Current Tools 750 / 751 (Chicago bender, rigid and IMC): radius, deduct and gain
The Current Tools 750 / 751 (Chicago bender, rigid and IMC) is a mechanical bender for rigid (RMC) and IMC, 1/2" to 1-1/2". These are the numbers BendMate uses for each of its shoes.
Part numbers: 750 (1/2 to 1), 751 (1-1/4 and 1-1/2)
Specs by shoe
| Size | Centerline radius | Deduct | Gain | Notes |
|---|---|---|---|---|
| 1/2" RMC | 2 5/8" | 5 1/2" | 1 15/16" | Gain worked out from the radius. 750. This radius is below the NEC 4 in minimum; Current Tools says to bend 1/2 in the 3/4 groove to meet code, but prints no deduct for that. |
| 3/4" RMC | 4 5/8" | 8 1/2" | 3 1/16" | Gain worked out from the radius. 750. |
| 1" RMC | 5 7/8" | 11" | 3 13/16" | Gain worked out from the radius. 750. |
| 1-1/4" RMC | 8" | 13 5/8" | 5 1/16" | Gain worked out from the radius. 751. |
| 1-1/2" RMC | 9 5/8" | 15 5/8" | 6" | Gain worked out from the radius. 751. |
| 1/2" IMC | 2 5/8" | 5 1/2" | 1 15/16" | Gain worked out from the radius. 750. This radius is below the NEC 4 in minimum; Current Tools says to bend 1/2 in the 3/4 groove to meet code, but prints no deduct for that. |
| 3/4" IMC | 4 5/8" | 8 1/2" | 3" | Gain worked out from the radius. 750. |
| 1" IMC | 5 7/8" | 11" | 3 13/16" | Gain worked out from the radius. 750. |
| 1-1/4" IMC | 8" | 13 5/8" | 5 1/16" | Gain worked out from the radius. 751. |
| 1-1/2" IMC | 9 5/8" | 15 5/8" | 6" | Gain worked out from the radius. 751. |
Marks on the shoe
- 1Front edge of the hookLine your marks up here. This is the arrow the app’s marks are for.
The angle is read with the pointer on the degree scale.
Where the numbers come from
Bend with the Current Tools 750 / 751 (Chicago bender, rigid and IMC) in BendMate
Choose it in the app and every mark comes from these numbers. Edit any of them to match your own bender.
Common questions
What is the deduct for 1/2" RMC on the Current Tools 750 / 751 (Chicago bender, rigid and IMC)?
5 1/2". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 2 5/8" and its back-of-90 gain is 1 15/16".
What is the deduct for 3/4" RMC on the Current Tools 750 / 751 (Chicago bender, rigid and IMC)?
8 1/2". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 4 5/8" and its back-of-90 gain is 3 1/16".
What is the deduct for 1" RMC on the Current Tools 750 / 751 (Chicago bender, rigid and IMC)?
11". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 5 7/8" and its back-of-90 gain is 3 13/16".
What is the deduct for 1-1/4" RMC on the Current Tools 750 / 751 (Chicago bender, rigid and IMC)?
13 5/8". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 8" and its back-of-90 gain is 5 1/16".
Brand and model names only identify the bender. BendMate isn’t affiliated with or endorsed by Current Tools. Check the numbers against the markings on your own bender.