00/092009

Semi Automated Coconut Semi Automated Coconut Rafter Making MachineRafter Making Machine

snmanosnmano

ME 219 – Machine Design & Project Introduction1

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Design Tree

User Needs

Engineer’s Perspective

Main Problems Sub Problems

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User Needs

• Time and money consumption for extracting a rafter should be low.

• Rafters should be fairly straight through out.

• Should be easy to use.

• Maintenances of the machine should be low.

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Engineer’s Perspective

• DimensionsThe cross section 3.5x2 - 5x2 inches

Length of a rafter 3-10 cubits

• Number of finished rafters per hour is 20cubits in length.( Minimum )

Main Problems

Main Problems

Remove the outer skin

Remove the core of the trunk

Parting out rafters

Achieve required dimensions

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Sub Problems

Sub Problems

Power Source Mounting Stability Safety

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Power Source

ElectricityMainly there are electric motors and conveyor

belts.

Fuel

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Remove the Outer Skin

Remove the Outer Skin

Remove it from the whole trunkRemove it from the whole trunkRemove it after parting the

trunk into raftersRemove it after parting the

trunk into rafters

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Remove the Core of the Trunk

Remove the Core of the Trunk

Remove it from the whole trunkRemove it from the whole trunkRemove it from each rafter

after parting the trunkRemove it from each rafter

after parting the trunk

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Remove it from the whole trunk

• Using scraping rollers

Single roller or Multiple roller arrangement

• Continuous scrapingIn these 2 methods either

Roller is stationary & trunk is moving on a conveyor belt

or

Trunk is stationary & tool is moving.

• Reciprocating cutting tool

Tool is stationary & the trunk is moving

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Remove it from each rafter after parting the trunk

• Reciprocating cutting toolTool is stationary & the trunk is moving

• Continuous scraping

• Using scraping rollersSingle roller arrangement

In last 2 methods either

Roller is stationary & trunk is moving on a conveyor belt

or

Trunk is stationary & tool is moving.

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Remove it from the whole trunk

• Drilling

• Broaching

These are having certain limitations The trunk should be short in length. Trunk should be fairly straight. Also high amount of power is required.

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Remove it from each rafter after parting the trunk

• Continuous scraping

• Scraping roller arrangement

• Planing

Using an automated planer

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Parting out the rafters

• One rafter at a timeUsing a power operated circular saw

Using a reciprocating power operated sawUsing a chain sawBy cutting grooves using drilling or broaching

• Multiple rafters at the same timeUsing multiple power operated circular saws

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Achieving required dimensions

• Length

• Cross sectionUsing power operated saws ( Reciprocating or Circular saws)

Using an automated planer

Scraping the surfaces

Scraping rollers

reciprocating cutting tool

Continuous scraping

Mounting

Here we have to consider about tool mounting & how tomount the coconut trunk. But tool mounting is different fordifferent kind of processes.

• mount the tools (device) on the trunk as it slide by our force

• Mount the device on a sliding support as it is easy to move the device forward.

• Coconut trunk can be mounted as in manual rafter making process.

Stability

• When we mount the device on the trunk as it slide by our force, then the whole stability has to be handled by the operator.

• Damping and shockabsober arrangement should be employed. ( due to vibrations)

Safety

• Use a safety guard against waste which is removed in the process.

These waste can be used as a bio fuel.