25.06.16

CNC Laser diode

CNC Laser diode




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Diode Pumped High Peak Power Quasi Q-Switched and Passively Q-Switched Nd:YVO4 Lasers at 1064 nm and 532 nm Using Cr:YAG and KTP Crystals


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Engineering Radio Control Aircraft Structures for Light Weight, Strength and Rigidity








Introduction to Building a Model Aircraft Wing

Designing a Lightweight Model Airplane

Fuselage Design

Tail and Flying Surface Design





Engineering Choices

Heavy models are almost always poorly engineered.  A well engineered model can still end up heavy due to poor material and equipment selection or poor building techniques.  Even so, a properly engineered model at least gives you a fighting chance.  A poorly engineered model is usually a lost cause unless you take it back to the drawing board and redesign the entire model.
Poor engineering usually is due to one or more of the following:
  • The designer doesn't understand model aircraft structures and over-designs.
    The designer copies poor engineering concepts of other bad designers or he comes up with all new poor concepts of his own.
  • The design is compromised to ease building at the expense of additional weight.
  • Poor strength-to-weight materials are used to decrease costs to the manufacturer.  Additional cheap and heavy material is added to compensate for lack of strength which in turn adds more weight.
Any model having lite-plywood fuselage sides is weaker and heavier than the same model would be if it had properly engineered balsa wood sides.  Even if the plywood sides have large cut-outs, Warren truss fuselage construction is lighter while attaining a higher strength-to-weight ratio.

Builders have become so lazy over the years that any time they discuss a model having built-up fuselage sides, the kit is called a builder's kit meaning that the kit is only for "true builders."  Call it what you want, but one fact will never change lighter models fly better.

If you aren't willing to do the work to build a lightweight aircraft then don't be surprised when your models don't fly as well as those built by builders who are willing to make the effort.

What I can't figure out is how the new generation of 3D models that have just a handful of ribs having large cut-outs and a profile fuselage weighs as much or more than a "real" airplane that I build that has 20+ ribs in a larger wing.  Actually I do know why and here's a clue.  Contest balsa ribs don't weigh anything.  You could put 50 of them in a wing and it wouldn't make but (at most) an ounce of difference in the finished weight.

The lack of ribs in 3D aircraft is only to give the illusion of light weight.  More ribs make a more durable wing having a more accurate airfoil.  You get all of this at no weight penalty.

To counter this supposedly lightweight wing, the designers take a thick (heavy) slab of balsa, slap on some plywood (heavier) around the nose and call it a fuselage.  So much for the weight savings of having only 4 ribs in the wing!

And by the way, take a look at the size of the leading edge and spars on some of these 3D planks.  They are much larger and heavier than what is normally used on more traditional wings.  Heavy spars weigh more than light ribs.





CNC wood cutting and laser engraving services






CNC wood cutting and laser engraving ideas

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neDPSS laser (red či blue)






Parametry laserových diod a jejich měření

Pro běžné využití stačí změření výstupního výkonu na PWM s tolerancí <±5%





400mW RGY = 290mW
100mW G = 60mW

--
minimální výkon udávaný v specifikaci,  RGY měl guaranteed 300mW, čekal jsem 400mW
a dostal jsem 290mW ... :o

---
100mW/532nm a realita 20mW



Časté otázky k laserům


www.laserforum.cz

Profi měření výkonu a energie laserů

www.netlas.eu/slu-by/laser/meranie-v-konu



























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