Rd118a

Direct replacement for the Zund R118-A (5211733), with no modification needed. Router bit for light foam on Zund cutting systems with the RM-A QC or RM-A QC ARC router. 2-flute upcut bit with a 0.236 in (6.0 mm) cutting diameter on a 0.236 in (6.0 mm) shank.

Sold individually.

Direct OEM replacement

The Rd118a replaces the Zund R118-A (5211733). It has a 0.236 in (6.0 mm) shank, 0.236 in (6.0 mm) cutting diameter, 1.063 in (27.0 mm) cutting length, and 2.953 in (75.0 mm) overall length, with the stop ring the ARC bit changer needs to set depth. If your router runs the R118-A now, the Rd118a drops straight in. Not sure? Contact us before you order.

What this bit is built for

Zund lists the R118-A for light foam, under 3.2 lb/ft³ (52 kg/m³). The long 1.063 in (27.0 mm) cutting length reaches through thick foam sheet in one pass, and two flutes leave a smoother edge in soft foam than a single flute.

Built for the ARC bit changer

This is the A-version. The stop ring sets the bit's depth in the collet, so the RM-A QC ARC automatic bit changer loads it at the same height every time. For routers without ARC, the standard Rd118 replaces the Zund R118.

Common questions

How do I know this fits my machine?

The Rd118a fits Zund RM-A QC and RM-A QC ARC routers that take the Zund R118-A. It has a 0.236 in (6.0 mm) shank. If your router does not use the stop ring, order the Rd118 instead. Not sure? Send us your machine model and we will confirm before you order.

What materials does it cut?

Light foam under 3.2 lb/ft³ (52 kg/m³). For denser foam, wood, or plastics, a different bit geometry is the better call. Reach out and we will help you pick the right one.

What speeds and feeds should I run?

Maximum spindle speed is 48,000 RPM. The right feed rate depends on the foam, its thickness, and your machine. If you need help dialing in settings, contact us. We run these machines every day.

How do I know when to replace it?

Watch the edge finish. Torn or fuzzy foam edges, melting, or the bit dragging material instead of cutting it cleanly all mean it is time for a fresh bit.

Getting the most from your cutting table

A fresh bit is a good start. But if you are going through bits faster than expected, or edge quality has become inconsistent, the bit is rarely the whole story. Spindle speed, feed rate, depth per pass, material hold-down, and machine condition all affect how long a bit lasts and how clean it cuts.

It is worth asking: When was your machine last serviced? Are your parameters dialed in for this material? Is this the right bit for what you are cutting? Could your operators use time with someone who runs these machines every day?

Flatbed Tools offers machine service, preventive maintenance, operator training, and workflow consulting. If something is not cutting right, reach out. We have probably seen it before.