Making a shear...

[bignissan]

Can I just get the tooling for an ironworker and make my own shear using a bottle jack and such? I would like to shear 1/4" most often---3/8" would be nice, but I don't see that happening. I need to get my books out and see how much pressure I need to shear the 1/4", but I was just wondering if it would work??? I know it would be slow, but a lot nicer than a cut-off saw or band saw.

[bignissan]

also, a punch like that would be nice as well....

[big97redtj]

Originally Posted by bignissan

Can I just get the tooling for an ironworker and make my own shear using a bottle jack and such? I would like to shear 1/4" most often---3/8" would be nice, but I don't see that happening. I need to get my books out and see how much pressure I need to shear the 1/4", but I was just wondering if it would work??? I know it would be slow, but a lot nicer than a cut-off saw or band saw.

It all depends on the rake of the upper knife and the seperation distance between the blades. Rule of thumb is 7%-10% of material thickness for the gap.

[bignissan]

i need 17.3 tons of pressure to shear 3/8"x3" plate

[PTSchram]

I'd think you could get the tooling for your hydraulic press and mount the dies in it and go from there.

[glfredrick]

I found at one time an article on making a home sheer but can't find it right now. If I find it I will post it for you.

Here is a press brake made in a similar fashion to what you are contemplating.

http://www.frugalmachinist.com/pb.html

Here is a comercial one that might let you figure out some plans.

http://www.medfordtools.com/metalproironworkers.html

[MiniMog]

We made our own sheet metal shear and a small bench top plate break for our shop and they work tits. I will try to get a few picks up as soon as I can. We were considering selling the plate break as a kit that you weld, bolt together for the less serious fabricator, you know the guy that can hang an axle and weld on perches but can't make his own tooling.

I have a design for a hydraulic 40 ton sheer in my head but I am stuck on the blade....do you think a scraper blade off a snow plow blade would work? Its hardened and already drilled for botls etc....anyone?

[Murph]

Originally Posted by MiniMog

I have a design for a hydraulic 40 ton sheer in my head but I am stuck on the blade....do you think a scraper blade off a snow plow blade would work? Its hardened and already drilled for botls etc....anyone?

It would probably be hard enough, but what about the edge? Will it leave a clean cut, or will the edge of the material be rounded or otherwise deformed?


Andy

[bignissan]

Originally Posted by Murph

It would probably be hard enough, but what about the edge? Will it leave a clean cut, or will the edge of the material be rounded or otherwise deformed?


Andy

that would depend on the clearance wouldn't it? As long as the edge was sharp, I don't see why it wouldn't work....great ideas!
Greg

[MiniMog]

Snow plow blades are never rounded, they scrape cement their entire life leaving a flat (though angled) surface. They are usually available as cast offs when they get to short for plowing snow from being worn down....

Hell a snow plow from a truck has a bunch of good uses, the controller and pump runs my bender ram.

[LoveMyToy]

Originally Posted by MiniMog

We made our own sheet metal shear and a small bench top plate break for our shop and they work tits. I will try to get a few picks up as soon as I can.

Could I get some pics of this? I'm planning on making a plate break and can't find many good pics... Something small like a benchtop design might be useful.

Brian

[LoveMyToy]

Btt