SLA Platform Elevator Model
Dr. David W. Rosen
3/3/00
The Elevator and Platform of a SLA-250 machine is modeled in ProEngineer to illustrate some
basic concepts of datum usage and parametric model construction. The model is shown in
Figure 1.
Note that the geometry of all parts was defined earlier. In this example, these completed parts
are positioned and assembled into the SLA machine assembly.
Overall Strategy
• Define a coordinate systems (datums) with which to position other subassemblies.
• Create SLA machine coordinate system.
• Create Lift coordinate system.
• Position Vat relative to SLA machine.
• Position Lift relative to SLA machine.
• Position entire elevator subassembly relative to Lift.
• Position parts such that constraints follow the power flow through the system. Aids with
subsequent modifications, mechanism analysis, animations, and tolerance analysis.
Construction Steps:
1
Define SLA machine coordinate system (Datum Coordinate System – ProE)
2
Add Vat, position relative to Machine. See Figure 2
a. Align Offset – ProE, offset from XY plane.
3
Define Lift coordinate system (DCS – ProE). See Figure 3.
a. Align Offset – ProE, offset in –X, +Z directions.
4
Add ElevatorBack, position relative to Lift system. See Figure 4.
5
Add TopSupport, mate with ElevatorBack. See Figure 5.
a. Mate rear of TopSupport with front of ElevatorBack.
b. Align top of TopSupport with top of ElevatorBack.
c. Align right side of TopSupport with right side of ElevatorBack.
6
Add BottomSupport, mate with ElevatorBack. See Figure 5.
a. Mate rear of TopSupport with front of ElevatorBack.
b. Align top of TopSupport with top of ElevatorBack.
c. Align right side of TopSupport with right side of ElevatorBack.
7
Add RightSlide and LeftSlide, mate with TopSupport. Positioned correctly relative to
BottomSupport. See Figure 5.
a. Align centerlines of Slides with centerlines of holes in TopSupport.
b. Mate top surface of Slides with top surfaces of holes in TopSupport.
8
Add TopBearing and BottomBearing to support the LeadScrew. Mate with
TopSupport and BottomSupport, respectively. See Figure 6.
a. Align centerlines of Bearings with Supports.
b. Mate top surfaces for TopSupport and bottom surfaces for BottomSupport.
9
Add LeadScrew, mate with TopBearing. Positioned correctly with BottomBearing.
See Figure 6.
a. Align centerlines of LeadScrew with TopBearing.
b. Mate shoulder surface of LeadScrew with bottom surface of TopBearing.
10
Add Elevator, mate with LeadScrew and Lift system. See Figure 6.
a. Align centerline of middle hole in Elevator with centerline of LeadScrew.
b. Mate Offset from XY plane of Lift coordinate system to XZ plane of Elevator.
11
Add Platform, mate with Elevator. See Figures 1, 7, and 8.
a. Mate front surface of Elevator with back surface of top horizontal block of
Platform.
b. Align top surface of Elevator with top surface of Platform.
c. Align right surface of Elevator with right surface of Platform.
Figure 1 Completed SLA Machine Elevator.
Figure 2 Vat Added, positioned relative to SLA Machine.
Figure 3 Lift Coordinate System Added.
Figure 4 ElevatorBack Added, Positioned relative to Lift.
Figure 5 Top & Bottom Supports, Left & Right Slides Added.
Figure 6 Leadscrew, Bearings, and Elevator Added.
Figure 7 Platform Added, Complete Elevator.
Figure 8 Wireframe view.