Stainless Cone

[Gizmo.Y]

If i'm honest richard, i don't understand it, Mathmatics isn't my strong point.

 

[Richard.]

That's fair enough mate. Here is your drawing based on 2" inch small 2.5" big and 10"long.
It's a rough hand drawn sketch but I'm sure you could make it nice and to scale.
Edit the centre line showing the radius should go all the way to the datum point but my paper wasn't big enough lol. The dimensions are all there.

 

[Brad93]

We often do cones with angled ends so those are mapped out on A3 paper then templated to check, then sent to laser cutters

 

[brightspark]

We often do cones with angled ends so those are mapped out on A3 paper then templated to check, then sent to laser cutters

give him a price then

 

[Paul G]

Errr Richard.......

You did work to the mean diameter didn't you ??


Tut tut, go to the back of the class.

 

[Paul.]

Errr Richard.......

You did work to the mean diameter didn't you ??


Tut tut, go to the back of the class.

Don't go giving away all the trade secrets Paul, gotta keep some mystery in the job.

 

[Paul G]

Don't go giving away all the trade secrets Paul, gotta keep some mystery in the job.

You mean, I should be mean, and not mention the mean ?

That's mean.

 

[Paul.]

There are various ways of developing cones, either by drawing or some simple maths, but for anyone who cant add up or draw I have made a simple calculator for right cones in a spreadsheet to calculate the angle of the frustum shown as "O" here, all you do is find the point of intersection to get the true length then enter the values in the yellow fields and it will update with the angle, useful for cones that are bigger than your paper or printer
Its on my website, if anyone wants it ask and I'll tell you where to find it, but don't forget to use the mean diameter

 

[Richard.]

Errr Richard.......

You did work to the mean diameter didn't you ??


Tut tut, go to the back of the class.

It's all worked out. Check it mate. She adds up true.

 

[Richard.]

Bottom cone diameter x pie = a
Top cone diameter x pie. =b
A-b=c
Cone length x a =d
D / C = top radius.
Top radius - cone length = bottom radius.
Draw it out using a and b as your top and bottom widths and you'll find it's near on bang on.

Ok so I've used the outside diameter in this case. Take 1.6mm off both daimeters for the mean and do it again. Back to school yes.

 

[beelzedub]

There are various ways of developing cones, either by drawing or some simple maths, but for anyone who cant add up or draw I have made a simple calculator for right cones in a spreadsheet to calculate the angle of the frustum shown as "O" here, all you do is find the point of intersection to get the true length then enter the values in the yellow fields and it will update with the angle, useful for cones that are bigger than your paper or printer
Its on my website, if anyone wants it ask and I'll tell you where to find it, but don't forget to use the mean
View attachment 119318

thats how i draw out my cones, however there are apps now that can do it for you. the one i use gets it perfect everytime.

 

[dixiethedog]

As much as I love the idea of making thing's could you not just buy and use an already made item??

I was looking at one of my fave Chinese web sales sites and found as an example these;

https://www.aliexpress.com/item/Mot...lgo_pvid=535062d7-7250-4777-9576-75edc234fd98

 

[dixiethedog]

If I had scrolled down the page further I would have no doubt found some even cheaper version's. Maybe worth a look???

 

[Gizmo.Y]

i did see those, in the end i went for a small transition cone into 2.5" straight tubing.