in workhead rotation.  The speed is controlled by a conveniently located valve; the adjacent four-way valve allows grinding in either direction.  A hand knob on the workhead is used for indexing and setup.

Automatic Infeed System

wpe81744.gif (146708 bytes)The semi-automatic versions can be equipped with the automatic infeed system (except the Model 132C).  This can increase productivity by allowing the operator to do other nearby tasks while the drill  is being ground.  The system allows manual or semi-automatic grinding of all tool grinding, and use of the automatic infeed for standard drill points, countersinks and reamers.  The grinding rate is adjustable and the counter can be preset for 1-99 cycles.  An electroplated CBN wheel (standard) is used with the automatic infeed and requires no dressing.  Larger, three-phase motors are standard and an ammeter is provided to monitor the grinding load.

Overhead Wheel Dresser            wpe61907.gif (111161 bytes)

Timesaving option allows truing of the grinding wheel O.D. without changing the setup.

 

Features:

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Sealed linear bearing with hardened guide shafts

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Detented downfeed in .001" increments

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Hardened downfeed screw with wiper seal

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High-quality diamond included for truing standard and ceramic wheels

Air bearing Fixture                wpe58979.gif (215759 bytes)

Allows precision sharpening of endmills, reamers, shell mills and other cutters.  The spindle is supported with a thin film of air providing nearly frictionless motion, resulting in a smooth, even grind.  The fixture quickly mounts on the Model 132C, 250A, 252, 380 or 382S grinders, or is available with a universal base to fit most tool and cutter or surface grinders.

Features:

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Hard chrome plated and ground spindle with a 10" stroke.  Tools are held in 5-C or 5-CG collets or extension bushings for up to 2" (50 mm) shanks.

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Flute finger has dovetail crossfeed and micrometer vertical adjustment.

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Direct angle settings for up to 20 degrees for the O.D., 360 degrees for rotation, and 30 degrees for tilt (fore and aft).

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Rocker arm tilts fixture away for easy movement from one flute to the next.

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Grinds the O.D. of any number of flutes and includes 12-position index plate (others available) for end grinding.

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Unique micrometer infeed built into fixture.  Allows fine-feeding of the tool into the wheel.  It is graduated in .001" (or .04 mm) of diameter.

Specifications - Models 250A & 252

Capacity:    3/32" to 2" (2.5 to 51mm) diameter straight or taper shank

Drill Point Angles:    40 to 180+ degrees

Motor:  TEFC 1/2 Hp, 115/230V, 60 hz, single-phase (standard on manual and semi-automatic versions).  TEFC 1 Hp, 208-230/460V, 60 Hz, three-phase (standard on auto-infeed version; optional on manual and semi-automatic versions).  50 hz & other voltages are available

Dimensions:    44" (118 cm) wide x 42" (107 cm) deep x 53" (135 cm) high

Weight:    Manual:  590lbs (268kg) net; 710lbs (313kg) crated

                Semi-Automatic:  610 lbs (277kg) net; 730lbs (332kg) crated

                Auto Infeed:  650lbs (296kg) net; 770lbs (350kg) crated

For full 250A specifications, click here:  Spec250A.doc or Spec250A.pdf

For full 252 specifications, click here: Spec252.doc or Spec252.pdf

Sample Tool Grinding 

Send us some sample tools for grinding.  Let us know your application and needs.  We'll grind your tools for you to test.

Demonstration Video Tape

See all the Rush models on our 13 minute video tape or CD.  Contact your dealer or Rush Machinery for a free copy.

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