On Tue, 5 Mar 2019 11:53:10 -0600, Terry Coombs
wrote:

On 3/5/2019 11:30 AM, Terry Coombs wrote:
* This morning I braved the cold to make an alignment block so I could
try welding that broken bandsaw blade . Milled a half inch wide by
.023" deep slot down the length of a piece of aluminum ingot (from
melted scrap) followed by a quarter inch slot along one edge , .050"
deep , for tooth clearance . Added a .050 deep cross slot in the
middle for clearance under the blade so shield gas could get down
there . I clamped the blade with the ends just touching using a couple
of short bar clamps - which will be replaced with a screw and washer -
and welded it at about 12 amps using some 1/16" ER312 . Tested it on a
piece of half inch steel 2" wide cutting thru the half inch dimension
. Left it cutting for a quick run into the house and when I came back
the blade had stalled . I checked , I hadn't ground the blade all the
way back to original thickness and it was hanging in the cut . Couple
of minutes with the Dremel and we be jammin' now . I'm not planning on
making my own bands , but it sure is handy to be able to repair one if
needed - I did melt a couple of teeth , so this band will not be used
for stock under 1/4" .

*Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !

* Oops , spoke too soon . It broke on the second cut right at the weld
. I'm not sure if it's because of my filler selection or because I
didn't anneal it afterward . But hey , I still got the block and
somewhere around here is a coil of silver solder . So not a totally
wasted morning anyway .

Be sure you anneal after welding. Just give it some heat until it
almost turns red..almost..and let it cool.

The weldment its brittle as hell if you dont. Sounds like you are
getting the hang of it if you finished the first cut. You even found
out what happens if you dont grind it to thickness. Keep trying..you
may get it proper.

Gunner
__

"Poor widdle Wudy...mentally ill, lies constantly, doesnt know who he is, or even what gender "he" is.

No more pathetic creature has ever walked the earth. But...he is locked into a mental hospital for the safety of the public.

Which is a very good thing."

Asun rauhassa, valmistaudun sotaan.


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