Designing Automatic door opener without electric

 Above represents the mechanical door that open it self without power from any electric or disel motor... once the car gets on the platform the weight of the car lowers the ramp and which will pull the connection rod down which will make the cross door open.

below is cad drawing which illustrate the design.

white lines show how it will be open when the car go on top of the yellow lines, yellow lines represents the ramp which the car will pass over. the green line shows the tension rod which will pull the pink lines making it white lines. 

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Putzmeister concrete pump

The eSmart Range is equipped with Human Machine Interface (HMI) control panel that has the IFM Display, which allows the driver to  determine the real time operating status of the machine and diagnosing faults. The IFM displays the various parameters which allows to continuously monitor the, pump. Thanks to a reba ble faiult management system, the machine can be fully operational in the event of a failure, and even in emergency operations. Up-to-date feedback and system information for the machine appear in real time on the 
display.

Safety Features
-  The er ' ergency switch on the control panel is very easy to access.  It stops the entire operation of the mulching when pressed in case
of emergency,
- RSA-Grill Safety switch - if the hopper grill is open, the pump and agitator will not operate arid will prevent accident.

Oil Saver
The 0PS design drastically reduces the operational costs. The BSA  eSmart product range requires only 70-1 00 litres of hydraulic oil-thanks to the Open Pumping System (0PS). Due to this revolutionary OPS system, the consumption of hydraulic oil gets reduced by 70-1 00 litres which is almost 3.5 times lesser compared to the oii needed for an equivalent machine from other brands (internal oil change remains the same i.e. 500 pumping hours or 1500-2000 engine hours). This spectacular reducHon In hydraulic oil will give you lifelong savings on every hydraulic oil change.

If you have purchases plan for putzmeister visit Putzmeister.com

How to do concrete without a batching plant

concrete been mixed with a european brand winget mixer model 500R and a chinese mixer model JZM500, CAT excavator, excavator bucket is measured and used for loading sand and aggregate to hopper of mixers, kobelco rk250 crane and a tadano TR250 crane been used for hosiitng the buckets and pouring to the second slab. All equipments from YD WORKS, www.yd-mv.com
See the vedio for beter view

For this concrete they been using grade 53 cement, 750 bags of 50kg, and 75 tons of manufacture or crushed aggregate and 113 tons if aggregate. Mixing at a avrage speed of 100 bags per hour.

do you know which brand of concrete pump and batching plant is best? for me i find Putzmeister as best brand around. more about putzmeister in another post.

How to build your own model sail ship

Watch how i completed 90% of my old sail sgip model tbat took over a year due to my busy sgedual at work..  https://youtu.be/DRdnDCAVa9g

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Worked example on how to calculate particle size analysis of soil

To evaluate: the quality of a soil as a highway subgrade material, one must also inmrporate a number called the grop index (Gi) with the groups and subgroup the soil. This index is written in parentheses after the group or subgroup designation.

The group index is given by the: equation

Equation 

Example

The results of the particle-size analysis of a soil are as follows:

- Percent passing through the No 10 sieve 100
- Percent passing through the No 40 sieve - 80
- Percent passing through the No 200 sieve

The liquid limit and plasticity index of the minus No. 40 fraction of the soil are 30 and 10, respectively. Classify the soil by the AASHTO system.

Solution
Using Table 3.1, since 58% of the soil is passing through the No. 200 sieve. it falls under silt-clay classifications - that is, it falls under group A-4, A-5, A-6, or A-7.

Proceeding from left to right, it falls under group A-4.
From Eq. (3.1)

Gi = (F200-35) + 0.005(LL - 40)) + 0.01(F200 - 15)(Pi-10)
= (58 - 35)(o.2 + o.o05(30 - 40)) + (o.o1)(58 - 15)(1o - 1o)
=3.45~3

So. the soil will be classified as A-4(3).

Classification of highway sub grade soil

Drilling a hole on a MS sheet

What is the minimum sapce that we need to keep between hole or edge minimal distance? BS or british standard indicatea that it is nessasry to keep 1.4xD (D stands for diameter of hole that your drilling)

This is plate where we need to drill for 42mm dia  bolt.. so just to fit it we are gonna drill a 45mm dia meter hole on a 25mm ms sheet... so

1.4 x d=  1.4x45= 63mm
As u can see..  center of hole to safe edge distance is 63mm

Distance between 2 hole to be 2.5xD , where D is diameter of the hole.

Below is from code of practice BS code
6.2.1 Bolt spacing
6.2.1.1 minimum spacing

For standard clearance holes or holes for fitted bolts the spacing between centres of bolts should not be less than 2.5d. where d is the nominal diameter ofthe bolts- For oversize holes or slotted holes the hole sparing  should be increased to leave at least tbe same width of steel clear between the holes as for standard clearance holes.