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newSchoolWorks.com › VoTechWorks › Manufacturing & Marine › Drafting / CAD / BIM › SolidWorks Parametric Solid Modeling for Manufacturing and Marine Applications › Lesson 11
MFG-DRAF17-04 · Lesson 11 · 10 clock hours · practice

CSWA Exam Simulation and Mass Properties Strategies

Objective. Students will complete timed CSWA-format part-modeling and assembly challenges, applying mass-properties verification strategies to achieve answer accuracy within the exam's accepted tolerance.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed engineer or certified journey-level tradesperson or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

VoTechWorks program approval and accreditation are still in progress. Credentials are issued only by the certifying bodies named in each program, after their own exams.

CSWA Exam Overview

The Certified SolidWorks Associate (CSWA) exam is issued by Dassault Systèmes and administered through Certiport. It is a timed, proctored exam that tests your ability to build parts and assemblies in SolidWorks and to extract accurate mass-property data from your models. Passing the CSWA demonstrates to employers in manufacturing, marine fabrication, and related industries that you can work productively in SolidWorks from day one.

The exam presents multiple-choice questions where the answer choices are numerical values. This format means a small modeling error — a wrong sketch dimension, a missed fillet, or an incorrect material assignment — will send you to a wrong answer choice. Precision is not optional; it is the entire point.

Consult the official CSWA Exam Guide from Dassault Systèmes for the current question count, time limit, and passing score, as these details are updated periodically. As a general benchmark, budget your time so that you spend roughly equal time on part-modeling questions and assembly questions, and reserve a few minutes at the end for verification.

Question Types and What They Test

Part-modeling questions give you a dimensioned drawing or a written description of a part. You build the part in SolidWorks, assign the specified material, and then read a mass-property value — most commonly mass, volume, surface area, or the coordinates of the center of mass — from the Mass Properties tool. The answer you select must fall within the tolerance window stated in the exam guide.

Assembly questions give you a set of parts and mating instructions. You assemble the parts correctly, then again query mass properties for the whole assembly or for a specific component.

Basic theory questions (if present in the current exam version) cover foundational concepts such as sketch relations, feature types, and design intent. Review the official guide to confirm which topic areas appear.

Mass Properties: The Core Skill

The Mass Properties tool (Evaluate → Mass Properties) is the single most important tool for CSWA success. Before you open the exam, you should be able to access and read it in under ten seconds.

Key habits for exam day:

1. Assign material first. Right-click the part name in the FeatureManager, choose Material, and apply the specified material before you begin modeling. The material controls density, which controls mass and volume calculations.

2. Read to four decimal places. The exam expects answers reported to at least four decimal places. SolidWorks displays this precision by default in the Mass Properties dialog; do not round prematurely.

3. Check units. Confirm your document units (Tools → Options → Document Properties → Units) match the units stated in the question (usually millimeters–grams–seconds or inches–pounds–seconds). A units mismatch is one of the most common causes of wrong answers.

4. Use the Output Coordinate System field. For center-of-mass questions, confirm which coordinate system the question references. If the question specifies the default coordinate system, leave the field set to default.

5. Verify with a rebuild. Press Ctrl+Q to force a full rebuild before reading mass properties. This eliminates stale geometry that can produce incorrect values.

Time Management Strategy

Annotate your exam guide copy with personal time benchmarks during practice. A common approach:

Error Analysis: Learning from Misses

When a practice answer is wrong, isolate the cause before moving on. Common culprits:

Document each error in your lab log: state what you modeled, what value you got, what the correct value was, and the specific change that fixes the model. This written record accelerates your improvement between practice sessions.

Workplace Safety Reminder

This lesson takes place entirely at a CAD workstation. Ergonomic discipline matters for sustained concentration: adjust monitor height so the top of the screen is at or slightly below eye level, keep wrists neutral on the keyboard and mouse, and take brief stretch breaks between timed sets. Report any electrical hazards (frayed cables, sparking outlets) to your instructor immediately — do not attempt to repair electrical equipment yourself. Follow your school's posted emergency procedures if any incident occurs.

Key terms8

CSWACertified SolidWorks Associate — an industry credential from Dassault Systèmes that validates foundational SolidWorks part-modeling and assembly skills, administered through Certiport.
Mass Properties toolA SolidWorks evaluation tool (Evaluate → Mass Properties) that reports mass, volume, surface area, center of mass, and moments of inertia for a part or assembly based on its geometry and assigned material.
Material assignmentThe step of attaching a specific material (such as AISI 1020 Steel or 1060 Alloy aluminum) to a SolidWorks part so that the software can calculate accurate density-dependent properties.
Parametric modelingA CAD approach in which part geometry is driven by editable dimensions and relations, so that changing a value automatically updates all dependent features.
Tolerance windowThe range of acceptable answers around the exact correct value within which the CSWA exam will accept a student's response; specified in the official exam guide.
Coordinate systemA reference frame defined by origin point and X, Y, Z axes used by SolidWorks to report center-of-mass coordinates; exam questions may specify the default or a named coordinate system.
Full Rebuild (Ctrl+Q)A SolidWorks command that forces every feature in the model to recalculate from scratch, ensuring that mass-property readings reflect the current geometry rather than cached data.
FeatureManager Design TreeThe hierarchical panel in SolidWorks that lists every sketch, feature, and reference in the order they were created, used for auditing and editing model history.

Worked examples4

1. A CSWA practice question asks: 'A solid rectangular block measures 80 mm × 50 mm × 30 mm and is made of AISI 1020 Steel (density 7,900 kg/m³ as listed in SolidWorks). What is the mass of the part in grams, to four decimal places?' Calculate the expected answer so you can verify your SolidWorks result.
  1. Step 1 — Calculate volume in cubic millimeters: V = 80 × 50 × 30 = 120,000 mm³.
  2. Step 2 — Convert volume to cubic meters: 1 mm³ = 1 × 10⁻⁹ m³, so V = 120,000 × 10⁻⁹ m³ = 1.2 × 10⁻⁴ m³.
  3. Step 3 — Calculate mass in kilograms: m = density × volume = 7,900 kg/m³ × 1.2 × 10⁻⁴ m³ = 0.948 kg.
  4. Step 4 — Convert to grams: 0.948 kg × 1,000 = 948.0000 g.
  5. Step 5 — In SolidWorks, assign AISI 1020 Steel, check that document units are millimeters and grams, run Mass Properties, and confirm the displayed mass matches 948.0000 g within the exam tolerance.
Answer: 948.0000 g (verify against SolidWorks output; any discrepancy indicates a units or material error)
2. You model a part and SolidWorks reports a mass of 1,234.5678 g, but the answer choices on the practice exam are 1,234.5678 g, 1,087.3412 g, 2,156.9900 g, and 987.1100 g. Your result matches choice A exactly. However, you want to verify you did not accidentally use the wrong material. The question specifies 6061 Alloy aluminum (density approximately 2,700 kg/m³ in SolidWorks). If the volume of the part is 457,243 mm³, is 1,234.5678 g a plausible answer for aluminum?
  1. Step 1 — Convert volume to cubic meters: 457,243 mm³ × 10⁻⁹ = 4.57243 × 10⁻⁴ m³.
  2. Step 2 — Calculate expected mass in kg: m = 2,700 kg/m³ × 4.57243 × 10⁻⁴ m³ = 1.23456 kg (approximately).
  3. Step 3 — Convert to grams: 1.23456 kg × 1,000 = 1,234.56 g.
  4. Step 4 — Compare: the hand-calculated estimate of ~1,234.56 g is consistent with the SolidWorks result of 1,234.5678 g, confirming the material and volume are correct.
Answer: Yes — the result is plausible. The hand calculation confirms the correct material was applied.
3. A practice part question specifies: base cylinder, diameter 60 mm, height 40 mm; then a concentric through-hole, diameter 20 mm, through the full height. Material: Plain Carbon Steel (density 7,858 kg/m³ in SolidWorks). Calculate the expected mass in grams to four decimal places.
  1. Step 1 — Calculate volume of the solid cylinder: V_cyl = π × (30 mm)² × 40 mm = π × 900 × 40 = 113,097.3355 mm³.
  2. Step 2 — Calculate volume of the hole: V_hole = π × (10 mm)² × 40 mm = π × 100 × 40 = 12,566.3706 mm³.
  3. Step 3 — Net volume: V_net = 113,097.3355 − 12,566.3706 = 100,530.9649 mm³.
  4. Step 4 — Convert to cubic meters: 100,530.9649 × 10⁻⁹ = 1.00531 × 10⁻⁴ m³.
  5. Step 5 — Calculate mass in kg: m = 7,858 kg/m³ × 1.00531 × 10⁻⁴ m³ = 0.79997 kg (approximately).
  6. Step 6 — Convert to grams: ≈ 799.97 g. In SolidWorks, assign Plain Carbon Steel, confirm units, build the boss-extrude and extruded cut, run Mass Properties, and confirm the displayed value matches this estimate within tolerance.
Answer: Approximately 799.97 g — confirm exact four-decimal result in SolidWorks; hand calculation validates order of magnitude and material.
4. During a timed practice set you finish a part model and the Mass Properties tool reports mass = 2,418.7733 g. The four answer choices are 2,418.7733 g, 2,418.7700 g, 2,418.8000 g, and 2,419.0000 g. You need to decide which choice to select.
  1. Step 1 — Read the exam guide tolerance. The guide specifies an accepted range (for example, ±1% or a fixed decimal tolerance). Identify the window that applies.
  2. Step 2 — Check whether your SolidWorks value of 2,418.7733 matches choice A exactly — it does.
  3. Step 3 — Evaluate whether any other choice falls within your tolerance window of the reported value. Choices B (2,418.7700), C (2,418.8000), and D (2,419.0000) are all close, but your SolidWorks output matches choice A to four decimal places.
  4. Step 4 — Select the choice that exactly matches your SolidWorks output when an exact match exists. If no exact match exists, select the choice closest to your output that falls within the stated tolerance.
Answer: Select A: 2,418.7733 g — exact match to SolidWorks output takes priority.

The math in this lesson2

Learners multiply volume by density to find part mass and match it to answer choices.
G-MG.2G-GMD.3
Brush up in the math halls at newSchoolWorks.com:
In class: Instructor reviews the CSWA exam structure, question types (multiple-choice with numerical answers), timing, and scoring using the official Certiport/Dassault Systèmes CSWA exam guide; students annotate their own copy with key time benchmarks per question type. · Timed practice set: students complete five CSWA-style part-modeling questions (30 minutes) using provided dimensioned sketches, recording mass property answers to four decimal places as required by the exam format. · Debrief and error analysis: students compare answers against the key, identify which feature caused the discrepancy for any missed question, and write a one-paragraph correction plan in their lab log documenting the modeling error and fix.
Materials: SolidWorks 2024, official CSWA Exam Guide (Dassault Systèmes), CSWA practice problem set (instructor-compiled from published sample questions), scientific calculator, lab log notebooks
Check: At least four of five practice questions answered correctly within tolerance specified in the CSWA guide — student self-grades against answer key and instructor spot-checks; pass requires 80% correct.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

SolidWorks part modeling — mass properties
1. Which SolidWorks tool should you use to find the mass of a finished part before selecting an answer on the CSWA exam?
SolidWorks part modeling — material properties
2. A CSWA question specifies 6061 Alloy aluminum but you accidentally applied Plain Carbon Steel to your part. Compared to the correct answer, your reported mass will be:
SolidWorks part modeling — model verification
3. Before reading mass properties at the end of a complex part model, you should press Ctrl+Q. What does this command do?
SolidWorks part modeling — mass properties
4. A CSWA exam question asks for the center-of-mass X coordinate and specifies 'relative to the part origin.' You have created a custom coordinate system for a previous step. What should you do before reading the value?
SolidWorks part modeling — troubleshooting
5. You complete a practice part in 8 minutes and your mass result does not match any of the four answer choices. Which audit step should you perform first?
CSWA exam strategy
6. For CSWA exam answers, mass-property values should be recorded and compared to answer choices to at least how many decimal places?
SolidWorks part modeling — geometry and mass properties
7. A solid cylinder has a diameter of 40 mm and a height of 25 mm. A concentric through-hole of diameter 10 mm is cut through the full height. Which expression correctly gives the net volume of the part?
SolidWorks part modeling — troubleshooting and error analysis
8. During error analysis after a practice set, a student finds their mass answer was too low by approximately one-third of the correct value. The most likely cause is:
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