Milwaukee 6146-33, 6161-33 manual Using Grinding Wheels, Using CUT-OFF Wheels, Using Wire Brushes

Trigger Switch Operation (some models)

To start the tool, grasp the handle and side handle firmly and pull the trigger.

To stop the tool, release the trigger. Make sure the tool comes to a complete stop before laying the tool down.

To lock-onthe switch (some models), start the tool and push in the lock-on button. To stop the tool, pull and release the trigger. Make sure the tool comes to a complete stop before laying it down.

General Operation

1.If you have just installed an accessory or are beginning a period of work, test it by letting it spin for one minute before applying it to the workpiece. Out-of-balance or damaged acces- sories can mar workpiece, damage the tool, and cause stress that may cause accessory failure.

2.Use a clamp, vise or other practical means to hold your work, freeing both hands to control the tool.

3.Hold tool securely with both hands.

4.Start the tool.

Note: On some models, if the tool is plugged in when the tool switch is in the "ON" position, the tool will not run. Turn the tool off, then back on to begin work.

5.Allow accessory to come to full speed before beginning work.

6.Control pressure and surface contact between accessory and workpiece. Too much pressure slows speed.

7.When finished, turn off the tool and make sure it comes to a complete stop before laying it down.

USING GRINDING WHEELS

WARNING To reduce the risk of injury, the operator should be instructed in the use, care and protection of grinding wheels.

Grinding Wheel Selection

Use grinding wheels, and accessories that are:

•correct size as written on tool’s nameplate.

•rated at or above the RPM listed on the tool’s nameplate.

•correct accessory, wheel type and grit for the job. Grinding is the cutting action of thousands of abra- sive grains on the face of a grinding wheel. When grinding metals such as steel and iron, choose an aluminum oxide grinding wheel. Select a silicon carbide grinding wheel for stone and concrete. Use cotton reinforced wheels for non-ferrous metals.

Type 27 Reinforced 1/8" thick or less Cut-Off Wheels are suited for small cut-off and shallow notching operations only. Always handle wheels carefully to avoid damage. Before installing any wheel, always inspect it for cracks. If wheel is cracked, discard it to prevent others from using it.

Care of Grinding & Cut-Off Wheels Grinding/cut-off wheels should be protected from:

•wetness and extreme humidity

•any type of solvent

•extreme changes in temperature

•dropping and bumping

Grinding and cut-off wheels should be stored:

•in an organized way so wheels can be removed without disturbing or damaging other wheels

•with their safety information

Grinding and cut-off wheels should NOT be dropped, rolled or bumped.

Discard wheels that have been dropped, rolled, bumped, subjected to extreme changes in tem- perature, or come into contact with solvents or wetness.

Grinding

When grinding, hold tool at a 5o to 15o angle, using constant pressure for a uniform finish. Too great an angle causes concentrated pressure on small areas which may gouge or burn work surface.

Fig. 5

Hold at a 5° to 15° angle

For best result use only this portion of disc

USING CUT-OFF WHEELS

WARNING A Type "1" guard must be installed when using a cut-off wheel to provide maximum protection for the operator

if the wheel should break.

Type "1" Cut-Off Wheels are suited for small cut-off and shallow notching operations only.

When using a cut-off wheel, hold the tool as shown, using only the edge of the wheel.

Fig. 6

WARNING Using the face of a Cut-Off Wheel (as in grinding) will cause the Wheel to crack and break, resulting in serious

personal injury.

USING WIRE BRUSHES

WARNING Everyone in the area must wear protective clothing and safety goggles or face shields. Fatigued wires and residue will fly off the brush with considerable

force, causing potential for serious injury.

Wire brushes are useful for removing rust, scale, burrs, weld slag, etc.

Always install wire cup brushes according to the accessory manufacterer’s instructions.

Fig. 7

Wire Cup Brush

WARNING Because the wires on wire wheel brushes are directed towards the operator, a guard must be used to protect the

operator when fatigued wires break.

When using a wire wheel brush, install guard ac- cording to "Installing/Removing Accessories".

Fig. 8	Guard	Wire
		Wheel
		Brush

Test wheel for balance and loose or damaged wires by letting it spin for one minute before applying it to the workpiece. During this time, no one should stand in front of or in line with it.

Control pressure and surface contact between wheel and workpiece. Too much pressure causes over-bending of wires and heat build-up causing premature wire breaking, rapid dulling and reduced brush life. Instead of more pressure, try a wire wheel with more aggressive cutting action (increased wire size, decreased wire length or different brush type (knot type vs.crimped wire type).

WARNING Never exceed Maximum Safe Operating Speed of brush. Do not use a damaged brush or one that is func- tioning improperly (throwing wires, out-of- balance, etc.). These conditions increase the possibility of further brush failure and possible injury. Discard and replace damaged

brushes immediately.

USING SANDING DISCS

Sanding Disc Selection

Use sanding discs and accessories that are:

•correct size as written on tool’s nameplate.

•rated at or above the RPM listed on the tool’s nameplate.

•correct accessory, wheel type and grit for the job. Refer to the table below to select the correct type of sanding disc for your job. Generally, use 24 or 36 grit for heavy stock removal; 50, 60, or 80 grit for medium stock removal and 120 grit for finishing. Always begin with a coarse grit, using successively finer grits to obtain the desired finish. See your MILWAUKEE Electric Tool Catalog for a complete list of sanding discs.

Aluminum Oxide

For fast cutting, general purpose discs for most metal jobs. Best for cold-rolled steel, stainless steel or met- als requiring tough, fast cutting, long lasting abrasives.

Aluminum Zirconia Bi-Cut

Unique grit pattern is arranged in clusters for faster stock removal and cleaning. Ideal for removing paint from cars, boats, etc. without clogging.

Ceramic

Lasts up to 3 times longer than Aluminum Oxide Discs. For general metal working. Ideal for tough jobs.

Installing Backing Pad and Sanding Discs

1.Unplug the tool.

2.Wipe the accessories, disc nut and spindle to remove dust and debris. Inspect the parts for damage. Replace if needed.

3.Slip backing pad onto spindle with flat side away from gear case.

Fig. 9

Disc nut

Sanding disc

Backing pad

Spindle

4.Place sanding disc on backing pad and secure assembly to spindle with disc nut.

5.To tighten, press the spindle lock button while turning disc nut clockwise with the spanner wrench provided.

6.To remove backing pad and sanding disc, unplug the tool and reverse the procedure.

8 9