we run regular lifetime tests with our gears in our lab. Based on these tests, we did some inside changes in our gears, most important is the change of gear geometry and gear pulley material during the last months (from iglidur J to iglidur A 180). By this, we improved lifetime and friction (efficiency) in the joints. Please find attached NEW data sheets for our joints, now also including the current standard transmission ratios we can supply from stock (from 1:5 up to 1:70).
NEW Data sheet for symmetrical joints with 2 bearings (vertical installation)
NEW Data sheet for asymmetrical joints with 1 bearing (horizontal installation)
we supply either components (joints, motors, cables,…) or complete electro-mechanical joint arms. compared to industrial robots, the composition of a robolink joint arm is quite easy and can be reproduced by “everybody”. We show the composition of a 5 DOF joint arm in 3 single video clips:
- assembly of joints, “motorkits” and “Inikits” (for 0-point reference),
- assembly of an arm
- cabling of the arm
these films shall help you to understand the idea of our joint kit and how easy it is to change, modify or configure our arms.
Video 1) joint assembly
Video 2) arm assembly
Video 3) cabling of a joint arm
At this year’s MOTEK show in Stuttgart (GER) we will show the possibility to build 4 DOF robot arms with our motorized joints. 2 films at the end of this entry show 2 possible concepts:
1) “small” version with 4 joints size 30 – 30 -20 – 20, built with igus DC motors. No programming possible, just a joystick control.
2) “big” version with 4 joints size 50 – 50 – 30 – 20, built with igus stepper motors and a robolink gripper.
Please be aware that both arms are no sales products. They are examples of how a joint arm could look like. The connection parts are made of folded metal sheet parts. Please contact me for further questions in this issue (firstname.lastname@example.org).
Also attached our new catalogue (this version in GER with more RL-D infos and german list prices). Eng. version will follow soon.
LINK: de_robolink_08-2015 (3.80 mb)
And additionally 2 updated versions of tech. data sheets for symmetrical joints (version 101 with 2 PRT) and asymmetrical joints (version 102 with 1 PRT)
LINK: tech-data-rl-d-101_d-eng_15_11 (171.03 kb)
LINK: tech-data-rl-d-102-_d-eng_16_01 (162.11 kb)
The team of Jan Kedzierski (Ph.D.) from Wroclaw University of technology now presents their NEW generation of the autonomous robot FLASH. It is (again) equipped with 2 pcs. 5 DOF robolink wire driven joint arms. They developpped their own drive technology for this robot based on DC/BLDC motors as an open source project. It will be published soon, I will link to their project then.
we do several lifetime and performance tests with our robolink D joints. Until July, main topics were material and geometry optimisations for the gear and bearing components. Nowadays, we do lifetime tests for different joint types at different loads and speeds. The attached film shows or test unit with currently 9 test places, it will be enlarged in the next weeks up to 12 oor 14 test places.
Some numbers and facts that we found out until now:
# general efficiency factor for our current material combination (iglidur J with aluminum HC) is betweeen 0,28 and 0,35 (over all sizes).
# output torque at tooth-break: 19 Nm (size -20) and 30 Nm (size -30), measured at room temperature for first movement. Today we measure this “breaking torque” at continuous operation. Main influences are the rotation speed, and together with this, the temperature in the gear. We see a huge loss of “breaking torque” in operation. For size -20 we find a safe number at high speed rotation of 2,5 Nm (>100.000 cycles) and 3,5 Nm at low speed rotation.
we see good potential for improvement in the material combination and geometry optimisation.