Sorry, I couldn't duplicate this. Make sure your Sim is using the Robotics Workstation and let your Sim finish Tinkering once he starts.
I'm guessing you meant the Engineer career since I couldn't find a Fabricator career. I had my Sim change jobs from Freelancer/Paranormal Investigator to Engineer/Support Technician. His Daily Task is Tinker at Robotics Workstation. I sent him to Larry's Lagoon in Britechester and had him Tinker at Robotics Workstation. One of those progress circles came up in his queue around the action. The Daily Task went from Not Started to Complete once the progress circle was filled and the action ended.
This appears to be one of the newer form of Daily Task, where you have to finish the entire task at one time. No credit is given for partial progress. If the task gets interrupted, for any reason, you have to start over from the beginning. I don't like this form of Daily Task but the developers have been using it for most of the recent careers.
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