Threading and Grooving for Sliding Machines
The patented four-edged threading insert has advantages over conventional three-edged type, mainly because it has an extra cutting edge at a comparable price.
A large range is stocked 40-8 TPI 0.5-3.0 ISO all fitting one tip holder.
Tip holders are stocked in usual ISO standard sizes.
Special forms and grooving inserts can be manufactured to order.
Pitch Range
ISO: 0.5mm – 3.0mm
GROOVE & CHAMBER TO DIN 471/472
Imperial: 40 – 8 T.P.I.
ISO GRADES: P30 K20 K20C
4 Edge Insert
| A | B | Ref |
| 10 | 110 | J |
| 12 | 125 | K |
| 16 | 150 | M |
| Specials to Order | ||
Drawings
Cutting Speed Guide (metres/minute)
| Material | P30 | K20 | K20C |
| Carbon Steel | 80–100 | – | 200–250 |
| Alloyed Tool Steel | 70–100 | – | 140–180 |
| Stainless Steel | 70–100 | 70–90 | 110–200 |
| Cast Iron | – | 70–90 | 120–175 |
| Non-Ferrous | – | 120–180 | 150–300 |
Additional Cutting Recommendations
| Pitch mm | 0.5 | 1.0 | 1.25 | 1.5 | 2.0 | 3.0 |
| Pitch tpi | 48 | 24 | 20 | 16 | 12 | 8 |
| No. of Passes | 4–6 | 4–8 | 5–9 | 6–10 | 7–12 | 9–14 |
| It is important to select a toolholder with the most appropriate helix clearance angle. This is to avoid the sides of
the insert rubbing against the thread flanks produced during the screw cutting operation. The following charts are guides in determining the helix angle generated, simply by cross-referencing the major diameter of the thread to be cut with its pitch (ISO) or TPI (imperial). |
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Grooving External Toolholder
 Dimensions in mm.
ISO Grades: P30 – K20 – K20C |
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| Full Radius Groove | |||
| Width | Depth | Alt. Depth | |
| SER – 1010 – F | 0.8 | 1.3 | 2.3 |
| SEL – 1010 – F | 1.2 | 1.3 | 2.3 |
| SER – 1212 – F | 1.8 | 1.3 | 2.3 |
| SEL – 1212 – F | 2.0 | 2.3 | |
| SER – 1616 – H | 3.0 | 2.3 | |
| Groove and Chamber to DIN 471/472 | |||
| Width | Depth | Groove No. | |
| SEL – 1616 – H | 1.24 | 0.36 | 1.1 |
| SER – 2020 – K | 1.44 | 0.45 | 1.3 |
| SEL – 2020 – K | 1.74 | 0.60 | 1.6 |
| SER – 2525 – M | 1.74 | 0.75 | 1.6 |
| SEL – 2525 – M | 1.74 | 0.85 | 1.6 |
| SER – 3232 – P | 1.99 | 1.10 | 1.85 |
| SEL – 3232 – P | 2.29 | 1.35 | 2.15 |