Mattymecc
Guest
Hello I am looking on the net to buy niemann 1 and 2, only that I do not find them, you know where you can find, possibly also pdf? Thank you.
standards of reference wheels dentate
- Thread starter Mattymecc
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- ingranaggi ruote dentate
volaff
Guest
the niemann consists of 3 volumes cmq.
Mattymecc
Guest
the third I found online in pdf
Mattymecc
Guest
I was looking at the profile shift this morning, and I had a doubt: the tooth always has the same height and moves the primitive circumference, going to change addendum and dedendum, or happens other. However, the formulas are quite clear on the khk manual apart from the inv function, which I did not understand well what it is...
IronMike87
Guest
In the method of changing the pressure angle, the tooth thickness is increased by increasing the pressure angle and resulting in a decrease in the radial stresses of the tooth, but thus reducing the contact ratio and the thickness of the tooth tip. This type of change requires playforce the creation of dedicated tools, made to measure, for the creation of a non-standard profile.
same for teeth where the depth or thickness of the tooth is changed
the most commonly used editing method is theaddendum modification, which is usually shown in table or as x o come x*m . the most important advantage of this method is that the production of modified gears can be made using standard tools.
if it may interest, below you find attached 2 images detailing the various types of error that can be generated in the processing of gears, and their impact on the final operation.
the measurement of all these characteristics is necessarily on machines cmm (coordinate measuring machine ).
take into account that certain rules (e.g. din 5480) allow the certification of the characteristics of the teeth simply with a pass/do not pass pad (of course made ad hoc by a third body according to the nominal characteristics of the teeth).
Mattymecc
Guest
First of all, thank you for the answer, but I did not understand what the pressure angle has to do with moving the profile, which I have not yet clearly defined in what it is, would you be able to explain to me what is "setting"? Thanks also for the images on the errors of processing the gears
IronMike87
Guest
we say that it is not just a walk to explain correctly how the xMaybe graphically it is easier:
Mattymecc
Guest
thank you for the link now I will try to read it, then I let you know doubts or other.. .
PIETRO2002
Guest
a toothing with correction can be obtained using standard makers or knives. special tools are used for example if you want to have a bevel on the top of your teeth. there are also tools topping or semitopping that besides, working the sides of the teeth, also work the outer diameter, in order to have perfect concentricity between the teeth and the outer diameter, when they serve, for example, from reference to the hole grinding.
volaff
Guest
I still have the pdf of the niemann.
do not spend money uselessly if you are a student and your economic situation is precarious.
If you can, better so...
do not spend money uselessly if you are a student and your economic situation is precarious.
If you can, better so...
Mattymecc
Guest
Can you send them to me? In fact money to throw I did not have, however I also had difficulty finding them, I heard a couple of people I know and also they said it is difficult, but on the net I found the third volume. . .
meccanicamg
Guest
with regard to the involut is simply a mathematical formula so realized:
♪[ inv(\alpha_N)=tan(\alpha_N)-\alpha_N \]where the tangent of the corner takes away the value of the corner... clearly everything in radiant.
Mattymecc
Guest
Thanks, in the end it's a simple thing, sometimes I lose myself in a glass of water...
Mattymecc
Guest
hello to all, yesterday I looked at some formulas for "normal" teeth and with profile shift, in doing so I made the list of these formulas and I tried to translate the terms in Italian, I would ask you if what I understood is correct (in the attached sheet I wrote a few things that I am unclear)... thank you for patience
meccanicamg
Guest
pressure angle 20°. real operating angle 26°.
idem primitive diameter....that d is the nominal but that of operation is the one modified by the action of the profile shift.
That's right.
idem primitive diameter....that d is the nominal but that of operation is the one modified by the action of the profile shift.
That's right.
Mattymecc
Guest
Thank you, tomorrow I will deepen those helicals. . .
PIETRO2002
Guest
very good for your commitment and approach! That's how you learn! !
Mattymecc
Guest
thank you for what you said, for me learning means first of all understanding, and I am convinced that these things tomorrow, in the working field, will be useful to me...
Mattymecc
Guest
hello to all, this morning I looked at the wheels of helical teeth, I think I understood most things, I would like to ask you, as yesterday, if I understood these things correctly. another curiosity concerns the forces acting on the teeth in the grip: on the khk manual I have seen that there are no special formulas for the determination of such forces (axial, radial, tangential), for gears with displacement of the profile, from that I deduce that you should use the formulas for normal gears, even if they contain the primitive diameter and the angle of reference pressure and not the operating ones.... is this my doubt....
PIETRO2002
Guest
I took a look at it, it seems you played right.
normal sistem is the system we use, the Anglo-Saxons use the diametral pitch, try to take a look at the manuals so that you see the relationship between the two methods.
helical hand is the sense of the propeller, r right = right, l left = left.