The Bernardo PS3-630 3-jaw cast iron chuck is a professional lathe chuck, weighing 250 kg. Krollit, official Bernardo distributor since 2007.
- Chuck size A: 630
- B: 135 mm
- C: 7 mm
- d: 545 mm
- E: 252 mm
- F: 586 mm
Who uses the PS3-630 3-jaw cast iron chuck and for what purpose
Machine shops and artisan turners use the PS3-630 3-jaw cast iron chuck 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 PS3-630 3-jaw cast iron chuck is part of Bernardo's range of lathe chucks, distributed in Italy by Krollit since 2007. The Bernardo range includes models of various categories and performances: 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 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 PS3-630 3-jaw cast iron chuck for?
The PS3-630 3-jaw cast iron chuck is recommended for the following professional profiles:
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Machine shops and artisan turners: secure clamping of round or hexagonal workpieces on a metal lathe for turning, drilling, and grooving operations.
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Users with a compatible flange Bernardo lathe: original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 DIN 55029 compliant mounting.
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Irregular or non-round workpieces: for eccentrically shaped workpieces, consider 4-jaw independent chucks or universal faceplates.
Technical specifications
| B |
135 mm |
| C |
7 mm |
| d |
545 mm |
| E |
252 mm |
| F |
586 mm |
| G |
M16 |
| h |
225 mm |
| J |
70 mm |
| Chuck size A |
630 |
| Max speed |
500 rpm |
| Approx. weight |
250 kg |
Frequently Asked Questions
When to use a 3-jaw chuck?
Self-centering 3-jaw 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 0.03-0.1 mm depending on the body material (steel = better precision, cast iron = standard).
Why a cast iron chuck?
Cast iron chucks (DK Camlock or PS series) offer excellent thermal dissipation and a robust structure at a lower cost compared to steel.
Cast iron: typical concentricity precision 0.03-0.1 mm. The DK Camlock series has quick-change mounting, while PS is the basic model. High service life in standard operations.
What workpieces is the Ø 630 mm diameter suitable for?
Suitable for large workpieces (max Ø ~600 mm): heavy industrial lathes.
The nominal diameter of the chuck indicates the maximum size of the body, not the machinable workpiece. The clamping capacity depends on the jaw opening (typically 60-70% of the nominal Ø).
How do I check compatibility with my lathe?
Check the mounting type of the lathe spindle nose (Camlock D3-D15, or threaded M-mount) and the corresponding diameter.
On modern lathes, Camlock mounting is the most common. On older lathes, there may be a threaded (M-) or flanged mount. The lathe's technical documentation indicates the exact type.
How is chuck precision maintained?
Regular cleaning of the scroll 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.
