Starlet Grinder G-5 Manual

Starlet Grinder G-5 Manual

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You are now the owner of a Glastar Grinder - the world's best selling glass Grinder. It will make your stained glass work much more enjoyable.

This grinder is double insulated and does not require a grounded receptacle. NEVERTHELESS, ALWAYS UNPLUG YOUR MACHINE BEFORE CLEANING IT OR MAKING ANY REPAIRS. (Note: We strongly recommend that you return the unit to the factory for any repair.)

When operating the grinder, always protect yourself against eye injuries from flying glass. Either wear safety glasses or use the glastar eye shield that mounts over the grinder's cutting head. Many users prefer the eye shield because it eliminates glass chips flying toward the face. It is available from your dealer as an option.
In this carton, along with the Grinder, you will find two additional items: A plastic splash guard, which is to be installed on the top plate behind the cutting head. Also, there is an extra sponge inserted in the bottom of the Grinder. Store it in this space until the sponge that is on top of the machine wears out.

To operate the Grinder, you need only add water. Remove the top plate and add just enough water, about 1 1/2 cups, so the water level is above the bottom of the skirt. It is not necessary to completely fill the reservoir. Then, dip the sponge in water and squeeze it several times to make certain it is thoroughly wet. Replace the sponge in its pocket behind the cutting head, and turn on the Grinder. As the cutting head turns, water is pumped into the sponge by the skirt, keeping it soaking wet. The wet sponge keeps the diamond surface of the cutting head clean and cool. Never use the machine without first checking the water level and making certain the sponge is in place behind the cutting head. If you use the diamond cutting head without adequate water, you will considerably shorten its life.

The cutting head slings water as it rotates. The splash guard catches most of this water and returns it to the reservoir.

When you start to grind, push the glass against the cutting head with firm, even pressure. The diamond surface cuts better with firm pressure against it. Excessive pressure will not hurt the diamond surface, although it may slow or stop the motor. If this happens, don't be concerned. Just back the glass off slightly...and the motor will resume its normal speed.

Some manufacturers suggest the use of an industrial coolant to protect the diamond head. Glastar does not recommend or discourage the application of a coolant. Coolants may prolong the life of the Glastar diamond head by 10%, but their costs far outweigh the money saved in head replacement. In addition, coolants create a mess.

If your finger touches the diamond cutting head when it is rotating, it will feel smooth. The diamond surface is not nearly the hazard to fingers as is a belt sander or a silicone carbide grinding wheel.


The diamond cutting head extends slightly more than 1/4" above the work surface. If all the glass you grind is 1/8" thick or less, you will only use the lower 1/2 of the diamond cutting head. When the diamond cutting surface dulls, then the head should be turned over. This will provide two grinding surfaces; each surface should last approximately 30 to 60 hours for a total of 60 to 120 hours per grinding head.

It is difficult to quote a specific number of hours that the diamond cutting head will last. Like sandpaper, it does not wear out all of a sudden. Instead, the cutting head gradually begins to dull. The head's durability depends on the type of glass you are grinding and your definition of dull. The 30 to 60 hours per surface is an estimate. We do not guarantee its life for any period of time due to the many ways it may be used.

Never grind any metal with the diamond cutting head. This will make the diamond surface unusable for glass in a matter of seconds.

To replace or turn over the cutting head on your Starlet, depress the white button on the back of the machine, and at the same time, slowly revolve the grinding head until the button engages and locks the motor shaft so it cannot rotate. Use a Phillips head screw driver to loosen and remove the screw and the brass washer in the center of the head. Release the white button, take the grinding head off the motor shaft, turn it upside down, and put it back on the spindle. Put the brass washer back on the head, lock the motor shaft and tighten the screw.

Ask your dealer about the 1/4" grinding head.

The grinder's only moving part is the electric motor which has permanently lubricated bearings. No maintenance is required, but you should periodically clean the top of the machine.

After using the Grinder for a short period, you will find that a very fine white paste, made up of glass particles, collects at the bottom of the reservoir. This glass will also collect in the sponge and will eventually inhibit the movement of water. Therefore, after every hour of use, remove the sponge, hold it under a water faucet, and squeeze it several times to rinse it clean. Every four hours of use, clean the reservoir of ground glass.

To clean the reservoir, unplug the machine and remove the white plastic work table by lifting it straight up. Tip the Grinder on its side next to the sink and sponge out the reservoir to remove the glass paste. Fill the reservoir with water and you are ready to grind glass again. No other maintenance is required.

The finely-ground glass that collects on the white plastic work table can scratch smooth, soft glass, such as 3/16" (4.7625 mm) or 1/4" (6.35 mm) plate, and some antique glasses. If you are working with soft glass, frequently remove the white work table and rinse it off. To be absolutely certain that you do not scratch the glass, place several strips of masking tape on the bottom of the glass to raise it off the table.

If you use a paper pattern when grinding the glass, water from the cutting head will get it quite wet. If you intend to make two projects from one set of patterns, let the paper dry out before attempting to grind the second set. After the paper dries, it will resemble its original shape and size. However, the paper patterns do shrink after getting wet several times.

For instance, if you are working on a Worden lamp, where the same set of patterns is used six times, Glastar recommends making a second set of patterns. Use each one only three times. Better yet, make original patterns from a sheet of acetate or mylar. Unaffected by water, these sheets can be used over and over again.


Model G5
This machine operates on standard household current (115 volts, 60 cycles, single phase, ac). The power consumption is 1.6 amps at full load.

Model G51
This machine operates on standard household current (220/240 volts, 50/60 hz, single phase, ac). The power consumption is 0.8 amps.