Is there a tool that puts tremendous force on metal, like to pinch the end of a steel rod so that it flattens out a little?
If it's well-known, I guess all I need is the name.
I would like to put the steel rod through a hole and then pinch the end of the rod so that it does not come out of the hole.
I picked up a bolt cutter thinking it might compress the steel rod as it cuts. But it actually stretched the end of the steel rod so that the diameter was less after the part broke off. I guess a powerful enough bolt cutter with a dull attachment on the end?
You should be able to adjust the cutting head on your bolt cutter so that it does not cut through the rod, but rather just mashes the end.
A sledge hammer and an anvil or other heavy steel block to strike the rod on.
The next step might be a shaped anvil in a hydraulic press.
If you have a bunch to do, look into punch press.
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Thanks, I'm encouraged that it will work. I'm thinking maybe to flatten grind part of the bolt cutter jaws.
I would like to be able to do the pinching when the rod is in place (I can't do that on an anvil).
John Doe wrote:
The best question is why? What is the application??
There are things like roll pins, tapered pins, welders, and... the friction fit (also can be done as the heat one part, freeze the other!)
A hydraulic press and the two parts made the right size should do the trick... of course this depends on the application.
And, also does the pin need to rotate free or not?
John Doe wrote:
This could be done in a few seconds with an oxyacetylene torch and a hammer. Heat the end of the rod to red (won't take very long with a real O/A torch), put steel block up to the back of the rod, WHACK the end is flat. Even easier if you have an anvil or substitute.
Partly out of curiosity and very generally/typically speaking. Which, bolt cutters or a vise, is able to apply more pressure?
I've seen pressure data for vises, but I suspect that information isn't usually given for bolt cutters.
This would be a matter of the construction of the bolt cutter and the strength of the individual, versus the limiting strength of the vise - I assume that the strength of someone turning the vise handle would not be limiting.
a) the bolt cutter is a two-handed type with handles 20 inches from the pivot, and the jaws 2 inches away b) the strength of a pair of arms squeezing together is similar to that for the press-up motion c) the person operating the bolt cutter can do a single press-up with a weight equal to his own on his back d) the person weighs 150 lbs
then the force at the jaws is about a ton and a half. Get a big guy mad and a bigger bolt cutter and maybe you could get close to ten tons.
The last time I broke a vise the casting broke, but I don't want to bother doing that math, so instead I looked up the strength of a 3/4 inch grade 5 bolt as that would be a typical small vise size; it's roughly 20 tons.
Then factor in the difference in force-per-square-inch applied to the rod by a narrow bolt cutter jaw vs a wide vice jaw.
Ooo, err, that'd make a hulluva big difference.
(now remembering some possibly-true story about fat ladies, stilletto heels, and aeroplane floors...)
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You're comparing apples and oranges here - the mechanical advantage of a bolt cutter to the ultimate strength of the screw in a vise. Also neglected is the fact that bolt cutters use compound leverage to generate the cutting force.
I just took a few quick measurements from a pair of 30" bolt cutters and a 4" Wilton bench vise. I get about a 65:1 mechanical advantage for the bolt cutters, and approx 170:1 for the vise. Taking into account the fact that an acme screw might be 40% efficient on a good day, the MA of the two tools is not all that different.
Try rotating the bolt cutter 90 deg so it is trying to split the rod lengthwise.
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And the reason this is a great suggestion is obvious to anyone who has done any smithing with a cross pein hammer.
It sounded really great to me. But my metal doesn't cooperate, it crumbles instead of bends. I tried cutting a slot in the end of the rod, but it still breaks when the bolt cutter is used to separate the two halves.
I only need to do this twice, so (instead of flattening my bolt cutter blade) I might spin the rod against a rotary tool cut off disk to make a slot, then cut a notch in a washer and crimp the washer into the slot. A washer crimps surprisingly well.
Thanks for all the interaction, bye.