Bernardo Profi 550 WQ metal lathe – 550 mm distance between centers, 250 mm swing over bed, 26 mm spindle bore MT 4 taper, 0.75 kW 230V single-phase motor, 120 kg weight
Bernardo Profi 550 WQ metal lathe – 550 mm distance between centers, 250 mm swing over bed, 26 mm spindle bore MT 4 taper, 0.75 kW 230V single-phase motor, 120 kg weight is backordered and will ship as soon as it is back in stock.
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Description
The Bernardo Profi 550 WQ bench lathe is sized for professional workshops, craft workshops, and advanced hobbyists with requirements for machining medium to large workpieces, 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 (6) 125-2,000 rpm (mechanical gearbox). 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 an official Bernardo distributor since 2007.
- 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: (6) 125-2,000 rpm (mechanical gearbox)
- 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
- Motor: 0.75 kW (S1) / 1.0 kW (S6) - 230V single-phase
- Weight: 120 kg
Who uses the Profi 550 WQ and for what
The Bernardo Profi 550 WQ 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 bore MT4 taper (larger bore than the Profi medium range which has Ø 20 mm MK3). The Ø 26 mm bore allows machining of through bars of larger diameters, a crucial feature for bar stock production. The Profi 550 WQ has a 6-speed step transmission (125-2000 rpm). Difference from the Profi 550 WQV (continuous speed): mechanical gearbox for stability under load vs. continuous adjustment for fine tuning precision. 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 for aggressive roughing). In Krollit customer workshops, the Profi 550 W range is chosen by professional craft workshops with regular production of complex threaded parts, prototyping laboratories, and advanced technical vocational 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 full threading) for professional production of complex threaded parts. Below the Profi range is the Hobby range (entry-level 14-130 kg); above is the Goliath range (heavy industrial 1,500-3,500 kg). The Profi 550 WQ is the professional mechanical gearbox model in the heavy Profi range: 6 step speeds for stability under load, separate longitudinal + cross feeds, full threading (18 metric + 21 imperial). Difference from the 550 WQV (continuous): WQ for stability in high-load machining, WQV for fine tuning. For heavy industrial use, the Goliath range is correctly sized. For less intensive use, the Profi 450 S is correctly sized.
Krollit Logistics and Support
Bernardo shipping in 5-9 business days (7 days to the South). With a weight of 120 kg, it requires a pallet truck or two to three people with care for unloading. The machine is supplied WITHOUT a stand: for positioning, a dedicated Bernardo stand or a sturdy workbench (capacity 200+ kg) is recommended. Spare steel gears, additional self-centering chucks, inserts for 4-position tool post, original Bernardo accessories and spare parts available from stock with 3-5 business day shipping. Customer support in Italian available.
Who is the Profi 550 WQ 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 feeds (6 steps) and cross feeds (4 steps) for complex cycles. |
| Mechanical prototyping laboratory | Recommended | Spindle bore Ø 26 mm MT4 taper for bar stock. Dedicated threading dial for quick setup. Mechanical gearbox for stability under load. |
| Advanced hobbyist with advanced threading requirements | Suitable | Over-spec'd machine for occasional standard hobby use. For simpler requirements, 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); occasional simple hobby use (over-spec'd; the Profi compact 60-65 kg range is significantly cheaper); three-phase 400V power supply (for workshops with a three-phase line, the 400V version of the Hobby 500 or Goliath range is correctly sized); programmed CNC (Profi are manual lathes, not CNC).
Working 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 |
Speeds and feeds
| Specification | Value |
|---|---|
| Speed range | (6) 125-2,000 rpm (mechanical gearbox) |
| 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 |
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 2006/42/EC |
Standard equipment
- Bernardo Profi 550 WQ lathe complete
- Self-centering chuck DK11 Ø 125 mm with flange
- Flange Ø 125 mm
- Cross slide with top support
- Spare gears
- 4-position tool post
- Fixed tailstock
- Threading dial
- Spindle guard
- Splash guard
- Leadscrew cover
- 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 (feed 0.2-0.32 mm/rev for fast material removal) followed by cross finishing of a shoulder (feed 0.03-0.05 mm/rev for precise surface finishing of the side). 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 truly sufficient for professional use?
For the Profi 550 WQ, 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 artisanal laboratory use, not for heavy industrial production.
Recommended check before installation: power 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, industrial CEE 16A 230V 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 WQ?
Typical parts: cylindrical turning of shafts and cylinders up to Ø 250 mm and length 550 mm between centers, facing, grooving, chamfering and filleting, 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, technical 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 standard occasional 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 WQ 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 is supplied with standard equipment sufficient for immediate use: self-centering chuck DK11 Ø 125 mm with flange, 4-position 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 workpieces, 4-jaw chuck for non-cylindrical parts, additional turning tool sets (HSS, carbide), collets for MK3/MT4 spindle. For most standard machining operations, the basic equipment is sufficient; for specific productions, evaluate dedicated accessories. All original Bernardo accessories are available from Krollit with 3-5 business day shipping.
