design construction toothed wheel

[Sandalhpon]

Good morning to all, my name is ivan and I am 38 years old, after a long period of stay I returned to the books and shortly I will support the examination of maturity to become mechanical and mechatronic expert. I have a good problem, by the 5th I have to deliver an elaborate and, among the various things, I have to carry a constructive design of a toothed wheel. normally drawing with paper and parallelographer, unfortunately having followed a iter from privatist and having the time that the work left me I had to leave the cad part, also because the diploma needed me only to better understand some branches of my work, it was not my intention to become a designer. Anyway, I got hurt in my hand and I can't draw and this is the first problem, the second is that, today's news, the commission wants the elaborate done to the cad. Luckily I passed a notebook with installed solidwork 2020 and freecad, I'm trying to put on something but my limits are obvious. I absolutely do not want to learn how to use such complex programs in a handful of days, but I must be able to build a toothed wheel and put it on the table. I know I'm asking a lot and with a lot of money, but could you help me out? At the moment I came to create a toothed wheel with freecad, with solidwork I could not place the housing of the wrench in axis with one of the teeth, I wanted to make sure that in the section you see the tooth well, only that when I dissect it on the table does not distinguish between the tooth and the full wheel. Anyway, every advice, tutorial, guide, insult is well accepted. thanks to all and sorry for the trouble

 

[MassiVonWeizen]

party also qua.

sezione ruote dentate

Ciao a tutti, alcuni di voi avranno sicuramente già letto la discussione nella sezione "studenti ingegneria meccanica". Ho ora un problema con sw 2007, mi sembra giusto postare la domanda qui: Una volta fatta la messa in tavola di un assieme (per la cronaca si tratta di un riduttore ad assi...

www.cad3d.it

if you started with freecad it is best to continue with that especially if you know how to use little both

I don't recommend it because it's a wrong use, but if you're just fruit use the design environment of freecad or solidworks as if it were a tecnigraph and draw the wheel directly with the sketch tools without first building the 3d model. just like last beach

 

[Sandalhpon]

Many thanks, now I go to work and then tonight we start the tour de force. Thank you again.

 

[meccanicamg]

for now what you have to explain if you really have to draw a toothed wheel with its "real" teeth or if you have to or can make the representation simplified as a rule.

simplified representation of straight, helical and bi-helical cylindrical wheels:if you design cn solidworks and you have to do the simplified view you don't have to do the teeth but extrusions without joining the bodies, so when sections you can choose the tooth compartment of "don't dissect" changing the sampling in "no one".
If you do the real teeth... what comes.

 

[Sandalhpon]

Thanks for the answer. then, the text only requires the technical design of a toothed wheel, when the hand drawing use the representation as a rule adding only one tooth in the upper part in axis with the tongue quarry. I wanted to try to make a toothed wheel full of teeth, I followed a tutorial to build it directly from the circumferences but the author, during the construction to get to trace the evolved, says to take a point but actually takes another one, and from there I lose myself. I started working on it last night so I have a luggage of 9 hours post and pre-turn in the factory, just above 0. tonight I'll get back to the strong work of your councils, thank you

 

[MassiVonWeizen]

with solidwork I could not place the housing of the key in axis with one of the teeth, I wanted to make sure that in the section you see the tooth well, only that when I go to dissect it in the table does not distinguish between the tooth and the full wheel

apart from that if you follow the link I indicated in post #2 you already have the indications of how to make a part file that represents the wheel
However if you already have the side file you are halfway.
to make the seat of the key you just have to make an extruded cut:
-selections one of the two faces of the wheel
-open a new sketch
-drawn a rectangle and the ties to the tooth
-quote the rectangle
- Open the extrusion cut command.

 

[Sandalhpon]

Thank you, as soon as I get home, I get to work.

 

[meccanicamg]

Thanks for the answer. then, the text only requires the technical design of a toothed wheel, when the hand drawing use the representation as a rule adding only one tooth in the upper part in axis with the tongue quarry. I wanted to try to make a toothed wheel full of teeth, I followed a tutorial to build it directly from the circumferences but the author, during the construction to get to trace the evolved, says to take a point but actually takes another one, and from there I lose myself. I started working on it last night so I have a luggage of 9 hours post and pre-turn in the factory, just above 0. tonight I'll get back to the strong work of your councils, thank you

if you use freecad you must directly use the workbench fcgear which is the module to draw in 3d directly the gears. I talked about it several times on the forum and on youtube find the tutorials.
the freecad table has two modules, a little acerbi for a professional representation.
for the tab I would say that if you generate gears with software modules (toolbox for solidworks and wb fcgear for freecad) you will always have a different tooth in phase with or four quadrants and then you can orientate the cut rectangle in that direction.
It is however not recommended to carry out the manual modeling of the teeth because it does not make much sense especially if not done properly.
the important thing that there must be on the drawing at the table, is the indication of the parameters of the gear (module, number of teeth, primitive diameter, external diameter, bottom diameter, pressure angle and helix..... )

 

[Sandalhpon]

Thank you, I'm going to do some evidence tonight, and I'm going to look for the other discussions you're talking about. Thank you very much.
one last thing, to insert roughness and tolerances can I do it directly after transposition into the table or should I add its 3d model?

 

[meccanicamg]

Thank you, I'm going to do some evidence tonight, and I'm going to look for the other discussions you're talking about. Thank you very much.
one last thing, to insert roughness and tolerances can I do it directly after transposition into the table or should I add its 3d model?

roughness, tolerances and notes must be put strictly in table 2d.
3d only serves to make the solid model.

 

[Sandalhpon]

Many thanks again. as soon as I draw out something I will show you the fruit of my efforts combined with that of your precious indications

 

[Sandalhpon]

I understand, now I'm going to bed that I'm devastated, tomorrow I'll make you progress

 

[Sandalhpon]

Good morning! My night labors produced this, I know it is less than decorative but at least it is a start! I was very helpful, especially to start understanding some basic functions of solidwork. thank you all, do not be too strict please

 

[MassiVonWeizen]

the part file I can't open it, but I can tell you immediately that the pdf design has many errors.
1 technological and functional error: a hole does not quote with the radius and especially if you put a tolerance h7 will be very different from a h7 on a diameter
2 technological error: the seat of the key of a hole is not listed in that way. how is it possible to take as reference of the depth a edge that is created after processing? find dozens of dispensers, even in the forum, on how to quote a venue and the respective tolerance.
3 technological error: the roughness of 1.6 on the outer diameter makes little sense because it does not work the top of the tooth, but the sides of the teeth.
4 technological error: wrinkle from 0.8 on the sides of the wheel makes little sense unless there is a very precise coupling with another element. 25 is therefore not tolerated.
5 technological error: missing roughness on hole and key seat
is much easier to put a general roughness of 1.6 and specify 3.2 for wheel hips and key seat
6 technological and functional error: in the front view is not represented a tooth and the center of the key can be made in any position. you have stated that it must be in a board so it would be quite a serious mistake

7 program error: roughness should be attached to the surface not through the director. is sufficient, after triggered the annotation, select the edge

in the table what does 3:1 scale mean?
I hope not the scale of representation of the drawing

 

[Sandalhpon]

perfect thanks for corrections, I immediately provide

 

[ramjet]

Could you post the pdf of the drawing? My pc doesn't open the rar format and I'm curious to see the massive fixes.
Thank you.

 

[MassiVonWeizen]

ecco il pdf

 

[ramjet]

downloaded, thanks.

I add: the line of primitive circumference is mixed (long short stretch) : in the front view the line is continuous while the basic circumference is mixed.
the table of the toothed wheel is defined by the rules and the items listed are placed in the right order: in the table the precise order is missing and there are several entries (reference identity? tolerances? Juoco?).
I believe there are problems even with the sampling of the section: that represented is typical of rubber and not of metals

 

[MassiVonWeizen]

in the front view the line is continuous while the basic circumference is mixed.

I had initially made this reasoning, but then I projected them with the pdf reader from one view to the other, the lines that are seen are:
- Continue the edge of the bevel
-tracted the primitive diameter
therefore lacks the line of the bottom diameter

the toothed wheel table is defined by the rules and the items listed are placed in the right order

I didn't know that. Can you bring the rule back? Thank you.

I believe there are problems even with the sampling of the section: that represented is typical of rubber and not of metals

that is the typical sampling of steel in solidwork i.e. steel and steel cast iron din 201norm religion 201 sostituita da iso 128-3:2020 defines the type of restraint of the various materials

 

[meccanicamg]

It would be enough to take a technical drawing book and compare whether the reproduction is identical or not...yes so you can understand whether it is good or bad.

there are several errors and/or ways not properly suited.
It is true that soldworks does as standard sampling that with two sections space two strokes... but it is not that iso of the "iron card".
the diameters are quoted with relative tolerances.
symbols of roughness to be avoided (support arrows..... although somehow I can be used).
you have to change the types of lines because the primitive diameter cannot be represented by continuous line.
missing indication of the material of the wheel, possible treatment and relative hardness.
the scale is wrong because 3:1 means that you have 3 times enlarged the natural dimensions....you need an a1 to represent it.

Forgive me, but one who "can draw in pencil and parallel....so...." means that the rules of drawing know them.
It's like writing in pencil or computer, but spelling errors are the same... they know or don't know independently of the instrument.

Is it the same?