The Bernardo Self-Centering 3-Jaw Chuck PS3-250/D6 in Cast Iron is a lathe chuck for professional use available at Krollit, an official Bernardo distributor since 2007.
- Quick Camlock mounting in accordance with DIN 55029 for fast assembly and disassembly
- 3 self-centering jaws for uniform and precise clamping of the workpiece
- 250 mm diameter – suitable for medium to large lathes
- Model: PS3-250/D6
- Diameter: 250 mm
- Number of jaws: 3
Who uses the Self-Centering 3-Jaw Chuck PS3-250/D6 in Cast Iron and for what
Mechanical workshops and artisan turners use the Self-Centering 3-Jaw Chuck PS3-250/D6 in Cast Iron 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 Bernardo range
The Bernardo Self-Centering 3-Jaw Chuck PS3-250/D6 in Cast Iron is part of the Bernardo lathe chuck range, distributed in Italy by Krollit since 2007. The Bernardo range includes models of various categories and performance levels: to choose the right machine for your use case, you can consult the Bernardo catalog on Krollit or contact customer support for assistance with selection.
Krollit logistics and support
Shipping within 3-5 working days from Krollit warehouse for spare parts and accessories. Customer support in Italian available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the Self-Centering 3-Jaw Chuck PS3-250/D6 in Cast Iron for?
The self-centering 3-jaw chuck PS3-250/D6 in cast iron 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 during turning, drilling, and grooving operations.
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Users with a Bernardo lathe with a compatible flange: original replacement or upgrade for Bernardo lathes (Profi, Hobby, etc.) with an A2 mounting in accordance with DIN 55029.
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Irregular or non-round workpieces: for symmetrically off-center workpieces, consider 4-jaw independent chucks or universal faceplates.
Frequently Asked Questions
When to use a 3-jaw chuck?
3-jaw self-centering chucks are for cylindrical, hexagonal, and 3-6-9-12 sided workpieces. The jaws move together with a single key (self-centering).
It is the most common chuck on lathes: quick clamping of symmetrical workpieces, typical concentricity precision of 0.03-0.1 mm depending on the body material (steel = better precision, cast iron = standard).
What is the body of the chuck 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.
What workpieces is the Ø 250 mm diameter suitable for?
Suitable for medium workpieces (max Ø ~220 mm): professional lathes.
The nominal diameter of the chuck indicates the maximum size of the body, not that of the workable workpiece. The clamping capacity depends on the jaw opening (typically 60-70% of the nominal Ø).
What does the D6 mounting indicate?
The D6 code (Camlock according to DIN 55029) identifies the size of the lathe spindle nose: D3-D5 for small lathes, D6-D8 for medium, D11-D15 for industrial.
Check the mounting of your lathe before purchasing: the interface flange must exactly match the code. Camlock = quick closing with cams, disassembly in 30 seconds without tools.
How is the precision of the chuck maintained?
Regular cleaning of the spiral mechanism, periodic lubrication with specific chuck grease, 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.
