Re:Ask HN: Can you make me a 50 meter scroll saw blade?
by aconz2 on Wednesday January 04, 2023 @09:55PM
(#34255306)
Idk, not a welding expert, maybe you're trying to tell me it is a-okay? What about the heat affected zone? What welding process are you thinking?
> Any particular reason the reciprocating action of a normal scroll saw doesn't work for your application?
It works... just not well. Reciprocating is only 50% time efficient (only cutting on the down stroke!), wears out the blades by rubbing on the up stroke, and the very small length wears out quickly so they have to get changed often
Re:Ask HN: Can you make me a 50 meter scroll saw blade?
by moistly on Thursday January 05, 2023 @02:08PM
(#34264866)
Japanese pull saws have the kerf you seek and cut on both strokes. What they lack is the narrow depth that would allow for tight radius turns. Regardless, the tooth pattern for a scroll saw that cuts in both directions exists.
Re:Ask HN: Can you make me a 50 meter scroll saw blade?
by floxy on Thursday January 05, 2023 @06:08PM
(#34268300)
>What welding process are you thinking?
A pulse of GTAW. You can set your welder to just give a short duration weld pulse, and you'd have it set so that a single pulse would complete the weld on the saw blades without using filler material. Search on youtube for people welding razor blades together to get an idea.
Not if it was a fillerless weld.
>I'm pretty sure a weld would not hold
...thoughts on why a full-penetration weld not be as strong as the parent material?
>I'd guess the joint would also fatigue
This is based off of previous experiments? Conversations with a metallurgist? Other?
>The longer the blade, the longer you can cut before you have to rewind.
Any particular reason the reciprocating action of a normal scroll saw doesn't work for your application?