maneuver screw

[Vittorio]

that I know.. the threading of the jacks is usually at a fine pace, this ensures greater resistance/wear for lifting heavy loads because there are more threads per unit length.
you could use a bar from m16x1.5

 

[Marco F inox]

As long as you can connect the two jacks with recordable distance, that the crank does not cause distancing or approaching between the two units, remains a serious problem of stability.
from the design placed, there are four bases so small that a possible overturn is almost guaranteed, without considering that the plates that lean on the car, must always adapt to the shape of the shell, with evident movements not always symmetrical.
it would be good to use a base of support on square ground, with side at least equal to the height of lifting from the ground, or the side of an equilateral triangle between base and lifting point.

 

[Marco F inox]

that I know.. the threading of the jacks is usually at a fine pace, this ensures greater resistance/wear for lifting heavy loads because there are more threads per unit length.
you could use a bar from m16x1.5

the tensile strength of any screw, in its matrix, develops for a length about equal to its diameter, the rest of the matrix is influential.
the dice are constructed with a height proportional to the diameter of the thread, precisely for this reason.
only for particular needs, such as space, they build low or prolonged dice.
it comes that, at equal diameter, a larger thread has more and more resistance than a small thread. as every round has an ever greater contact surface with the mother-in-law.

 

[Vittorio]

the tensile strength of any screw, in its matrix, develops for a length about equal to its diameter, the rest of the matrix is influential.
.

Of course you know this.
regarding the jack in question. .
a fine step, at equal diameter, has more threads of a big step and this also reduces the wear of the fillets and the effort to lift.
If I go to develop the propeller of a fine step I get a plan less tilted than a big step.
translated for what goes on bike... , I have a less steep climb to face and therefore with less effort but with a greater time.

 

[andrea1974]

the tensile strength of any screw, in its matrix, develops for a length about equal to its diameter, the rest of the matrix is influential.
the dice are constructed with a height proportional to the diameter of the thread, precisely for this reason.
only for particular needs, such as space, they build low or prolonged dice.
it comes that, at equal diameter, a larger thread has more and more resistance than a small thread. as every round has an ever greater contact surface with the mother-in-law.

As long as you can connect the two jacks with recordable distance, that the crank does not cause distancing or approaching between the two units, remains a serious problem of stability.
from the design placed, there are four bases so small that a possible overturn is almost guaranteed, without considering that the plates that lean on the car, must always adapt to the shape of the shell, with evident movements not always symmetrical.
it would be good to use a base of support on square ground, with side at least equal to the height of lifting from the ground, or the side of an equilateral triangle between base and lifting point.

I will connect the two ends with two square tubes inside each other, so that they are recordable and transmit the rotary motion. Then I'll put four columns on it, and I'll put the load on it so it'll be stable. Clearly the structure is unstable, but it only serves to lift the car.

 

[andrea1974]

In my case, fine or big, it's influential. putting a bar from m 12 making 1.75 big step if I put it fine step changes very little effort. I believe that by greater diameters would feel the difference. I care a lot more about the instability of the structure. .

 

[andrea1974]

It seems dangerous to me to use fir beams to make a lifting device, you say it will be very robust, but how do you verify it, what guarantees do you have?

Well they are 8 wheel beams of 50x70 mm long section 350 mm that have to support 400 kg. 400 /8 are 50 kg each. I don't think he breaks. each pin has to support 25 kg. it makes it comfortable.

 

[Vittorio]

Well they are 8 wheel beams of 50x70 mm long section 350 mm that have to support 400 kg. 400 /8 are 50 kg each. I don't think he breaks. each pin has to support 25 kg. it makes it comfortable.

I think you can't make such simple divisions.
your jack's support base is too small.
wooden pallets support tons, but have very large surfaces on which to distribute weight.
Come on. We would like to read you often on this forum and we would like to read you in the newspapers as an accident at work

 

[andrea1974]

The base is not too small, the weight is discharged on the four pins that keep it on the ground, how do you say it's not okay? rather than unstable once you lift the car this yes. but there are 4 columns below.

 

[Vittorio]

The base is not too small, the weight is discharged on the four pins that keep it on the ground, how do you say it's not okay? rather than unstable once you lift the car this yes. but there are 4 columns below.

by means of support I mean this

My curiosity... What size do they have?

then the 4 columns supporting the jack rest on the floor?

 

[andrea1974]

Now exactly I don't remember but it's about 150x150 I think.. .
the columns do not lean on the floor, but inside the base from 150x150, so the lifting point to stabilize the car because in theory only you can raise it... They are made in two pieces so that they can be mounted in there...
p.s.: These are old pictures, I've already modified it, it's not like this anymore. :
I'm in version 25 of the axieme by now, I keep changing something all the time, but I'm almost... I'm done. And I also built it in half as we say... meanwhile.

 

[Vittorio]

I'm in version 25 of the axieme by now, I keep changing something all the time, but I'm almost... I'm done. and I have built it already in half say... meanwhile

then update us on the latest release. so you involve us in your project. the opinions of all are always interesting.

 

[andrea1974]

So, Saturday I did a lifting test with scrap pieces that I had available, I built a double triangle bordered at the top and connected to the base with the double threaded right/sx and turning it manages to lift the car fairly easily. Agreed that then broke once a cross and once again the wooden block that keeps on everything but were small pieces... I was interested in trying whether the m12 bar is doing it or you plant it and it looks like it works. Now I'll make the pieces and then proceed to the assembly. .

 

[meccanicamg]

So, Saturday I did a lifting test with scrap pieces that I had available, I built a double triangle bordered at the top and connected to the base with the double threaded right/sx and turning it manages to lift the car fairly easily. Agreed that then broke once a cross and once again the wooden block that keeps on everything but were small pieces... I was interested in trying whether the m12 bar is doing it or you plant it and it looks like it works. Now I'll make the pieces and then proceed to the assembly. .

And the car didn't break?

 

[andrea1974]

What do you mean? No waits for the car didn't fall down, only he gave the wood but it stayed up, however the bar works, I was only interested in that for now.