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Model 252S Rush Drill & Tool Grinder
The Rush drill and tool grinders incorporate versatility, rapid set-up and accuracy into rugged and affordable machines. Our unique design features point splitting and web thinning capability and it allows quick grinding of almost any HSS or carbide drill point. Stepdrills, taps, reamer, countersinks and endmill ends are easily ground with minimal setup changes.
See all the Rush models on our 13-minute video or CD. Contact your dealer or Rush Machinery for a free copy.
Key Benefits
 | Versatility - sharpens many drill and tool geometries and materials |
Model 132C Capacity: .080" to 1.250" (2-32 mm) diameter
Models 250A & 252 Capacity: 3/32" to 2" (2.5-51 mm) diameter
Models 380 & 382 Capacity: 3/16" to 3-1/8" (5-80 mm) diameter
| Rapid set-up |
| Large capacity range |
| Rugged |
| Affordable |
| Easy to use |
| Easy to Maintain |
| Parts and accessories in stock |
Accuracy and Productivity
Holemaking is by far the largest and most expensive machining operation. The process involves drilling, tapping, reaming, countersinking and counterboring. These operations are slowed down by worn tools, inaccurate tools and tools with improper geometry. This further increases expenses by creating more frequent machine down time and tool changes, greater scrap losses, and higher costs for tool purchase, inventory and regrind.
Rush drill and tool grinders are designed to reduce holemaking expenses by allowing companies to quickly and accurately regrind their tools to the proper geometry as required.
Drill Points
Point Thinning
Split Point : Self-centering, reduces thrust. For deep holes are harder materials.
Web Thinning : For thick web and parabolic drills. Aids centering and allow increased feed rates.
Spiral Point : Self-centering. Increased feed rates.
Lip Correction : Corrects the flute spacing and thins the web. Also modifies the rake angle and can create chip breakers.
Sheet Metal Point : Self-centering. Reduces burrs and deformations in thin materials.
Double Angle : Cast iron point. Combination of 118 and 90 degrees extends drill life and improves the hole finish.
Four-facet : Self-centering. Improves hole accuracy.
Flat-bottom : Produces flat bottoms in holes for special applications.
Plastic Point : Allows very high feed rates and eliminates burrs when drilling plastics.
Tools and Grinding
| Parabolic flute drills. The point can be ground and split or web-thinned. |
| Slow spiral and fast spiral drills can be ground. |
| Left-hand tools. All drills, taps, reamers, countersinks and endmills that can be ground right-hand can also be ground left-hand. |
| Step tools. Grinds step drills, step reamers, drill and countersinks, drill and counterbores, as well as drill and taps. |
| Center drills (combination drill and countersink). Regrind point and step. |
| Taps. Grind chamfer to almost any angle, length and relief. (2, 4, 6, 8, flute on 250A and 380; 2, 3, 4, 5, 6, 7, 8 flute on 132C, 252 and 382). |
| Reamers. Resharpen and resize. (4, 6, 8, 10, 12 flute on 250A and 380; 4, 5, 6, 7, 8, 10, 12 on 132C, 252 and 382). |
| Countersinks. Resharpen fluted and hole-type. (1, 2, 4, 6 flute on 250A and 380; 1, 2, 3, 4, 5, 6 flute on 132C, 252 and 382). |
| Endmills and counterbores. Grind primary, secondary and gash in one set-up. O.D. grinding requires separate attachment. (2, 3, 4, and 6 flute; 2, 3, 4 flute on 132C). |
| Carbide and carbide-tipped tools. Grind carbide and carbide-tipped drills, reamers, countersinks and endmills. |
| Core drills. Sharpen coredrills used for enlarging pre-drilled or pre-cast holes. ( 3 and 4 flute.) |
Sample Tool Grinding
Send us some sample tools for grinding. Let us know your application and needs. We'll grind your sample tools for you to test.
Construction
All of the models feature ruggedly constructed dovetail ways with adjustable tapered gibs. They are covered by accordion or metal covers. The traverse way has an adjustable stop. The infeed and traverse feed handwheels are graduated in thousandths of an inch or metric increments.
The grinding spindle assembly incorporates permanently lubricated and sealed ball bearings. The spindle shaft has a standard tapered end to minimize run out, which is a particular advantage when using diamond or CBN grinding wheels.
The workhead uses needle bearings throughout, with the exception of the main spindle, which uses a high precision rotary-linear ball bearing to ensure a maximum deflection of less than .00015" (.004mm). Tools are held precisely in a self-centering, six-jaw chuck (other types of workholders are available). The chuck covers the entire range and ensures that the cutting lips are ground equally in both angle and height to produce an accurate point. The workhead uses hardened cams and shafts and the cam change takes only five seconds. When no cams are in place, it can be used to spin grind or index grind (12 positions).
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