6
* Do not grind on the side of abrasive cut-off wheels. Side forces applied to these
wheels may cause them to shatter.
Causes and Operator Prevention of Recoil
Recoil
is a reaction that may feel a like the wheel is trying to skip out of, or climb
over, the material being cut. Recoil is a sudden reaction to a pinched, bound or
misaligned rotating wheel. The wheel may stall and cause an uncontrolled machine
to back out of the kerf toward the operator when the tool is moved in the “fire
forward” position. If the tool is moved in the “reverse fire” position, the machine
may tend to walk away from the operator.
If an abrasive wheel or diamond wheel becomes twisted or misaligned in the cut, the
side of the wheel that is entering into the material can dig into the top surface of the
material causing the wheel to climb out or recoil out of the kerf either toward or
away from the operator, depending on the fire forward or reverse
fire orientation.
Abrasive wheels may also shatter under these conditions causing pieces or fragments
to strike or impale the operator and bystanders. Recoil or shattered wheels are the
result of tool misuse and/or incorrect operating procedures or conditions and can be
avoided by taking proper precautions as given below:
* Maintain a firm grip with both hands on the machine handle and position your
body and arm to allow you to resist recoil forces. Recoil forces can be
controlled by the operator, if proper precautions are taken.
* When wheel is binding, or when interrupting a cut for any reason, turn off tool
and hold the machine motionless in the material until the wheel comes to a
complete stop. Never attempt to remove the machine from the work while the
wheel is in motion or recoil may occur. Investigate and take corrective action to
eliminate the cause of wheel binding.
* When restarting a machine in a workpiece, center the wheel in the kerf and
check that the sides of the wheel are not engaged into the material. If wheel is
binding, it may walk up or recoil from the workpiece as the machine is restarted.
* Support large panels to minimize the risk of wheel pinching and recoil. Large
panels tend to sag under their own weight. Supports must be placed under the
panel on both sides, near the line of cut and near the edge of the panel.
* Wheel guard footplate must be tight and secure before making a cut. If depth
adjustment shifts while cutting, it may cause binding and recoil. Using the
machine with an excessive depth of cut setting increases loading on the unit
susceptible to twisting of the wheel in the kerf. It also increases the surface area of
the wheel available for pinching under wheel twisting conditions or misalignment.
* Use extra caution when making a “Pocket Cut” into existing walls or other
blind areas. The protruding wheel may cut objects that can cause recoil.
7
Additional Safety Rules for Roto Zip Tool Corporation’s
4” See-Thru Back-up Pads and Zip Discs
Roto Zip’s Zip Discs and Back-up Pads are manufactured using the E-ZView technology by Norton Company.
Patent pending AVOS® technology.
* Always wear eye protection and a dust mask for dusty applications and when
sanding overhead. Sanding particles can be absorbed by your eyes and inhaled
easily and may cause health complications. See ANSI Standard Z87.1. (ANSI is
the American National Standards Institute.)
* All Zip Discs must be used in conjunction with the designated Roto Zip Tool
Corporation Back-up Pad.
* The tool manufacturer’s safety guarding must be used.
* Do not start equipment with any object protruding through the scooped holes in
the product. Do not grind near an edge, corner or protection that can snag the
edge of the disc. Do not store or rest the tool on the disc or pad. If tool is
dropped on pad or disc, replace pad or disc before using.
* Do not stick objects in the scooped holes while mounting or in use.
* Never use disc with nicks, cuts, and tears at the edge or in the holes.
* Never use any other design of disc in conjunction with the Roto Zip Tool
Corporation Back-up Pad.
* Never use adhesives to fasten abrasive discs to back-up pads. Abrasive discs
and back-up pad must always be secured by Roto Zip Tool Corporation’s specially
designed triangular lock nut.
* Never use another disc as a back-up pad.
* Never use any other design of back-up pad in conjunction with Zip Discs.
* Never use discs with water.
* Only use Zip Discs designed to work in conjunction with See-Thru Back-up Pads.
* Store in clean, protected area at 35-50% relative humidity and 60-80˚
