DOUBLE-ENDED PARTING-OFF AND GROOVING BLADE FOR GL INSERTS_GLS B

General information

• Manufacturer: Dormer Pramet
• Main operations: parting-off, tube parting-off, deep radial grooving and shallow radial grooving
• Working conditions: stable and unstable conditions as primary use; very unstable conditions as possible use
• The insert pocket size must match the insert: a GL2 blade takes only GL2 inserts, a GL3 blade takes GL3 inserts, and so on
• A dedicated insert change key is included in the package; GL2 to GL6 blades use key KV 15x150
• Shank type S: steel body without internal coolant channels, so coolant must be supplied externally

Usage notes

• Mount the blade in a tool block of matching blade height and set the cutting edge on the workpiece centre line.
• Keep the blade overhang as short as the required cutting depth allows, and never exceed the CDX value of the blade.
• Open the spring clamp only with the supplied key when changing inserts, and check that the insert is fully seated before machining.
• Choose the insert geometry and feed for the workpiece material (see the selection guide).

The GLS B series from Dormer Pramet consists of universal tool blades for external parting-off and grooving on lathes and turning centres. Each blade holds a double-ended GL insert in a spring-clamp seat and is mounted in a DU / D type tool block. The blades were launched together with the GL insert family, whose 25 mm long double-edged inserts provide up to 60% deeper grooving capacity than the earlier LCMF16 insert.

Key features

• Blade heights of 26 mm (length 125 mm) and 32 mm (length 150 mm)
• Maximum cutting depth of 35 mm on 26 mm blades and 50 mm or 60 mm on 32 mm blades; GL1 blades for 1.5 mm inserts reach 16 mm
• Pocket sizes GL1 to GL6 for cutting widths from 1.5 mm to 6 mm
• Double-sided clamping key included, allowing inserts to be replaced with one hand
• Treated blade body for longer tool life
• Neutral cutting direction on GL2 to GL6 blades; GL1 blades are available in right-hand and left-hand versions

Applications

• Parting-off of bars and tubes
• Deep and shallow radial grooving
• Steels, stainless steels and cast iron when used with GL inserts in grade G8330
• Stable and unstable machining conditions

Flat, straight blade designed to be clamped in a DU / D tool block, with spring-clamp insert seating for double-ended GL inserts. Dimensions are specified with the following designations:

• H: blade height, 26 mm or 32 mm
• LF: functional length (blade length), 125 mm or 150 mm
• CW: cutting width, set by the insert, 1.5 mm to 6 mm
• CDX: maximum cutting depth, 16 mm to 60 mm
• HF: functional height, from the base of the blade to the cutting edge

Selecting the right blade and insert

Blade height and cutting depth

• 26 mm blades (LF 125 mm): maximum cutting depth 35 mm with GL2 and GL3 inserts, 16 mm with GL1 inserts.
• 32 mm blades (LF 150 mm): maximum cutting depth 50 mm with GL2, GL3 and GL4 inserts, 60 mm with GL5 and GL6 inserts, 16 mm with GL1 inserts.
• Select the blade height that fits the tool block of your lathe, then the pocket size for the required groove width.

Insert cutting width by pocket size

GL1: 1.5 mm
GL2: 2 mm
GL3: 2.5 mm and 3 mm
GL4: 4 mm
GL5: 5 mm
GL6: 6 mm

A narrower insert removes less material when parting off; a wider insert gives a stronger cutting edge for deep grooves and larger diameters.

Insert geometry by application

Insert grade

G8330 is a versatile PVD-coated grade for steels, stainless steels and cast iron. Selected GL inserts are also offered in grade T7325.

Reference cutting data

Pramet example for parting-off C45 steel with coolant using GL3 inserts: PR geometry on bar at vc 140 m/min and f 0.14 mm/rev; PM geometry on tube at vc 140 m/min and f 0.1 mm/rev. Use these values as a starting point and adjust to the machine and setup.