Product Details

Glastar (B4) 8" Diamond Disc Grinder with Magnetic Holder

Glastar (B4) 8" Diamond Disc Grinder with Magnetic Holder
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Glastar Diamond Disc Grinder (Model B4) features an 8" grinding surface and a 1/3 HP industrial quality motor. Available as a fixed speed or a variable speed machine. For Hand-Beveling, Cold-Glass Working and Lapidary, grinding discs are the faster way to grind and polish your projects. Diamond grinding is the fastest and most economical way to grind glass or stone. Because it is so much faster than any other method, it pays for itself in a very short time.

Now, it is possible to grind and polish all on one machine and change media in 2 or 3 seconds.

If the B4 is the only grinder in your shop, it should be as versatile as possible. With the variable speed motor, lapidary shops can take advantage of the different speeds for different materials.
The B4’s Key Features are:

  • Variable vs. Fixed Speed: A fixed-speed machine, is set at 1625 RPM, while a variable speed version is adjustable from 1725 RPM to zero by just turning a knob. If the machine is going into a production shop and will be used for only a single purpose, a fixed-speed model is probably the best choice.
  • Grit Size: For rough grinding, an 80 or 100 grit is most popular and for smoothing a 400 or 600 grit. The 100 and 400 are the most popular combination. Prepolish and final polish pads are also available from Glastar which makes this machine a complete beveling station
  •  Motor: The B4 is designed for production. The motor choices are the very best available. The fixed-speed motor is a Fasco 1/3HP and the variable-speed motor is a RAE 1/3HP. The electronic speed control has current limiting to protect the motor and control. The base plate is 3/16" thick stee. Every aspect of this grinder is over-designed to create a machine that will last and be trouble-free
  • Magnetic Disc Holder: Grinding discs are held in place magnetically. This unique mounting arangement allows use of the total grinding surface without being concerned about the work piece striking a mounting screw. It takes only 2 or 3 seconds to change the discs.
  • Motors: Both 1/3HP motors are "industrial" quality, and the variable-speed is a permanent-magnet motor
  • Splash Guard: This removable rubber guard completely eliminates spray. Clips are provided to retract the guard at two points so that long pieces can be ground
  • Coolant: For applying coolant, there is an adjustable gooseneck, valve and 1/4" compression fitting. This flexible gooseneck makes it very easy to direct a heavy stream of coolant to any area of the disc. There is also an 8' x 5/8" drain line included
  • Housing: This 3/16" thic, molded polyethylene part is an exceptionally tough material which will not rust
  • Base: A 3/16" thick steel plate forms the base to which everything is mounted
  • Speed Control: The electronic control for the variable speed motor produces a constant torque and includes current limiting to protect both the motor and the control. By changing the dial, the shaft speed is continuously variable between 0 and 1725 RPM
  • Pump Receptacle: The on/off switch in the front energizes both the motor and this receptacle. Therefore, when the machine is turned on or off, the coolant pump is as well
  • Glastar stocks a very large choice of diamond discs and polishing pads. Create the combination that works best for your needs.
  • An  industrial pump is available so that coolant can be recirculated over the diamonds which will improve life by 10-15%.
Included as part of the B4RV Studio Beveling System(see item# GLA-B4RV)

NOTE: These machines are assembled upon order and ship directly from the manufacturer; please allow 2-3 weeks for delivery

Base construction 3/16" steel plate
Body construction 3/16" molded polyethylene
Drive shaft: mounting magnetic hub with 1/2" centering pin
Drive shaft rotation: counter clockwise
Drive shaft: type direct drive
Electrical 115V-50Hz or 230V-60Hz
Motor: current @ 115V 3.6A
Motor: current @ 230V 1.8A
Motor: power 1/3 hp
Motor: type permanent split capacitor
Motor: bearings sealed ball bearings
Motor manufacturer Fasco
Speed at 50Hz 1350 rpm
Speed at 60Hz 1625 rpm
Breakdown torque 26 oz.-ft.
Motor: current @ 115V or 230V 1.25A
Motor: power 1/3 hp
Motor: type permanent magnet electronically controlled
Motor: bearings sealed ball bearings
Motor manufacturer RAE
Speed at 50Hz or 60Hz 0 to 1725 rpm
Torque @ 1250 rpm 23 oz.-ft.
Grinder style disk
Disk size 8" diameter
Overall size 13" X 15-1/4 "X 9-1/2" high including plumbing
Weight 35 lbs
Manufacturer Glastar Corporation
Glastar Product # P33367 Fixed Speed
Glastar Product # P33369 Variable Speed
Glastar Model # B4
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406 Interstate Ct
Sarasota, FL 34240
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