Marking on former of conduit bender

[Amp David]

Why is there a mark stamped into the former on some conduit benders. Is it to line up the mid point of a crank set so the length of the conduit doesn't become to short when the set is pulled.

Seen a video on doing crank sets, and the guy marks 50mm from the edge of the former and make a mark which he lined up the mid point.

I'm confused

 

[Sintra]

Why is there a mark stamped into the former on some conduit benders. Is it to line up the mid point of a crank set so the length of the conduit doesn't become to short when the set is pulled.

Seen a video on doing crank sets, and the guy marks 50mm from the edge of the former and make a mark which he lined up the mid point.

I'm confused

The mark on the former is used to compensate for shrinkage when pulling a bend. The mark is always 2.5 x the diameter of the conduit.

20mm conduit = 50mm to mark.
25mm conduit = 62mm to mark.

If you need to make a bend of say 500mm from end of conduit to the back of a bend you measure the conduit and mark it at 500mm. You then align the mark on the conduit with the mark on the former and pull the bend. This should give you a length of 500mm from end of the conduit to the back of the bend.


Sent from my iPhone using Tapatalk

 

[Guest123]

The mark on the former is usually the 'back of bend' mark.

I.E if you were pulling a 90degree bend in a piece of pipe and you wanted it 1.2M from the wall to the end of the pipe, measure & mark 1.2M on the pipe, line that mark up with the mark on the former and pull the bend.


Edit, basically what he said^^^^

 

[telectrix]

i usually guess it about 3-4" over then cut to fit coz. i generally forget to allow for 1/2 the coupler