3d Printing

A robot in your tool belt?


New tools often lead to new building materials that can optimize the benefits of the new technology. How will you be able to benefit from the emerging tool technology of hand held robots?  Here is a report on recent research:
Researchers develop intelligent handheld robots
What if handheld tools know what needs to be done and were even able to guide and help inexperienced users to complete jobs that require skill? Researchers at the Univ. of Bristol have developed and started studying a novel concept in robotics—intelligent handheld robots.
Historically, handheld tools have been blunt, unintelligent instruments that are unaware of the context they operate in, are fully directed by the user, and critically, lack any understanding about the task they are performing.

Dr. Walterio Mayol-Cuevas and PhD student, Austin Gregg-Smith, from the Dept. of Computer Science, have been working in the design of robot prototypes as well as in understanding how best to interact with a tool that “knows and acts”. In particular, they have been involved with comparing tools with increasing levels of autonomy.

Compared to other tools such as power tools that have a motor and perhaps some basic sensors, the handheld robots developed at Bristol are designed to have more degrees of motion to allow greater independence from the motions of the user, and importantly, are aware of the steps being carried out. This allows for a new level of co-operation between user and tool, such as the user providing tactical motions or directions and the tool performing the detailed task.

Handheld robots, aim to share physical proximity with users but are neither fully independent as is a humanoid robot nor are part of the user’s body, as are exoskeletons. The aim with handheld robots is to capitalize on exploiting the intuitiveness of using traditional handheld tools while adding embedded intelligence and action to allow for new capabilities.

Dr. Mayol-Cuevas, Reader in Robotics Computer Vision and Mobile Systems, said: “There are three basic levels of autonomy we are considering: no autonomy, semi-autonomous when the robot advises the user but does not act, and fully autonomous when the robot advises and acts even by correcting or refusing to perform incorrect user actions.”

The Bristol team has been studying user’s task performance and user preferences on two generic tasks: pick and drop of different objects to form tile patterns, and aiming in 3-D for simulated painting.

Austin Gregg-Smith, a PhD student who is sponsored by the James Dyson Foundation, added: “Our results indicate that users tend to prefer a tool that is fully autonomous and there is evidence of a significant impact on completion time and reduced perceived workload for autonomous handheld.  However, users sometimes also expressed how different it is to work with this type of novel robot.”
The plans for constructing the robot on a 3D printer can be downloaded.

I am quite sure, however, that there will also be a need for manual hammer, screw driver, knife, shovel, trowel, and pliers, and also the trained mechanics that know how to use them. At least, I hope there will be; otherwise we can all pack up and collect unemployment.

Source: Univ. of Bristol via rdmag.com, 05/27/2015

More info: http://handheldrobotics.org/

5 Observations about Prefabrication

Why is Australia so far behind other nations 
when it comes to prefab or offsite site modular?

That's the question someone posted at Australian Construction Innovation, a LinkedIn group. Curiously, I hear the same question about prefabricated construction in the United States. So the question is one of perspective.

My sense is that prefabrication is at exactly the right level. Here are five reasons:

1. Prefabrication is very common.

Consider: Prefabricated trusses, metal buildings, precast concrete structures, HUD Code (mobile) housing, prefabricated classrooms, panelized wall systems, and more. Cutting and bending concrete reinforcing used to be done on site; now its prefabricated. I can cite many similar examples.

2. Large Scale Integration are Vulnerable to Economic Cycles. 
I was a consultant to a firm that built a highly automated factory to prefab panels for complete building structures. The high-performance, semi-finished panels assembled quickly in the field to enclose entire buildings in a single day. Then the Great Recession of 2008 hit. While it hurt all of us, capital intensive companies were hit harder. When work fell away the firm had to idle the factory and then went bankrupt due to financing costs.

3.  Site Work Can't be Prefabricated.
Next time you hear about how quickly the Chinese can erect a prefabricated building, note that the days until completion does not include the time it takes to run utilities to the site, place foundations, and attend to other sitework. When projects are built on site, above ground construction overlaps the sitework.

4.  Prefabrication Imposes Design Restraints.
While fabrication automation continues to improve, no prefabricated whole-building system can provide as much design flexibility as a project assembled from open sourced components. Designers and developers like flexibility. They also require it to deal with unique site conditions.

5. Site Assembly Is Amazingly Efficient.
This is my favorite explanation. Today's construction systems can be really efficient. Consider what the screw gun and pneumatic fasteners mean to the time required for framing. Concrete masonry units may take more time to set than precast, but they are in inventory and can can be installed in the time it takes to engineer, get approvals, fabricate and ship prefab components.

Looking ahead, the whole discussion about prefab will change when we start using onsite systems to print structures, assemble them with robots, or using other emerging technologies.

prefabAUS, an Aussie trade association that promotes prefabrication says, on its website, "Prefab has often been referred to as ‘architecture’s oldest new idea’." They chronology begins with the Romans in 43 AD. I push the beginning of prefabrication back to even earlier to the tents of nomads.

Animation from Wikimedia Commons 

3D Printed Ceramics


This beautifully edited video may help you understand the potential for printed construction products and systems.  This machine is printing ceramics.  Still small in size, but imagine it scaled up to produce entire wall panels, building modules, or structures.
"Eran Gal-Or, an industrial design student from H.I.T institute in Holon, Israel built a 3d printer that prints ceramic materials - porcelain, clay & glass. This is a massive 80x80x80 cm darwin style 3D printer, and probably the largest in the world. The printer prints porcelain in a continuous way using a feeding system he developed, which includes a commercial moineau pump and a refilling plunger type extruder."

Video at http://www.youtube.com/watch?v=N1LF14QhNyY, photos and quote from http://www.3ders.org/articles/20120806-israeli-student-develops-largest-3d-porcelain-printer.html