The Bernardo Multibor DB 21 multiple boring machine is a professional mortising machine with a 50 mm capacity, 1.5 kW motor, and a weight of 370 kg. Krollit, official Bernardo distributor since 2007.
- Number of spindles: 21
- Distance between spindles: 32 mm
- Distance first/last spindle: 640 mm
- Max drilling depth: 50 mm
- Table dimensions: 870 x 560 mm
- Spindle speed: 2800 rpm
Who uses the Multibor DB 21 multiple boring machine and for what purpose
Professional carpentry workshops and furniture factories use the Multibor DB 21 multiple boring machine for creating mortises for tenon joints on doors, windows, and furniture, with precise joints on rails and stiles.
Its place in the Bernardo range
The Bernardo Multibor DB 21 multiple boring machine is part of the Bernardo mortising machine 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 selection assistance.
Krollit Logistics and Support
Machine shipping in 5-9 business days (7 days to Southern Italy). For spare parts and accessories, shipping in 3-5 business days from Krollit warehouse. Customer support in Italian available for technical documentation, product sheets, and spare parts order management. Krollit has been an official distributor since 2007.
Who is the Multibor DB 21 multiple boring machine for?
The Multibor DB 21 multiple boring machine is recommended for the following professional profiles:
-
Professional carpentry workshops and furniture factories: creating mortises for tenon joints on doors, windows, and furniture.
-
Window and door manufacturers: working on rails and stiles with precise joints.
Not suitable for: mortising on metal or plastic (machine dedicated to wood: different processes are needed for other materials).
Table, dimensions, and geometry
| Table dimensions |
870 x 560 mm |
| Machine dimensions (L x W x H) |
1100 (3000*) x 1130 x 1300 mm |
| Weight |
370 kg |
Motor and power supply
| Motor power |
1.5 kW |
| Voltage |
400 V |
| Air pressure |
6 – 8 bar |
Other specifications
| Number of spindles |
21 |
| Distance between spindles |
32 mm |
| Note |
*With optional aluminum guide |
| Max drilling depth |
50 mm |
| Distance first/last spindle |
640 mm |
| Spindle speed |
2800 rpm |
Frequently Asked Questions
What can the Multibor DB 21 multiple boring machine work with?
It creates rectangular mortises for tenon-mortise joints on solid wood, plywood, and wood-based panels.
Bernardo HM square chisel mortising machines allow for the direct creation of right-angle mortises, without the need for manual finishing. Typical applications: door and window frames, chairs, furniture, and structural assemblies.
What chisel sizes does it support?
Typically chisels from 6 to 25 mm in width. Check the technical table for "drilling capacity" or "mortise capacity".
Bernardo HM chisels are dedicated accessories with a cylindrical shank and a hardened hollow tip. Krollit supplies original spare parts compatible with the HM 12, HM 25, and HM 30 series.
Is the head tiltable or rotatable?
Depends on the model: HM 25 has a 180° rotatable head, HM 25 TOP has a ±22.5° left/right tiltable head.
The rotatable head allows working on large pieces such as doors and frames from the back. The tiltable head allows for angled mortises for mitered assemblies.
What power supply does it require?
HM 12, HM 25, and HM 30 models are equipped with a 0.75 kW single-phase 230 V motor. See "Voltage" in the technical table.
The single-phase power supply makes these mortising machines usable even in workshops without a three-phase line. The machine still requires dedicated residual current protection.
How much does the machine weigh?
See the "Weight" data in the technical table. Typically 100 kg (HM 25) or 110 kg (HM 25 TOP).
The high cast iron mass provides rigidity during mortising, reducing vibrations and improving precision. For handling and installation, a hydraulic trolley or the help of a second operator is recommended.
