Selecting Low-Cost 2D CAD Software for Hobby Machining Projects

Hobby machinists and instrument makers who design parts such as bagpipe chanter bores, instrument bells, custom adapters, and small fixtures need a 2D CAD package that is affordable, easy to learn, and capable of handling the two operations that most differentiate hobby work from production drafting: smooth curve fitting through measured probe points, and the generation of revolved cross-sections for round parts. Free and low-cost options under $100 now cover nearly every requirement of the home workshop, but they differ significantly in how they expose coordinate data, how they handle NURBS curves, and how they integrate with downstream CAM or manual CNC workflows.

This technical reference compares the leading low-cost 2D CAD packages used by hobby machinists in the United States and Europe, including DeltaCAD, Solid Edge 2D Drafting (Siemens), DesignCAD, ViaCAD 2D/3D (PunchCAD), and ActCAD/TrueCAD. Each entry is evaluated against a fixed requirement list that hobby machinists actually use: instant point coordinate readout, NURBS or spline fitting through imported bore measurements, revolved surface support, DWG compatibility, and learning curve for non-professional users.

Functional Requirements for Hobby Machining CAD

A hobby machinist's CAD workload differs from a production designer's in three measurable ways. First, the input geometry is often empirical rather than designed. Bore measurements taken with soft probes, dial indicators, or 3D-printed contour gauges produce a list of radius-versus-depth points that must be converted into a smooth curve before any G-code can be written. Second, the output is a 2D working drawing with explicit X/Y coordinates for every feature, not a parametric model. A DRO-equipped manual mill or a conversational CNC expects numbers, not dimensions chasing across the print. Third, the revolved surface of a turned part is the most common single operation; bagpipe chanters, recorder bores, telescope tubes, and pen blanks are all solids of revolution described by a single 2D profile.

These three requirements collapse to a short feature checklist:

• Instant X/Y coordinate readout for any selected point, vertex, intersection, or hole center.
• NURBS or higher-order spline fitting through an imported set of measured points.
• Revolved surface or swept profile generation from a 2D sketch.
• DWG/DXF import and export to exchange data with CAM packages and other CAD users.
• Low or zero cost, with a single-payment license rather than a subscription.
• Short learning curve for users who are machinists first and draftsmen second.

The packages reviewed below were selected because at least one hobby machinist in independent field use has reported success with the tool on the specific requirement set above. Pricing is the manufacturer's published retail or direct-download price; promotional and academic discounts are not included.

Feature Comparison Matrix

The matrix above is a snapshot, not a benchmark. Each package has been updated since these prices were published; check the vendor's site for the current SKU and the bundled feature set. The key discriminators are not price or platform alone but the combination of NURBS handling, revolved surface generation, and the granularity of the coordinate readout.

DeltaCAD: Coordinate-First Drafting

DeltaCAD is a Windows-native 2D drafting program sold as a perpetual one-time license at the $50 price point. It occupies a specific niche that no other low-cost package occupies well: it exposes the X/Y coordinate of any point on a drawing with a single click, and it allows the entire drawing to be translated so a selected feature sits exactly at the origin. For a machinist programming a manual CNC or writing G-code by hand, this eliminates the arithmetic step that consumes most of the programming time on a conventional print.

The coordinate workflow is the package's defining feature. Selecting a point, vertex, hole center, line/line intersection, line/arc intersection, or arc/arc intersection produces a readout of the exact X and Y values relative to the drawing origin. The user can then select all entities, issue a move command, type in the negative of the current origin coordinates, and shift the entire drawing to align the chosen feature with 0,0. From that point, every other coordinate on the print is reported relative to the logical base corner, which is the format expected by a CAM post-processor or a manual CNC operator using a DRO.

For NURBS-style work, DeltaCAD supports polyline smoothing and cubic spline curves through user-specified points. The workflow for bore data is to enter the radius-versus-depth points as a polyline, then convert the polyline to a smoothed spline. The result is a 2D curve that approximates the measured bore profile closely enough for turning and reaming operations, though the smoothing is C2-continuous at best and does not match the true NURBS fidelity of a professional modeler. Revolved surface generation is not native; the 2D profile must be exported as DXF and processed in a separate CAM or 3D package if a solid of revolution is required.

Solid Edge 2D Drafting: Free Production-Proven Tool

Siemens' Solid Edge 2D Drafting is the free 2D-only member of the Solid Edge family, historically distributed as a stand-alone download from the Siemens PLM Velocity program. The package includes a full DWG-compatible drafting engine, with native support for ISO, ANSI, BSI, DIN, JIS, and UNI drafting standards, and ships with a Command Finder utility that maps AutoCAD command names to Solid Edge equivalents. For a hobby machinist migrating from AutoCAD, this is a meaningful productivity feature.

The functional capability of Solid Edge 2D Drafting is comparable to AutoCAD LT for the specific operations a hobby user needs. B-spline and NURBS curve creation is first-class, with the same spline editing tools found in the full Solid Edge 3D package. Dimensioning, constraint solving, and paper/model space layout behave like a production drafting tool rather than a stripped-down viewer. The coordinate readout is via the standard Inquiry command, which reports the X/Y of any selected entity in the units of the active drawing.

Two practical constraints apply. First, Solid Edge 2D Drafting was originally a Windows XP/Vista build, and later versions support Windows 7 and 10. Native Windows 11 support depends on the specific release; check the Siemens download page for the current compatibility statement. Second, the free download requires a Siemens account registration, and the free 2D license is a separate SKU from the paid Solid Edge 3D bundles. The free Viewer is bundled with the 2D Drafting download for users who only need to inspect drawings.

Revolved surface generation is not part of the 2D package; users who need a true solid of revolution must export the 2D profile to DXF and import it into a free mesh modeler such as FreeCAD, or upgrade to the Solid Edge Community Edition for students and hobbyists, which includes the full 3D modeler at no cost.

DesignCAD and ContourCAM: Machinist-Oriented Bundles

DesignCAD is published by IMSI Design and ships in two configurations: the 2D-only package at $49.95 and the 3D MAX package at $99.95. The 3D MAX package includes revolved surface, swept, and lofted solid creation, which covers the bore-profile workflow end to end. Both packages include spline fitting through user-defined points and a query command that returns the X/Y of any selected entity.

The ContourCAM plugin is a DesignCAD add-on that converts 2D profiles and 3D solids into G-code. For a hobby user who already owns DesignCAD 3D MAX, the plugin removes the need to import DXF into a separate CAM package such as Fusion 360 or FreeCAD, which simplifies the workflow for one-off parts. ContourCAM supports 2-axis and 2.5-axis milling, which is sufficient for drilling, pocketing, and profiling of flat and prismatic parts; 4-axis and 5-axis simultaneous milling are not in scope at the hobby price point of any package reviewed here.

DesignCAD's documentation and tutorial library are aimed at the entry-level user. The ribbon UI is similar to recent AutoCAD releases, which shortens the learning curve for users who have seen AutoCAD in a school or shop environment. The DWG/DXF read/write path is mature and round-trips cleanly with AutoCAD-format files, which is the lingua franca of the hobby CAM ecosystem.

ViaCAD 2D/3D: Cross-Platform Drafting

ViaCAD 2D and ViaCAD 2D/3D are published by PunchCAD and are unusual in the low-cost CAD market because they ship in native macOS builds in addition to Windows. For a hobby machinist running a Mac-based design station, ViaCAD is one of the few DWG-compatible packages under $130 that does not require a Windows VM or Boot Camp partition. The 2D package is priced at $99; the 2D/3D bundle adds revolved surface, sweep, and loft operations.

NURBS support in ViaCAD is at the same level as mid-range professional packages, with the same spline editing tools (insert/delete knot, change degree, control point manipulation) found in Rhino and the Solid Edge 3D modeler. This makes ViaCAD a good fit for the bore-data workflow: import a CSV of radius-vs-depth points, place a polyline through them, convert to a NURBS curve, edit the control polygon to fine-tune the fit, and revolve the result into a solid of revolution. The combination of native NURBS editing and revolved surface generation in a single $99–$129 package is rare at this price point.

Documentation is a strength; the package includes a substantial set of built-in tutorials and an indexed PDF manual. For a hobby user who is not a professional CAD operator, this is the single largest factor in the learning curve. The macOS and Windows builds are feature-parity, with identical file format and identical keyboard shortcuts, which is helpful for users who switch between platforms.

ActCAD and TrueCAD: DWG-Native Budget Drafting

ActCAD and TrueCAD are published by separate corporate entities in the same Hyderabad, India-based engineering group, and the two products share a substantial code base. Both are DWG-native (AutoCAD-compatible) drafting packages with optional 3D bundles that include revolved surface generation. The 2D-only Standard editions are priced in the $99–$179 perpetual range, with the 3D Professional editions higher.

For hobby machinists, the practical value of these packages is the AutoCAD command and DWG format compatibility. A hobby user who receives drawings from a professional engineer, a CNC machinist, or a maker-space can open and edit them in ActCAD or TrueCAD without the DWG conversion friction that affects packages that use a proprietary 2D format. The NURBS and spline tools are capable of the bore-data workflow, and the coordinate readout is via the standard List/ID commands familiar to AutoCAD users.

The decision between ActCAD and TrueCAD is largely a question of license model and support channel. ActCAD ships with optional annual maintenance that includes updates; TrueCAD's licensing is similar. For a hobby user who only needs the package for personal projects and does not expect version updates, the Standard perpetual license is the right SKU. For a small professional shop that needs a maintained build and a support contract, the Professional edition with maintenance is the appropriate choice.

NURBS Splining for Measured Bore Data

The defining challenge in hobby bore design is converting a list of measured radius-versus-depth points into a smooth, machinable curve. The data typically comes from a soft probe (a piece of soft solder or lead that conforms to the bore and is then measured with a micrometer), a set of telescoping gauges, or a 3D-printed contour gauge read with calipers. The output is a table of (depth, radius) pairs, often with measurement noise on the order of ±0.005 inch for a 0.5-inch bore.

The NURBS fit workflow has three stages. First, enter the data points as a 2D polyline in the CAD package, with depth on the X axis and radius on the Y axis. Most low-cost packages accept point-by-point entry or DXF import of a polyline. Second, convert the polyline to a NURBS or higher-order spline. The package's curve-fitting algorithm interpolates the points and produces a C2-continuous curve. Third, edit the control polygon to reduce noise. The number of control points is set to roughly one-third the number of data points; fewer control points smooth out measurement noise at the cost of geometric fidelity, and more control points preserve the bore shape at the cost of carrying the noise into the machined result.

A practical rule: for a chanter bore of 10 to 20 measured points along a 6-inch length, start with a NURBS curve of degree 3 with 5 to 7 control points. Compare the curve against the raw data points using the package's distance-measurement tool. If the maximum deviation exceeds 0.010 inch, increase the number of control points. If the maximum deviation is under 0.003 inch and the curve shows visible waviness from measurement noise, reduce the number of control points. The NURBS curve is then ready to be revolved into a 3D solid for visual inspection or exported as DXF for CAM.

Revolved Surface Workflows for Bore Profiles

Once the 2D bore profile is fitted, the next step is to generate a solid of revolution for visual inspection, interference checking, and CAM output. In packages that support revolved surfaces natively (DesignCAD 3D MAX, ViaCAD 2D/3D, Solid Edge Community Edition, ActCAD/TrueCAD 3D bundles), the workflow is identical: select the 2D profile, specify a rotation axis (the centerline of the bore), specify a rotation angle (360 degrees for a closed bore), and the package generates the solid.

For packages that do not support revolved surfaces (DeltaCAD, Solid Edge 2D Drafting, DesignCAD 2D-only), the workflow is to export the 2D profile as DXF and import it into a free 3D modeler. FreeCAD is the standard choice for hobby users because it is open-source, supports the same DXF file format, and ships with a Part workbench that includes a Revolve feature. The resulting solid can be exported as STL for 3D printing, as STEP for export to commercial CAM, or as DXF slice contours for lathe programming.

The axis of revolution is the bore centerline, which is conventionally the Y axis in a 2D depth-versus-radius sketch. The 2D profile extends from depth=0 at one end to depth=L (the bore length) at the other, with the radius increasing or decreasing as a function of depth. The resulting solid is a closed bore of length L, with internal radius defined by the NURBS curve and external radius defined by the 2D profile's outer boundary. For a chanter, the outer boundary is typically a straight cylinder; for a recorder head, it is a tapered or stepped cone.

Coordinate Readout and Manual CNC Programming

The single most-valued feature among hobby machinists using low-cost CAD is the ability to read the X/Y coordinate of any point on the drawing with a single command. Manual CNC programming, whether for a Tormach, a Sherline, a Pocket NC, or a hobby converted mill, expects an ASCII list of X/Y coordinates in sequence, one line per move. The CAM package generates this list from the 2D profile; the machinist verifies it by reading the X/Y values directly from the CAD drawing and comparing them to the G-code output.

In DeltaCAD, this is a one-click operation. In Solid Edge 2D Drafting, the Inquiry > ID command returns the coordinate of any selected point. In DesignCAD, the Point Query command returns the same. In ViaCAD, the Coordinate Readout tool returns the point coordinate. All four packages support coordinate readouts in user units (inches or millimeters) with selectable precision (typically 4 decimal places).

For a hobby user writing G-code by hand from a 2D drawing, the workflow is: import the bore data into the CAD package, fit the NURBS curve, set the origin at the bore mouth (depth=0, radius=0), read the X/Y of the curve at 0.1-inch intervals from depth=0 to depth=L, and enter these values as the X coordinate (depth) and Y coordinate (radius) of a series of G01 moves in the G-code file. The Z coordinate (cut depth) is held constant or stepped based on the lathe or mill configuration. The result is a hand-written G-code file that matches the bore profile to within the NURBS fit accuracy, typically 0.001 to 0.005 inch.

Platform and Operating System Considerations

The platform matrix for low-cost 2D CAD is heavily Windows-dominated. DeltaCAD, Solid Edge 2D Drafting, DesignCAD, ActCAD, and TrueCAD are Windows-only. ViaCAD is the only package reviewed that ships a native macOS build at the same price point. Linux users have no commercial options in this price band; the practical choice is FreeCAD on Linux, which is open-source and runs natively, with the trade-off of a steeper learning curve and a less polished UI than the commercial packages.

Windows version compatibility has shifted over the years. Solid Edge 2D Drafting was originally a Windows XP/Vista build and has been updated for Windows 7 and 10. Windows 11 support depends on the specific release; consult the Siemens download page for the current compatibility matrix. DeltaCAD and DesignCAD support current Windows versions including 11. ViaCAD's Windows build supports Windows 10 and 11.

For a hobby user running a Mac as the primary design station and a Windows PC as the CAM station, the practical workflow is: design in ViaCAD on the Mac, export the 2D profile and revolved solid as DXF and STEP respectively, transfer the files to the Windows PC, and run the CAM package (FreeCAD, Fusion 360 personal use, or a commercial CAM package) to generate G-code. This dual-platform workflow is well-supported by the file format interoperability of the DWG/DXF/STEP standards.

Selection Criteria and Final Recommendations

For a hobby machinist whose primary need is the bore-design workflow (NURBS fit + revolved surface + coordinate readout), the recommendation order depends on budget.

Zero budget: Solid Edge 2D Drafting is the strongest choice. It is free, it is production-proven, it supports NURBS and DWG natively, and it ships with an AutoCAD command finder. The trade-off is the requirement to register a Siemens account and the Windows-only platform. For 3D revolve, export the 2D profile to FreeCAD and use the Part workbench Revolve feature; this is a two-package workflow but both packages are free.

$50 budget: DeltaCAD is the right choice for a hobby user who programs manual CNC or a DRO-equipped mill and values the instant coordinate readout above all other features. The package lacks native revolved surface support, but the coordinate workflow is the fastest in the price band, and the DXF export is clean for downstream CAM.

$100 budget: DesignCAD 3D MAX or ViaCAD 2D/3D. DesignCAD 3D MAX includes ContourCAM as a separate plugin purchase, which closes the loop from 2D profile to G-code in a single vendor stack. ViaCAD 2D/3D is the right choice for a Mac user, with first-class NURBS support and revolved surface generation in a single $99–$129 package. The macOS-native build is the deciding factor if the design station is a Mac.

$150–$200 budget: ActCAD or TrueCAD Professional with the 3D bundle. The DWG-native format, the AutoCAD-compatible command set, and the revolved surface support are the right combination for a hobby user who collaborates with AutoCAD-trained designers or machinists and needs a maintainable build with a support contract.

For a hobby user who is just starting out and is unsure which workflow will dominate, the recommended first step is to download Solid Edge 2D Drafting and FreeCAD, fit one bore profile, and produce one revolved solid. The total cost is $0, the learning curve is manageable, and the workflow maps directly to the requirements of the hobby machining community. If the coordinate readout is the bottleneck, upgrade to DeltaCAD. If the revolved surface is the bottleneck, upgrade to ViaCAD 2D/3D. If the collaboration with AutoCAD users is the bottleneck, upgrade to ActCAD or TrueCAD.