Tube Bending Rules to Know
Distance of Bend from Coped End
The distance from the deepest part of the cope or notch should be no less than 3 inches to the start of the bend. This goes for both ends of the tube. Anything less risks deformation or cracking before the bend is finished being formed.
No Features in a Bend
There can be zero features or markings in the bend of the tube. This includes holes, keys, markings, and other features. These can cause the tube to deform or crack during bending. A good rule of thumb is to leave at least 0.75 inches from the feature to the edge of the bend.
Design with the Correct CLRTube Radius Chart
It is critical that you design your parts in CAD to match the correct CLR (Center Line Radius) of the bend. If you do not, the part will not fit correctly and may not be able to be bent at all. We can fix them somewhat, but it's best to send files that match real-life outcomes.
Distance Between Bends
Leave at least 4 inches of space between bends or rolls. If bends are too close, the clamp die could burr the edge of the tube or affect the previous bend. Check with us if closer spacing is needed.
Common questions
How close can a bend be to a coped end?
Leave at least 3 inches from the deepest part of a cope or notch to the start of the bend, at both ends of the tube. Less risks deformation or cracking before the bend is finished.
Can I put holes or features in a tube bend?
No. Keep holes, keys, markings and other features out of the bend. A good rule of thumb is at least 0.75 inches from the feature to the edge of the bend.
Why does the CLR in my CAD file matter?
Design the part in CAD with the correct center line radius (CLR) of the bend. If the CLR does not match, the part will not fit correctly and may not be able to be bent at all.
How much space do I need between tube bends?
Leave at least 4 inches between bends or rolls. Closer bends risk the clamp die burring the tube edge or affecting the previous bend. Check with CalWest if closer spacing is needed.