1-1/2" EMT bender deduct by bender

What bends 1-1/2" EMT

Hand benders stop at 1-1/4" EMT, so every row in the table above belongs to a machine. The deduct is the distance from the machine’s benchmark, usually the front edge of the hook or a saddle, to the back of the finished 90, and each shoe has its own.

• Mechanical: the Greenlee 1818 deducts 12 15/16" and the Gardner Bender Sidewinder 15 3/4".
• Electric: the Greenlee 855GX deducts 15 3/8", the iToolco B2 14" and the Gardner Bender B2000 13 1/2". The Greenlee 555 depends on which shoe group is fitted (below).
• Hydraulic: the Greenlee 882 deducts 13" on an 8 1/16" radius.

Why the deducts spread over 2 13/16"

Here the radius and the straight both move. The radii run from 8 1/16" to 11 3/8", the largest on the Gardner Bender Sidewinder, whose 1-1/2" shoe has a bigger radius than its 2" shoe (9 7/16") because they are different designs. And each machine puts its benchmark a different distance ahead of the arc. The deducts end up 2 13/16" apart.

That is why a deduct cannot be carried from one machine to another. Mark a 30" stub with 12 15/16" on a shoe that really takes 15 3/4" and the stub comes out 2 13/16" long.

Same machine, different shoe group

The table lists shoe groups, not just machines. A Greenlee 555 deducts 13 7/8" for 1-1/2" EMT with the multi-shoe group and 14 7/8" with the single-shoe group, 1" apart on the same motor. The Current Tools 77 does the same: 13 7/8" multi-shoe, 14 7/8" single-shoe.

Marks for common 1-1/2" EMT stubs

A mark very close to the end leaves the hook nothing to hold. Each manual gives a minimum distance from the end of the conduit, so the shortest stub a machine can make is its deduct plus that distance.

Confirm it on your machine

1. Find the deduct for your shoe group in the manual or on the chart fixed to the machine.
2. Bend a test 90 in a scrap of 1-1/2" EMT, marked at 15 1/8" for a 30" stub.
3. Measure from the end to the back of the bend. Any difference from 30" is the correction to your deduct.