Cnc Wood Router 1325 with Rotary: Setup, Rotary Axis Use and Tips (2026)

By Claire Whitaker

Updated November 2026

A cnc wood router 1325 with rotary is a 1300 mm by 2500 mm (roughly 4 by 8 foot class) bed machine paired with a fourth-axis attachment that lets the router cut around cylinders such as table legs, bowls, bottle-shaped turnings and round signs. This guide walks through what the rotary axis does, how to wire and home the machine, how to set up a rotary job in CAM software, and the mistakes that most often ruin parts. By the end, you should be able to mount a workpiece, configure the rotary axis and run a first test cut with confidence.

What the Rotary Axis Does on a 1325 Router

The rotary attachment adds a fourth axis, usually called A, which spins the workpiece about the X axis (in most setups, the long axis of the machine). Instead of cutting flat on a sheet, the spindle travels across a part that is turning under it. Software converts your 3D model into coordinated moves so the cutter follows a path around the circumference of the stock.

Shopping for one? See our guide: 5 Best Hobby CNC Wood Routers of 2026: Buyer's Guide.

Most rotary attachments on machines in this size class are either a simple indexing head or a true continuous rotary driven by a stepper or servo. Continuous rotary is needed for carving and engraving around a cylinder. An indexing head is fine for cutting flutes or a set number of facets. Check which type came with your machine before you plan a project, because the CAM settings differ.

Before You Power On: Checklist

Gather these items before the first run:

• Rotary attachment, tailstock or chuck, and the correct mounting hardware for your bed
• Collet set matching your router bits (commonly 1/4 inch and 1/8 inch)
• Dust collection hose and a shop vacuum rated for fine wood dust
• Sacrificial spoilboard, usually MDF or plywood, screwed or vacuum-held to the bed
• Calipers, a dial indicator or a digital height gauge for checking runout and Z zero
• Your controller software and a post-processor that matches your controller (Mach3, Mach4, GRBL variants or a vendor-specific control)
• Hearing and eye protection, and a dust mask rated for wood particulates

Step 1: Mount the Rotary Attachment Correctly

Bolt the headstock to the bed so the centerline of the rotary spindle is parallel to the X axis. Misalignment here shows up as tapered or banana-shaped parts. Use a dial indicator on a straight bar or a precision square to check parallelism, and aim for alignment within a few thousandths of an inch over the length of the part.

Next, set the tailstock so it supports the far end of the workpiece without binding. For long, slender parts, a live center reduces friction and heat. For short blocks, a chuck or a glued-up end block with a centered pin is usually enough. Tighten all clamps, then manually rotate the axis by hand to confirm there is no grinding or binding before you apply power.

Mounting the Blank

1. Mark the centerline on both ends of the blank with a pencil and an X at the center point.
2. Drill or punch a shallow center mark at each end so the chuck or tailstock seats cleanly.
3. Clamp the blank between headstock and tailstock with light, even pressure. Overtightening can split end grain.
4. Spin the blank by hand and check for wobble. A slight wobble is acceptable only if your toolpath accounts for it.

Step 2: Wire, Home and Calibrate the Axes

Connect the rotary stepper or servo to the fourth-axis driver port on your controller, following the wiring diagram supplied by your machine maker. Mismatched phase wires cause the axis to stall or vibrate, so double-check the colors before powering up. Keep the high-voltage motor cables separated from signal cables to avoid noise.

Home the X, Y and Z axes first. Then set up the A axis in your controller’s settings. The most important values are steps per degree, maximum velocity and acceleration. Calculate steps per degree from your motor step count, microstepping setting and any pulley or gearbox ratio. For example, a 200-step motor at 8x microstepping with a 1:1 drive produces 1600 steps per revolution, or about 4.44 steps per degree. Verify the value by commanding a 360 degree move and measuring the actual rotation with a protractor or marked disc.

Setting Your Z Zero and Tool Length

Touch the tip of a fixed-length bit to a known reference, such as a zeroing plate, and set Z zero at the top of the workpiece. For a cylinder, set Z zero at the highest point of the stock surface when the part is at rotation angle zero. Re-check after any change to the tailstock or chuck position, because this can shift the effective height of the stock.

Step 3: Prepare the Model and Toolpath

Rotary jobs usually start in a 3D or CAM package. Set the stock as a cylinder or a rectangle with rotary wrap enabled, using the actual diameter and length of your blank. Enter the diameter carefully, because the surface speed at the cutter depends on it. Feeds calculated for a 1 inch diameter blank will be too fast or too slow for a 3 inch one.

Choose the toolpath strategy that matches your goal. Rough the bulk material with a larger bit in multiple depth passes, then finish with a smaller ball-nose or tapered bit at a finer stepover. Keep the stepover small enough that the scallops between passes are invisible after sanding.

Treat these numbers as starting points. Hardwoods like maple need slower feeds than pine, and resin-rich softwoods can gum up bits, so check the bit manufacturer’s recommendations and adjust from your first test.

Feeds, Speeds and Safe Starting Values

• Spindle speed: start in the middle of your router’s range and adjust based on sound and chip quality.
• Feed rate: begin conservatively and increase in 10 percent steps while watching for chatter or burning.
• Rotary speed: keep the surface speed at the cutter in a reasonable range. A large-diameter part spinning fast can outrun the cutter’s ability to clear chips.

Step 4: Run a Test Cut

Never start with your final part. Cut a test blank of the same species and diameter first, using a shallow depth of cut. Watch the first few passes closely. Listen for a steady cutting sound. Stop immediately if you hear a squeal, a knock or a sudden change in pitch. Check that the rotary axis moves smoothly and that the cut stays centered on the blank.

After the test, measure the diameter at several points along the length and compare it to your model. Small discrepancies usually come from steps-per-degree errors, mounting runout or a Z zero that drifted during setup. Correct the value, run the test again, and only then move to the final part.

Common Mistakes

• Skipping the parallelism check, which produces tapered parts.
• Entering the wrong blank diameter in CAM, which throws off feeds and depth.
• Overtightening the chuck or tailstock, which can crack end grain.
• Forgetting to re-zero Z after moving the tailstock or swapping the chuck.
• Running at full feed on the first test instead of testing at a conservative rate.
• Ignoring dust. Fine dust can clog the rotary bearings and cause heat buildup, so clean and inspect the attachment regularly.
• Leaving the spoilboard unflattened, which makes Z zero unreliable.

Tips for Better Rotary Results

• Use a live center for long parts to keep them from deflecting under cutting pressure.
• Glue waste blocks to the ends of square stock to create a more stable mounting surface.
• Mark a reference line along the blank so you can check rotational alignment after each pass.
• Keep a log of steps-per-degree values, feed rates and bit types for each species you cut. This saves time on repeat jobs.
• When carving detail, reduce feed rate on curved sections where the effective chip load changes.

Recommended gear

A few supplies make rotary work noticeably easier. Choose items that match your router’s collet and bed size.

• Solid carbide ball-nose bits in 1/4 inch shank are useful for finishing curved surfaces smoothly. View on Amazon
• A dial indicator with a magnetic base helps check runout and headstock alignment during setup. View on Amazon
• A dust extractor rated for wood dust keeps fine particles off the rotary bearings and improves visibility during the cut. View on Amazon

Related Reading

If you are still getting comfortable with the controller, the step-by-step guide in Wood Router Computer Controlled: How to Set Up and Run a CNC Router (2026) covers homing, zeroing and file handling in more detail. For tooling choices across different cut types, Top 7 Best CNC Router Bits for Wood Compared for Every Project is a useful comparison. Builders interested in carving decorative pieces may also find Wood Carving with Router: 5 Best CNC Machines and Bits Compared helpful.

FAQ

Is a rotary attachment necessary for a 1325 router?

No. The machine cuts flat sheet goods without it. A rotary attachment is only needed when you want to cut cylindrical or round workpieces, such as legs, bowls or turned-style shapes.

How do I know my steps-per-degree value is correct?

Command a full 360 degree rotation and measure the actual movement with a marked disc or protractor. If the result is off, adjust the steps-per-degree value in your controller and repeat the test until the error is negligible.

What is the best wood species to start with on a rotary?

Start with a soft, stable hardwood or a clear softwood such as pine. These cut predictably and show errors clearly, which makes them good for learning your settings.

Why does my rotary part come out tapered?

The most common cause is a headstock that is not parallel to the X axis. Recheck alignment with a dial indicator. Uneven clamping pressure or a worn tailstock center can also contribute.

Should I use a live center or a fixed center?

A live center is better for long parts because it reduces friction and heat. A fixed center is fine for short blocks, but check it regularly for wear and lubrication.

How often should I clean the rotary attachment?

Clean it after every session where you produced significant dust. Check bearings and moving parts periodically, and follow the maintenance schedule in your machine’s manual.

Do I need special software for rotary cutting?

You need CAM software that supports a fourth axis or rotary wrap, and a post-processor that outputs code your controller understands. Confirm both before buying or starting a project.

Conclusion

A cnc wood router 1325 with rotary opens up cylindrical and round projects that flat-bed work cannot touch. Careful mounting, accurate steps-per-degree calibration and a conservative test cut will prevent most of the problems beginners encounter. Once your settings are dialed in for a species and diameter, record them so each new project starts from a reliable baseline. For specific fine-detail or large-scale work, consult your machine manufacturer’s documentation and, where safety or electrical questions arise, a qualified technician.

About Claire Whitaker

Claire Whitaker is part of our editorial team and reviews and edits our woodworking guides, checking product details against manufacturer specifications and owner feedback.