Fab@Home:Model 2 Base

From Fab @ Home

The machine base refers to the large exterior structure that contains the other subassemblies listed here.

It consists of six large parts made from acrylic, forming a partially enclosed box for the x,y, and z axes of motion for the printer, and also uses various pieces of hardware listed here and in the bill of materials.

Render of the completed chassis

1 Assembly
- 1.1 Prepare the parts
- 1.2 Assembly
2 Photos
- 2.1 Parts
- 2.2 Assembly

Assembly

Prepare the parts

Put the X-AXIS COUPLER on a 62:1 Snap motor
Screw the X-axis motor into the X Axis motor support plate as shown.
Put the Z-axis pulley on a 62:1 Snap motor
Screw the Z-axis motor into the Z Axis motor support plate as shown.
Put the 6mm bearing in the X axis shaft support plates
place the 6mm bearing in the Right Side plate
place the 4mm bearing in the Z axis shaft support plate such that the flange faces the Z-axis motor when the part is installed.
Set the Large thermoplastic inserts into the Bottom plate

Assembly

Attach the X axis shaft support plates to the Back plate with the flanges facing outwards as shown
Attach the X axis motor support plate and Z axis tensioner support plates to the back plate as shown
Attach the top plate to the Back plate as shown using 6-32 screws and square nuts.
Attach the Left plate as shown
Attach the Right plate as shown. Take extreme caution with this step.
Attach the Z-axis motor
1. Attach the Z axis motor support plate and the Z axis shaft support plate to the back plate
2. Slide the 25 mm shaft through the 4mm bearing in the Z axis shaft support plate and the shaft collar, located between the plates and flush with the bearing. When assembled, tighten the set screw on the coupler.
Attach the X axis tensioner side support plates to the top plate
Attach the front plate
Attach the bottom plate
Assemble the Snap hub support plates' as shown attach them Snap hub support plates to the rest of the Chassis
Assemble the X axis drive
1. slide the 6mm diameter shaft through the right side plate's bearing
2. slide a X axis drive pulley onto the shaft with the thinner flange facing the motor support plate.
3. slide the shaft through the bearing in the shaft support plates
4. place the other 'X axis drive pulley onto the shaft with the thinner flange facing the shaft coupler.
5. Slide the shaft into the shaft coupler
6. Tighten all set screws
Assemble X/Z tensioners
1. Z axis tensioner
  1. place a ' tensioner side plate ' onto the ' y axis tensioner front plate ' with the 4mm bearing facing towards the thermoplastic insert
  2. place a 4mm Shaft into the bearing
  3. place a Tensioner Pulley onto the shaft with the teeth aligned with the insert
  4. place the other ' tensioner side plate' onto the shaft and ' tensioner front plate ' with the bearing facing towards the pulley
2. 2 X axis tensioners
  1. place a ' tensioner side plate ' onto the ' y axis tensioner front plate ' with the 4mm bearing facing towards the thermoplastic insert
  2. place a 4mm Shaft into the bearing
  3. place a Tensioner Pulley onto the shaft with the teeth aligned with the insert
  4. place the other ' tensioner side plate' onto the shaft and ' tensioner front plate ' with the bearing facing towards the pulley
Place X and Z tensioners into the base.

Photos

Parts

Bottom plate	Top plate	Right Side plate	Left Side plate
Front plate	Back plate	X Axis motor support plate	Z Axis motor support plate
X axis shaft support plates	Z axis shaft support plate	Snap hub support plates	Z axis tensioner top

Assembly

Back plate with the X axis shaft support plates	Back plate with the X axis motor	Back plate with the Top plate	Chassis with Left plate
Attaching the Right plate	Attaching the Z axis motor	The X axis tensioner side support plates	Attaching the Front plate
Attaching the Bottom plate	The Snap hub support plates	The X axis drive assembly