Concept:
The material bed chosen is a solid bed. This structure consists of either metal or wood and is the table that supports the entire the device. The linear rails, drivers, and the gantry are on top. This design optimized for backlash because the devices are installed directly into the bed rather than placed on top and more material is used as support. The bed is the table that allows the machine to fit any size requirement because suitable tables are required for beds that contain just the rails.
A moving gantry covers the most
surface area of the desired cutting material. The gantry moves on the XYZ
planes of motion. The gantry attaches to the table by the X-axis rails. The Y
and Z-axis rails attach to the gantry. The system minimizes rail usage.
Linear rails and bearings direct
the motion of the router. Round linear rails have a lower load capacity
compared to profile rails but the rails work. These rails operate at higher
speeds due to less friction. Warped structures the rails attach to do not cause
the bearings to become unmovable. The X, Y, and Z-axis use these.
Liner drivers attach to motors and
linear rails. The motors cause the drivers to move which cause the rails to
move. Rack and pinion drivers allow splicing for larger axes. Low torque motors
work with rack and pinion drivers and create high efficiency. Larger CNC
routers use them for the X and Y-axis. ACME screws are efficient for smaller
axes. They are more accurate than rack and pinions but the difference is
negligible in larger units. ACME screws are slower than rack and pinions.
Larger CNC routers use them for the Z-axis.
For this design, a solid bed is
chosen for stability. The moving gantry allows for more coverage of the router.
The round liner rails allow for slight warping of wood. The liner drivers allow
for both longer and shorter axes and the efficient use of different types of
drivers.
Why:
Solution 1 contains all elements necessary for the
specifications.
Solution 2:
Concept:
The material bed chosen is a bed that consists of the linear rails and drivers and gantry. This type of bed allows for minimal building materials and can be supported on any table but the size makes transporting the device difficult without disassembling the machine. The lack of extra materials also makes the machine unsteady as extra metal or wood applied to the frame and gantry reduces backlash from the router. This style of bed suits a smaller CNC router rather than a larger one.
A moving gantry covers the most
surface area of the desired cutting material. The gantry moves on the XYZ
planes of motion. The gantry attaches to the table by the X-axis rails. The Y
and Z-axis rails attach to the gantry. The system minimizes rail usage.
Linear rails and bearings direct the motion of the router. Profile linear
rails have a higher load capacity and are ridged. These rails operate at lower
speeds due to more friction. Warped structures the rails attach to cause the
bearings to become unmovable. The X, Y, and Z-axis use these.
Liner drivers attach to motors and
linear rails. The motors cause the drivers to move which cause the rails to
move. Rack and pinion drivers allow splicing for larger axes. Low torque motors
work with rack and pinion drivers and create high efficiency. Larger CNC
routers use them for the X and Y-axis. ACME screws are efficient for smaller
axes. They are more accurate than rack and pinions but the difference is
negligible in larger units. ACME screws are slower than rack and pinions.
Larger CNC routers use them for the Z-axis.
For this design, a rail only bed is
chosen for the use of fewer materials. The moving gantry allows for more
coverage of the router. The profile liner rails allow for high load. The liner
drivers allow for both longer and shorter axes and the efficient use of
different types of drivers.
Why:
Solution 2 meets most criteria but falls behind in the
specification regarding efficient parts.
Concept:
The material bed chosen is a solid bed. This structure consists of either metal or wood and is the table that supports the entire the device. The linear rails, drivers, and the gantry are on top. This design optimized for backlash because the devices are installed directly into the bed rather than placed on top and more material is used as support. The bed is the table that allows the machine to fit any size requirement because suitable tables are required for beds that contain just the rails.
A static gantry is used when the
material moves on the rails. This design contains a hybrid design. The router
attached to the gantry moves on the X and Y-axis. The gantry is layered to
incorporate the two different moving axes. The Y-axis is doubled to incorporate the size of the cutting
material. A static gantry has less interference with wires.
Linear rails and bearings direct
the motion of the router. Round linear rails have a lower load capacity
compared to profile rails but the rails work. These rails operate at higher
speeds due to less friction. Warped structures the rails attach to do not cause
the bearings to become unmovable. The X and Z-axis use these. The Y-axis uses
drawer slides. Smaller machines use drawer slides because the slide has to move
in and out of the slide casing in order to move which causes the machine to
displace more space. Slides are not equipped with the ability to use linear
drivers. The slides are common and can carry large loads.
Liner drivers attach to motors and
linear rails. The motors cause the drivers to move which cause the rails to
move. Rack and pinion drivers allow splicing for larger axes. Low torque motors
work with rack and pinion drivers and create high efficiency. Larger CNC routers
use them for the X and Y-axis. ACME screws are efficient for smaller axes. They
are more accurate than rack and pinions but the difference is negligible in
larger units. ACME screws are slower than rack and pinions. Larger CNC routers
use them for the Z-axis.
For this design, a solid bed is
chosen for stability. The hybrid gantry allows for more coverage on the Y-Axis
and less wires. Drawer slides carry larger loads. The round liner rails allow
for slight warping of wood. The liner drivers allow for both longer and shorter
axes and the efficient use of different types of drivers.
Why:
Solution 3 does not meet most criteria. The solution falls
behind in the support of desired cutting material, efficient use of parts, and
size of machine.
Concept:
The material bed chosen is a solid bed. This structure consists of either metal or wood and is the table that supports the entire the device. The linear rails, drivers, and the gantry are on top. This design optimized for backlash because the devices are installed directly into the bed rather than placed on top and more material is used as support. The bed is the table that allows the machine to fit any size requirement because suitable tables are required for beds that contain just the rails.
A static gantry is used when the
material moves on the rails. This design contains a generic static gantry where
the router attached only moves on the Z-axis. The material bed is attached to
rails that move the material on the X and Y-axis. This design reduces the size
a CNC router can support because the machine size is doubled to cover the
entire size of one particular piece of cutting material. The material bed is
layered because one layer is attached to the x-axis rails and the other layer
is attached to the Y-axis rails. A static gantry has less interference with
wires.
Linear rails and bearings direct
the motion of the router. Drawer slides are used for smaller machines because
the slide has to move in and out of the slide casing in order to move which
causes the machine to displace more space. Slides are not equipped with the
ability to use linear drivers. The slides are common and can carry large loads.
These slides are used for the X and Y-axis. A profile linear rail is used for
the Z-axis. Profile linear rails have a higher load capacity and are ridged.
These rails operate at lower speeds due to more friction. Warped structures the
rails attach to cause the bearings to become unmovable.
Liner drivers attach to motors and
linear rails. The motors cause the drivers to move which cause the rails to
move. Rack and pinion drivers allow splicing for larger axes. Low torque motors
work with rack and pinion drivers and create high efficiency. Larger CNC
routers use them for the X and Y-axis. ACME screws are efficient for smaller
axes. They are more accurate than rack and pinions but the difference is
negligible in larger units. ACME screws are slower than rack and pinions.
Larger CNC routers use them for the Z-axis.
For this design, a solid bed is
chosen for stability. The static gantry eliminates wire interference. Drawer
slides carry larger loads. Profile linear rails are rigid and allow high loads.
The liner drivers allow for both longer and shorter axes and the efficient use
of different types of drivers.
Why:
Specification Grid:
Why:
Solution 4 does not meet most criteria. The solution falls
behind in the support of desired cutting material, efficient use of parts, and
size of machine.
Specification Grid:
Specification Grid
|
||||
Specifications
|
Solution 1 |
Solution 2 |
Solution 3 |
Solution 4 |
The CNC router must be able to cut desired material precisely.
|
+
The machine is designed to cut wood.
|
+
The machine is designed to cut wood.
|
+
The machine is designed to cut wood.
|
+
The machine is designed to cut wood.
|
The machine must be able to support 2’x4’ pieces of plywood
|
+
The machine can support the load and size of the piece of wood.
|
+
The machine can support the load and size of the piece of wood.
|
-
The machine can support the load but not the size of the piece of
wood.
|
-
The machine can support the load but not the size of the piece of
wood.
|
The machine should use the most efficient parts.
|
+
The solid bed allows for stability. The moving gantry allows surface
coverage. The linear rails allow for warping of wood and load. The linear
drivers allow for larger and small axes.
|
-
The rail bed does not allow stability. The moving gantry allows
surface coverage.
|
-
The solid bed allows for stability. The hybrid gantry does not allow
for coverage of surface area. The linear drivers allow for larger and small
axes.
|
-
The solid bed allows for stability. The static gantry does not allow
for coverage of surface area. The linear drivers allow for larger and small
axes.
|
The machine should be of the smallest size possible to cut a 2’x4’
piece of plywood.
|
+
The machine is just large enough for 2’x4’ pieces of wood.
|
+
The machine is just large enough for 2’x4’ pieces of wood.
|
-
The machine is too small for 2’x4’ pieces of wood.
|
-
The machine is too small for 2’x4’ pieces of wood.
|
Tally of Ratings
|
4+
|
3+
|
1+
|
1+
|
Final Solution
I intend to develop solution 1. The solution meets all
specifications. The solid material bed allows for stability. The moving gantry
allows greater surface area coverage. The only down fall is that the wiring is
longer. The linear rails allow wood to settle over time. Since the machine will
be in an environment that is close to the ocean, the wood may warp. These rails
are not affected by warping and are made from materials that do not rust. The
combination of rack and pinion and ACME screws allow for different sized rails.
