High Speed Air Grinder Toolposts, P/N 8976 and 8987

In most machining conditions it is not necessary to achieve tool speeds faster than the 10,000 RPM that can be produced with the standard DC motor spindle with optional P/N 4335 high speed pulley set. However, for engraving and other applications where extremely small, pointed tools are used, higher speeds are required for good finishes and acceptable feed rates. This spindle is capable of speeds up to 54,000 RPM and will hold 1/8" diameter cutting tools in its collet spindle. Three carbide tools with various cutter face angles are provided with your engraving head along with 7 grinding tips.

The high speed spindle fits into the hole in the toolpost and a screw is tightened laterally to secure it in place. Do not overtighten this or the holddown screw that secures the toolpost to the table. The grinder can be used for putting a fine finish on hard parts, but it does not have the high torque needed to remove larger quantities of metal.

See more on the P/N 8900 high speed grinder for more details on its use.

Precautions!

A carbide tool is being rotated at extremely high speeds. Should it shatter, pieces are flung outward at high speed. While eye protection is always recommended for any machining operation, good eye protection is absolutely imperative when using high speed tools like this.

Spindle installed on a Sherline CNC mill. (Click photo to view larger image.)

Spindle Speed—up to 54,000 RPM (adjustable)

Collet Size—1/8"

Maximum Air Pressure—90 PSI (after break-in period at slower speed)

Suggested Lubrication—SAE #10 oil at 2 drops per minute in lubricator fitting in air line

Compressor HP—About a 1.5 horsepower compressor is required to supply sufficient air volume at 90 PSI

READ INSTRUCTIONS FOR USING THE LINEAR CONTROLLER (Click on your choice.)

.pdf Version (The same as our printed instructions. Requires Adobe Acrobat program to view.)