RECOMMENDATION CHARTS
Hard Jointing Stones
|
Materials
Being Jointed at 3, 600rpm
|
Type
of Joint
|
Abrasive
Materials
|
Grit
|
||
|
Planing
|
Profiling
|
Silcon
Carbide
|
Aluminum
Oxide |
||
| HSS |
X
|
X
|
X
|
80-220
|
|
| HSS |
X
|
X
|
220-400
|
||
| Carbide Tipped |
X
|
X
|
220-400
|
||
| Carbide Tipped |
X
|
X
|
220-400
|
||
| Carbide Sandwich |
X
|
X
|
220-400
|
||
| Carbide Sandwich |
X
|
X
|
X
|
220-400
|
|
Soft Jointing Stones
|
Materials
Being Jointed
at 6, 600rpm
|
Type
of Joint
|
Abrasive
Materials
|
Grit
|
||
|
Planing
|
Profiling
|
Silcon
Carbide
|
Aluminum
Oxide |
||
| HSS |
X
|
X
|
X
|
280-600
|
|
| HSS |
X
|
X
|
500-600
|
||
| Carbide Tipped |
X
|
X
|
220-400
|
||
| Carbide Tipped |
X
|
X
|
150-220
|
||
| Carbide Sandwich |
X
|
X
|
220-400
|
||
| Carbide Sandwich |
X
|
X
|
X
|
150-600
|
|
Jointing Stone Recommendation Chart
| Traditionally, Hard Jointing stones (Coarser 80 to 240 grit) are used on 3,600 rpm machines. Soft jointer stones (Finer 280 to 600 grit) are used on 6,000 rpm machines. | |
| Grit Size: | Finer grits (higher number) produce better finish quality. Coarse grit stones will joint up faster and have a longer life. |
| Bonds: | Resin-better
finish, will not hold a form as long. Vetrified - cooler cuts, better for holding qualities than Resin. |
| Abrasive Materials: | Green Silicon Carbide: Cuts cooler and faster than Black Silicon Carbide. |
| Black Silicon Carbide: Smoother finish, longer life. | |
| Aluminum Oxide: Pure White Cuts fast and cool, best for Straight Joints on Planers. | |
| NOTE: Grinding accuracy is critical in determining proper jointing stone selection. | |
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