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Slab Mill
Rollin Bicskei and Travis Haley
Problem Statement
Design and build a mill that will auto-matically cut junk slabs to standard firewood lengths.
Background
• After the client is done processing logs in to lumber there are leftover slabs unfit for standard use.
• Instead of wasting the wood it can be processed in to firewood.
Specifications
• PTO shaft driven, 550rpm, 34hp• Hydraulically powered drive units• 12-24” cuts off of 16’ slabs• Maximum width of slabs 20”• Manually loaded slabs• Portable, most likely on a trailer
System Diagram
Conveyor
Adjustable Stop
Saw Blade
Gap between conveyors
Conveyor
Roger Howes
Wood SlabsClamp
1
2
3&45
6
7
Electrical System DiagramPLC Cut Length
Selection Buttons
Slab Fully Advanced?
Sensor
Mechanical Stop Pos. Sensors
Clamp Pos. Sensors
Saw Vert. Pos. SensorsConveyor Motor
Valve
Worm Gear Motor (Horizontal Positioning)
Chainsaw Motor (for motion) Valve
Chainsaw Valve
Mech. Stop Motor (Vertical
Positioning)
Sensors (Input)
Mechanisms(Output)
Hydraulic System Schematic
Mechanical Stop
Conveyor
Cutting Mechanism
Mechanical Stop State Diagram
Raise
stop
Stop- right
Pause
16”
20”
24”
Lower
Stop
To conveyor S.R.
State
stop==up
Stop==right
lengthsel.==24”
lengthsel.==20”
lengthsel.==16”
dist==16”
dist==20”
dist==24”
stop==down
raise stop
lower stop move left
move right
Pause
lengthsel.==dist
lengthsel.!= dist
Conveyor State Diagram
pause
Conv-eyor off
Conv-eyor on
From mech. Stop routine
To clamp routine
stop==down
stop sensor == 1conveyor != on
State
Conveyor Status
Clamp State Diagram
Pause
Raise clam
p
Lower
clamp
To saw routine
From saw routine
To stop routine
conveyor==off
clamp==down
From conveyor routine
clamp==up
State
raise clamp lower clamp
Saw System Diagram
State
raise saw lower saw
Pause
Cut-ting
Raise
Saw
to clamp routine
from clamp routine
clamp==down
saw==through
saw==up
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