Spline shaft design.
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- Опубликовано: 20 май 2019
- Spline shafts are widely used in the agricultural industry, trucking industry and where large torque requirements is a must. This is one of the many methods on how to do decent strength calculations for spline shafts. The Machinaries Handbook's method of spline shaft design is utilized.
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This video just saved my university project, thank you very much
Excellent Explanation.
beautiful! Thanks!
Thank you too much iam from egypt
Good job
Thank you very much ! You picked up an unique topic that's why quite less videos are available on U-tube related to the topic. I am glad to find this video!
Would like to understand, how did you formulate 1) the shear at spline root? 2) shear at pitch diameter?
Thank you sir for your time on this perfect tutorial. Could you please tell me what version of the Machinaries Handbook are you using? Mine is the 30th version and I couldn't find the exercise to check more details.
Regards
Plz make video on go no-go spline gauges design calculation
Could you please tell me what version of the Machinaries Handbook are you using?
How to design Internal and External splines if I know power, rpm, application is high shocks, diameter of shaft and hub?
So usefull video but there is no other type of strees that is compressive stress and tensile stress. And can you suggest Some book for spline shaft except for machinery hand book?
You can look at books like Mechanical Engineering Design by JE Shigley, C. R. Mischke and Machine Design (Schaum) by AS Hall, AR Hollowenko, HG Laughlin.
Spline compressive stress is known as the crushing stress on the spline sides. There is no need to calculate tensile stress.
The only two stresses needed for calculation are compressive and shear. Unless you want to solve the problem using Bending stress where there is a moment from the spline root to the Centre of the spline. This will yield both tensile and compressive stress results that will be equal.
This is why calculating crushing (compression) only is enough.
For Bending Stress = My/I, where I = (bd^3)/12; y = distance from spline root to spline centre; M (moment) = applied Force on spline Centre X distance from spline root to spline Centre.
Hope this helps.
Pleas make as gear design
Well done.
The only thing I still don't understand is what is module? How is that value measured or how is it determined ?
Thanks in advance.
Its basicly the pitch diameter devided by the number of gear teeth.
If you have two gears that need to mesh, you would use the same module for both, true for spline theory as well.
Module is a size ratio to match your mating gears or spline fit.
A larger module would allow for more design strength of the teeth if gears and splines.
Hope this gives some clarity. Sorry for answering so late.
it's a very interesting Example. may I know the reference book, please?
+1
How to find the spline profile belongs to which standard eg.DIN or ISO??
The profile is iso standards based. Check out this info link below.
roymech.org/Useful_Tables/Keyways/Splines_Inv.html
Which book was that?
Check the engineers handbook, if Im correct as I took it from notes that I had. Reference was made to the engineers handbook.
Does not matter which book you use, the primary modes of faliure is crushing and shearing, same as keys and keyways.
Then after calculation for both modes of faliure, use the lowest factor of safety by number which is actually the highest factor of safety allowed.
at calculation part of shearing at spline root value of root diameter cube is wrong 15:04
Hi Pratyush, thank you very much for your observation, much appreciated.
I left out the cube during substition, but the answer is correct as I calculated to include the cube value.
Which metal is best to make spline shaft
Splines in general is made out of steel. Dependant on the application, it also made out of stainless steel, even aluminum alloy.
If there is a lot of corrosive material where the power are being transmitted, it will be made out of stainles. In the end its all about cost effective strength for the specific application with condition of your customers desires.
Dear sir
The spline shaft is for cnc machine
Shaft diameter is 4 " soo sir will u please tell me which en grade of material should i use
Please tell me
What size of machine are you looking at, how much power are pushing through your spindle that has to do the cutting?
Usually in cnc machines you got 3 to 5 stepper motors and than the spindle.
These motors operate, one for moving the crossbeam forward, one for moving a vertical slider on the crossbeam, one for moving the spindle and slider combination horizontally and the last motor will rotate the work piece. A final motor can be used to rotate the crossbeam 90 degrees.
Normally you have belts and pullies, screw shafts and nuts, moving the above via linear bearings and or rollers.
Splines are for heavy torque applications. This is why I ask what is your spindle power requirement.
The stepper motors will do work based on production output needed.
Spline shaft does not sound like the right application for a cnc machine, unless its a huge thing you have in mind.
However if you just want to design a spline based on power requirements, it can be done with the method in the video.
You can machine the spline with the material calculated or you can select the spline shaft from a catalogue and buy it from the shelve.