Jump to content


Photo

Bandsaw Blade Snapped


  • Please log in to reply
5 replies to this topic

#1 Harrison541

Harrison541

    A bowl of prawns, avocado and cress?

  • Members
  • PipPipPipPipPip
  • 498 posts
  • Location: Merseyside

Posted 02 January 2017 - 02:55 PM

What would cause it to snap like this?

 

IMG_20170102_143938977.jpg

 

600392e8-fe88-4c26-a47e-2cb14be4280a.jpg

 

 

I've been cutting steel box section with it, the snap isnt straight so it doesnt look like the weld has gone. Also I've found 2 other cracks starting from the top of the blade like the one shown in the second photo.

Can anyone tell me what I'm doing wrong? I've only used that blade for about 10-15 cuts and the teeth are still really sharp.


Edited by Harrison541, 02 January 2017 - 02:57 PM.


#2 mini13

mini13

    Up Into Fourth

  • Members
  • PipPipPipPipPipPipPipPipPip
  • 3,794 posts

Posted 02 January 2017 - 02:58 PM

could just be a cheap blade, or it could be heat. it ist a hor saw? can you get some lube on it



#3 sledgehammer

sledgehammer

    Up Into Fourth

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPip
  • 3,059 posts
  • Location: I'm sittin here besides my self

Posted 02 January 2017 - 03:35 PM

I use the large band saws at work , for box section , with soluble oil

 

over a period of time , where they bend / flex around the wheels , they seem to harden & start cracking

 

happens to the best of them (or maybe my company just buys cheap - Thames valley saw services) some last longer than others

 

you could try less tension on them - but they go out of true & blade slips

 

they can be welded back together , which we do if it's a new blade , the weld usually lasts till it cracks somewhere else

 

have had ones that have lasted ages & go blunt , when you take them off you can easily snap them by hand into little bits

 

edit - with only 10 - 15 cuts , I would weld it back up & complain to supplier , as I would expect 1000's of cuts

 

looks like it could be an over hardened blade , to crack so soon - normally the blade edge is blue where only that bit is hardened (just a guess)


Edited by sledgehammer, 02 January 2017 - 03:46 PM.


#4 stoneface

stoneface

    Speeding Along Now

  • TMF+ Member
  • PipPipPipPipPip
  • 312 posts
  • Location: Surrey

Posted 02 January 2017 - 04:41 PM

The quality of blades do vary and can snap very quickly if they are tensioned too tightly, wrong number of teeth for the section being cut, lack of lubrication or cooling, or just poor quality blade.

 

The cheaper blades which are all carbon steel don't last as long as the bi-metal blades with HSS teeth welded to a flexible back.

 

I always use bi-metal blades now after problems with carbon steel.

 

Also, the correct number of teeth per inch makes a big difference with blade life and blades snagging and breaking.



#5 Steve220

Steve220

    Up Into Fourth

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPip
  • 4,877 posts
  • Location: Shropshire
  • Local Club: RAF Mini Club

Posted 04 January 2017 - 01:24 PM

They will eventually crack and snap. It's extremely common. When you've got an 8ft bandsaw used for wood and one lets go, scares you *******!



#6 Spider

Spider

    Moved Into The Garage

  • Admin
  • PipPipPipPipPipPipPipPipPipPipPip
  • 13,845 posts
  • Location: NSW
  • Local Club: South Australian Moke Club

Posted 04 January 2017 - 09:56 PM

If the blade isn't tight enough, it'll try and flex. They are a tensile steel and don't like trying to flex that way!

 

I tighten mine up pretty tight!

 

Also, don't set the guides too close to the job.






1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users