dumbest noobie bender question ever.

[jekbrown]

good grief. I figured I better go ahead and ask before I waste any more tube. I have a 105HD manual bender and am trying to do some calibration bends for Bend Tech EZ3d. You need to do a 180 and a 90 and take some measurements. The problem is, all the directions say "bend until the degree ring says 90/180". Great ****ing plan...to bad spring back or some other force of nature is making it impossible for me to get accurate bends. they all end up less than I want after I remove the tube from the bender.

Can anyone give me step by step instructions on how to set the degree indicator ring thingy to accurately compensate for the spring back? I think I've got this thing figured out, I just need to be able to account for the SB and all will be good. I hope....

 

[chopped&bobbed77burb]

try this forum http://www.offroadfabnet.com/index.php . I can always come up and give ya a hand if needed

 

[ktmoutfront]

every tubing size (dia. and wall thickness) has different spring back at different bend degrees. I use an angle finder I bought from Trick Tools to check angles before removing the tubing. If you are just trying to get the 90 and the 180 to set up bend tech, use a framing square for the 90 and leave enough length on both legs to measure parallel on the 180.

 

[AZ79K5Project]

As stated above - you should be able to keep checking it with the square before completely removing the tube.

 

[mofugly13]

I have never bent tube for roll cages, but I have bent loads upon loads of electrical conduit from 1/2" EMT to 5" Rigid Steel Pipe. Our bending machines have the same issues, we bend to 90* on the degree indicator, and springback opens the bend up. So, what I do is bend 1* past 90*,then unload the bender just until the pipe stops springing back, then measure for 90*. Always mark the pipe where it contacts the front of the bending shoe, so that if you need to put more in, the pipe will seat into the shoe right where it was the first time. Then bend in one more degree. I have found springback on 90* bends to be roughly 2-3%, regadless of the pipe size or type. So on a 90* bend, bending to 92-92.5* on the dial puts it right on after springback.

 

[Captainfab]

The amount of springback will depend on the size of the tube, the wall thickness, the type of tube (HREW or DOM) and the degree of the bend. Oh and one other thing that is a small factor is the temperature of the tube. Since you are going to be bending tube, you will need to determine the average amount of springback for each size and type of tube you will be bending. On the degree ring for the PT105 there are 5 degree marks to the negative side of 0 that can be used to compensate for the springback if desired. Or just simply bend past your desired degree of bend by the amount of springback. I have found that 5* is a good place to start when figuring springback. Of course your results may vary.

To answer your question on calibrating for BT, you will need to bend a true 90* bend and a true 180* bend to do the calibration. Then just follow the instructions and you should get your CCLR and CLR. Also don't forget to calculate your Bend Location Offset. If you need any help feel free to contact me or check out these websites.

http://www.offroadfabnet.com

http://www.2020softwaresolutions.com/cmps_index.php

Or you can also call Cris at bend tech directly @ 651-257-8715 He is always more that happy to help his customers.