motoGP early schedule

Yay, my only favorite game is back. This year might give a wonderful bike-to-bike fight between Valentino Rossi aka.The Doctor VS his ex teammate Jorge Lorenzo.

These last 2 years,I've been rooting for Valentino Rossi because of a simple reason, he rides Yamaha, and so do I. But this year, I might as well vote for Rossi again, not for much reason, only because I like the combination of Italian rider and Italian motorcycle. Not much to say again.

Date                                        Grand Prix (Circuit)
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tolerances - geometric tolerance

Geometric dimensioning and tolerancing (GD&T) is used to define the nominal (theoretically perfect) geometry of parts and assemblies, to define the allowable variation in form and possibly size of individual features, and to define the allowable variation between features. Dimensioning and tolerancing and geometric dimensioning and tolerancing specifications are used as follows:

• Dimensioning specifications define the nominal, as-modeled or as-intended geometry. One example is a basic dimension.
• Tolerancing specifications define the allowable variation for the form and possibly the size of individual features, and the allowable variation in orientation and location between features. Two examples are linear dimensions and feature control frames using a datum reference (both shown above).

There are some fundamental rules that need to be applied :

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list - gruesome torture device 02

Yeah, here comes the second part, another 10 torture device. Like what was stated in previous post. I'd like to try one of this on Mr.terrorist. of course they would not be given death. cause..well, death penalty is unavailable. Let them living in pain, in the other hand, i think is a brilliant choice.
These cruel instruments were commonly used throughout history to punish criminals, exert power over others and strike fear in the immoral and corrupt. Be sure to save that meal of yours for later; this is going to make your stomach churn
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list - gruesome torture device 01

I found this list accidentally when browsing. Yeah we all know, sometimes when we heard or see crime news in TV, such as murder and terrorism, it's hard to keep yourself calm. Death penalty, of course is not available in my country. But a simple prison punishment would be too easy for the evil-doers. So are there any other  possibilities?

Torture: it is an ancient practice that still goes on today. In the middle ages torture was used for punishment, interrogation, and deterrence. It is easy to consider ourselves more humane these days, but while some of the devices listed here would lead to death, we have, in modern times, mastered the ability of inflicting extreme pain for indefinite periods of time – something which is, perhaps, worse.

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gear technology - cycloid

The word Cycloid, with its adjective Cycloidal, is derived fromHypocycloid which describes the curve traced by a point on the circumference of a smaller circle rotating inside the circumference of a larger fixed circle

GEAR RATIO CALCULATION

The reduction rate of the cycloidal drive is obtained from the following formula, where P means the number of the ring gear pins and L is the number of pins on the cycloidal disc.

Ratio = (P - L) / L

Where P = Number of ring gear pins/rollers
             L = Number of lobes on a cycloidal disc

The method of operation is just like this :

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belt drive technology - basic belt types

A belt is a loop of flexible material used to link two or more rotating shafts mechanically. Belts may be used as a source of motion, to transmit powerefficiently, or to track relative movement. Belts are looped over pulleys. In a two pulley system, the belt can either drive the pulleys in the same direction, or the belt may be crossed, so that the direction of the shafts is opposite. As a source of motion, a conveyor belt is one application where the belt is adapted to continually carry a load between two points.

Belts are the cheapest utility for power transmission between shafts that may not be axially aligned. Power transmission is achieved by specially designed belts and pulleys. The demands on a belt drive transmission system are large and this has led to many variations on the theme. They run smoothly and with little noise, and cushion motor and bearings against load changes, albeit with less strength than gears or chains. However, improvements in belt engineering allow use of belts in systems that only formerly allowed chains or gears.
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bearing technology - rolling element bearing

A rolling-element bearing is a bearing which carries a load by placing round elements between the two pieces. The relative motion of the pieces causes the round elements to roll with very little rolling resistance and with little sliding.
Most rolling element bearings use cages to keep the balls separate. This reduces wear and friction, since it avoids the balls rubbing against each other as they roll, and precludes them from jamming
Even though some other kind of bearings are better in one or another specific attributes, many people think that it gives a pretty good tradeoff between cost, size, weight, capacity and durability. Therefore, it is one of the most widely used in machinery design
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bearing technology - plain bearing

A plain bearing, also known as a plane bearing, is the simplest type of bearing, comprising just a bearing surface and no rolling elements. Therefore the journal (i.e., the part of the shaft in contact with the bearing) slides over the bearing surface. The simplest example of a plain bearing is a shaft rotating in a hole. A simple linear bearing can be a pair of flat surfaces designed to allow motion; e.g., a drawer and the slides it rests on or the ways on the bed of a lathe.

Plain bearings, in general, are the least expensive type of bearing. They are also compact, light weight, and have a high load-carrying capacity. Read more

gear technology - harmonic drive

A Harmonic Drive (also known as "Strain Wave Gearing") is a special type of mechanical gear system that can improve certain characteristics compared to traditional gearing systems (such as Helical Gears or Planetary Gears). Basically it uses the flexibility of metal as the main component of mechanism

The mechanism is comprised of three components:
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gear technology - epicyclic/ planetary

Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, orsun gear. Typically, the planet gears are mounted on a movable arm or carrier which itself may rotate relative to the sun gear. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears.

The axes of all gears are usually parallel and what's more is that the sun, planet carrier and annulus axes are usually concentric
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belt drive technology - design and usage guideline

Unlike many old machines that employs gears for transmission method, Newer machines began to grow fond using belt drive, since it's cheaper, offers safety (belts will break on overload, unlike gears that take everything down with it) , easier to apply and it's easier for maintenance. One thing that we might forgot to highlight is that the belt drive efficiency actually depends a lot in heat factor.

Lifetime and performance in timing belts are greatly affected by the type of reinforcement employed. This internal component largely determines belt strength (modulus), creep, flex fatigue, and length variability (caused by humidity and temperature variation). Even though timing belt drives are generally considered to be very efficient, the operating temperatures they are exposed to can have a significant effect. Elastomers that run well hot will generally become much stiffer at low temperatures. This reduces drive efficiency as more energy is required to bend the belt around the pulleys. Elastomers that flex at lower temperatures are available, but they often wear too quickly at mid-range and elevated temperatures.
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solidworks - creating a forming tool

Not everyone interested in sheetmetal, but I've been looking at sheetmetal products likely such as stamping and curious how the SW users make the design. One thing should be noted is that whatever you bend in the sheetmetal feature, will be available in the flat pattern, so you only need to make the correct design, and you could see the flat pattern with just one click

The only thing that bothers me, is what will we do if we have customized stamping tool,that are not available in SW library? the answer was simple, we can make it and put it in our library
This is how you do it:
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