ADVICE: Bandsaw Blade Twist

ADVICE: Bandsaw Blade Twist

Post by RonB » Wed, 27 Oct 2004 06:23:23



A few days ago I managed to get a 3/8" bandsaw blade crossed up as I was
finishing with a thick piece of hardwood.  Short story shorter, I ended up
with a twist that is set into about 3" to 4" of its length.  I am guessing
at it's worst its about a 10 to 20 degree twist.  I didn't realize until
today that the "rattle" effect was too severe to leave it on the machine and
swapped it out.

Is there any Practical way to straighten one of these?  It is a fairly new
and sharp blade.  Obviously sharper that the user.

Thank you in advance for any advice.
RonB

 
 
 

ADVICE: Bandsaw Blade Twist

Post by Georg » Wed, 27 Oct 2004 07:17:34


You can twist it back and tap it relatively straight - making sure to stay
away from the teeth, of course.  This is a gentle hammering, not a
blacksmith-type.  it will harden the blade a bit, even when conducted on a
wooden anvil.

Move your guides out to keep it from binding, and use it for rough work
until it goes.


Quote:
> A few days ago I managed to get a 3/8" bandsaw blade crossed up as I was
> finishing with a thick piece of hardwood.  Short story shorter, I ended up
> with a twist that is set into about 3" to 4" of its length.  I am guessing
> at it's worst its about a 10 to 20 degree twist.  I didn't realize until
> today that the "rattle" effect was too severe to leave it on the machine
and
> swapped it out.

> Is there any Practical way to straighten one of these?  It is a fairly new
> and sharp blade.  Obviously sharper that the user.

> Thank you in advance for any advice.
> RonB


 
 
 

ADVICE: Bandsaw Blade Twist

Post by Wood Butche » Wed, 27 Oct 2004 07:29:41


How about using a couple of crescent wrenches to
apply a reverse twist and straighten it out?

Art

Quote:

> A few days ago I managed to get a 3/8" bandsaw blade crossed up as I was
> finishing with a thick piece of hardwood.  Short story shorter, I ended up
> with a twist that is set into about 3" to 4" of its length.  I am guessing
> at it's worst its about a 10 to 20 degree twist.  I didn't realize until
> today that the "rattle" effect was too severe to leave it on the machine and
> swapped it out.

> Is there any Practical way to straighten one of these?  It is a fairly new
> and sharp blade.  Obviously sharper that the user.

> Thank you in advance for any advice.
> RonB

 
 
 

ADVICE: Bandsaw Blade Twist

Post by Ken Moo » Wed, 27 Oct 2004 10:17:23



Quote:
> How about using a couple of crescent wrenches to
> apply a reverse twist and straighten it out?

===================================
Either of the above methods will work, but there is the possibility that the
blade, either during the original twist or the straightening, will crack. If
you have a strong magnifier, take a look at the blade along the damaged
area. If it's cracked, save yourself the straightening time and just replace
it .

Ken Moon
Webberville, TX

 
 
 

ADVICE: Bandsaw Blade Twist

Post by Andy Dingle » Wed, 27 Oct 2004 21:23:59


Quote:

>Thank you in advance for any advice.

Try straightening it first. If you snap the blade, then you can make
yourself a bowsaw.
 
 
 

ADVICE: Bandsaw Blade Twist

Post by Leo Lichtma » Thu, 28 Oct 2004 01:36:03


(clip)
^^^^^^^^^^^^^^
This is a technique I have read about in the Old Tools Newsgroup, that works
on handsaws.  You press the blade against a hard, heavy surface, like the
top of an anvil, so it is held flat.  Then, tap gently with a small hammer.
The hammering stresses combine with the flattening stresses to make the
metal yield, so the blade is straightened.  For your blade, you might try
holding it with clamps and blocks while you do the pounding.

 
 
 

ADVICE: Bandsaw Blade Twist

Post by alan.. » Thu, 28 Oct 2004 03:39:03


Quote:

>A few days ago I managed to get a 3/8" bandsaw blade crossed up   snip

>Is there any Practical way to straighten one of these?  It is a fairly new
>and sharp blade.  Obviously sharper that the user.

     If you have enough adjustment in your tensioner you could cut the
twists out of the blade and silver solder it together.   You would
probably lose about 20mm of blade length
Alan
in beautiful Golden Bay, Western Oz,  South 32.25.42, East 115.45.44  GMT+8
  VK6 YAB ICQ 6581610   to reply, change oz to au in address
 
 
 

ADVICE: Bandsaw Blade Twist

Post by Bjarte Runderhei » Thu, 28 Oct 2004 05:19:17




Quote:

> >Thank you in advance for any advice.

> Try straightening it first. If you snap the blade, then you can make
> yourself a bowsaw.

Try straightening it _and_ snap the blade.

You will never get anything near satisfaction from a
*** blade.

Putting a bad blade in the machine, every time you need to
do a bad job, just is not worth your while.

Bjarte

 
 
 

ADVICE: Bandsaw Blade Twist

Post by A. Kemelm » Thu, 28 Oct 2004 06:50:38


From my experience of working with bandsaws it isn't worth the time or
effort trying to straighten out the blade. You'll never get it like it
was and it'll never cut as accurately. You might save a bit of money
in not buying a new blade but the frustration of working with the old
one isn't worth it. Sooner or later you'll buy a new one and kick
yourself for not having done so sooner.