IGM FD3080 is the optional steel template for making 8 mm box joints on IGM FD300 and FD600 jigs. It mounts onto the existing jig structure without modifications. It includes an 11.1 mm guide bushing and blue positioning stops. For use, the IGM M100-08081 HW downcut D8 x 25 mm router bit with 8 mm shank is required, not included. Distributed in Italy by Krollit, official IGM distributor since 2007.
- Joint type: 8 mm box joint
- Compatible with: IGM FD300 and FD600 jig
- Template material: steel
- Included guide bushing: 11.1 mm
- Positioning stops: included, blue
- Required router bit, not included: IGM M100-08081 HW downcut D8 x 25 mm, 8 mm shank
Who the FD3080 is suitable for
| Profile |
Compatibility |
Reason |
| Owner of an IGM FD300 or FD600 jig |
Suitable |
Extends the existing jig with 8 mm box joint capability without purchasing new equipment |
| Woodworker producing solid wood drawers and containers |
Suitable |
The box joint is a standard joint for drawers, boxes and containers made of solid wood and plywood |
| User who does not own an FD300 or FD600 jig |
Not suitable |
The FD3080 is an optional template — it requires the FD300 or FD600 jig as a base |
Not suitable for: use without the correct downcut router bit — the 8 mm box joint requires the IGM M100-08081 HW D8 x 25 mm router bit with 8 mm shank; using bits with a different geometry compromises the quality of the joint.
Standard equipment
- Steel template for 8 mm box joint
- 11.1 mm guide bushing
- Blue positioning stops
Technical specifications
| Joint type |
8 mm box joint |
| Compatibility |
IGM FD300 and FD600 jig |
| Template material |
Steel |
| Included bushing |
11.1 mm |
| Included stops |
Yes, blue |
| Required router bit |
IGM M100-08081 HW downcut D8 x 25 mm, 8 mm shank, not included |
Frequently Asked Questions
Does the FD3080 work with both the FD300 and FD600?
Yes, the FD3080 template is compatible with both IGM FD300 (305 mm) and FD600 jigs. It mounts onto the existing jig structure without modifications or additional tools.
What is the difference between a box joint and a dovetail joint?
A box joint has rectangular fingers of uniform width — 8 mm in this case — that interlock alternately between the two pieces. A dovetail joint has a trapezoidal profile that resists pulling forces. The box joint is easier to make with a straight router bit and creates a joint with a large gluing surface, widely used for drawers and containers.
Which router bit is required to use the FD3080?
For the 8 mm box joint with the FD3080 template, the IGM M100-08081 HW downcut D8 x 25 mm router bit with 8 mm shank is required. The downcut geometry is necessary to obtain a clean top edge on the workpiece during routing. Using different bits does not guarantee joint precision. Contact Krollit at +39 0825-1494022 to check availability of the router bit.
Can I buy multiple optional templates for the same FD300 jig?
Yes. The IGM FD300 jig accepts several interchangeable optional templates: box joints in different sizes, small lapped dovetail and through dovetail. Each template requires its own bushing and the specific router bit indicated by the manufacturer. Contact Krollit for the complete catalogue of templates compatible with FD300 and FD600.
Does the included 11.1 mm bushing replace the FD300 jig bushing?
Yes. The 11.1 mm bushing included with the FD3080 replaces the 15.8 mm bushing supplied with the FD300 jig for making half-blind dovetails. Each optional template has its own dedicated bushing calibrated for the corresponding router bit — it is important to always use the bushing matched to the mounted template.
