Thread: Need ID of Mitre for table saw

It looks like a fairly standard mitre gauge from a table saw, band saw or disc sander. The bar may fit a 'standard' track, depending on the brand. On that photo, the pointer isn't straight. It needs to be set up correctly at 90° and the screw tightened. It should then be correct for other angles. However, they aren't terribly precise, so if you're using it for mitres on fine work you should do test cuts first.

Fairly standard generic unit, industry standard for bars for America has been 3/4"x 3/8" for some time, though a few manufacturers came up with there own 'standards' including inverted T slot to trap the bar in the table during the cut, or other dimensions more suited to their variety of table top. The unit pictured has a very short bar in comparison to that normally found on accurate table saws suggesting an very cheap table saw (Aldi/Ozito level) a fairly cheap bandsaw or a sander.

Though not commonly supplied as the stock mitre guide with precision table saws, the more accurate after market ones these days have bar width adjustable with screws from the top so that the user can fine tune the fit in the slot to maximise repeatable accuracy. Typical examples in that range would be Kreg and Incra, though I'm sure to have omitted some other brands as well.

If you could set the bar and fence on the example shown to be exactly 90 degrees apart, then permanently lock that angle, and use it on a table saw with nominally similar slot dimensions, I would expect a range of cut angle of 90+/- 2 or 3 degrees due to bar dimension tolerance, slot dimension tolerance and short bar all randomly stacking up to reduce accuracy.