Meca rotary tables, dividing heads and CNC 4th axis heads


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	Meca Precision Rotary Tables and Dividing Heads


	Meca is one of the few builders of 4th axis heads that has a compact design AND offers a hole through the spindle, allowing bar work. See the photo below. The motor is mounted high on the back of the head. Bar stock passes under the motor and its guards. This keeps the head profile small so it can allow full Y axis travel inside an enclosed machining center without colliding with the enclosure.

HH Roberts Machinery has been selling Meca heads and tables in Canada since 1967.




	Link to the Meca factory web site


	Click here to download the factory spec sheet of this CNC head.

Description			Unit	Model
Description			Unit	DCN160	DCN200	DCN250	DCN320	DCN400
Table diameter			mm	160	200	250	320	400
Center bore	With Morse taper bushing			CM4			CM5
	Without bushing	Standard	mm	28		50	65	65
	Without bushing	Optional	mm	30		60	80	90
Height to the center (table in vertical position)			mm	125	150	175	225	275
Working position of the table				Vertical / Horizontal (Optional)
Reference slide guide			mm	like customer order
Brake system				HYDROPNEUMATIC OR HYDRAULIC
Braking torque			Kgm	30		50	85	180
C.C. Servomotor			Nm	2		4	7	9
C.C. Servomotor			max. r.p.m.	2000
Total drive system ratio	A version			1:60		1:90
Total drive system ratio	B version			1:90		1:180
Ratio between encoder and rotary table	Encoder on worm shaft			1:60		1:90
Ratio between encoder and rotary table	Encoder on main spindle			1:1
Max. rotation speed	A version		r.p.m.	33		22
Max. rotation speed	B version		r.p.m.	22		11
Division resolution			Degrees	0,001°
Indexing accuracy	Encoder on worm shaft		Seconds	± 24			±20
Indexing accuracy	Encoder on main spindle		Seconds	±5
Max. adm. load	Horizontal position		Kg	150		250	350	500
	Vertical position at 200mm			75		125	150	225
	Vertical position with tailstock			100		150	225	325
Lowering torque			Kgm	50		100	180	300
Tangencial torque			Kgm	40		90	170	280
Net weight			Kg	70	90	145	170	290

Dimensioned outline drawings of the DCN series

Main features
Duplex system to take up of backlash between the worm shaft and worm wheel.
Can be used the plate vertically or horizontally (by order)
Spindle locking system through a powerful braking ring acting directly on the spindle, hydraulically actuated by hydro-pneumatic system with variable pressure adjustment incorporated in the dividing head itself or through a separate hydraulic pressure supply.
Motor and internal parts of the table are protected from coolant.
Spindle angle measured by rotating encoder mounted on the end of the worm wheel or on the spindle shaft itself, the application depending on the precision desired.
Motor positions: A (at line) and B ( transversal- like the picture)
NOTE:
Meca units can be supplied with the motor to the left and optional to the right, seen from the front.

Motors and encoders can be supplied by the customer.
For hydro-pneumatic or hydraulic brake systems, the components external to the device (flexible pipes, fixing muffs, etc.) should be ordered separately.
When ordering machines with incorporated central drive, up to 3 mt of pipes and electric cables are included.