DA 78

Ultralight and compact welding servo actuator

DA78s are roller screw electric actuators specially designed for ultralight welding guns. With the minimal weight of only 6.1 kg, these actuators can generate high forces of up to 13 kN.

DA78 has shown excellent performance in those projects of car body manufacturers, where workshop space is limited requiring high equipment density.
Model DA78-A35 DA78-A310
Peak force 13 000 N 7000 N
Max. speed 325 mm/s 650 mm/s
Stroke 150 mm 150 mm
Screw lead 5 mm/rev 10 mm/rev
Dynamic load rating 33 500 N 20 000 N
Basic dimensions 78x78 mm (cross section),
320 mm (length)
78x78mm (cross section),
320 mm (length)
Force repeatability ±3% ±3%
Base weight 6.1 kg (with Fanuc encoder) 6.1 kg (with Fanuc encoder)
Protection level IP65 IP65
Ambience temperature range 0 to +50°C 0 to +50°C
Service life 20+ million weld cycles 20+ million weld cycles
Maintenance grease adding once in 15 million cycles grease adding once in 15 million cycles
Mounting front flange / trunnions / side mounting front flange / trunnions / side mounting
Feedback sensor depends on robot type: resolver or absolute encoder depends on robot type: resolver or absolute encoder
Voltage 230V or 400V 230V or 400V
Electric brake
In order to provide additional gun arms fixation when power supply is off, servo actuator may be equipped with a brake preventing arms displacement caused by gravity. Long-armed guns with substantial weight may require this option.
Built-in water cooling

Built-in water cooling circuit enables high performance in the most intense applications with heavy-duty welding cycles.

DA 78 with water cooling
Manual drive
Usually, during the gun assembly, rod extension and retraction can be performed by screwing/unscrewing it (except for the actuators with a built-in anti-rotation). A manual drive may be needed when it’s necessary to manually retract/extend rod without rotation.
Radial Load Support
For applications with increased radial forces affecting the actuator rod Diakont has developed a solution allowing higher side loads of up to 650N.
Robot Controller Supply Voltage Robot Controller Model Robot Control Software
ABB 400 VAC IRC 5 Manual tuning is available (contact Diakont). Including in ABB motor list can be done upon request
(40A or 80A drive)
R-30iB Plus
Manual tuning is avaliable (contact Diakont). ID 49589 Manual tuning is available (contact Diakont) from V9.10P/31 for 40A
(for other voltages contact Diakont)
KR C4 ServoGunBasic avaliable for KSS 8.3 and higher (contact Diakont)
Yaskawa 230 VAC YRC-1000
Including in Yaskawa motor list can be done upon request
Kawasaki 230 VAC E52G-A021,
E42 (series E2X, E3X, E4X, E5X)
Including in Kawasaki motor list can be done upon request
Comau 400 VAC C5G,
C5G Plus
Including in Comau motor list can be done upon request
Nachi 230 VAC FD11 controller with ROX xx2x drive (any ROX drive with third digit = "2") Including in Nachi motor list can be done upon request
Hyundai 230 VAC Hi5a-S Including in Hyundai motor list can be done upon request
Customized solutions

Do you have questions about our solutions or need personal advice? Take advantage of our many years of experience, the high technical competence of our team and our wide range of services.