Computer Aided Drafting (CAD) and Lab

Course Description

Computer Aided Drafting (CAD) and Lab prepares students by teaching them how to generate and interpret computer-aided drawings, while reinforcing technical drawing concepts relevant to the machining field. Instruction centres on SolidWorks software.

Within the SCNS taxonomy, TDR is the Technical Drafting prefix and the leading zero identifies postsecondary adult vocational instruction. Daytona State publishes this at 130 clock hours, offered fall and spring, with PMT0202C as prerequisite.

What distinguishes drafting for machining from architectural drafting is tolerance. A building is dimensioned so that it can be built; a machined part is dimensioned so that it will function and assemble with parts made in a different shop on a different day — which means the drawing has to say not just what size a feature is but how much variation is acceptable and relative to what. That is why geometric dimensioning and tolerancing exists, and it is the part of this subject with the most consequence for whether parts fit.

Learning Outcomes

Required Outcomes

• Navigate CAD software and manage files and templates.
• Create sketches with correct geometry and constraints.
• Apply dimensions and relations to fully define a sketch.
• Create solid features by extrusion, revolution, and sweeping.
• Create cut, hole, fillet, chamfer, and pattern features.
• Model a part from an engineering drawing.
• Edit and rebuild a model and describe feature dependency.
• Build models with a robust and editable feature history.
• Create assemblies and apply mates.
• Check assemblies for interference and fit.
• Generate drawing views from a model.
• Create section, detail, and auxiliary views.
• Apply dimensioning conventions correctly.
• Apply tolerances and describe their effect on manufacture.
• Read and apply geometric dimensioning and tolerancing symbols.
• Establish and interpret a datum reference frame.
• Perform a tolerance stack-up analysis.
• Create bills of material and part numbering.
• Apply drawing standards, title blocks, and revision control.
• Describe machining processes and design for manufacturability.
• Relate drawing information to machine setup and inspection.
• Export files in formats used by manufacturing equipment.
• Check a drawing for completeness and manufacturability.
• Describe file management, backup, and version control.

Optional Outcomes

• Describe sheet metal and weldment modelling.
• Describe surface modelling.
• Describe CAM and the CAD-to-machine workflow.
• Describe additive manufacturing file preparation.
• Describe simulation and finite element analysis at an awareness level.
• Prepare for a SolidWorks certification.

Major Topics

Required Topics

• CAD navigation and file management
• Sketch geometry and constraints
• Fully defining a sketch
• Extrusion, revolution, sweeping
• Cut, hole, fillet, chamfer, pattern
• Modelling from a drawing
• Editing and feature dependency
• Robust feature history
• Assemblies and mates
• Interference checking
• Drawing views from a model
• Section, detail, auxiliary views
• Dimensioning conventions
• Tolerances and manufacture
• GD&T symbols
• Datum reference frames
• Tolerance stack-up
• Bills of material
• Standards, title blocks, revision control
• Machining processes and manufacturability
• Drawings, setup, and inspection
• Export formats
• Drawing checking
• File management and backup

Optional Topics

• Sheet metal and weldments
• Surface modelling
• CAM and the CAD-to-machine workflow
• Additive manufacturing preparation
• Simulation and FEA
• SolidWorks certification

Resources & Tools

• Florida Building Code (floridabuilding.org) — free to view online, including the product approval database; the code you actually draw to.
• Your local building department — permit submittal requirements and local amendments; plans examiners will usually tell you what they look for if you ask.
• The National CAD Standard and AIA layer conventions — the drawing standards employers expect familiarity with.
• Software student licences — AutoCAD, Revit, SolidWorks and others are free for students; install one and use it outside class, because fluency is built in hours.
• Manufacturers' technical literature and details — free, and it is where real detailing conventions are learned.
• Build a portfolio of complete drawing sets — not single sheets. Employers want to see that you can carry a project through.
• SolidWorks certification (CSWA and CSWP) — employers name these in advertisements, and the associate-level examination is achievable directly from a course like this.
• ASME Y14.5 — the geometric dimensioning and tolerancing standard; reading the actual standard is what separates people who can apply GD&T from people who can recognise it.
• Model something real and make it — the fastest way to learn manufacturability is to draw a part, machine or print it, and find out what you got wrong.

Career Pathways

• Architectural and civil drafters — SOC 17-3011.
• Mechanical drafters — SOC 17-3013.
• BIM technician and coordinator — the growth area in this field, and better paid than traditional drafting.
• Construction estimating and quantity take-off — drawing literacy is the core skill.
• Construction project coordination and field engineering.
• Building inspection and plans examination — SOC 47-4011; a common later-career move, and Florida licenses these roles.
• Manufacturing and tooling design support — see this repository's ETD guides.
• Architecture and engineering — ⚠ both are licensed professions requiring accredited degrees; drafting experience is valuable preparation but is not a route to licensure by itself.
• Florida's construction sector is large and cyclical — driven by population growth and storm recovery, and it contracts sharply in downturns. Plan for that.
• CNC programmer and machinist — SOC 51-4012 and 51-4041; the natural pairing with this course given its machining orientation.
• Tool and fixture design — see this repository's ETD2465C guide.
• Quality and inspection — GD&T literacy is exactly what metrology roles require; see ETS4502C.

Special Information

⚠⚠ Model so that it can be changed — because it will be

• A model that produces the right shape and cannot be modified is a failed model, because parts change constantly and someone will have to edit yours.
• ⚠ Fully define every sketch. An under-defined sketch moves when something upstream changes, and the model then produces a different part without anyone noticing.
• Sketch on planes and reference geometry, not on faces, wherever practical — a feature attached to a face breaks when that face is modified or disappears.
• Build in the order a machinist would. A feature tree that mirrors the manufacturing sequence is easier to understand and easier to edit.
• ⚠ Name your features and use meaningful file names. A tree of unnamed extrusions is unreadable to the next person, who is frequently you.
• Keep the design intent explicit. If two holes must always be symmetrical, constrain them symmetrically rather than dimensioning both — the constraint records the intent; two dimensions record only today's numbers.
• Avoid over-constraining and avoid fixing geometry in place.
• ⚠ Manage references between files carefully. Broken external references in assemblies are a common and time-consuming failure — keep the file structure disciplined and back it up.
• Check the model against the drawing before releasing it, and check the drawing against the model after any change.

⚠⚠ Tolerance is where drawings meet reality

• Every dimension needs a tolerance, whether stated on the dimension or by the title block's general tolerance — an untoleranced dimension is not a specification.
• ⚠ Tighter is not better. Tolerance drives cost steeply: a tolerance tightened without a functional reason can multiply the cost of a part for no benefit, and it is one of the most common and expensive drafting habits.
• Tolerance the function. Ask what the feature has to do — fit, seal, locate, clear — and tolerance to that requirement rather than uniformly.
• ⚠⚠ Do the stack-up. Individually acceptable tolerances accumulate, and an assembly that cannot go together is discovered on the shop floor if it is not discovered on paper.
• Geometric tolerancing controls relationships that plus-or-minus cannot express, and the datum reference frame is its foundation — choosing datums badly produces a drawing that is precise, inspectable, and describes the wrong thing.
• Choose datums that reflect how the part functions and mounts, not whichever surface is convenient.
• ⚠ A position tolerance is a circular zone, larger than the square one implied by equivalent plus-or-minus dimensions — so GD&T frequently allows more manufacturing freedom while controlling function better.
• Talk to the machinists and the inspectors. A drawing that cannot be made or cannot be measured will be ignored, and they will tell you which is which before you release it.

⚠⚠ Construction drawings are legal instruments, not illustrations

• A set of construction documents forms part of the contract between the owner and the contractor, and it is what a permit is issued against and what an inspector inspects to. What is drawn is what is owed.
• ⚠ An error on a drawing becomes an error in a building, and it is discovered when something does not fit — at which point it costs orders of magnitude more than it would have on paper.
• Drawings and specifications work together, and where they conflict the contract documents establish which governs. Never assume the drawing settles a question the specification also addresses.
• ⚠⚠ Do not scale from drawings for construction. Written dimensions govern; a scaled measurement from a print that has been reproduced, folded, or resized is unreliable, and this is a standing note on nearly every drawing set for exactly that reason.
• Revisions must be tracked and issued formally. A revision clouded, numbered, and dated is a controlled change; a marked-up print circulating informally is how two trades build to different information.
• ⚠ Work from the current issue. Superseded drawings on a site are a genuine and common cause of rework — check the revision before you build to it.
• Request information rather than assuming. A formal request for information takes days; guessing wrong takes weeks and money.
• ⚠ Sealed drawings carry professional liability. Engineering and architectural documents are sealed by a licensed professional under Chapters 471 and 481, Florida Statutes — a drafter prepares them; a licensee is accountable for them.
• Keep the record set. As-built information is what the next renovation depends on, and its absence is why renovation is expensive.

⚠⚠ This is a PSAV clock-hour course — the published figure is hours, not credits

• The leading zero identifies postsecondary adult vocational (PSAV) instruction, measured in clock hours. Daytona State's catalog displays that figure under a heading reading "Credit Hours" — a rendering artefact. The college credit value of this course is zero.
• PSAV clock hours do not convert to college credit and do not transfer as credit to a degree programme.
• What they produce is a workforce certificate and job-ready skill, which in CAD and machining is directly employable.
• ⚠ Articulation agreements sometimes exist toward a related degree — specific, variable, and to be confirmed in advance.
• Financial aid for clock-hour programmes works differently. Confirm before enrolling.
• Attendance is the currency — hours must actually be completed.

How Florida course levels affect transfer

The first digit of an SCNS number denotes the year of offering, not transferability. Courses at the 1000 and 2000 levels transfer transparently between Florida public institutions, and 3000 to 4000 is unproblematic since both are upper division. The boundary that actually matters is 2000 to 3000, where lower-division credit generally cannot satisfy an upper-division requirement.

TDR0304C is PSAV clock-hour instruction: 130 clock hours and zero college credit, offered fall and spring at Daytona State, with PMT0202C as prerequisite.

Pursue the SolidWorks CSWA certification alongside it — employers ask for it by name.