2.0 Task 1 : Vessels

(1)Top View, (2)Front View, (3)View, (4)Wire Mesh (2)

(4)

VESSEL 1

Exploration

Twisting the object while keeping the number of sides same. Base - Wide Middle - Narrow Top - Wide

Attempt 1

Base of the vessel was distrupted due to change in base height and the air pressure was too high.

Reflection

Adjusting the nozzle height in the script if the base height changes and controlling the air pressure manually.

(1)Top View, (2)Front View, (3)View, (4)Wire Mesh (2)

(4)

VESSEL 2

Exploration

To create an object like a twisting onion dome. Base - Narrow Middle - Wide Top - Narrow

Attempt 1

The speed of the robot was 75%-80% which was too high and hence the object collapsed midway.

Reflection

The object was printed smoothly when the robot speed was decreased to 25% because the clay layer below got more time to settle.

(1)Top View, (2)Front View, (3)View, (4)Wire Mesh (2)

(4)

VESSEL 3

Exploration

A simple twisted doubly curved vessel with four curved faces. Base - Wide Middle - Narrow Top - Wide

Attempt 1

Printed perfectly.

Reflection

The speed of the robot could be increased to 50%-75% as the shape is very simple with less weaves.

(1)Top View, (2)Front View, (3)View, (4)Wire Mesh (2)

(4)

VESSEL 4

Exploration

A cup with multiple smooth twisting flutes. Base - Narrow Middle - Wide Top - Wider

Attempt 1

Printed perfectly at the start but ran out of clay halfway.

Reflection

When the object is narrow at base and very wide at the top the object can be printed upside down as it is easier to print with a wider base. Always have a look at the amount of clay before printing.

(2)

(4)

(1) Defect due to high robot speed, (2) Defect due to small nozzle width, (3) Defect due to change in base height, (4) Defect due to change in pressure

FACTORS AFFECTING PRINTING ACCURACY

Nozzle (Extrusion Width): The nozzle should be cut accurately both horizontally straight along the hole as well as in height. If the nozzle width is too small, the layer of clay is very thin and the object deforms by self weight.

Clay: It is important to ensure that there is no air bubbles in the clay tube and enough clay to print entire object as, if the tube runs out of clay the air pressure deforms the model.

Layer Height: Consistent layer height is very important factor of clay printing. If the layer height is too less the nozzle drags the clay of the layer beneath and defroms the object and if the layer height is too high the precision of the printed object is affected.

FACTORS AFFECTING PRINTING ACCURACY

Air Pressure: Air pressure must be accurately set as less air pressure and high speed of printing may create inconsistency in the printing.

Robot Speed: The speed of the movement of robotic arm affects the printing. Objects with too many dense weaves or the ones with a greater overhang need to be printed at a slow speed.

Reflection: All the factors are related to each other in some or the other way. Key point is to change one factor at a time rather than all of them.

(5) Diagram explaining relationship between different factors.

(2)

(4)

(1)Step1 - Designing object using Rhino, (2)Creating two spiral one side and one outside the object, (3)Step 3 - Joining them using Sweep2, (4)Step 4 - Intersecting sweeped form with the object

CREATING A CUSTOM OBJECT

Step 1

Make object in rhino or make the object in grasshopper and bake it.

Step 2

Draw two spirals (0.8 to 1.2 mm depending on the layer height), one inside the object and one outside the object.

Step 3

Loft the two spirals or use sweep 2 to create surface.

Step 4

Use intersect command and intersect the lofted spiral and the object. The intersection can be imported in grasshopper script to be printed.