LumberJocks

Fixing bandsaw blades -- What am I doing wrong!??

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by totalrewind posted 09-18-2015 08:26 PM 716 views 0 times favorited 5 replies Add to Favorites Watch
View totalrewind's profile

totalrewind

22 posts in 1733 days


09-18-2015 08:26 PM

Topic tags/keywords: bandsaw blade

Hello all,

I’ve seen some videos online where people make/fix their own bandsaw blades by silver soldering/brazing.
(Examples:
https://www.youtube.com/watch?v=mzKSk_Zs0Ew
https://www.youtube.com/watch?v=mq4UmoTKPwY)

So I went ahead and ordered some silver solder (not the tin junk from the hw store, but the real, expensive silver-bearing stuff), and some of the 601 flux the guys from the videos seem to like.

I cut the scarf, sand it, flux it up, apply solder, allow to cool… and the blade snaps like a twig.

So I try again, getting the blade red hot this time and backing off slowly when done to keep the metal soft…
still snaps! Grrr!

It seems to flow together fine when I do it. In fact, after it breaks, I see even solder inside the joint, but for some reason it just won’t hold! Any idea what I’m doing wrong!??


5 replies so far

View Dallas's profile

Dallas

3599 posts in 1948 days


#1 posted 09-18-2015 08:45 PM

I have only soldered a few blades so I don’t have a lot of experience, but could it be you are cooling the joint too quickly?
It seems to me that when a blade breaks, the cause is usually because it has work hardened, or another way to think of it is because it became brittle.

When I have soldered a blade I usually heat the metal that holds it and let the blade cool as the extra mass does.

I am probably wrong, but it seems to be what works for me.

-- Improvise.... Adapt...... Overcome!

View Dallas's profile

Dallas

3599 posts in 1948 days


#2 posted 09-18-2015 08:47 PM

By the way, are your repairs due to a broken blade or because of cutting and making a new blade?

If the blade broke, it normally is because the metal became hardened.

Good luk.

-- Improvise.... Adapt...... Overcome!

View totalrewind's profile

totalrewind

22 posts in 1733 days


#3 posted 09-19-2015 02:38 AM

Yes, old blade. Also I’m using a piece of aluminum to line up the halves. Maybe it’s wicking heat away?
Anyway, I’ll insulate it a little and try again tomorrow.

Thanks for all the input so far.

View ElChe's profile

ElChe

630 posts in 797 days


#4 posted 09-19-2015 04:37 AM

No clue how to solder a blade. Interesting topic. I have a 131.5” basically brand new kerfmaster resaw blade 5/8” that I ruined doing something stupid bending about 10” of it. It got stuck in a piece of wood and got bent in a small area. So if anyone wants a free kerfmaster blade to cut out the ruined 10” and weld or solder back to less than 120” PM me. It’s similar to a woodslicer blade. You can have it for actual shipping cost if you want it. Or a six pack of beer. Or a good hot dog with relish.

-- Tom - Measure twice cut once. Then measure again. Curse. Fudge.

View totalrewind's profile

totalrewind

22 posts in 1733 days


#5 posted 09-20-2015 11:38 PM

Eureka!

I was grinding about a 45 degree angle on the blade halves, but then upon closer inspection it turns out that the other people were doing a much, much shallower angle for more overlap.

I went so far as to even have the tooth on one half overlap a tooth on the other.

Obviously you can’t play that game very many times before the blade will be too short to fit, but for now it worked!

Thanks for your input, jocks!

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com