The Foley Saw Chain Grinder Model 308 is a specialized tool designed for sharpening saw chains, ensuring optimal performance and longevity of the saw. This manual provides comprehensive instructions for its operation, maintenance, and the identification of its various components.

Function Description

The primary function of the Foley Saw Chain Grinder is to precisely sharpen the cutting teeth of saw chains. It is engineered to handle various chain types, including chipper and chisel chains, as well as specific series like the Oregon #80 chain. The grinder uses a rotating grinding wheel to remove material from the cutter teeth, restoring their sharpness and correct angles. This process is crucial for maintaining the efficiency and safety of a chainsaw, as dull chains can lead to poor cutting performance, increased fuel consumption, and potential kickback. The machine's design allows for accurate adjustment of grinding angles, depth, and other parameters to match the specific requirements of different chain types and desired cutting characteristics.

Usage Features

The Foley Saw Chain Grinder Model 308 incorporates several features to facilitate precise and efficient sharpening.

Adjustable Grinding Head: The grinding head can be tilted and locked at various angles (e.g., 30° for chipper and chisel chains) to achieve the correct top plate and side plate angles for the cutters. The grinding head scale (B) provides a visual reference for these adjustments.
Chain Vise System: The chain vise (C) securely holds the saw chain in place during the grinding process. It can be rotated and locked at specific angles (e.g., 35° to the left or right for chipper chains, 30° for chisel chains) using the chain vise scale (I) and the chain vise pivot lock (J). This rotational capability allows for sharpening both right-hand and left-hand cutters without repositioning the chain extensively.
Stop Finger Mechanism: A stop finger (G) with an adjust knob (F) is used to position each tooth accurately against the grinding wheel and to set the depth stop. This ensures consistent grinding depth across all teeth and prevents grinding too deep into the gullets or tie straps.
Depth Control: The depth control knob (A) allows the operator to set the desired grinding depth, ensuring that only the necessary amount of material is removed from each tooth.
Horizontal and Slide Lock Adjustments: The horizontal scale (D) and slide lock handwheel (E) enable precise positioning of the chain vise along the horizontal axis, which is important for aligning the tooth correctly with the grinding wheel and for adjusting for different chain pitches.
Foot-Operated Clamp (Optional): For enhanced convenience and speed, the grinder can be equipped with a foot-operated clamp. This allows the operator to quickly clamp and unclamp the chain, freeing up hands for other adjustments. The assembly involves slipping the end link of the chain over a lock rod, attaching a spring, and hooking it to a bracket. The foot pedal's height can be adjusted for comfortable operation and full clamping travel.
Motor Switch with Forward/Reverse: The motor switch allows for both "Forward" (counter-clockwise rotation) and "Reverse" operation of the grinding wheel. This is essential for sharpening both right-hand and left-hand cutters effectively, as the grinding direction needs to be appropriate for the cutter being sharpened.
Chain Pitch Measurement: The manual provides clear instructions on how to find the chain pitch by measuring the distance between three rivets and dividing by two. This measurement is crucial for selecting the correct grinding wheel and settings.
Standard Chain Chart: A comprehensive chart is included, detailing recommended wheel thickness, use gauge, and depth gauge settings for various chain pitches, simplifying the setup process for different chains.
Depth Gauge Grinding: The grinder can also be used to lower depth gauges, which is a critical step in maintaining proper cutting performance. A specific 5/16" thick grinding wheel, dressed to match the contour of the depth gauges, is used for this purpose. The grinding head and chain vise are set to 0° on their respective scales, and the depth control is adjusted to achieve the proper height.

Maintenance Features

Proper maintenance is vital for the longevity and safe operation of the Foley Saw Chain Grinder.

Grinding Wheel Dressing: The grinding wheel needs to be regularly dressed to maintain its correct shape and curvature, which is essential for achieving the desired tooth geometry. The manual describes a "freehand" method using a dresser against the running wheel and checking the shape with a radius gauge. The recommended wheel thickness varies by chain type, and narrower wheels can be dressed to fit specific gauges.
Pre-Grinding Chain Preparation: Before grinding, it is recommended to remove oil and pitch from the chain to prevent the grinding wheel from glazing and gumming. This not only improves grinding efficiency but also extends the life of the wheel.
Chain Inspection: Operators are advised to examine the chain for bent or cracked links, worn or broken drive links, and tight pin joints before grinding. Addressing these issues beforehand prevents further damage to the chain and ensures a more effective sharpening process.
Troubleshooting Grinding Errors: The manual highlights common grinding errors such as grinding too deep, excessive hook, and backslope. It provides guidance on how to identify and correct these issues by checking wheel radius, depth settings, and ensuring proper alignment.
Secure Mounting: The grinder should be securely mounted to a floor stand or workbench to ensure stability during operation, which is crucial for safety and grinding accuracy.
Parts List and Exploded View: The manual includes a detailed parts list and exploded view diagrams for both the grinder and the optional pedestal. This facilitates easy identification and ordering of replacement parts, ensuring that the machine can be repaired and maintained effectively.
One-Year Guarantee: Foley Manufacturing Company offers a one-year guarantee covering defects in workmanship or material. This includes free replacement parts for defective components returned postpaid for inspection, underscoring the company's commitment to quality and customer support. However, the guarantee does not cover damage sustained in transit or caused by misuse, emphasizing the importance of proper handling and operation.

In summary, the Foley Saw Chain Grinder Model 308 is a robust and versatile tool designed to provide precise and effective sharpening for a variety of saw chains. Its adjustable features, clear operational guidelines, and emphasis on maintenance ensure that users can achieve optimal cutting performance and extend the life of their saw chains.

Foley 308 - Page 17

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