The Bernardo Profi 550 WQV bench lathe is sized for professional laboratories, craft workshops, and advanced hobbyists with requirements for machining medium-to-large parts, advanced threading, and separate cross feeds. Distance between centers 550 mm, center height 125 mm, swing over bed Ø 250 mm, spindle bore Ø 26 mm MT 4 taper, self-centering chuck DK11 Ø 125 mm with flange, speed range 50-1,000 / 100-2,000 rpm (continuous adjustment). Longitudinal feeds (6) 0.06-0.32 mm/rev, cross feeds (4) 0.03-0.075 mm/rev. Metric threads (18) 0.2-3.5 mm, imperial threads (21) 8-56 TPI. Tailstock quill travel 70 mm MT 2 taper. Motor 0.75 kW (S1) - 1.0 kW (S6) at 230V single-phase, weight 120 kg, machine dimensions 1,210 × 610 × 450 mm (without stand). Distributed in Italy by Krollit as official Bernardo distributor since 2007.
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Distance between centers: 550 mm
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Center height: 125 mm
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Swing over bed: Ø 250 mm
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Spindle bore: Ø 26 mm MT 4 taper
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Self-centering chuck: DK11 Ø 125 mm with flange
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Speed range: 50-1,000 / 100-2,000 rpm (continuous adjustment)
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Longitudinal feeds: (6) 0.06-0.32 mm/rev
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Cross feeds: (4) 0.03-0.075 mm/rev
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Metric threads: (18) 0.2-3.5 mm
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Imperial threads: (21) 8-56 TPI
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Digital display: Speed indication
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Motor: 0.75 kW (S1) / 1.0 kW (S6) - 230V single-phase
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Weight: 120 kg
Who uses the Profi 550 WQV and for what
The Bernardo Profi 550 WQV is the top lathe in the Profi range: weight 120 kg, dimensions 1,210 × 610 × 450 mm. Distance between centers 550 mm (the widest in the Profi range), center height 125 mm, swing over bed Ø 250 mm. Self-centering chuck DK11 Ø 125 mm with Ø 26 mm spindle bore MT4 taper (larger bore than the Profi medium range which has Ø 20 mm MK3). The Ø 26 mm bore allows machining of larger diameter through-bars, a crucial feature for bar stock production. The Profi 550 WQV has a distinctive feature: continuous electronic speed adjustment with digital indication. Dual range (50-1000 / 100-2000 rpm) selectable via mechanical gearbox. Difference from the Profi 550 WQ (6-step mechanical gearbox): the WQV allows fine speed adjustment optimal for any material, while the WQ has greater stability under load. A distinctive feature of the 550 W range: separate longitudinal feeds (6 steps 0.06-0.32 mm/rev) and cross feeds (4 steps 0.03-0.075 mm/rev). This allows choosing different feeds for the two turning directions, a crucial feature for complex roughing + finishing cycles. Metric threads 18 steps (0.2-3.5 mm) and imperial threads 21 steps (8-56 TPI): the widest coverage in the Profi range. Dedicated threading dial for quick setup of standard threads. Motor 0.75 kW (S1) - 1.0 kW (S6): less powerful than the Profi 450 but with superior feeds and threading (the 550 range is sized for the production of more complex parts requiring multiple operations, not aggressive roughing). In Krollit customer laboratories, the Profi 550 W range is chosen by professional craft workshops with regular production of complex threaded parts, prototyping labs, and advanced vocational technical schools.
Its place in the Bernardo range
The Bernardo Profi metal lathe range is organized by progressive size and features: Profi 300 V, 400 G, 400 V (compact 60-65 kg, 0.50-0.60 kW motor, electronic variable speed) for advanced hobbyists and small workshops; Profi 450 S and 450 S Vario (medium 112 kg, 0.90 kW motor) for craft workshops with daily use; Profi 550 WQ and 550 WQV (heavy 120 kg, 0.75 kW motor but with separate longitudinal + cross feeds and complete threading) for professional production of complex threaded parts. Below the Profi range is the Hobby range (entry-level 14-130 kg); above it is the Goliath range (heavy industrial 1,500-3,500 kg).
The Profi 550 WQV is the top of the Profi range with continuous speed: the dimensions and features of the 550 WQ but with fine speed adjustment. Difference from the 550 WQ (mechanical gearbox): WQV for variety of materials and fine tuning, WQ for stability under load. For heavy industrial use (over 250 mm swing over bed or very heavy parts), the Goliath range is correctly sized. For less intensive use with medium-sized parts (Ø 230 mm), the Profi 450 S/450 S Vario is correctly sized.
Krollit logistics and support
Bernardo shipping in 5-9 business days (7 days to Southern Italy). With a weight of 120 kg, it requires a pallet jack or two to three people for careful unloading. The machine is supplied WITHOUT a stand: for positioning, a dedicated Bernardo stand or a robust workbench (capacity 200+ kg) is recommended. Spare steel gears, additional self-centering chucks, inserts for 4-way tool post, original Bernardo accessories and spare parts available from stock with 3-5 business days shipping. Customer support in Italian is available.
Who is the Profi 550 WQV for
| Profile |
Compatibility |
Reason |
| Professional craft workshop with production of complex threaded parts |
Recommended |
Metric threads 18 steps (0.2-3.5 mm) + imperial threads 21 steps (8-56 TPI): the widest coverage in the Profi range. Separate longitudinal (6 steps) and cross (4 steps) feeds for complex cycles. |
| Mechanical prototyping lab |
Recommended |
Spindle bore Ø 26 mm MT4 taper for bar stock parts. Dedicated threading dial for quick setup. Continuous adjustment for fine tuning on specific materials. |
| Advanced hobbyist with advanced threading needs |
Suitable |
Machine oversized for occasional standard hobby use. For simpler needs, the Profi 300 V/400 G/400 V/450 S models are significantly cheaper. |
Not suitable for: heavy industrial use with parts over Ø 250 mm (the Goliath range is correctly sized); simple occasional hobby use (oversized; the compact Profi range 60-65 kg is significantly cheaper); three-phase 400V power supply (for workshops with three-phase lines, the 400V version of the Hobby 500 or Goliath range is correctly sized); programmed CNC (Profi lathes are manual, not CNC).
Machining capacity
| Specification |
Value |
| Distance between centers |
550 mm |
| Center height |
125 mm |
| Swing over bed |
Ø 250 mm |
| Bed width |
135 mm |
Spindle
| Specification |
Value |
| Spindle bore |
Ø 26 mm |
| Spindle bore taper |
MT 4 |
| Self-centering chuck |
DK11 Ø 125 mm with flange |
Speed and feeds
| Specification |
Value |
| Speed range |
50-1,000 / 100-2,000 rpm (continuous adjustment) |
| Longitudinal feeds |
(6) 0.06-0.32 mm/rev |
| Cross feeds |
(4) 0.03-0.075 mm/rev |
Threads
| Specification |
Value |
| Metric threads |
(18) 0.2-3.5 mm |
| Imperial threads |
(21) 8-56 TPI |
Tailstock
| Specification |
Value |
| Tailstock quill travel |
70 mm |
| Tailstock taper |
MT 2 |
Motor and power supply
| Specification |
Value |
| Motor power S1 100% |
0.75 kW |
| Motor power S6 40% |
1.0 kW |
| Voltage |
230V single-phase / 50 Hz |
Digital indication
| Specification |
Value |
| Speed display |
Digital rpm indication |
Dimensions and weight
| Specification |
Value |
| Machine dimensions (L × W × H) |
1,210 × 610 × 450 mm (without stand) |
| Weight |
120 kg |
Compliance
| Specification |
Value |
| Marking |
CE |
| Directive |
Machinery Directive 2006/42/EC |
Standard equipment
- Bernardo Profi 550 WQV lathe complete
- Self-centering chuck DK11 Ø 125 mm with flange
- Flange Ø 125 mm
- Cross slide with top support
- Spare gears
- 4-way tool post
- Fixed tailstock
- Threading dial
- Spindle guard
- Splash guard
- Leadscrew cover
- Digital speed indication
- Tool kit
- User manual in Italian
Frequently Asked Questions
What is the advantage of separate longitudinal and cross feeds?
It allows choosing different feeds for the two turning directions: longitudinal feed (carriage moving parallel to the workpiece axis) and cross feed (carriage moving perpendicular). This is a crucial feature for machining cycles that require fast roughing in one direction and slow finishing in the other.
Practical example: turning a shaft with longitudinal roughing (0.2-0.32 mm/rev feed for fast material removal) followed by cross finishing of a shoulder (0.03-0.05 mm/rev feed for precise lateral surface finishing). Without separate feeds, the operator would have to change gears between the two operations, slowing down the cycle. With separate feeds, the change is automatic via a selection lever.
Is the 230V single-phase power supply really sufficient for professional use?
For the Profi 550 WQV, yes. The 0.75 kW (S1) - 1.0 kW (S6) motor is sized for continuous use at 230V single-phase. The machine is sized for professional craft workshop use, not for heavy industrial production.
Recommended check before installation: electrical line with adequate cross-section (4 mm² cable for 0.90+ kW motor, 2.5 mm² for 0.50-0.80 kW motors), dedicated 16-20A circuit breaker, CEE 16A 230V industrial socket. For workshops with other simultaneous loads (compressors, extractors), check the available power on the meter (minimum 6 kW for simultaneous use). For heavy industrial use, the Goliath range with a 9 kW three-phase 400V motor is correctly sized.
What parts can I machine with the Profi 550 WQV?
Typical parts: cylindrical turning of shafts and cylinders up to Ø 250 mm and length 550 mm between centers, facing, grooving, chamfering and radiusing, metric threads (18) 0.2-3.5 mm and imperial threads (21) 8-56 TPI. Typical materials: mild steels (Fe360, S235), alloy steels (C45, 39NiCrMo3), stainless steels (AISI 304, 316), aluminum and light alloys, brass, bronze, engineering plastics.
Limits: maximum Ø over bed 250 mm, spindle bore Ø 26 mm (maximum limit for through-bars). For larger parts, the higher models in the Profi range or the Goliath range are correctly sized. For occasional standard hobby use, all Profi models are suitable; for regular production with specific parts, check the capacity of the chosen model.
Do I need to purchase a separate stand?
Yes, if you want to install the machine in a fixed position in the workshop. The Profi 550 WQV is supplied WITHOUT a stand: it is typically installed on a dedicated Bernardo stand (purchased separately) or on a robust workbench with a load capacity exceeding 200 kg.
The dedicated Bernardo stand for the Profi medium/heavy range includes: folded steel sheet structure, height adjustment for operator ergonomics, integrated chip tray, and optionally tool drawers. For daily professional use, the dedicated stand is recommended for greater stability during machining and for ergonomics.
Is the machine already complete or do I need additional accessories?
The machine comes with standard equipment sufficient for immediate use: self-centering chuck DK11 Ø 125 mm with flange, 4-way tool post, fixed tailstock, spare steel gears, spindle guard, splash guard and leadscrew cover, tool kit.
Optional accessories typically purchased separately: self-centering chucks of different diameters, steady rests for long parts, 4-jaw chuck for non-cylindrical parts, additional turning tool sets (HSS, carbide), collets for MK3/MT4 spindle. For most standard operations, the basic equipment is sufficient; for specific productions, evaluate dedicated accessories. All original Bernardo accessories are available from Krollit with 3-5 business days shipping.
