Flat drawing of a drum with tooth

3D Design Volume Model
1

Hello

We are currently making a drum on which we have to weld teeth. (see attached image)

In order to facilitate the work of the boilermaker, I would like to mark the location of the tine holders on the drum "flat".

The goal is to provide a scale 1 sheet to the welder that he will wrap around the drum and he will only have to mark the location before welding.

Do you have any idea how I could proceed?


tambour_avec_dents.png
2

Hello

Is the drum without the teeth a tube or a bent sheet metal???

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3

Hello

I would advise you to project the contact surface of the teeth onto the drum, then unfold your drum and finally draw it.

If your drum pattern isn't that big, you can try printing it on a sheet of tracing paper in A4 or A3.

All you have to do now is wrap the layer around the drum and transfer the shapes to it. If you have a problem transferring the shapes you can either cut them out so you can use a pencil/marker, or point the corners [with a compass] and then transfer the corners with a pencil/marker

Here

4

Hello

Thank you for your quick answers.

The drum is composed of a 330mm diameter tube and 525 mm long. Given the number of adapters I wanted a solution with the tube to avoid having to redo the assembly.

But I think I'll have to convert the tube to sheet metal, redo the assembly, project the surfaces of the adapters onto the sheet metal and make an unfolded state of it.

5

If it is a tube, according to the technique dear to GT22, it must be possible to make a roll-up surface.

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6

If in your means of production vius with a laser; Why not make a production template? Like a flat with the openings to place your teeth with openings for pointing and on each side a kind of comb that caps the teeth in place to position the next ones...

7

Don't forget to redo everything, you just have to make one configuration of your sheet metal tube for the template and keep the other one for assembly...

8

The template for positioning is a good idea but we don't have the tools to make it.

I now have my sheet metal drum. Whether I work in assembly or in derived parts, I can't find the solution to project the surface of the tool holder onto the surface of the sheet metal. The two surfaces being cylindrical, I don't have a sketch to project.

Is there an intersection function of two surfaces or close to it?

 

 

9

I think that projection via a 3D sketch should be possible: Link

10

I think the simplest

is to create a surface on the outer part

taking into account the perimeter of the teeth 

Create a dividing line

and via the Flat Surface tool

You have your own installation template for your teeth

@+ ;-)

4 Likes
11

Hello

@gt22 @d.Ludovic , @Ac cobra and @Stefbeno

You're lucky to understand because personally I oscillate between how to make the plan - which is very simple - and how to do it in the workshop, which is not simpler.

Question:

- is the PB to make the plan to do the machining

- How is the PB how to make the part in the workshop once I have the gauge and the tube to be machined?

The heat wave must have made me heat the decanter (sorry) and the condensation must be short-circuiting

Kind regards

12

Hi @ Zozo 

It requires the creation of an installation template to define the correct placement of the teeth

So a perforated sheet metal to allow the workshop pros to trace  the base of the teeth to be able to weld them

@+

 

13

Hello @gt22

Thank you ;-)

It's curious, it seems simpler to me to make a tool with a lathe and a milling machine.

Marking with a gauge is not very precise, especially with welding, which tends to move the parts.

It depends on the precision of the positioning of the teeth and especially what these teeth are for. It also depends on the number of drums to be made 1 or 50, or even more, these are not the same processes to be implemented.

Well, let's wait for Kevin to tell us more.  ;-)

Kind regards

 

14

Given the type of part, it looks like the planing drum used to remove asphalt from roads (the famous grooving), so the precision should not be huge, however, the quantity to be produced is to be specified.
Rather than paper whose lifespan in the workshop will be symbolic, I would prefer a 5/10 or 10/10th sheet metal cut with a laser and pointed at the drum.

1 Like
15

Hi everyone

My initial goal was to make a (flat) drawing of the location of the teeth, print the sheet on a scale of 1 and wrap it around the tube in the workshop. The welder thus obtains all the positions of the teeth. All he has to do is mark the locations, remove the sheet and finally weld the teeth. (I hope to be clearer in the explanation).

We currently have 2 drums to make with each about a hundred teeth to weld.

I didn't really understand the 3D sketching projection method and as I didn't have time to search I finally made a 2D plan by inserting the locations manually afterwards with calculating the lengths of arcs corresponding to the angles between the teeth. This is less precise and a bit long but acceptable for the parts to be made and has allowed us to move forward.

However, I would still like to succeed in making this drawing with the methods you have proposed to me.

16

What version is your tube and teeth file in?

if SW 2017 or inf

post it and I'll make you your installation template as I defined it in my previous message

@+

17

Having previously done boilermaking, the idea of stefbeno seems to me the most suitable for the situation. To know that paper as a template in a workshop, it's not going to last long!!!!  

18

Hello

I had time to deepen the technique of gt22 and to do it correctly. The play is now finished.

Thank you all for your help.

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19

Just a note for the following: the surface flattening function is only available in the Premium version.

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