Ryobi BGH827 - Manual (Page 10)

10 – English
WARNING:
Do not allow familiarity with tools to make you care-
less. Remember that a careless fraction of a second is
sufficient to inflict serious injury.
WARNING:
Always wear eye protection with side shields marked to
comply with ANSI Z87.1. Failure to do so could result in
objects being thrown into your eyes resulting in possible
serious injury.
WARNING:
Do not use any attachments or accessories not
recommended by the manufacturer of this tool. The use
of attachments or accessories not recommended can
result in serious personal injury.
APPLICATIONS
This product has been designed only for the purposes
listed below:

Sharpening drill bits
 Sharpening lawn mower blades
 Sharpening chisels and flat screwdrivers
BASIC OPERATION
To be efficient and work as designed, your tools should be
kept sharp. Dull tools can and will cause accidents.
Bench Grinders are ideal for sharpening tools such as
chisels, planer blades, scissors, etc., and for removing rust
or corrosion.
WARNING:
Never sharpen or grind anything made of aluminum,
brass, or copper.
Grinders remove material rapidly so pressure is the key to
efficient grinding.
The proper way to sharpen a tool and avoid overheating is:

Keep the object in constant motion, moving it at an even
pace.
 Never force a tool against the grinding wheel.
 Keep the tool cool by using either the coolant tray or a
pan of water.
 The grinding wheel should rotate “into” the object being
sharpened.
OPERATION
NOTE: Excessive pressure may damage the tool, cause the
motor to overheat, and prematurely wear down the grinding
wheel.
WARNING:
Excessive pressure on a cold wheel may cause the wheel
to crack.
USING COOLANT TRAY
See Figure 8, page 13.
The built-in coolant tray allows you to cool overheated work-
pieces. Simply pull out the tray and fill half way with water
or appropriate coolant.
ON/OFF SWITCH
See Figure 8, page 13.
The Bench Grinder features a front access On/Off switch for
convenience and safety.
SHARPENING TWIST DRILL BITS
See Figure 9, page 14.
Drill bits are best sharpened on a sharpening jig (available at
most hardware stores). Begin on one side of the point at the
existing angle, then twist the bit while maintaining contact
with the grinding surface. Sharpen only the tip.
This technique requires considerable practice, so take your
time and make a few “dry runs” first with the grinder off. Be
sure to maintain the original cutting edge angle as this is
important to the efficiency of your bits. One work rest has a
V-groove angled to fit most drill bits.
SHARPENING LAWN MOWER BLADES
See Figure 10, page 14.
Lawn mower blades are usually sharpened on only one
edge and dressed up slightly on the other. Perform this
sharpening process on both cutting ends of the blade.
After sharpening, be sure to balance the blade by removing
additional material.
CAUTION:
An unbalanced lawn mower blade may cause excessive
vibration which will damage the lawn mower.
SHARPENING CHISELS AND SCREWDRIVER
BLADES
See Figure 11, page 14.
When sharpening chisels and screwdrivers, work rest should
support the chisel at the correct angle against the wheel.