Metalworking

[derfledermauseParticipant @derfledermause]

How to make a cone?.

[derfledermauseParticipant @derfledermause]

Hello,

I wish to make a cone out of thin metal sheet, Heinz baked bean cans actually. A standard cone has the apex sited over the base circle centre. I require that the apex of the cone be over the edge of the base circle, looking at the side elevation it would look like a right angled triangle. I have searched the net and there are many sites that make standard cones but non to make the type I require. I know it can be done, in my apprenticeship an old blacksmith made two of these for the bow of two pontoons. Unfortunately I cannot remember how it was done, if someone out there can put me on the right track I would be eternally greateful.

Thank you,

derfledermause.

 

[Kimosubby ShipyardsParticipant @kimosubbyshipyards]

You can obviously make an “apex centred cone”, which has the base perpendicular to the vertical height line.

Make one out of A4 paper and temporarily tape it together.

Tilt the cone to one side such that the apex is vertical over the circumference of the base. With the extra pair of hands, draw a line parallel to the horizontal about the cone, this will then give you the basic shape template for creating off centred cones.

 

By experimentation you will achieve the size and height for the project.

 

Kimosubby

[Kimosubby ShipyardsParticipant @kimosubbyshipyards]

Here’s the previous post as a diagram, it might help some?

 

You may need to go to the albums to get a better image.

 

Kimosubby

 

 

[JC Uknz 1Participant @jcuknz1]

If you first make the centred cone and then raise it at the join between the edges until the other side is vertical.

Hopefully find a book or block of wood slightly lower, the distance between the lead of the pencil you have and its outside, than the height need to raise cone side to vertical.

Traverse the pencil set-up around the cone.*

open cone and cut along pencil mark and you have the template for the cone you want to make. If it needs to be bigger or smaller then you could get a plan printing shop to copy and adjust the printed size for you. If it is smaller than A4 or A3 you could probably scale it in your computer?

Printers today often will make same sized prints using several sheets if it is bigger than A4.

*You may well have the proper gadget for doing this marking out in your workshop?

I think it is known as a height gauge? Model boaties use one to drawn waterlines along their hulls.

This in my ignorance, I don’t know how to make the centred cone in the first place, strikes me as being a bit more accurate than the drawing above?

 

Oh DEAR!  I’ve just noticed Kimo… told you all that with fewer words already

Edited By JC Uknz on 24/03/2011 08:09:50

Edited By JC Uknz on 24/03/2011 08:13:07

[derfledermauseParticipant @derfledermause]

Gentlemen,

May I thank you for the many replies, I have in fact used the “make it out of paper method” and it works OK. All I need now are some large tin cans to obtain the required sheet to make them and when finished, to attach them to the booms. Basically the vessel is a catamaran made with Heinz baked beans cans.

regards,

derfledermause.

 

[Kimosubby ShipyardsParticipant @kimosubbyshipyards]

So there could be 57 different versions then!

 

Kimosubby

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