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good morning to all, can someone help me in this design? i find myself with a professor who cannot help me do this exercise

  • Thread starter Thread starter carlosiltopochegira
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carlosiltopochegira

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a rotating table is enlivened with toothed wheel system– rack. the table
rotating is opposed to rotation with a moment of 40 nm, and can carry out
a maximum rotation of 270° in 5s.
- the sizing of the system.
 
It would also be useful for me to introduce you so as to know who you are talking to and how to use a common language.
 
you are right, I am a fifth student and I am trying to perform this exercise. from the data provided, assuming a module and the number of teeth. I can't do anything else because the professor has not explained this subject, but has delivered this exercise to me.
 
hypothesize the module and the number of teeth I can dimensional the wheel to a certain point, finding its geometry.
 
with the explanations of the forum maybe you will be able to measure what is required, but you will hardly understand what you are doing if you do not have the basics of the topic and when asked by the professor you will climb on the mirrors or you will make a silent scene.
if really the professor did not explain the topic of exercise discutine with him and try to perore your cause; If you don't get anything over it and bring the problem to the attention of your superior. It is an examination with a vote that will affect the annual performance and it is your right to be in the conditions of performing it.
attention that teachers keep track of the topics covered during the lessons and say: "has not treated him" to apologize for not understanding him/her, in front of a principal he/she could be recused with ease
carlosiltopochegira said:
hypothesize the module and the number of teeth I can dimensional the wheel to a certain point, finding its geometry.
Click to expand...
Where's the pattern? Where are the calculations?
 
the sizing of a toothed wheel I know to do, the problem is that I have never performed a sizing of this type and with this data. I'll have to take this exercise to the exam so I can't do it, if anyone can help me, I'd be very grateful.
 
do you have to dimension only rack and toothed wheel or even the system that moves it? I suppose it's a pneumatic cylinder or a hydraulic cylinder. . .
 
PIETRO2002 said:
do you have to dimension only rack and toothed wheel or even the system that moves it? I suppose it's a pneumatic cylinder or a hydraulic cylinder. . .
Click to expand...
I have to design the wheel and the rack, while for the power part, according to the necessary power I will have to choose the correct actuator and electric motor.
 
as he wrote massive, without a scheme you cannot understand what it is. If it were a canonical rotating table, the rack should move the solidary gear to the table. then transform a linear movement into rotation. Therefore the rack should be moved by a linear actuator. You're talking about engine... then, given the final couple, you have to dimension the primitive of the gear (the radius becomes the lever arm) and establish the tangential force to be applied to the rack. That said, I repeat, you should post a scheme and then you can continue shipped.
 
carlosiltopochegira said:
I have to design the wheel and the rack, while for the power part, according to the necessary power I will have to choose the correct actuator and electric motor.
Click to expand...
Hi.
you start posting pictures of the wheel and rack, with the relative calculations you are capable of.
this is the first step to ask for a minimum of help.
 
carlosiltopochegira said:
you are right, I am a fifth student and I am trying to perform this exercise. from the data provided, assuming a module and the number of teeth. I can't do anything else because the professor not having explained this topic, he handed me this exercise anyway.
Click to expand...
This phrase was also used in my time is dated and unbelievable.
Come on. Let us at least benefit from the doubt;)
 
try to impose a gear with a certain module and a given number of teeth, hypothesize the material and verify it, then assuming to use a pneumatic cylinder that will action you the rack, calculates the diameter of the cylinder you need, imposing a certain operating pressure that will be provided to you by the compressed air network, then calculates the stroke that the cylinder must have.
Let us see some calculations.
go to give a peek to some catalog of rotary actuators from trade, festo, smc... Just search the internet for a lot.
 
They told you everything.

first thing: method.

the method requires simplified scheme to have cinematism in the head and see that you have to deal with force, arm, swept corner in time units.

refine your system: think that handling is not instantaneous but there are acceleration ramps. I think it's a little further, but it's the exact way.

pinion/cremagliera sizing by assuming a module and checking or depending on the torque/turns obtain the minimum module, round for excess et voilà.

sizing actuator of the linear motion ....which will then be a nice pneumatic cylinder....the air arrives to no more than 6 bars ...in reality with the compressors that there are in some places manco 5bar arrive.
 
PIETRO2002 said:
try to impose a gear with a certain module and a given number of teeth, hypothesize the material and verify it, then assuming to use a pneumatic cylinder that will action you the rack, calculates the diameter of the cylinder you need, imposing a certain operating pressure that will be provided to you by the compressed air network, then calculates the stroke that the cylinder must have.
Let us see some calculations.
go to give a peek to some catalog of rotary actuators from trade, festo, smc... Just search the internet for a lot.
Click to expand...
if you look well on the forum you will find everything: lazy/cremagliera formulas, check lewis, picks pistons....but also on a good manual.... but also with google.
 
I've already prepared a excel to check out the sizing speech. I took about 15 minutes with the phone. I would say that in less than an hour you should be able to solve everything.

if you have clear ideas, you have to use simple formulas to have the first necessary quantities.

done that, there is only to make specific calculations for gears and then for piston.

now proponi....with reasoning, so we can see and understand together where the opposite is.
 
then we can also discuss the speech of using racks of commerce.... which have b=m and other practical things.

The sprocket rotates....it doesn't turn....but a fraction. the development of the primitive diameter if the coils and put it linear is the race of the rack... and therefore of the piston. Air pistons have standard alesments. definition of couple....you have strength. apply it to the tooth which is a cloaked shelf....
 

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