Makita’s High-Power Angle Grinder Features Variable Speed Control
The Makita 4 ½-inch SJSII high-power angle grinder features a 15-AMP motor that delivers more output and features a variable speed control dial that allows the user to adjust RPM from 2,800 to 11,500 to match the speed to the application.
The high-power angle grinder features SJSII, which uses a leaf spring and cam gear-drive mechanism that is engineered to reduce vibration for increased operator comfort during extended use. Vibration is further reduced by the vibration-absorbing side handle that provides increased comfort on the job.
An electronic controller provides constant speed control that automatically applies additional power to the motor to maintain speed under load. The controller provides soft start, designed to suppress start-up reaction for smooth start-ups and longer gear life. It provides an electronic current limiter which helps protect the motor from overload in high torque applications.
A variable speed control dial enables users to match the speed to the application. Labyrinth construction seals and protects the motor and bearings from dust and debris for longer tool life. The motor fan is designed with enlarged fins for increased air flow and a cooler running motor.
Complete zig-zag epoxy is applied to both sides of the armature coil and a powder coating for protection from debris and longer tool life. Spiral bevel gears make for smoother rotations and a more efficient transfer of energy. Fully aluminum-constructed gear housing provides for better gear alignment and smooth transmission for increased durability and comfort. The grinder has a “tool-less" wheel guard for easy adjustment, and a slide switch with lock-on for continuous use.
About the Author
Michael Roth
Editor
Michael Roth has covered the equipment rental industry full time for RER since 1989 and has served as the magazine’s editor in chief since 1994. He has nearly 30 years experience as a professional journalist. Roth has visited hundreds of rental centers and industry manufacturers, written hundreds of feature stories for RER and thousands of news stories for the magazine and its electronic newsletter RER Reports. Roth has interviewed leading executives for most of the industry’s largest rental companies and manufacturers as well as hundreds of smaller independent companies. He has visited with and reported on rental companies and manufacturers in Europe, Central America and Asia as well as Mexico, Canada and the United States. Roth was co-founder of RER Reports, the industry’s first weekly newsletter, which began as a fax newsletter in 1996, and later became an online newsletter. Roth has spoken at conventions sponsored by the American Rental Association, Associated Equipment Distributors, California Rental Association and other industry events and has spoken before industry groups in several countries. He lives and works in Los Angeles when he’s not traveling to cover industry events.