cinematic design

[rollingdownariver]

Hello, everyone.
I'm facing a problem I can't solve.
I have to carry out a vertical linear movement of 450 mm of a weight of 5 kg. what I'm trying to do is to make sure that even with the use of levers or more or less complex cinematisms, I can use a spring that compensates me for the force in play so that an operator performs with the least effort this movement. there are already compensators with belt spring but force to exercise at the beginning of the 450 mm race is too different from what needs to be exercised at the end of the race. if at first I have to exercise 5.1 kg force after 450 mm I can also have to exercise 5.9 kg strength. I think there is a system with levers that allows a much smaller variation.
Can anyone help me?

 

[gerod]

Hello, and welcome.
1. First of all I invite you to read the rules of the forum.
a minimum presentation is the least you can do when entering a group!
2. a box would not be bad, since what you describe is understood but maybe some detail would not be bad.
3. who does the movement, the operator or a servomechanism? Maybe a cylinder?
I'll throw there...
Hi.

 

[cacciatorino]

if at first I have to exercise 5.1 kg force after 450 mm I can also have to exercise 5.9 kg strength. I think there is a system with levers that allows a much smaller variation.

apart from the difference between 5.1 and 5.9 already seems to me a great result, you could see if you get better results with a gas spring. cylinder discourse as gerod said can go as long as you insert a large storage tank into the circuit or a servovalve (type smc series vx) to maintain constant pressure within the cylinder chamber regardless of volume variations.

Bye.

 

[gerod]

Oh, but how much strength does the man have to exercise?
if they are few pounds and few times a day should not be a problem, according to you 81/08!!

The gas spring would be a great compromise!
Good hunting

 

[stefanobruno]

I'm facing a problem I can't solve.
I have to carry out a vertical linear movement of 450 mm of a weight of 5 kg.

If the weight is always applied and if you have space, there is nothing better than a counterweight.

Bye.

 

[rollingdownariver]

Actually the gas spring only has the problem that has a high static friction. the counterweight would only be good that the 5 kilos are not a fixed, but variable from time to time. I am looking for greater compensation because for the position and for the application the operator can sometimes use even only a finger, and also only half a kilo of differences can be a problem.
Meanwhile, thank you all for your cooperation. I hope I can make a change! !

 

[rollingdownariver]

to understand the p1 point from the highest position to the lowest would make 450 mm running (it is not important that it has a horizontal translation compost). the spring so positioned “would” compensate for the vertical force applied on p1 that among other things in this case would increase the couple applied half height and would fall into the highest and lowest points. It is an example that does not work, only to give a possible point to understand also the problem, I am now fried and for 2 days “I give it to pile”.
Thank you and hello.

 

[sampom]

there are already compensators with belt spring but force to exercise at the beginning of the 450 mm race is too different from what needs to be exercised at the end of the race.

the fact is that with a spring the result will always be that.
and it is worth the same speech of the counterweight (which at least always gives you a "continuous resistance" throughout the race); if you do not always have the same fixed load value as you do to establish that spring to use to always have the same minimum effort to exercise?

with leverages you may get a certain "progression" in the drive, but basically do not solve your problem. .

Let's try to think about it better. .

greetings
Mar

 

[rollingdownariver]

You're right.
In fact, the load may vary but before you start a second movie, in other words each row takes place at constant load. the spring can be preloaded before the beginning of each movement, as if it were a calibration. remains the fact that the spring still gives a change of force along the race.

 

[rero]

another solution could be a sliding balance (type elevator) or a hydraulic accumulator as in machine tools.

 

[rust]

odds=rollingdownariver;117647]you are right.
In fact, the load may vary but before you start a second movie, in other words each row takes place at constant load. the spring can be preloaded before the beginning of each movement, as if it were a calibration. remains the fact that the spring still gives a change of force along the race.[/QUOTE]Hi.
if I count myself the easiest way remains the counterweight, if you can adjust the preceric of the spring before each cycle you can also think of varying the weight of the counterweight with the precision you want... to get to an excess you can turn it into a tank where you add/toile according to your needs.

other possibility always if you want the adjustment is to use a double stem cylinder (or without stem) and to connect the two rooms with an adjustable strozer (remains the problem of the first detachment friction)

But some extra details you have to give it, otherwise we throw things that do not have a tail.

 

[sampom]

Hi.
if I count myself the easiest way remains the counterweight, if you can adjust the preceric of the spring before each cycle you can also think of varying the weight of the counterweight with the precision you want... .

Or move it along a lever arm. .

all true the rest you suggest.

greetings
Mar