Lay-Up Formulas
Reference for pre-laminated (PRE) material codes, thickness calculations, and the lay-up code system.
Related Documents: Codes & Tags Material Modeling
PRE Code Format
PRE_[face]_[core]_[backer]_[thickness in mm]
- Use Epicor
GM.SG.XXXXXcodes with leading zeros dropped - Multi-core layups repeat the core number
Example: PRE_438_331_7_19 = face GM.SG.00438 + core GM.SG.00331 + backer GM.SG.00007 + 19mm total
Multi-core example: PRE_438_331_331_7_37 = face + two layers of core + backer at 1.5” total
Thickness Formula
Each face (veneer or plastic laminate, regardless of spec) is assumed to be 1/32” (0.03125”) thick.
Total = face + core + backer
Standard Lay-Up Thicknesses
| Category | Components | Formula | Modeled Thickness |
|---|---|---|---|
| 1/4” lay-up | VN/PLAM + 1/4” MDF/PB + VN/PLAM | .03125 + .25 + .03125 | 0.3125” |
| 1/2” lay-up | VN/PLAM + 1/2” MDF/PB + VN/PLAM | .03125 + .5 + .03125 | 0.5625” |
| 3/4” (11/16 core) | VN/PLAM + 11/16” MDF/PB + VN/PLAM | .03125 + .6875 + .03125 | 0.75” |
| 3/4” (3/4 core) | VN/PLAM + 3/4” MDF/PB + VN/PLAM | .03125 + .75 + .03125 | 0.8125” |
| 1” lay-up | VN/PLAM + 1” MDF/PB + VN/PLAM | .03125 + 1.0 + .03125 | 1.0625” |
Non-Nominal Thickness Exception
Only 3/4” plywood deviates from nominal — model at 0.73” (always thinner than nominal). All other sheet goods are modeled at their nominal thickness.
PE Usage
The PE creates a Lay-Up Summary document from the PRE codes, listing:
- Material code (Rhino layer name using PRE format)
- Description of materials being glued
- Quantities
This document is stored in the Production Files folder and printed for the Panel Lay-up team.