Bits / Workshop reference
Roundover & edge-profile bits
Understand profile radius, bearing contact and height before shaping a finished edge.
In everyday language
Turn a sharp edge into a gentle curve
A roundover bit makes a curved edge. Its radius describes the curve size.
Sketch a small rounded edge on a shelf. Compare the curve with the actual board thickness and the adjoining faces.
What to notice: A setup sample shows whether the curve blends into the faces or leaves an unwanted step.
Does a larger curve always suit a thin board?
No. Check the tool shape against the material thickness and intended appearance before choosing the profile.
No need to know the vocabulary first
A few words, explained
- Collet
- The gripping sleeve that holds the shank of a cutting bit.
How it works
The tool's shaped edge removes a matching profile. Height and lateral position determine whether the transition is flush or leaves an intentional shoulder.
When to consider it
Use a matching radius or profile to ease an exposed edge with an approved router and adequate support.
Where it does not apply
Radius and overall cutting diameter are different dimensions. A profile bit's maximum speed may be lower than a small straight bit's.
Before the first cut
- Confirm the exact cutter radius, cutting diameter, bearing and machine compatibility.
- Set depth with the machine isolated and use matching scrap to check both ends of the profile.
- Use the manual's guards, guiding method and feed direction; keep small parts in an appropriate fixture.
Review collet engagement & stickout · Review material setup & zero
If the result looks wrong
Stop the machine and make it safe to inspect before checking the tool or workpiece.
Unwanted ledge
Check bit height, bearing size and contact, then retest on scrap.
Burned profile
Check edge condition, support and the documented operating range; do not diagnose from color alone.
Use the matching calculator
Calculator outputs describe geometry, time or cost—not permission to operate at those values.
Make the setup repeatable
In Machine & Bit Settings, keep these details in the standard fields, additional fields and setup notes. Record a test date only after testing that exact setup.
- Profile and radius
- Bearing or fence reference
- Final height setting and sample
No cutting settings are automatically supplied or saved by this guide.
References & exact specifications
These public references explain the tool families or software features. Locate your exact part number and machine manual before setup; product families are not interchangeable.
Guidance reviewed September 2026. Diagrams are original simplified explanations, not manufacturer drawings.