Description
Precision high-speed micro air turbines drive the JET 1/8-Inch Pencil Die Grinder to polish injection molds, engrave serial numbers, and deburr delicate medical instruments with 50000 RPM rotary speed. Operating on 90 PSI shop air, the 90-degree angle head spins 1/8-inch mounted diamond burrs and carbide micro-cutters with zero vibration. Toolroom machinists polish mold ribs smoothly. Sized for microscope-level deburring, the pencil grinder consumes 1.5 CFM at idle and 6.0 CFM under full load.
Micro-Spindle Dynamic Bench Limits
Tachometer bench testing proves the precision micro-turbine motor maintains 50000 RPM free speed at 90 PSI dynamic line pressure, sustaining 44000 RPM under one pound of delicate diamond burr polishing pressure. Dial indicator testing on the 1/8-inch collet chuck confirms total indicator runout measures under 0.0003 inches, preventing micro-burr chatter and ensuring mirror-smooth mold cavity finishes. Operating noise measures an ultra-quiet 74 dBA at one meter distance.
Precision-machined aircraft-grade aluminum forms the slender pencil-style motor housing, featuring knurled grip bands that provide fingertip tactile control during detailed hand engraving. The 90-degree angle head houses micro-bevel gears machined from hardened steel, supported by miniature precision ball bearings. Sized for toolroom workbenches, the bare pencil grinder weighs 0.5 lbs, measuring 5.5 inches long with a five-foot flexible braided nylon air supply hose.
Key Features of JET JAT-421
Precision tool and die makers, jewelry engravers, and aerospace machinists buy JET 1/8-Inch 90-Degree Pencil Die Grinders to polish intricate mold cavities and deburr micro-castings. Compare professional pneumatic micro pencil grinder pricing to upgrade your precision toolroom finishing equipment.
- Ultra-high-speed 50000 RPM micro-turbine motor spins diamond burrs smoothly for mirror-finish mold cavity polishing cleanly.
- Compact 90-degree right-angle head reaches into deep injection mold ribs and narrow engraving recesses cleanly.
- Precision 1/8-inch collet chuck holds tool runout under 0.3 mils, preventing micro-burr chatter and extending diamond tool life cleanly.
- Slender pencil-grip body with knurled aluminum bands gives operators unmatched tactile control during delicate hand engraving cleanly.
- Includes flexible five-foot braided air hose with inline air strainer, shielding the tool from hose drag and line debris cleanly.
Micro-Mold Polishing Negative Filter
The twist-throttle ring regulates air volume smoothly, allowing delicate speed adjustments when detailing intricate mold contours. Do not buy this specialized micro pencil grinder for heavy 1/4-inch weld cutoff operations, structural steel deburring, or running on unregulated dirty air lines lacking an inline micro-filter and oil lubricator. Routine care requires adding two drops of high-speed spindle oil into the air inlet daily before connection, wiping the collet cone clean of abrasive slurry, and checking hose fittings.
Factory Warranty Hardware Manifest
JET Tools covers this micro pencil die grinder with a 1-Year limited manufacturer warranty covering turbine rotor components, micro-bevel gears, and spindle bearing assemblies. The factory shipment package includes one 1/8-inch right-angle pencil grinder, braided air hose, collet wrenches, and technical user manual.
