G&L Winslomatic HR-947 Precision Drill Grinder - 1983 - Helical & Split Pointing

1983 Giddings & Lewis WINSLOMATIC HR-947

Serial Number: 947-00056-83 | Type: Auto Drill Point Grinder | Origin: USA

Overview

The HR-947 is a 1980s-era industrial workhorse, built during the transition to higher-precision automated grinding. This specific 1983 model features the classic heavy-duty American casting but incorporates the refined cam-driven "Winslow" point geometry that remains the gold standard for aerospace and CNC tooling. It is designed to produce symmetrical, self-centering points that eliminate the need for center drilling.

Technical Specifications

• Year of Manufacture: 1983
• Serial Number: 947-00056-83
• Drill Capacity: 1/16" to 1-1/2" diameter
• Point Angles: 90° to 140° (Adjustable)
• Point Styles: Conventional, Split Point, Helical, and Four-Facet
• Grinding Wheel: 12" diameter standard
• Workhead: Automatic indexing cam-driven system
• Coolant System: Integrated tank and high-volume pump
• Power: 220/440V, 3-Phase
• Machine Weight: Approximately 1,800 lbs

Key Features

• Symmetry Control: The 1983 HR series is legendary for its ability to maintain perfect lip-to-lip symmetry, crucial for modern high-speed drilling.
• Automated Cycle: Once set, the machine automates the grinding cycle, reducing operator error and ensuring uniform results across large batches of drills.
• Rigid Construction: Built with heavy-duty vibration-dampening iron to ensure a superior surface finish on carbide and cobalt cutting edges.
• Versatile Pointing: Capable of generating "Self-Centering" helical points, which are highly sought after by shops running high-feed CNC operations.

Dealer Note: A 1983 Winslomatic is arguably in the "Sweet Spot" of vintage machinery—it’s built with massive mechanical integrity but uses the standardized HR components that are still supported by specialists today. Serial number 947-00056-83 is an excellent candidate for a shop looking to reclaim expensive large-diameter drills or for a tool-regrinding business.