Precision tables BB series

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The tables manufactured by Meccanica Besnatese range from small to large-size systems, in compliance with standard instructions. Just as for manufacturing on third parties account, the company is ready to accomplish mass-produced work orders in a limited number up to single units.

The components in use are purchased from the most qualified suppliers to offer customers a top-quality finished product for easy replacement.

The tables included in the catalogue are generally used for positioning and handling light objects and if no high level of accuracy and rigidity is required, they can offer an excellent quality/price ratio.

BB series

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Overall dimensions

Overall dimensions
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Type of table
 Dimensions (mm)
A B C D E F-G H I L1 L2 P d1 L3 L4 d2 M
BB 150
 100
 150 75 100 360 150 55 18 18 60 120 4x60 6,5 120 120 M6 According to the motor type
200
 200 460 55 110 4x60
300
 300 600 75 60 4x120
400
 400 700 75 50 5x120
BB 180
 150
 180 80 150 440 180 55 20 20 70 150 4x75 8,5 150 150 M8
250
 250 540 55 120 4x75
350
 350 680 75 115 3x150
450
 450 780 75 90 4x150
BB 240
 200
 240 100 200 550 240 55 20 32 75 200 4x100 8,5 200 200 M8
300
 300 650 55 125 4x100
400
 400 800 80 100 6x100
500
 500 900 80 50 8x100

Motor support connection

Motor support connection Type of table A1 B1 I D S1 S2 df da L
BB 150 150 73 50 54 10 33 M5 10 15
BB 180 180 78 64 63 15 47 M6 12 20
BB 240 240 98 80 85 22 60 M6 15 27

Constructive features

Type of table
 Screw Guides Structure Protections
Tipe ø x pitch Tipe Size
BB 150
 ball screw ground
single nut
pre-loaded		 16x10 Single guides with ball
sliding blocks		 15 Aluminium alloy Bellow
BB 180
 20x10 15
BB 240
 25x10 20

Screws - features and admissible loads

Screws are supported on both ends on all tables of the BB series.

Type of table Diameter
per pitch		 Admissible load (N) Axial
clearance		 Accuracy
degree
micron		 Repeatability
mechanical
accuracy
micron
C stat. C dyn.
BB150
 16x5 8400 5600 - IT5
E/300=23		 10
BB180
 20x10 25000 14500 - 10
BB240
 25x10 31500 20500 - 10

Speed

Type of table
 Travel mm n (r / min) max screw

 The trolley traversing speed is proportional
to the pitch (p:mm) and to the screw revolutions.
The maximum values specified by
the table (n=rev/min) consider the critical
screw speed, according to the ø and free
length between the constraints.
Example:
n • p 2400x10=400 mm/sec
60      60                         

Lubrification
Screws and guides are properly lubricated
at the time of assembly.
However, the system lubrication shall be
checked at regular intervals. If necessary,
restore initial conditions.
Centralised oil lubrication systems can be
installed on TV2/TV3 tables, upon request.
BB 150
 100 2400
200 2250
300 2100
400 2000
BB 180
 150 2600
250 2500
350 2400
450 2300
BB 240
 200 3200
300 3100
400 3000
500 2900

Construction tolerance values

Type of tables Trolley levelness Value (μm) Trolley side movement
parall. or vertical		 Travel mm Accuracy micron
BB 150
Trolley levelness 20 Trolley side movement parall. or vertical < 150 15
BB 180
 25 150 - 300 20
BB 240
 30 > 300 25

Accessories and variants
• Motor support for direct assembly or indirect assembly by means of motion transmission gears
• Axis limit stop
• Customisation for assembling and fastening equipment

Appicable loads (N)

 Appicable loads Type of table
 Admissible load (N)
FV = FL
Static Dynamic
BB 150
 29000 15000
BB 180
 50000 27000
BB 240
 102000 58000

Moments applicable

Type of table Admissible moments (Nm)  Moments applicable
MT ML=MR
Static Dynamic Static Dynamic
BB150
 1560 660 1305 675
BB180
 2750 1485 2100 1134
BB240
 6120 3480 5059 2876

Weight of tables

Type of table
 Total weight of tables (Kg) Trolley
weight (Kg)
and related
parts
Travel 100 Travel 150 Travel 200 Travel 250 Travel 300 Travel 350 Travel 400 Travel 450 Travel 500
BB150
 7,5   8,5   9,5   10,5     2
BB180
   11   13   15   17   3
BB240
     23   26   29   32 7