design of an electric shocker

[meccanicamg]

pictures you see are from an excel sheet.

of my excel sheet for gears... more than 600 hours work..... when I have time I add and implement.

 

[meccanicamg]

It's a year project and it's organized like this: technical specification, morphological matrix for the choice of mechanisms and components, maximum calculations and choice of materials on the basis of maximum calculations.
therefore the materials must decide after the calculations of maximum according to the required performance.
I thought I would assume a value of sigma adm, calculate the module and repeat and then use that value of sigma adm found to choose the suitable material. I was thus organizing a sheet of excels. Maybe I can take values for verification and then after the choice of the material checks permanently.
The aim of our professor is to make us think and try not to block us from what has already been done and I must admit that a slasher is not the best choice in this sense but I have only realized it in the full of the project? I will try to do my best for calculations, thanks for the advice.
Can I ask you the pictures you showed me are from a program?

la technical specifications are the performance and operating characteristics of the shocker. can be found in household appliances manuals as reported before. morphological matrix of the mechanisms does not tell me anything except a political parolone. I believe it is the choice and discussion of why of the endless screw that breaks with two counter-rotating wheels etc.maximum calculations and choice of materials. would mean that you set the formulas in excel so that you have the formulas that subsequently automatically provide you the results including the conditions of control with the formulas "if this is greater or equal to....then". do not think to take an admissible sigma a priori and then look for the material because you have as the field of choice of all steels treated and not for the screw then loads of breakage from 300mpa to 1500mpa and for the wheels you have all steels, all bronzes and brass, all plastics for a traction break from 80mpa to 1500mpa. Moreover there are incompatibility of coupling of materials and incompatibility with types of lubricants.

remember that dimensioning can also be done randomly. is the verification that must be made scientifically. so I would directly insert form and number of principles and teeth and from there I would make attempts with all verifications.

for a magnification vsf wheel you need:
- bending tooth vsf
- schooling
- temperature
- wear
- bending screw

It is important that first prepare the geometric formulas of the screw and wheel, then with those you can already understand if more or less there are not the desired dimensions of interasses agitators or not.

other thing to keep in mind is that the screw is in contact with two screws, so the wear of the screw has double contact with normal formulas.

for plastics look at this dispensation chapter 2.6 and complete characteristics towards the end. is a school document for plastic materials in engineering use.

 

[Cadinpiedi]

I am perfectly aware that this is the forum of designers, and not that of designers. with a small search on the topic you can find hundreds of models...all equal, or better having the same identical layout. this means that it has been refined by hundreds of attempts and the most convenient mechanical solution is obviously this. However ergonomically it does not convince me, the lady luisa with a slight principle of arthritis, when it has to knock the eggs must move the joint of the shoulder to lift the object holding the high elbow, while if you could grab the tool with a front handle would do less fatigue, and then through an accessory bracket could hang the sbattitore to the wall.
How does the cinematic chain change with this layout? I don't know, I make the designer, engineers will think about it... and marketing has approved

 

[TETRASTORE]

Surely we are very out of classical computing standards and we should understand if there are specific regulations that can help us with plastics.

design of plastic gears according to kissoft.This interesting self-referential seminar, organized by kissoft in February 2020 at the Milan Polytechnic, shows the evolution of the regulations in this area, but highlights the many limitations that still exist in order to make a certified calculation.

 

[meccanicamg]

other thing you need to know is that the cutting of the endless screw can take place in three different ways, and each one finds slightly different formulas for the side profile: zi, za and zh.

what cadinpiedi actually says could be a point of reflection...that of changing ergonomics to decrease the impact on articulation. (that in designer sketches... They are fascinating.

regarding kisssoft surely you can have a good calculation result.
reading the explanations on vdi 2545 there is This is article with formulas that resumes the same that I posted before on plastics.

 

[TETRASTORE]

this means that it has been refined by hundreds of attempts and the most convenient mechanical solution is obviously this. However ergonomically it does not convince me, the lady luisa with a slight principle of arthritis, when it has to knock the eggs must move the joint of the shoulder to lift the object holding the high elbow, while if you could grab the tool with a front handle would do less fatigue, and then through an accessory bracket could hang the sbattitore to the wall.

I think the solution is definitely innovative and valid from the ergonomic point of view only if the tool is kept vertical.
if you look at a video about how a banger is used in certain applications as you can see in This video, I'm afraid that would be the pulse to be too stressed.

 

[Cadinpiedi]

Well the video hormone could knead the pizza with the finger, then the room frames the bowl from above, in this other

where the subject is less high it is understood that his attitude is different.
However, certainly yes, the tool must be kept vertical. there is a practical way to assess the working position, just take a kettle pot like the one I attach, grab the handle and imagine that the whips are in the usual blue usual position, or in the red vertical one.
It is immediately understandable that the arrangement changes, and the position of the arm placed on the side of the bust seems to me more firm. Then alternatively there is the wall fixing where only the bowl moves.

 

[Sisina]

I am perfectly aware that this is the forum of designers, and not that of designers. with a small search on the topic you can find hundreds of models...all equal, or better having the same identical layout. this means that it has been refined by hundreds of attempts and the most convenient mechanical solution is obviously this. However ergonomically it does not convince me, the lady luisa with a slight principle of arthritis, when it has to knock the eggs must move the joint of the shoulder to lift the object holding the high elbow, while if you could grab the tool with a front handle would do less fatigue, and then through an accessory bracket could hang the sbattitore to the wall.
How does the cinematic chain change with this layout? I don't know, I make the designer, engineers will think about it... and marketing has approved

In my opinion, the solution seems really convincing, but we must also take into account the psychological aspect that can affect the market. people are now accustomed to that type of design and also to the movement, although it seems a great idea from the point of view of a designer and a magai engineer can not be seen of good eye. then I think that in order to tilt to maybe put more strength you move anyway a little bit the shoulder.
in the case of my project I entrusted myself to reviews and asked friends and relatives to be able to make a list of needs to be respected, and no one brought this kind of problem afloat so I kept myself to classical design. But I found an interesting project of a designer. instead she has taken into account mostly of the movement of the wrist, and I am considering it in the final idea of layout. Would this type of handle be more uncomfortable than usual?

 

[Sisina]

I thank you very much for the answers and availability, there is a lot of information I have to take a look at calmly, I try before I understand and frame everything well and then proceed with the checks.

 

[meccanicamg]

In my opinion, the solution seems really convincing, but we must also take into account the psychological aspect that can affect the market. people are now accustomed to that type of design and also to the movement, although it seems a great idea from the point of view of a designer and a magai engineer can not be seen of good eye. then I think that in order to tilt to maybe put more strength you move anyway a little bit the shoulder.
in the case of my project I entrusted myself to reviews and asked friends and relatives to be able to make a list of needs to be respected, and no one brought this kind of problem afloat so I kept myself to classical design. But I found an interesting project of a designer. instead she has taken into account mostly of the movement of the wrist, and I am considering it in the final idea of layout. Would this type of handle be more uncomfortable than usual?View attachment 62409

with this system I think you can maintain more stability of maneuver and you will probably get less swinging vacuum.

 

[meccanicamg]

further observation: looking at the internet exchanges of different brands there is no endless screw wheel with classic curvature.So things are two:
- or are helical wheels with skewed axles
- is an endless screw and wheel with dot contact because the wheel does not embrace the tooth of the screw but only at one point, significantly worsening mechanical capacity

There's something to investigate.

 

[wert]

further observation: looking at the internet exchanges of different brands there is no endless screw wheel with classic curvature.View attachment 62412So things are two:
- or are helical wheels with skewed axles
- is an endless screw and wheel with dot contact because the wheel does not embrace the tooth of the screw but only at one point, significantly worsening mechanical capacity

There's something to investigate.

do not have the curvature because obtained from molding and the curvature would be a subsquadro. so are also the engine crowns that are typically used for wipers. as someone said, these products have a really low usage frequency, so they are not sized to get endless life.. .

 

[Cadinpiedi]

in the case of my project I entrusted myself to reviews and asked friends and relatives to be able to make a list of needs to be respected, and no one brought this kind of problem afloat so I kept myself to classical design.

Well it is a light and limited operation over time and luckily not everyone has arthritis like Mrs. Luisa
the concept you found is characterized by the fact that the user must grasp the entire body of the mixer, which cannot therefore have a diameter too large. miniaturization of components will be necessary with the probable reduction of installed power.
Let's see what colleagues think.
We must then distinguish between a study project and a commercial project that clearly have different ends, but I would like to break a launch in favour of innovation because it is on this factor that the global challenge is played.
the generation of designers who made the fortunes of made in italy in the sixties knew how to draw. all their projects were made with pencil paper and pastels because that was their knowledge integrated by historical artistic stratifications, and competition was limited to the West. (incidentally the fact that I said I was a designer was just a boutade to imitate the classic beating between designers and engineers!) today the competition at world level is fierce, the means are changed, everyone knows how to use the suites of adobe and cad modelers and every designer to emerge must point on new concepts.
In fact, just try and see that someone else has already thought about it, here are two examples of the concept that I have exposed:in the industrial reality the field is dominated by the Chinese components, as indicated by tetrastore in the link to alibaba where you see the standard motor:that is nothing but the one drawn by the Swedish university that I linked.
therefore at the productive level there is no history. the only possibility is to diversify and innovate, but attention now also the Chinese and Koreans are doing it. Just look at the design sites where the works are published, they are now full of Chinese and Koreans who publish excellent things, not to mention all the others.
moral: strength and courage, surely they will give you a hand!

 

[Cadinpiedi]

I really like this:

 

[wert]

I did not dwell on the student's proposal concerning the intention of making the grip handle become what would likely be the part where the engine is. in addition to the dimensional bond (difficult to descend under a certain diameter if you want to pair), it is necessary to consider that those engines have a very low yield and warm a lot. I would avoid that solution.

 

[TETRASTORE]

But I found an interesting project of a designer. instead she has taken into account mostly of the movement of the wrist, and I am considering it in the final idea of layout. Would this type of handle be more uncomfortable than usual?

observing the three positions of the hands, in particular the central one, from the finger position we can consider the presumed diameter of the device of about 40 mm.
unless the ergonomic study has been done by providing a smaller electric motor than those currently used (indicative diameter 55-60 mm), normally we would have a handle of a minimum diameter of 60-70 mm including the container, so it would be difficult to grip considering also that during the work planned the hands never have a perfect grip.

 

[meccanicamg]

just to have an idea of greatness put you what happens with conventional materials:View attachment 62403Surely we are very out of classical computing standards and we should understand if there are specific regulations that can help us with plastics.

trying to make calculation with khk gear calculator, we immediately bump into the rotational limit where more than 24000rpm does not allow to enter. for the geometric characteristics it limits again to little more than 3000rpm considering the steel screw and the wheel in nylatron mc901 or higher quality (pa6 series).
admitting to use this data and fix the speed to 20rpm in the input, we obtain that only for bending we can transmit up to 1nm in the input (we note that out there will be 1*40* Yield....)...using the formula of lewis more or less simplified and considering that the gears are spread of a good silicone fat.
so we can start from these dimensions to evaluate the rest of the mechanics.
certainly that this object....for those who are used to working with kw and mw ....I would say that it is very a toy and certainly replenished with particular theory and above all, as seen in several articles, of much experimentation.

 

[alen23]

Hello everyone, I just signed up.
I'm a student at the master of mechanical engineering. I'm designing an electric shocker and I have to do the maximum calculations but I don't know where to start. I chose a brushless motor and a transmission with endless screw and wheel. the only since I have is the speed of the whips then of the wheel that reaches up to 2000 rpm. I have assumed a number of teeth of the wheel of 40 and the number of principles of the screw pairs to 1, through the transmission ratio I found speed of the screw and therefore of the motor of 750o s^-1 = 72000 turns/min. I think it's very big as value because the power of this kind of appliances is about 400w, you think it's okay or I'm wrong somewhere?

while for the design of the endless screw can I proceed as for normal rotisms? that is through a iterative calculation then calculation mt, sigma adm, transversal module with formula of the helical wheels, ray of the screw, peripheral speed of the screw and remake everything until I find values of the module close to the unified one.

I don't know if I've asked too much or different topics? I hope it's okay

to size the screw you must keep in mind that the contact is dotform if the screw is not and globulidal or even if it is in all cases it is but more extended to the contact surface then for checking to wear the wheel I recommend you to apply the method of dot contact taking into account the strong heating of the wheel on the screw so as not to grip...