Mitre Gauge Slot Size
If you're planning on making a sliding jig or fixture for your woodworking shop, the INCRA Miter Slider is exactly what you need. These inexpensive aluminum runners adjust for PERFECT sliding action in any standard (or near standard) 3/4' by 3/8' miter gauge slot with just a twist of the wrist. They lock firmly in place with another twist of the wrist. Won't warp, shrink or swell like wooden runners. Includes plans for a wide variety of shop-made jigs and fixtures. Anodized aluminum for durability and beauty. Available in 18' and 24' lengths.
- Adjusts for perfect sliding action in any standard miter gauge slot with just a twist of the wrist
- Locks securely in any standard miter gauge slot with another twist of the wrist
- Includes threaded mounting holes and hardware for easy attachment to any application
- Includes plans for a wide variety of shop-made jigs and fixtures
- All mounting hardware included
So, here is something I learned today. There is a woodworking show in town this weekend at the expo center - you know, the kind of show with booths from all the tool and accessory manufacturers. I picked up a couple of 'universal' miter bars that I hoped to use on a crosscut sled that I plan to build, along with a Fulton thin-rip tablesaw jig, also designed to fit a standard 3/4' slot. None of it fits. I honestly thought the Shopsmith had standard sized miter gauge slots, but apparently they are about 1/16' narrower. Why would Shopsmith do that to us? Wouldn't it be just as easy to make it a standard size? Frustrating. 
Mitre Gauge Slot Sizes
Having cut the slot, a standard 3/4' miter gauge fit, but very tight. I needed to widen it by a fraction of a millimeter. I put some pieces of tape on my spacer and made another cut. So I added more tape and cut again, then more tape, and more tape. Re: mitre gauge slot size Hi Roy thanks for your input. My old Craftsman TS is 3/4 by 3/8 standard slot. There are some I know of that have the T groove but it is still 3/4 inch. I picked up a couple of 'universal' miter bars that I hoped to use on a crosscut sled that I plan to build, along with a Fulton thin-rip tablesaw jig, also designed to fit a standard 3/4' slot. None of it fits. I honestly thought the Shopsmith had standard sized miter gauge slots, but apparently they are about 1/16' narrower.