Techniques of product design

PRODUCT DESIGNArooj Zaidi

BAMBOO

Member of grass family Comprising of rhizome Hollow stem ( partitioned at the nodes) called

cane Nodes and internodes

BAMBOO & ITS RAPID GROWTH

Certain species grow more than a metre per day Certain species grow more than 3 metre per day Reach height of thirty metres and diameters of

35 cm. Rapid growth helps in soil erosion Renewable source Greenery in barren land

BAMBOO ASSEMBLY/JOINING

Ligatures alone can be use1. Friction tight rope connection Traditionally natural materials like bast, strips of bamboo

,hemp, are used as

the rope in connecting bamboo poles. Nowadays, iron wire

and plastic tapes/ropes are also used for friction-tight rope

connection. 

Pros and Cons: · Pros: 1) It is easy to build and simple for bamboo manufacturing. 2) It can be very strong with sufficient lashing techniques. 3) It can almost serve all the circumstances we need in building with bamboo. 4) It can drastically reduce the possibility of bamboo cracking because no notches or holes are in need in making such connections. 5) It is easier for sealing because we can apply epoxy or other materials as a coating. · Cons: 1) It will cost more bamboo materials. 2) The choice of rope material is another critical consideration. 3) The rope may be damaged by moisture, rot, insect, etc. 4) It requires some skills in doing lashing work. 

PLUG-IN/BOLT CONNECTIONS

this can be seen in garden

fences and furniture.

Pros and Cons: Pros: 1) It can provide a prettier appearance of the connection. 2) It does not need complicated lashing techniques. 3) The connection can stand huge forces if use a bolt/metal nail appropriately. · Cons: 1) Drilling or making a hole on bamboo poles can cause cracking and splitting. 2) Other materials like timber pin/bolt are needed, which will increase the cost. 3) The connection may be weak in tension in the vertical direction owing to shear problem. 4) It increases the difficulty in manufacturing, i.e., drilling, making wedge, etc. 

POSITIVE FITTING CONNECTIONS

Positive fitting bamboo connections are widely used in traditional bamboo buildings and other products like bamboo ladders and furniture.

 Pros: 1) It will create a prettier appearance for bamboo products. 2) It can be easily combined with other construction techniques, such as plug-in technique, lashing technique. 3) It is easy for sealing because small gaps can be found on the surfaces. · Cons: 1) It requires two bamboo poles in different diameters. 2) Making a hole on bamboo poles will drastically reduce its strength, and can cause cracking and splitting. 3) It calls for skillful manufacturers and also profession equipments. 

PROCESSING

CUTTING

REMOVAL OF MATTER

The cutting stroke has a tangible thickness : cutting by

Band saws Circular saws Oscillating saws Abrasion Water jet Laser Ultrasound flame

SAWING

Angle of attack TPI Set Cutting tool Speed of rotation

BAND SAW

Band of toothed steel Roughly cut items Straight & contoured cuts

CIRCULAR SAW

Cutting tool is toothed disc Cut precisely Only straight edges no contouring Either the saw move or workpiece move