View Full Version : Broken shear
07-26-2011, 03:02 AM
I need to repair a 48 " sheet metal shear. The bar that connects the cylinders to the shear blade broke . it looks like it is cast iron / steel material. Anyone out there ever made a repair on a shear like this?
07-26-2011, 07:03 AM
No, I haven't made the repair. But I'm told that if you hit the part with a grinder and it sparks, it's steel. If not, it's cast iron.
Recently repaired my slip roll at the Santa Cruz meet with the help of blacksmith Jere Kirkpatrick of Valley Forge. He's a Henrob dealer and we used it along with cast iron rod and flux. http://saber.net/jere/
07-26-2011, 10:16 AM
the blade holder is most likely cast iron, the arm could be either cast iron or steel depending on the age, older it is more likely to be cast. Do you have pics? what brand of shear? tt;)
07-26-2011, 05:48 PM
hello mm The broken piece is cast iron . it slides in the gibs and attaches to one of the cylinders. this is a NATHIONAL shear. Picture in my album. Thanks larry
07-26-2011, 05:52 PM
http://www.metalmeet.com/forum/picture.php?pictureid=4991&albumid=383&dl=1311725683&thumb=1 (http://www.metalmeet.com/forum/album.php?albumid=383) Could not get it to copy on last post
07-26-2011, 10:49 PM
If it were mine, I would pull it apart and probably fab a new part. From the pictures it is hard to see what you would have to do to make another piece.
07-27-2011, 06:29 AM
that's a bad spot! from the pic does look like it is part that slides in the ways of the shear, ouch!
Clean, vee out the weld joint, use rod recommended by your welding supplier, take broken piece along so they can see grain of iron. If they say pre-heat or post heat do it. going to need to make temporary holder for alignment. But you already know that.....
That is the first failure of a National I've seen, pretty sure Jim had asked about the quality of National. Is this a fatigue break? or was it abused? Maybe a call to National is in order see what that part cost! Good luck! tt;);)
Looked at my Wysong made the same way, ouch!
07-27-2011, 03:53 PM
After talking to a few people thats what i,m going to do on the repair Terry . National , builds some top Quality shears and brakes . this machine was definetly abused . New replacment part is expensive ,going the repair route first .
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