It is useful to have some guide to the proper size of the diamond to be used when truing and dressing different size and types of abrasive grinding wheels. Selecting a diamond of the right carat weight and grade is important in order to keep the grinding costs down and also to achieve the optimum results. Use of a too large diamond is wasteful and on the other hand use of too small diamond results into rapid wear out.
For selection of most economical size and grade of diamond, the factors to be considered, diameter width, grit, grade, bond and type of abrasive wheel. A chart tabulated below from long experience of machine shop production work under average conditions to assist in selecting the right carat weight and grade of single point diamond dressers:
| Abrasive Wheel Size | Thickness of the Wheel | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 12 | 25 | 25 | 50 | 50 | 75 | 75 | 100 | 100 & Above | |
| Wheel Diameter | Carat wt. of the Dresser | ||||||||
| 100 to 150 | 0.25 | 0.35 | 0.50 | ||||||
| 150 to 200 | 0.50 | 0.50 | 0.75 | 0.75 | 1.00 | ||||
| 200 to 250 | 0.75 | 0.75 | 1.00 | 1.00 | 1.50 | ||||
| 250 to 300 | 1.00 | 1.50 | 1.50 | 2.00 | 2.00 | 2.50 | 2.50 | ||
| 300 to 450 | 1.50 | 2.00 | 2.00 | 2.50 | 2.50 | 3.00 | 3.00 | ||
| 450 to 600 | 2.50 | 2.50 | 3.00 | 3.00 | 3.50 | 3.50 | |||
| 600 to 750 | 3.00 | 3.00 | 3.50 | 3.50 | 4.00 | 4.00 | |||
| 750 to 900 | 3.50 | 4.00 | 4.00 | 4.50 | 4.50 | ||||
| 900 to 1050 | 4.00 | 4.50 | 4.50 | 5.00 | 5.00 | ||||
| 1050 to 1200 | 5.00 | 5.00 | 5.00 | 5.00 & Above | |||||
*Note: This table is only for guidance of the user and not to be taken as a rule.
Diamond powder is graded mechanically by sieves into mesh and then chemically into micron sizes. Calibration of mesh is by the number of holes the sieve has per linear inch. One micron is roughly measured to be one part in 25,000 of an inch.
| APPLICATION | GERMAN EQUIVALENTS | MICRON SIZE | MESH SIZE | HIPOL PASTE/POWDER | |
|---|---|---|---|---|---|
| PRODUCT SPECIFICATION | PASTE COLOR CODE | ||||
| IMAGE REFLECTIVE FINISH Polish on Hard Metals/Gems | D-0.7 | 0.5/1 | 50000 / 25000 | HP | White |
| SUPER FINISH Polish on Mettalographic Specimen | D-1 | 1/2 | 25000 / 10000 | HP | Green |
| FINESH HIGH FINISH Polish on Carbide, Steel, Ruby, Sapphire and Plastic Moulds | D-3 | 2/5 | 10000 / 5000 | HP | Yellow |
| INTERMEDIATE FAST Polish on Steel, Carbide, etc. Best general-purpose polishing. | D-7 | 5/10 | 5000 / 1500 | HP | Orange |
| Removal of lines, PRE-Polish on Steel and Lapping of Carbide | D-15 | 10/20 | 1500 / 650 | HP | Blue |
| LIGHT CUTTING, Fast Lapping on Steel, Carbide with good finish. | D-30 | 20/40 | 650 / 350 | HP | Red |
| Fast Stock removal MEDIUM CUTTING, Deep Scratches, Waves, Pre-Polishing on Carbide and Steel Moulds | D-50 | 40/60 | 350 / 250 | HP | Purple |
Study the application Chart and Order.
HIPOL Paste: When a paste is required for intermediate and best general purpose polishing - HIPOL-7 can be selected. HIPOL pastes are available in HIGH(H), MEDIUM(M), and LOW(L) concentration packed in 5cc syringes.
HIPOL Powder: If the above is required in powder form, same can be obtained in 5cts or 10cts packets.
| TYPES OF ROCKS | WATERWAYS | STONE SIZE (In s.p.c) | FORMATION |
|---|---|---|---|
| Very Soft | Deep | 6/10 | Massive unbroken like chalk, gypsum, fire clay, etc. |
| Soft | Deep | 10/15 | Coarse-grained, like shale, sandstone, coal. |
| Soft Abrasive | Deep with T.C. Inserts | 10/15 or 15/25 or 15/30 | Abrasive Sandstone |
| Medium Hard | Standard with T.C. Inserts | 25/40 or 30/60 or 40/60 | Hard and slightly broken rock. |
| Hard and Broken | Low with T.C. Inserts | 40/80 or 60/80 | Hard granite, quartz, quartzite. |
| Extremely Hard and Uniform Solid | Low with or without T.C. Inserts | 80/110 | Extremely hard abrasive formations like quartzite hematite, granite, jasper. |
| METRIC | CONCENTRATION | RECOMMENDED USE |
|---|---|---|
| NON-ABRASIVE | ||
| Soft | High | Hard, slightly broken formations. |
| Soft | Medium | Solid, consolidated, hard and slightly broken. |
| Soft | Low | Unbroken very hard formations |
| AVERAGE ABRASIVE | ||
| Medium | High | Hard and broken formations. |
| Medium | Medium | Solid, consolidated, hard and slightly broken. |
| Medium | Low | Consolidated solid formations. |
| HIGHLY ABRASIVE | ||
| Hard | High | Hard and extremely broken formations |
| Hard | Medium | Solid, consolidated, hard and slightly broken. |
| Hard | Low | Consolidated solid formations. |