I've had mixed results bending EMT conduit during my initial attempts. I did succeed in getting smooth bends that were devoid of ripples, however I could never really understand how to get the measurements right. I often ended up having to make length adjustments resulting in material waste.
I did watch a couple of YouTube videos, but this one from Southwest Industrial Electric helped me understand the correct technique
To summarize the main points -
- Determine set back from your bender
- This is usually clearly marked on each bender, and can vary from 5 to 8 inches depending on the make. Each one is different.
- Point A - Establish an origin
- This is the point from where the conduit starts. This could be the junction box, another conduit coupling, or the point where the conduit exits a wall.
- Point B - Establish where you want the bend
- This is the point where the conduit will turn 90 degrees. This could be an obstruction like a wall or ceiling, or it could simply be the point where the bend would allow the conduit to meet another coupling or junction box.
- Point C
- Deduct the set back from Point B and mark on Conduit
- Position Bender in the correct orientation -
- Stub mark is on Point C
- Pedal is over Point B
- Pull towards Point B
- while applying even pressure on the pedal, until you have a 90 degree bend
Here is how I positioned mine after making the necessary marks according to my measurements
