Joinery · 8 min read
Dovetail jig setup: template alignment and test-cut fitting
Most dovetail jig frustration comes from template alignment, not the router. Here is how to dial in the fit before cutting good stock.
By SQUAREFORGE Shop Desk · Updated
Key takeaways
- Always cut a test joint in scrap the same thickness as your project stock.
- Fine-tune fit with the jig's finger adjustment, not by forcing the joint together.
- Mark board pairs so tails and pins from the same setup stay matched.
Aligning the template
- Set stock thickness on the jigMatch the jig's finger spacing guide to your actual board thickness.
- Clamp square to the jig bodyUse the jig's built-in stops so both the tail and pin boards sit at the same reference edge.
- Rout the test piece firstAlways run a joint on scrap the same thickness and species before cutting show stock.
Reading the test fit
| Test result | Adjustment |
|---|---|
| Too tight, needs force | Move the template guide out fractionally |
| Too loose, gaps visible | Move the template guide in fractionally |
| Fits but not flush | Check depth of cut, not just width |
Keeping boards matched
- Number each pair of tail and pin boards as you cut them.
- Keep the same bit and template setting for an entire drawer set.
- Store test cuts as a reference if you'll return to the same setup later.
Joinery setup checklist
| Stage | Tasks |
|---|---|
| Before cutting | Confirm stock thickness, test-fit on scrap, check bit or cutter sharpness |
| During assembly | Dry-fit every joint, check squareness, have clamps and glue ready before mixing |
| After glue-up | Recheck diagonals, clean squeeze-out before it skins over |
/ Frequently asked
Why do my dovetails come out too loose?+
Loose joints usually mean the template guide is set too far out, or the bit depth is slightly shallow. Test on scrap and adjust in small steps.
Can one jig cut both through and half-blind dovetails?+
Some combination jigs handle both with different templates or fingers; check your jig's manual for the specific template needed.