Diamond wheel grit application

Grinding carbide

1. Heavy stock removal with a pellet face 6A2
grinding wheel

Cemented tungsten carbide
Dimensions = 
12 x 12 mm per component

Machine  = Viotto HOV1HD
Wheel speed  = 23 m/s
Wheel size  = Ø 350 x 75 mm
Depth of cut  = 0.3 mm/pass

PDA 321 N30
US Mesh = 120/140
Resin bond pellets
50 concentration
Dimensions =
Ø 9.6 x 3 mm

Production rate is 3000 pieces per hour. The 415 pellets account for 50% of the total grinding wheel face area

2. Finishing the faces of wire rolling rings

Cemented tungsten carbide
Ø 1000 HV 30

Machine  = Jung Rundtisch
Wheel size  = Ø 200 x 12 x 4 mm
Depth of cut = 0.05 mm/stroke

PDA 321 N55
US Mesh = 80/100
Resin bond
75 concentration

Cemented tungsten carbide outperforms steel or cast iron rolls by a factor between
10 to 25
Surface finish = 0.3-1.0 µm Ra

3. Grinding the flanks and backs of circular saw teeth

Cemented tungsten carbide

Machine  = Auto swing frame
Wheel speed  = 17 - 18 m/s
Stroke rate = 60 - 120/min
Feed rate  = 3 - 5 mm/s
Cycle time  = 12 - 15 Sec/tooth

PDA 321 N55
US Mesh = 270/325
Resin bond
75 concentration

Dedicated grinding machines and wheels have improved the cost-effectiveness of this grinding operation

4. Slot and internal grinding of cylindrical parts

Green silicon carbide
(REFEL)

Machine  = Henri Hauser 3SM
Wheel speed  = 16000 rpm
Wheel size  = Ø 38 x 4 mm
Depth of cut  = 0.13 mm/pass

PDA 321 N55
US Mesh = 100/120
Resin bond
100 concentration

High dimensional accuracy and surface finish is achieved with no significant wheel edge loss

Glass

5. Edge grinding of laminated glass facia panels

Laminated glass
Thickness =
1 - 12 mm
Machine  = Powergrind 027-PE
Spindle speed  = 2850 rpm
Machine motor   = 1 kW

PDA 989
US Mesh = 120/140
Metal bond
40 concentration
Powergrind machine will grind the edges on a 1.5 x 1.2 m sheet in 10 minutes as a one man operation

6. Manual shape bevelling and edging of curved edge glass

Flat glass
Dimensions =
Ø 2.7 m max.
Machine = Suvisa FBP/OC
Wheel speed  = 1400 rpm
Wheel size  = Ø 150 mm
Bevel angle = 5° - 15°

PDA 665
US Mesh = 170/200
Metal bond
75 concentration
Grinding bevels between 12 and 38 mm on a regular basis gives a wheel life of approximately 6 months

7. Edge finishing of glass panels

Glass sheets
Dimensions =
1.220  x 1.830 m

Operation = 3 stage edge bevel
Wheel speed  = 3600 rpm
Wheel size  = Ø 100 x 10 mm   Bevel width = 9.5 - 12.5 mm

PDA 989
US Mesh = 80/100
Bronze bond
35 concentration
Edges of 5 mm thick glass sheets 1.2 m x 1.8 m can be bevelled at a rate of 2.5 m per minute. Wheel life of approximately 200 working hours

8 Processing glass rods for necklace bead jewellery

Coloured glass rods
Dimensions = 1.2 m
(variable diameter)
Machine  = Shei Da Auto M/C
Wheel speed  = 16.6 m/s
Wheel size  = Ø 150 x 120 mm
Material removed = 4 mm/bead

PDA 989
US Mesh = 80/100
Electroplated bond

20,000 glass rods are processed per day. Wheel life equates to grinding 600 kg of glass