All Star Grinder G-8 Manual

All Star Grinder G-8 Manual

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The power cord of this machine is equipped with a three-prong (grounding) plug which mates with a standard three-prong (grounding) wall receptacle to minimize the possibility of electric shock hazard. Where a standard two-prong wall receptacle is encountered, it is the personal responsibility and obligation of the customer to have it replaced with a properly grounded three-prong wall receptacle. DO NOT, UNDER ANY CIRCUMSTANCES, CUT OR REMOVE THE THIRD (GROUNDING) PRONG FROM THE POWER CORD.

Always unplug your machine before cleaning or making any repairs-(NOTE: We strongly recommend that you return the unit to the factory for repair.) USE ONLY IDENTICAL REPLACEMENT PARTS TO REPAIR THIS MACHINE.


OUTSIDE USA: (818) 341-0301
INSIDE USA: (800) 423-5635
FAX: (818) 998-2078

EYE PROTECTION When operating the grinder, always protect yourself against eye injuries from flying glass. Install the glass eye shield that is furnished with this machine (see instructions below). The eye shield is preferable to glasses because it eliminates glass chips flying toward the face.

Openings in the grinder back and bottom are provided for ventilation. To ensure reliable operation and to protect the grinder from overheating, these openings must not be blocked or covered. Do not place the grinder near or over a radiator or heating vent. If this unit is installed within another enclosure, be sure that adequate ventilation has been provided.


  1. Owners manual
  2. Warranty card (please mail
    this back right away)
  3. Basic grinder, including:
    1. Water Pump
    2. Top plate
    3. 1' (25.4mm) grinding head
  4. Flexible drain stopper
  5. Flexible splash guard
  6. One-inch sponge and one spare
  7. Allen key
  8. Brass alignment collar
  9. 1/4' (6.35mm) grinding head
  1. Eyeshield:
    1. Stanchion
    2. 8' x 9' (20.32 cm x 22.86 cm)
      piece of double-strength glass
    3. Two #12 x 3/4' (5.2 mm x 19.05 mm)
      screws & washers
  2. Mini table
  3. Straight edge guide
    1. Body
    2. Five nylon rollers
    3. Two #12 x 1' (5.2 mm x 25.4 mm) screws
      & two washers




  1. Remove the top plate (main work surface) by lifting straight up at each of the corners in turn.
  2. Install the flexible stopper in the drain hole located in the left front corner of the water basin. Make certain it is pushed in hard.
  3. Replace the top plate and push straight down on it at the corners to snap it back in place.
  4. Install the flexible splash guard on the peg directly behind the grinding ring.
  5. Place the brass alignment collar on the motor shaft so that the skirt on the collar comes down over the shaft.
  6. Screw the 1/4' (6.35 mm) head into the motor shaft through the alignment collar. It is only necessary to tighten the head finger tight.
  7. Mount the eye shield stanchion in the position shown in the drawing using the 3/4' (19.05 mm) screw and washers.
  8. Insert the glass into the eye shield stanchion. When you become more familiar with the grinder, you should smooth the edges of the glass on the grinder.
  9. Add water to the water basin; start with at least 32 ounces (2 pints) [.946 L]. If you add more than 48 ounces (3 pints) [1.419 L], the basin will overflow.
  10. Moisten a sponge and insert it into the open area between the grinding head and the splash guard. The sponge should be pushed into the opening far enough so that the top of the sponge is just slightly above the work surface.


You are now ready to grind glass. When you turn your grinder on, the pump circulates the water in the basin and keeps the sponge soaking wet. The wet sponge keeps the diamond surface clean and cool. Never use the machine without first checking the water level and making certain the sponge is in place behind the grinding head. If you notice a white paste or powder buildup on the piece of glass you are grinding, the sponge is not keeping the head wet enough. You should adjust the sponge by raising it a little, or you may have to add more water to the machine. If you use the diamond grinding head dry, you will considerably shorten its life.

Grinder coolant should prolong the life of the diamond head. A solution of 1 part coolant to 64 parts water or 1 tablespoon to 2 cups of water is recommended.

When you start to grind, push the glass against the grinding head with firm 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.

If you have to make a deep cut into the glass in one specific area, it is best to use intermittent pressure. By using this technique, you will allow the sponge to clean the glass residue from the diamond so that it cuts more efficiently.

If your finger touches the diamond 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 silicon carbide grinding wheel.

The diamond cutting surface of the head is 5/8' (15.875 mm) high. Glastar has installed the head so that the full 5/8' (15.875 mm) of diamond extends above the work surface. If all the glass you grind is 1/8' (3.175 mm) thick or less, you will only use the lower one-fifth of the cutting surface. When the diamond cutting surface dulls, lower the head 1/8' (3.175 mm). This will provide a new, sharp grinding surface. When that area dulls, lower the head another 1/8' (3.175 mm) and so forth. This will allow five surfaces; each surface should last approximately 25 to 75 hours, a total of 125 to 375 hours of grinding from one 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 25 to 75 hours per surface is an estimate. Some claim more than 100 hours per surface, while others change to a fresh surface after 10 hours. Of course, you should expect far less life if you are grinding rocks.

Never grind any metals (i.e. lead, copper) with the diamond head. This will make the diamond surface unusable for glass in a matter of seconds.

To lower the 1' (25.4 mm) head, loosen the set screw near the top of the head with the Allen key. It will slide up and down on the motor shaft with ease. Each time you re-position the cutting head, Glastar recommends the application of a lubricant, such as Vaseline, to the motor shaft. When re-tightening the set screw with the Allen key, make certain the screw is set against the flat side of the motor shaft.

The small 1/4' (6.35 mm) head allows you to grind very tight inside curves that you otherwise could not get to use the main 1' (25.4 mm) head. The 1/4' (6.35 mm) head has one additional feature. It can be used to drill holes in glass. Hold your piece of glass at approximately a 45 ° angle to the work surface as shown. If the hole you are drilling is situated close enough to the edge of the glass so that the mini table does not have to be removed, there will be an adequate supply of water from the pump. If you must remove the mini table, use a squeeze bottle to keep the head wet.


Your dealer carries three other heads as optional equipment for your grinder.

  1. The extra-fine grit head: If you find that the chipping created by the standard head (now on your machine) is excessive, you may want to use the fine grit. This head virtually eliminates all chipping, but because of its smooth surface, it grinds glass much slower than the standard head. All Glastar heads come in both standard and extra-fine grit.
  2. The extra-fast grinding head: If you are using your G8 for heavy production, you may obtain a 60 grit 1' (25.4 mm) diamond head. It is more expensive than the standard head, but it grinds much faster.
  3. The 1/8' (3.175 mm) head: It is used in place of the 1/4' (6.35 mm) head for very tight inside curves. It may also be used to drill holes.


The mini table provides a work surface on which to rest your glass when grinding with the 1/4' (6.35 mm) head. The tube extending from the underside of the table fits into the hole in the top plate directly behind the splash guard. Push it down until the four pegs that protrude from the skirt around the table fit into the four-round holes in the main work surface. As soon as the table is fully seated, water will flow from the hole under the valve handle and stream onto the 1/4' (6.35 mm) head. The valve must be turned fully to the right. If you do not want water on this head, turn the handle all the way to the left.

If you do not have water flow, the table is not seated sufficiently or the water level in the basin is too low. There must be 28 ounces (.83 L) of water in the basin before the water pump will operate. This is approximately two-thirds full. When you are through with the 1/4' (6.35 mm) head, lift the mini table off the top plate. The water pump is automatically disconnected.


This accessory permits one to grind straight-sided rectangles to exact size. The glass is pushed between the guide and the grinding head. It operates exactly like a fence on a table saw.

To install the guide, turn it upside down and load the five nylon rollers onto the pegs on the guide. Place a piece of paper on top of the rollers. Then turn the guide (paper and all) right side up onto the top plate. Slide the paper out from between the guide and the work surface. Move the guide so that the rollers face the grinding head and it is centered right to left.

Set the guide at the distance from the head you desire. Put the 1' (25.4 mm x 5.22 mm) #12 screws with washers into holes 'B' in the guide and screw them into the available holes in the top plate. BE CAREFUL: Do not over-tighten the screws. It takes very little tension to hold the guide in place.

Push the glass from right to left ONLY. The arrow on the guide indicates the direction of the glass. You may grind pieces up to 6' (15.24 cm) in width.


The drawer provides quick access for all those items needed when operating the grinder, such as extra grinding heads, Allen key, sponges, a straight edge guide, etc.


The grinder's only moving part is the electric motor which has permanently lubricated bearings. No maintenance is required.

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 surface. Move the left front corner of the grinder over the edge of your workbench. Place an empty container under the drain hole and unplug the stopper in the basin. After all of the water has drained out, use a damp sponge to remove the white paste from the reservoir. Do not tip the grinder. BEWARE: If you turn the grinder on its side, you may get water in the motor.

Don't forget to replace the stopper before refilling your machine.


Despite the grid-type of work surface, some finely-ground glass may stick to the top plate, and it 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, it would be wise to 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, 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 G8
This machine operates on standard household current (115 volts, 60 cycles, single phase, ac). The power consumption is 1.3 amps.

Model G81
This machine operates on standard household current (220/240 volts, 50/60 Hz, single-phase, ac). The power consumption is .6 amps.


This warranty is extended by GLASTAR CORPORATION to the original purchaser and to any succeeding owner. If your GLASTAR GRINDER fails for any reason within the first 5 years from the date of manufacture, we will repair the product without charge for parts or labor.

To register for this product, click here

If you have any problem with your GLASTAR GRINDER call the GLASTAR TOLL FREE NUMBER for an authorization number. Then pack the machine well and return it post-paid to GLASTAR. We will repair your grinder as rapidly as possible and return it to you post-paid.

This warranty does not cover wear of the top plate (work surface) or the diamond grinding surface.