Chinaman hat,

[snowcat]

Ok, have got a couple of chinaman hats to make (as a favour) from copper, Question I havent made any cones since collage and cant rember the layout fomular, If anyone can Id much appriciate it

 

[Drains]

Working radius is the slanting edge, to pointy tip (the hypotenuse, on a half plan of the cone) - draw a circle at that rad.

For length of edge, you can multiply the diameter of the base of the cone by 3 and 1/7.(pie) Measure off around drawn circle with tape measure, strip of thin steel etc etc.

Or use dividers - 12ths of base of cone dia will be accurate enough, apply same to the drawn circle.

Add on your lap joint etc. Cut.

If that's not clear enough, I can scan the relevant pages...

 

[snowcat]

thanks si think thats clear enouth, had a routh idea but had forgot the mesureing fomular... Think i might cut on card first tho

 

[zardoz]

Er but what is a chinaman hat ?

 

[Drains]

Er but what is a chinaman hat ?

Remember that cap that Chairman Mao wore? A bit like that

 

[snowcat]

Think chimneys zardox, last one I made was when I did my C&G.... some years back now:

 

[Hitch]

I hate doing cones. Shallow ones are easier...

Especially if it isnt size critical

 

[snowcat]

Shallow ones are easier...

The problem is he wants chinaman hats, not dunce's hats

 

[Hitch]

Chinamans hats, are shallow cones.... dunces hats are steep cones surely..

 

[Hitch]

Keep your eye out for 'the geometry of sheet metalwork'

I refer to it when i get stuck

 

[snowcat]

Keep your eye out for 'the geometry of sheet metalwork'

I refer to it when i get stuck

Me mate dug me out his step by step metalwork book's tnight he was awarded them as a prize in 1966 as an apprentice great stuff in there refering lots to aspestos gloves... I thought some of my referance stuff was old, I guess your right on the dunces vs chinamans hat

 

[kezajones]

ive got a cone layout program i can email you if you want,