10 Milling Toolpaths for Your First 2D CNC Machining Project

Marti Deans June 28, 2018

11 min read

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Is that part you just machined within tolerance? It’s either a yes or no answer in the world of manufacturing. Machining precision requires considering some complex variables, including the size of your features, what tools you have, and the capabilities of your machine. All of these variables come together with the help of toolpaths to successfully produce parts within tolerance. This article will focus on how to plan your first 2D machining project with 10 CNC milling toolpaths. Learn more about the Fusion 360 Machining Extension here.

CNC Milling Toolpaths at a Glance

CNC milling toolpaths are typically categorized as 2D, 3D, 4-axis, and 5-axis. However, the term 2D is a bit misleading since this toolpath uses the Z-axis to position a tool for depth. For example, in the image below, we have a prismatic part whose features all reside at various heights on the XY plane. We can quickly position our tool to depth on the Z-axis and then machine a feature by moving in X and Y.

2D prismatic part diagram

Many new CNC machinists struggle to plan out their toolpaths, especially as features get more complex. Sometimes this problem-solving process is clear. Pockets use a 2D Pocket operation, chamfers use Chamfer Milling, and so on.

But then you get to the difficult questions that don’t have such black and white answers. How are you going to machine the hole in the center of the part above? You could use a drill, contour, or circular pocket toolpath. And which of these features needs to be machined from the top versus the bottom? The answer to these questions requires some fundamental toolpath knowledge.

Toolpath Types and Terminology

Every toolpath has a unique behavior and use case. Familiarize yourself with the toolpaths below, which you’ll encounter in Fusion 360 and other CAM solutions.

ToolpathUses
FaceFinishing the face of a part.
ContourMachining loops, open pockets, stick fonts, dovetails, keysets, or saw cuts.
ChamferDeburring and creating chamfers using either a tapered mill or center drill.
FilletCreating fillets using a Corner Rounding Tool.
PocketRoughing or finishing pockets of various shapes and sizes.
Slot MillMachining straight slots or arc slots.
DrillCreating spot drill, tapped, bore, or reamed holes.
BoreMaking holes, typically greater than .75in diameter.
Thread MillMachining ID threads over .75in diameter, milled OD threads of any size, or custom threads.

There is also some toolpath lingo that you’ll want to get acquainted with. You’ll find the terms below referenced in nearly every CAM software package.

Examples of 2D face and shoulder milling

All of these terms and toolpath types come together in the planning of a 2D machining process. Check out the example below for how we might plan out the machining of a simple prismatic part.

2D machining features
StepToolpathComments
1FaceRoughs and finishes to the highest flat surface of part.
22D ContourMachines the outside of the part.
32D ContourMachines outside of circular boss.
42D PocketRoughs and then finishes the circular pocket.
5Slot MillMills the arc slots.
6Circular Pocket MillMachines the center through holes. Depending on size, a drill could also work here.
7ChamferUses a 2D contour and chamfer mill to create 45° angle.
8FilletUses 2D contour and corner round tool to make fillet.
9Spot DrillPre-drills holes to prevent drill drift and to make a chamfer.
10DrillMachines holes.
11Circular Pocket MillMachines counterbore.

Cutter Diameter Compensation (CDC)

CDC adjusts a toolpath to account for tool wear that can cause inaccuracies in a part. This will basically align your tool either slightly to the left or right of the originally programmed toolpath. You can find your compensation value by subtracting actual dimensions from desired dimensions of a part feature.

2D cutting diameter diagram

We always recommend activating CDC while the tool is away from the part. This will allow the angled movement of CDC to kick in fully before making contact with your material. Correctly implementing CDC to machine 2D features accurately is an important part of a successful machining practice. Check with your machine control and CAM software to make sure you understand how to enter the compensation value.

The 10 Milling Toolpaths You’ll Need to Use

The plan that was just laid out uses 10 different milling toolpaths. Knowing how to use each one and understanding their limitations is the key to machining success. In the sections below, we’ll be covering each toolpath in detail, along with some guidelines to consider.

1 – Facing

You’ll use facing at the start of your machining process to remove any excess material down to the topmost flat face of a part. We recommend using a Face Mill for most parts. This will provide the highest rates of material removal.

You’ll want to start your toolpath with just enough distance from the part, so the face mill doesn’t plunge into the stock material. The distance from the center of the tool should be the tool radius plus some clearance.

We recommend planning your roughing passes based on stock material cuts that can vary in thickness by up to .05 inches. Basically, plan for the worst-case material size with maximum height and additional roughing passes. This will ensure that your tool doesn’t meet too much material at once, which often results in breakage.

2D facing toolpath diagram

2 – 2D Contouring

2D contouring is used to rough and finish the outside walls of a part. Consider using cutter diameter compensation (CDC) for high tolerance features to help account for tool wear and material deflection. If you do decide to use CDC, start the toolpath off the part so CDC can be fully engaged before contacting the material.

For machining walls, be sure to extend the cutting depth of full walls a little below the bottom wall without cutting into the machine table or vise jaws. This way, when you are removing stock from the backside of the part, there is no need to try to align another contour with the previously machined features, which can be difficult and inaccurate. Also, consider taking a full-depth finish pass on tall walls. This will ensure the walls are straight and not tapered.

It’s always a good practice to leave a consistent stock allowance when roughing your part’s walls. This will ensure the finish pass removes a consistent amount of material, help produce an even cutting pressure on the tool, and improve part accuracy.

2D Contour diagram

3 – Pocketing

Pocketing can be used to remove excess material from any shaped pocket, such as from the spiral pocket below.

2D Pocket diagram

When doing rough pocketing passes, we recommend leaving a constant thickness on the walls and floor of the pocket. These can then be evenly removed by a finishing process.

Special roughing end mills with serrations to break up chips are among the best tool types for removing material. However, they do produce a poor finish when compared to standard end mills. A final finish pass with a standard or finishing end mill will improve the surface finish.

If space allows it, use a helical motion when plunging into a pocket. If this isn’t possible, you can use a Center-cutting End Mill or drill a pilot hole and use that as an entry point to plunge into. Be sure to check with your tool manufacturer for the best feeds and speeds for plunge milling.

Lastly, when planning your toolpath, start near the center of the pocket and exit in a counter-clockwise direction. The tool will use climb milling while machining the pocket, which offers better cut conditions on rigid CNC machines.

4 – Slot Milling

Slots can be machined with various methods, including contouring, pocketing, or specialized slot milling operations. We recommend always using a tool smaller than the slot’s width to maximize material removal and ensure adequate chip evacuation. When planning your toolpath, a ramp plunging move will provide the best results.

2D Slot Milling diagram

5 – Bore

Bore toolpaths use a spiral motion to cut circular features like holes greater than 0.75in in diameter or circular bosses. The toolpath’s slow step-down keeps the tool constantly engaged while not overloaded and results in an even surface finish.

6 – Chamfer Milling

Chamfer milling is great for finishing 2D features. One of the most common workplace injuries in job shops is cuts on hands while removing parts from the machine. Breaking sharp edges with a chamfer helps keep hands cut free and operators safe and productive. 

Here is a recommended formula for setting the depth of cut:

(tool_radius – tool_tip_radius) – chamfer_width – clearance

This formula will keep the cut off the tool’s tip, which gives better cut conditions leading to longer tool life and better surface finish. The clearance value will keep the cut from going past the outer diameter of the tool. Ensure your tool radius is large enough to leave some space on either side of the cut, so you aren’t cutting directly at the outer diameter or the tip diameter.

2D Chamfer Milling diagram

7 – Radius Milling

Radius milling uses a 2D Contour-like toolpath to produce an external fillet. Using the 2D toolpath requires a Radius Mill, but you can accomplish similar results with a Ball Mill and 3D contour toolpath.

2D Radius milling diagram

8 – Spot Drilling

You can use center drilling to create a conical shape on the face of your part. Center drills are usually shorter and thicker than standard twist drills, so they create accurate cones that will help keep later drills centered during their operation and prevent them from “walking” or moving across the part’s surface. When planning a conical cut, we recommend spot drilling deep enough to match the diameter of the final drilled hole. If you want a chamfer on the final hole, spot drill a bit larger than the diameter of the drill.

2D center drilling diagram

9 – Drilling

Drilling will quickly create holes by removing material vertically. Drilled holes can be left as simple through holes, countersunk, counterbored, or tapped. A Peck Drill cycle can be used for deeper holes which will retract the tool slightly to break the chip, aiding chip evacuation and minimizing tool breakage.

2D drilling diagram

When configuring your CNC program, be sure to know the desired end condition for each hole. If it is a through-hole, drill deep enough to clear the drill tip as it plunges through stock. You’ll also want to include a breakthrough allowance to prevent flanging or burring.

10 – Tapping

Tapping created threads in previously drilled holes by coordinating feeds and speeds with thread lead. Your CAM setup will calculate feed rates based on cutting speed and threads per inch (TPI) of the tap. Be sure you have drilled the proper size hole for your tap. If the hole is too small, there is a risk of the tap breaking off inside the hole. If it is too large, the threads will not form properly.

2D Tapping diagram

Be sure to use adequate lubricant while tapping, whether your machine has an automatic flood coolant or manually brush the tap’s tip with oil before starting the operation. We also recommend tapping holes smaller than #6 by hand, as smaller taps break more easily. Both of these recommendations will help to avoid any unnecessary tool breakage.

When setting up your CNC program, remember to add a tapping tip depth that accounts for both the tip and initial taper of the tap, and be sure your hole is deep enough to accommodate the tap. Older CNC machines might also need a larger feed height so the spindle can reach full speed before plunging into the material.

Take the Plunge

Knowing how to efficiently plan a 2D CNC machining project starts with understanding your toolpath types. A typical CNC job will start by facing material to the highest flat surface of a part. From there, you can contour sides and start to work on additional features and fine details. Understanding the intricacies and limitations of each toolpath will give you the confidence needed to machine any part. You’ve taken a look at the fundamentals. Now practice the process!

Fusion 360 has all the CAM tools you need to easily set up your first CNC job. Try Fusion 360 for free today.

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We use Bing to deploy digital advertising on sites supported by Bing. Ads are based on both Bing data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Bing has collected from you. We use the data that we provide to Bing to better customize your digital advertising experience and present you with more relevant ads. Bing Privacy Policy
G2Crowd
We use G2Crowd to deploy digital advertising on sites supported by G2Crowd. Ads are based on both G2Crowd data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that G2Crowd has collected from you. We use the data that we provide to G2Crowd to better customize your digital advertising experience and present you with more relevant ads. G2Crowd Privacy Policy
NMPI Display
We use NMPI Display to deploy digital advertising on sites supported by NMPI Display. Ads are based on both NMPI Display data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that NMPI Display has collected from you. We use the data that we provide to NMPI Display to better customize your digital advertising experience and present you with more relevant ads. NMPI Display Privacy Policy
VK
We use VK to deploy digital advertising on sites supported by VK. Ads are based on both VK data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that VK has collected from you. We use the data that we provide to VK to better customize your digital advertising experience and present you with more relevant ads. VK Privacy Policy
Adobe Target
We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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