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Old 12-10-2010, 12:16 PM   post #1 of 25
2_Late_I_Won
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Default how to make a cone out of a cylinder

Ok so I'm going to attempt to make a unicorn log splitter. I have a very heavy duty 4" pipe I was wondering how to cut a piece of the pitpe out and bend it into a cone shape and weld it up. I'd also cut small pieces of round steel up to 4" to place inside the cone for extra support. Then I was going to cut screw threads into it and mount it to the PTO to split some wood. Any ideas? Or do you know where I can buy the unicorn piece already made (for cheap hint's the reason I'm trying to build my own) I was going to use an old paper towle roll to practice on but whouldn't you know they have all been put out with the trash last week. LOL Or if any of you could make me one fairly cheap let me know.

Thanks in advance

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Old 12-10-2010, 12:37 PM   post #2 of 25
Mike Milburn
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Default Re: how to make a cone out of a cylinder

Quote:
I was wondering how to cut a piece of the pitpe out and bend it into a cone shape ....
Can't, the flattened shape of a cone (frustrum is another name for a cone with it's tip cut off) looks like this http://tinyurl.com/2wkjnsf .
I shouldn't say can't but you'd have a lot of hammering ahead of you :-). If you'd don't mind hammering and heating: make a template for a cone that has a 4 1/2"bottom, (the od of the pipe) and a 1" or so od at the other end by whatever length you want. Wrap it around the pipe and cut it out, and then cut it in half along the length. The reason for this is that you have to be able to bend it to the smaller diameter which would be impossable in one piece.
If that's the route you want to go, post back and I'll give you the step by step to do it..Mike
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Last edited by Mike Milburn; 12-10-2010 at 12:43 PM.
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Old 12-10-2010, 01:19 PM   post #3 of 25
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Default Re: how to make a cone out of a cylinder

Well even if there was a hole at the tip I could just put a big screw and weld that in there. That way it would give me a good way to start the wood and get a good bit on it. Thanks yeah I'm still not 100% sure I want to tackle this yet LOL but I have an oxy/acc and a shop press I thought I might could bend it with that but like I said it may be more trouble than it's worth and at the end of it all (knowing me) I cut the threads in wrong LOL or it just doesn't work.
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Old 12-10-2010, 02:28 PM   post #4 of 25
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Default Re: how to make a cone out of a cylinder

Quote:
Originally Posted by 2_Late_I_Won View Post
Ok so I'm going to attempt to make a unicorn log splitter. I have a very heavy duty 4" pipe I was wondering how to cut a piece of the pitpe out and bend it into a cone shape and weld it up. I'd also cut small pieces of round steel up to 4" to place inside the cone for extra support. Then I was going to cut screw threads into it and mount it to the PTO to split some wood. Any ideas? Or do you know where I can buy the unicorn piece already made (for cheap hint's the reason I'm trying to build my own) I was going to use an old paper towle roll to practice on but whouldn't you know they have all been put out with the trash last week. LOL Or if any of you could make me one fairly cheap let me know.

Thanks in advance

Why not get a solid steel bar and Oxy\acetylene it down, grind it to perfection and weld it to wherever it needs mounted to.
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Old 12-10-2010, 03:06 PM   post #5 of 25
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Default Re: how to make a cone out of a cylinder

I don't think I can find one big enough to do that. but yeah that would be easiest for sure!!!
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Old 12-10-2010, 03:06 PM   post #6 of 25
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Default Re: how to make a cone out of a cylinder

Have you ever used one of these to split wood? Fella up the road from me had one, ended up snapping off his pro shaft , I thought it was dangerous ,I wouldn't go near the thing, it would wind into a piece of wood and lift the tractor off the ground on tough pieces....
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Old 12-10-2010, 03:10 PM   post #7 of 25
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Default Re: how to make a cone out of a cylinder

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Originally Posted by 2_Late_I_Won View Post
I don't think I can find one big enough to do that. but yeah that would be easiest for sure!!!
A well drilling place or construction supply company would be able to get you going.
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Old 12-10-2010, 03:19 PM   post #8 of 25
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Default Re: how to make a cone out of a cylinder

I wonder if you could have a shear pin that would break at a specified torque, although most tools are only as dangerous as the operator, a shear pin should help save the rest of the equipment.?

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Originally Posted by skyrydr2 View Post
Have you ever used one of these to split wood? Fella up the road from me had one, ended up snapping off his pro shaft , I thought it was dangerous ,I wouldn't go near the thing, it would wind into a piece of wood and lift the tractor off the ground on tough pieces....
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Old 12-10-2010, 03:28 PM   post #9 of 25
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Default Re: how to make a cone out of a cylinder

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I wonder if you could have a shear pin that would break at a specified torque, although most tools are only as dangerous as the operator, a shear pin should help save the rest of the equipment.?
Yes but then you would need to have

< (this) attached with -- (that, a shaft that a receiver for the screw) so it goes up in complication, and trial and error would be the only way to figure out the strength needed for the sheer pin.

TOTALLY doable but would take some engineering effort.
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Old 12-10-2010, 03:52 PM   post #10 of 25
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Default Re: how to make a cone out of a cylinder

The only one of these splitters I've ever seen used was marginal at best unless the wood was straight grained, easy splitting, like fir or cedar.

The owner had built this machine and was still trying to get it where it worked well. He had added a truck transmission ahead of the cone so he could reverse the direction when things got jammed up. Without this feature he said he often had to chop the piece of wood off the cone when it would start slipping.

Way easier to build a hydraulic splitter. More expensive but it works.

Mike
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Old 12-10-2010, 03:58 PM   post #11 of 25
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Default Re: how to make a cone out of a cylinder

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The only one of these splitters I've ever seen used was marginal at best unless the wood was straight grained, easy splitting, like fir or cedar.

The owner had built this machine and was still trying to get it where it worked well. He had added a truck transmission ahead of the cone so he could reverse the direction when things got jammed up. Without this feature he said he often had to chop the piece of wood off the cone when it would start slipping.

Way easier to build a hydraulic splitter. More expensive but it works.

Mike
Junkyard build how to -

Steering fluid pump from a 3\4 ton truck (preferably)
Rack and pinion from same truck (preferably)

Steel I beam from anywhere (1\2in preferably)
tractor axle\old trailer.

Mount rack and pinion on one end facing the length of the I beam.
Weld needed mounts and brackets, make plate to mount engine, weld\mount chain drive to both engine and steering plump.

Much more involved than that but that's a basic picture of it.
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Old 12-10-2010, 03:59 PM   post #12 of 25
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Default Re: how to make a cone out of a cylinder

I can't help but think it might be easier to just use a wedge and weld that on to your piston.
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Old 12-10-2010, 04:26 PM   post #13 of 25
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Default Re: how to make a cone out of a cylinder

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I can't help but think it might be easier to just use a wedge and weld that on to your piston.
Just a rough overview of how to do it cheaply.
A wedge would be needed of course as well as a back stop, hydraulic controls and lines.
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Old 12-10-2010, 08:18 PM   post #14 of 25
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Default Re: how to make a cone out of a cylinder

Good point about the PTO and shear pin. Heres what I'll be splitting. Might just rent a splitter for $60.00 or so.




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Old 12-10-2010, 09:20 PM   post #15 of 25
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Default Re: how to make a cone out of a cylinder

I think the $60 would be well spent.
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