in older posts, I presented our current solution for pick+place of e-chain parts. Cycle time of 5-6 sec/pick is the most critical issue (we can not operate much faster due to missing stiffness of the igus arm). We now solve this issue by using our arms on drylin rails, in addition we use 2 units to feed one mounting unit.
Result: reduction of cycle time!
We expect a final cycle time of 2,5 sec with this “5+1” unit (or better 2x(5+1): 2 drylin carriages and 2 pcs roboolink arms with 5 DOF). We will present the new mounting unit in operation at SPS show in Nürnberg by the end of NOV. Sales price for total 12 DOF unit will be BELOW 10.000,- € (detailed pricing will be announced at SPS show). We use BECKHOFF control parts here.
Video of first test runs….
We supply 2 options of encoders for our joints / joint arms.
Option 1 (our Standard before HMI 2017): Motorencoder plus Ini switch for 0-point reference on the joint output (PRT bearing)
Option 2): Output encoder on the PRT bearing of the joint. This is our own development, we use a magnetic ring plus Encoderchip on the output with an aditional magnet and Hall Sensor as reference point. Please find attached a description of the output encoder attached in GER and ENGL. Advantage: less cables, higher resolution, more accuracy for the arm.
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)
the main differences between our gears and standard metal gears are:
ours are lubrication free (no grease, no oil) and very lightweight due to plastic and aluminium parts instead of steel, brass or bronze (=standard design). The same is valid for the bearings we use on the output (igus PRT = polymer round tables).
This makes it very easy to open our joints, in case worm wheels need to be exchanged (reasons for exchange might be: broken gear teeth due to overload on the output or the need to change gear parts due to changing conditions like temperature,…). The video shows how to proceed:
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.