Flott GBF 30 / MK IV is a lathe chuck for professional use, with Morse Taper MK IV. Krollit, official Flott distributor since 2007.
- Threading capacity: M10 – M30
- Taper connection: Morse MK IV
- Machine compatibility: Flott drills and stations with MK IV connection
- Structure: High-strength hardened steel
Who uses the GBF 30 / MK IV and for what
Mechanical workshops and artisan turners use the GBF 30 / MK IV as a clamping accessory on metal lathes, ensuring secure clamping and centering of the workpiece during turning, drilling, and grooving operations.
Its place in the Flott range
Flott GBF 30 / MK IV is part of the Flott lathe chuck range, distributed in Italy by Krollit since 2007. The Flott range includes models of various categories and performances: to choose the right machine for your use case, you can consult the Flott catalog on Krollit or contact customer support for selection assistance.
Krollit logistics and support
Shipping 3-5 business days from Krollit warehouse for spare parts and accessories. Italian customer support available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the GBF 30 / MK IV for
The GBF 30 / MK IV is recommended for the following professional profiles:
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Mechanical workshops and artisan turners: secure clamping of round or hexagonal workpieces on metal lathes for turning, drilling, and grooving operations.
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Users with a Bernardo lathe with a compatible flange: original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 connection compliant with DIN 55029.
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Irregular or non-round workpieces: for non-symmetrically centered workpieces, consider independent 4-jaw chucks or universal platforms.
Frequently asked questions
When to use this chuck?
It is a self-centering chuck for clamping workpieces on the lathe during turning operations.
Self-centering chucks allow quick clamping of the workpiece with a single key. The choice depends on the shape of the workpiece (cylindrical, square) and the body material (steel or cast iron).
What is the chuck body made of?
The material is indicated in the title: steel (PO series) for maximum precision, cast iron (DK/PS series) for standard use.
The choice depends on the intensity of use and the required tolerance: steel for production and precision, cast iron for general use.
Which diameter to choose?
The choice of diameter depends on the lathe spindle nose (it must match the fitting) and the dimensions of the workpieces to be machined.
Typical diameters: 80-160 mm for hobby lathes, 200-315 mm for professional lathes, 400-630 mm for industrial lathes.
How do I check compatibility with my lathe?
Check the type of fitting of the lathe spindle nose (Camlock D3-D15, or threaded connection M-) and the corresponding diameter.
On modern lathes, the Camlock fitting is the most common. On older lathes, there may be a threaded (M-) or flanged connection. The lathe's technical documentation indicates the exact type.
How is chuck precision maintained?
Regular cleaning of the spiral mechanism, periodic lubrication with specific chuck grease, and concentricity check every 6 months with a dial indicator.
A jaw that moves with difficulty indicates chips or rust in the mechanism: disassemble, clean, and grease. Concentricity is checked by mounting a ground bar and measuring with a dial indicator: acceptable tolerance 0.03-0.1 mm depending on the model.
