Kreg KMS7102 Precision Miter Gauge System Review

The miter gauge supplied with a table saw is almost always the cheapest part of the machine. It has a stamped scale, a thin pointer, a short fence or no fence at all, and a bar that rattles in the slot. Every one of those contributes to a crosscut that is not quite square.

The KMS7102 replaces the whole assembly. The system includes the gauge head, the fence and the bar — which matters more than it sounds, because competing gauges frequently sell the fence separately and the real price is not the one on the listing.

Slot slop is the hidden problem

If the bar can rock in the mitre slot, the gauge can rotate as the work is pushed, and the cut drifts. Most people blame the angle setting for a cut that is out; the cause is usually the bar.

The Kreg bar has adjustable inserts that expand to fill a slot that is oversized, worn, or simply a bit different from nominal. Set it so the gauge slides without drag and with no side play, and you have removed the biggest source of error before touching the angle scale.

Stops, and where Incra is better

The KMS7102 is factory calibrated and has adjustable stops at the common angles, with a vernier scale for everything between. That is good and it is repeatable.

Incra’s AngleLOCK system uses machined V-grooves — physical detents the gauge drops into. It is a step more positive: you feel the gauge seat at 45 rather than aligning it to 45. If you cut a lot of angled work, that difference is what the extra money buys. If most of your cutting is square with occasional mitres, the Kreg is plenty.

Practical notes

Add a sacrificial auxiliary fence. Screwing a straight piece of hardwood to the fence gives you zero clearance at the blade, which kills tear-out, and it can be crosscut into for stop blocks.

Do not lean on the fence. This is an aluminium extrusion — it is straight and it is not a bench. Support long boards with a stand rather than against the gauge.