Percival Plus® Percival Plus is a tandem mounted tri-cutter saw chain power tool accessory designed for controlled and aggressive carving, as well as finishing applications.

The following instructions are provided to increase your knowledge of this tool accessory’s safety and operation. Please study them carefully before your initial use and it will provide you with many hours of productivity and enjoyment.

YOUR SAFETY IS OUR FIRST CONCERN MANDATORY SAFETY AND TESTING INSTRUCTIONS
WARNING: Any power tool with a worn chuck or collet is an unsafe power tool. Percival Plus must not be used on a power tool with a worn collet, chuck or mounting shaft. To prevent serious injury, you must determine the condition of the chuck, collet or mounting shaft in the power tool intended for use. The following tests must be performed prior to assembling Percival Plus.

TESTS ARE MANDATORY. The vibration caused by a worn chuck, collet or mounting shaft can result in Percival Plus (or any accessory) traveling out of the collet or chuck. Should this occur, the mounting shaft on Percival Plus could bend, causing extreme vibration and possible loss of control of the power tool.

VERY IMPORTANT: PRIOR TO CONDUCTING TESTS: Comply with safety and operating instructions published by manufacturer of power or air tool used in conjunction with Percival Plus.

Percival Plus comes in three models. Please refer to the Power Units Section for recommendations of your specific model. In summary, depending on the model, they can be used on flex shaft machines, electric mini de grinders or air grinders fitted with or attached to constant pressure switches (paddle switch, dead man switch, kill switch). We also recommend use of an optional variable speed control or rheostat with mini die grinders.
- If the power tool has a locking switch, operate in the unlocked position.
Keep work area clean, well lit and well ventilated. No open flames. Cluttered areas and bench/work tops invite accidents.
- Keep children and visitors a safe distance from work area.
- Do not wear jewelry, loose ornaments or loose fitting garments. Unbuttoned sleeves, baggy shirts or loose fitting aprons or dresses present a hazard. Care must also be taken with long hair and beards. Any of the above can get caught in moving parts.
- Leather gloves and footwear must be worn. Cloth gloves may become frayed and are not recommended.
- Use a full face visor with dust mask.

Very Important: When not in use; before servicing; when changing accessories, remember to disconnect tool or power source. Leaving the power tool on, even temporarily, could result in accidents. Similarly, air tools should not be charged with air or left unattended when not in use.

For power carving units on stands, secure the motor at least 6 feet (180cm) above the ground.
- Follow manufacturer’s instructions for changing accessories. Refer to specific owner’s operating instructions.

TEST ONE: Plug in the power tool. While holding the tool firmly in your hand, turn on the power switch. When the power tool starts out, a slight twist from the sudden burst of speed should be felt. If a subsequent vibration that continues to shake the hand is felt, the mounting shaft inside the power unit is worn and that unit should not be used with Percival Plus.

TEST TWO: Note the cutting head (chains, discs, washers and nut) of Percival Plus comes loosely assembled. Remove all the above parts from shaft.

ASSEMBLY OF CHAINS, DISCS, WASHERS AND NUT

	Percival Plus consists of three chain assemblies (two discs secure each saw chain circlet), with the first two chain assemblies separated by a flat washer. A nut tightens over the third chain assembly securing them in place over the shaft. Refer Diagram C. We recommend this instruction be completed on a table or flat surface and that the Percival Plus mounting shaft be secured upright in a vise with the threaded end facing up during assembly.
- Place chain on bottom disc with number 25 stamped on tang facing down. Fit top disc so that the discs face each other in a convex/convex manner, Diagram C, securing the chain between the discs. The correct direction of the chain assembly is Diagram B with the tooth on the right and raker (depth gauge) on the left when looking down on the chain on a flat surface. - Minor adjustment will secure chain snugly between discs. - A double check is to ensure that the stamping rings on the inside of each disc face each other. Discs will fit flush with the inside of the chain, leaving a visible 1/8" (3mm) gap between them once the chain circlet is secured. - Fit chain and discs over threaded end of spindle until chain assembly (1) meets the shoulder of the shaft. Insure pointed hook end of the rakers (depth gage) remain pointed right. - Take a flat washer and fit it over the threaded end of spindle to rest on top disc of chain assembly (1). Assemble chain assembly (2) per steps 1, 2 and 3. Fit over the threaded end of spindle until it rests on the first flat washer. - Repeat step 5. Washer will rest on top of chain assembly (2). Assemble chain assembly (3) per steps 1, 2, and 3. Fit over the threaded end of spindle until it rests on the second flat washer. - Hand tighten the 1/4" (6mm) nyloc nut with one 7/16" (12mm) open ended box wrench or crescent (or two if the shaft has flats on the shaft) to secure the chain between the discs. If using two wrenches, place one wrench on the flats of the shaft and the other to tighten the nut. There must be no slippage of chain between discs. Note: It is not necessary to align the teeth in a straight line. They can be randomly located over the end of the threaded spindle and tightened. - Tighten the nut even if the entire convex shape is flattened or becomes concave. This will normally occur at the top disc nearest the nut and at the bottom disc nearest the shoulder of the shaft. (This will not affect the operation of the tool. When rotating the chains it is easy to reconfigure and turn the discs over for chain assembly in the convex position. In this manner, discs are reusable).
Diagram C		IMPORTANT: If assembled in reverse to motor direction, Percival Plus will not cut, leaving burn marks on work piece.

CHAIN ROTATION
In the actual cutting operation it is the first chain assembly at the nut end of the spindle that does most of the work. For this reason, chain assemblies can be rotated twice before sharpening. To rotate the chain assemblies, first remove the nut. Chain assembly number three (3) is the one closest to the nut, chain assembly number two (2) the one in the middle, and chain assembly number (1) the one closest to the shoulder of the spindle. In rotating them after first or second use, chain assembly (3) becomes chain assembly (1), chain assembly (2) becomes chain assembly (3) and chain assembly (1) becomes chain assembly (2). Tighten them up, reuse and in the next rotation before sharpening do it in the same order.
After original use and two rotations, all three chains have been worn evenly and can then be resharpened at the same time.

REGULAR INSPECTIONS
The position of the Percival Plus mounting shaft must be checked at regular intervals, no more than five (5) minutes apart. This safety check is visually done by checking to see that the base of the guard on Percival Plus is still in contact with the top of the collet or chuck. If, at any time, a slight vibration occurs or is felt in the hands, immediately stop the power tool and check to ensure that the mounting shaft has not begun to work its way out of the chuck or collet. Any space between the base of the guard and
the top edge of the chuck or collet indicates that the shaft is beginning to work its way out of the power source. If this happens more than once, after retightening the collet or chuck, it is an indication the collet or chuck on your power tool is beginning to wear. It is mandatory that the collet or chuck be checked for wear by a qualified dealer and replaced immediately and before Percival Plus is used in that power tool again.- Read and comply with safety and operating instructions published by manufacturer of power or air tool used in conjunction with Percival Plus.
- Keep work area clean, well lit and well ventilated. No open flames. Cluttered areas and benches invite accidents.
- Keep children and visitors a safe distance from work area.
- Store idle tools in dry, high or locked place out of reach of children.
- Do not overload the power unit by using excessive force when cutting. It will do the job better and safer at the rate for which it was designed.
- Do not wear jewelry, loose ornaments or loose fitting garments. Unbuttoned sleeves, baggy shirts or loose fitting aprons or dresses present a hazard. Care must also be taken with long hair and beards. Any of the above can get caught in moving parts.
- Leather gloves, especially on the free hand, and footwear are highly recommended. Cloth gloves may become frayed and are not recommended.
- Use a full face visor combined with a dust mask. Percival Plus’s cutting action may cause chips to be thrown back into operator’s face.
- Keep proper footing and balance at all times.

VERY IMPORTANT: When not in use; before servicing; when changing accessories, remember to disconnect tool or power source. Leaving the power tool on, even temporarily, could result in accidents if foot pedal to the power unit is accidently turned on or stepped on. Similarly, air tools should not be charged with air or left unattended when not in use.

- Under no circumstances should a damaged or bent spindle/shaft be straightened and reused. The part must be replaced. Refer this situation immediately to King Arthur’s Tools.
- Keep face and free hand at least 12" (30cm) from cutting head.
- Keep the work piece firmly secured in a work bench or vise. Never use free hand to hold or steady workpiece.
- Keep tools cleaned and oiled for best and safest performance.
- Follow manufacturer’s instructions for changing accessories. Refer to specific owner’s operating instructions.
- Use only extension cords suitable for outdoor use. Approved cords are marked with the suffix W-A e.g. SJTW-A or SJOW-A. Inspect cords periodically and replace when damaged.
- Do not attempt to reach underneath work piece or remove material while the tri-cutter
is turning.
- Do not operate Percival Plus while under the influence of alcohol, drugs, medication or when tired. Stay alert and use common sense.
- Do not rush.
- Guard against kickback. Release the switch immediately if the tri-cutter stalls or binds. Do not remove Percival Plus from work piece during the cutting operation while the cutting heads are moving - remove when the unit has been stopped.
- When you switch the unit off, do not bang the tri-cutter head against a work bench or work piece to bring the tool rotation to a stop.
- Do not lay the tri-cutter head down until it has stopped completely.
- Do not start Percival Plus when its cutting head is in contact with the work piece.

OPERATING INSTRUCTIONS - AIR TOOLS
- Never carry tool by the hose or yank it to disconnect from power supply.
- Keep hoses and cables from heat, oil and sharp edges.
- Check hoses and cables for weak or worn condition before each use, making certain that all connections are secure.
- Do not exceed maximum operating pressure.

PERCIVAL PLUS OPERATING INSTRUCTIONS
- Do not operate above 25,000 RPM.
- With mini die grinders check the housing on the motor for over heating on a regular basis. Percival Plus can easily work the power source beyond its capacity if not checked every 15-20 minutes. See Owners Instruction manual for respective manufacturers.
- Do not use free hand to press down on the guard or guard washer as a handle for additional leverage.
- Use a standard round 5/32" (4mm) chain saw file for sharpening teeth.
- When sharpening teeth while still connected to spindle, 1) turn power source or air off, 2) wear a leather glove to hold the teeth/discs steady and use the other hand to sharpen teeth. With normal usage, a few light strokes on each tooth will keep them sharp. Regularly check teeth and keep sharp. (Refer also to Chain Rotation section).

POWER UNITS RECOMMENDATIONS
- Important Foreword: Percival Plus is available in three models with different shaft lengths of 4" (100mm), 4-5/16" (108mm) and 6" (150mm). These important distinctions are explained below.
- The short 4? (100mm) model 42008 is specifically manufactured with a short mounting shaft suitable for the short collet length and barrel depth found on most flex shaft machines. For this reason the 4" (100mm) model 42308 is recommended for these units only. As shown below, we do not recommend any other Percival Plus models on flex shaft machines.
- The other two models have a total shaft length of 4-5/16" (108mm) (part # 42538) and 6" (150mm) (part # 62538). Significantly, both of these have a longer mounting shaft suitable to fit most air and mini die grinders which generally have a collet length of at least 1" (25mm) and a barrel depth of 1-1/4" (31.75mm). To achieve optimum safety and because Percival Plus is a powerful, heavy accessory, the safest way to achieve this is to have all of the mounting shaft inside the barrel, secured by the collet or chuck. There must be no gap between the bottom of the guard and the top of the collet/chuck. The potential for a bent shaft increases if there is any gap between them. For versatility on these power units only, we offer Percival Plus in the short and long versions.

PERCIVAL PLUS TRICUTTER
4" (100MM) MODEL 42308
- Recommended for flexible shaft machines rated up to a maximum of 25,000rpm.

Note: These 4" (100mm) models have a shorter mounting shaft than all other models. Due to the shorter collet size of flexible shaft machines, we recommend that only the above model be used for flex shaft units.

PERCIVAL PLUS TRICUTTER
(4-1/4") 108MM MODEL 42538 AND (6?) 180MM MODEL 62538
- Recommended for mini (1-1/2") electric die grinders with collet or chuck, rated between 2-4 amps, maximum 25,000rpm, and air grinders to 90psi. Electric die grinders and air grinders must have a minimum barrel depth of 1-1/4" (31.75mm). Simply put, all of the mounting shaft must fit in the "throat" of the power unit - no gap allowed!

DO NOT USE these products ON POWER UNITS OTHER THAN RECOMMENDED above, nor Craftsman rotary die grinders, routers or drills.

- Highly recommended for use only on power tools fitted with or activated by constant pressure switches (paddle switch, dead man switch, "kill" switch). If the power tool has a locking switch, operate in the unlocked position. For mini die grinders, the use of a variable speed control or rheostat is also strongly recommended. Though rated up to 25,000 rpm, Percival Plus works best between 15,000 to 20,000 rpm. This accessory is a powerful tool that could cause overheating and damage to flex shaft cables if used on an under powered unit.

FEATURES AND OPERATING TIPS
- The triple head design makes Percival Plus an aggressive wood working and carving tool as well as a finishing tool. Before attempting cuts on your work piece, test Percival Plus on a piece of scrap wood to get the feel of the cutting power by using it in different directions. With its wide head, this is the ideal tool for eliminating short, sharp ribs and ridges with extremely good control (e.g. a chain saw or any rough cuts from Lancelot and Squire, our disc grinder accessories, or any of our tandem combinations). It can be used in carving and creating different effects on large scale objects at least 5-6 feet in height, intermediate size wood pieces weighing up to 80 pounds (38-40kgs), free form bowl carving, drum making or ice carving. These are just some of many carving applications.
- The tool has less of a tendency to "walk" away from the area being cut and cuts well around corners and sharp edges without climbing over the wood. Percival Plus is an extremely controllable tool for convex surfaces, those surfaces that come out away from the wood.
- The configuration allows the teeth on the front chain assembly to get a good bite on the wood, however, some practice and control is required to avoid the difficulty of getting the first row of teeth from digging into the wood faster than you would want to. The key to a better performance in this way is to pull the tool toward you as you are cutting and to engage the last row of teeth gradually in the surface of the wood. It will require more practice in hard wood than soft wood. To remove ridges and obtain a smooth surface, position the cutters horizontally so that they all come into contact with the material. Use in a push/pull or side to side action.
- Cutting end grain. Plunge cut the head of Percival Plus into the end grain. You may at times experience the nut that holds the circlet on the shaft digging into and burning a mark in the wood. Lever Percival Plus to the left and right, up and down, gradually increasing the width and depth of the hole to the desired size. By operating it as described you will also remove the burn marks left by the bolt.
- The tri-cutter is a perfect tool for enlarging a hole or cutting a hole out of round into an ellipse, or even into a geometric shape such as a triangle, rectangle or square with rounded corners. With practice Percival Plus will produce a surface that looks like it has been sanded. For large wood removal in wall board, fiber board, plaster or similar type of building material, Percival Plus can be a good trade tool.

Manufactured in the USA by King Arthur’s Tools, U..S. Patent #5,090,287. Foreign patents awarded.