There is no activity in the 'Blacksmiths' group, hence I am always asking
I cannot even mark a leaf spring (OCS) on my bench drill press. How
does one drill them? Special bit or does one have to de-temper them first?
I also have to weld it 'cuz it is broken near the middle but since it
will be used as the 'beam on a homemade power hammer, the break will be in
the 'sandwich' of 1/2" plates holding the rocking bearings. The center hole
would just hold it firmly where I want it.
thank to all for any assistance. . .chas
Yes, if your drill press isn't making a mark on it, you could soften the
steel by heating it past magnetic and then letting to cool slowly. It will
still be harder than mild steel however even after annealing like that.
You might also just need to sharpen your bit or buy a new one.
While it's hot, you could also punch a hole instead of drilling it.
You can try a cobalt drill bit.
They are less likely to shatter than carbide drill bits.
Welding a leaf spring is really not recommended.
If it is trapped inside the bundle, it might work.
You will need to double bevel the joint.
That means a groove on both sides.
Warm the ends up to the point where motor oil smokes if dripped on the
steel (about 500 degF)
Weld with 7018 rod or MIG.
Tack one side, weld the other side, then weld the tacked side.
That should keep it kind of straight.
Let the weld area cool slowly by burying it in sand, powdered lime or
wrapping it in an old wool blanket.
Then grind off the weld bead so the leaves will stack correctly.
Diamond core drills come in two main types, ones which cost about $5 and
ones which cost about $25. The difference is in how the diamonds are
attached, in the cheap ones the diamonds are sort-of glued on, in the
more expensive ones the diamonds are embedded in the metal.
The cheaper ones will most likely cut a leaf spring, though they have to
be used carefully as the attached diamonds may break off in lumps, and
they are pants for interrupted cuts; the more expensive ones definitely
will cut a leaf spring.
Use in a drill press, high speed, lots of water to cool and lubricate.
You can use a clay or putty dam for the water, but no water = bye-bye
drill. It's more a grinding action than a cutting action.
Note I am talking about diamond core drills, not diamond-coated twist
drills, which are different (the latter are used for cutting abrasive,
but not necessarily hard, materials).
Ernirwe would know most about that, but maybe try and find an unbroken
one in a scrappy rather than welding?
-- Peter Fairbrother
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.