Re: Torque Requirement
Read a mechanical design textbook & use the contents of it to find what you're looking for. Your question is quite vague. You say load, shaft geometries and speed are known. By whom? ■
Re: Torque Requirement
Originally Posted by louispanjang
Vague, I abandoned trying to make any sense of it at all 
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Torque Req
Hai,
Sorry my english and way of asking might be vague to all.Thank u for patience
Herewith i have attached layout might be clear to all...
I need to find torque to drive the shaft .....
Thanks
Prakash
Attachments
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Re: Torque Requirement
Unless I have miss understood, take a look here:
http://www.roymech.co.uk/UsefulTabl...ooffrict.htm
and here:
http://en.wikipedia.org/wiki/Torque
In summary:
F=uN
Refer first link for various u's (who really knows what they are based on though).
and
T=Fr
If you want the answer in torque, I believe you will need radii of some description (which I cannot see in the information currently supplied). Based on the information I have seen to date, you may (use some assumptions) be able to find a result, though express your answer in units of Force only (or maybe per unit of radius).
Though considering the earlier dialogue, I assume there is more to this than is forthcoming / my current understanding.
Regards,
Lyle ■
Torque Calculation
Dear Friend,
This is basic calculation, Refer any mechanical engineering design book. sizeThis is the way to lerning?
Calculate reaction forces (R) , and Bending Moment
Calculate stresses?
Calculate maximum bending moment ?
Select Shaft siz e ..etc,
Any way this is more to your objectives
Thanks
Uditha Kohowala
manager Engineering
Loadstar pvt ltd
118 , Minuwangoda rd
Ekala
Ja ela ■
Re: Torque Requirement
Originally Posted by Lyle Brownhttp://www.roymech.co.uk/UsefulTabl...ooffrict.htm
and here:
http://en.wikipedia.org/wiki/Torque
In summary:
F=uN
Refer first link for various u's (who really knows what they are based on though).
and
T=Fr
If you want the answer in torque, I believe you will need radii of some description (which I cannot see in the information currently supplied). Based on the information I have seen to date, you may (use some assumptions) be able to find a result, though express your answer in units of Force only (or maybe per unit of radius).
Though considering the earlier dialogue, I assume there is more to this than is forthcoming / my current understanding.
Regards,
Lyle
Dear sir
Your sense merely underlines what i had to panacea of this quiry. but as highlighted by you for radius which has not been mentioned in this thread . Can you be specific for which portion you are asking for radius. Is it bearing radius. Moreover his quiry also needs to take load into account as he has mentioned in drg. Based on that lets condensed out the inout data ie
Shaft radius 100mm
Bearing 150mm
Load as given in drg
speed can be assume
based on tjis additionality and given parameter by this author can we ascertain the value of torque and motor power required. Here accentuation is to be given to load acting on shaft as per drg
Awaiting for your valuable reply.........
Regards
Rahul ■
Torque Req
Dearsirs
Thanks to all for the reply.
To find the torque to rotate the shaft as shown,i am calculating the reaction force as for Ist step to the both ends.
From this reaction force N multiply bearing radius i will find the torque
Here is my doubt, frictional resistance will act on shaft outer surface,Can i use this force and mulitply with bearing radius to find torque?or else to add both...
Which force to multiply to find torque ?
Thanks
prakash ■
Re: Torque Requirement
Dear prakash
Can you send me your calculation process for torque required to rotate the shaft.
I will plea to get a reply from you. I have bid doubt as there is some diversified concept and trying to link it up with your approach
You can send me the same on my below mail ID
chaubey.07@gmail.com
rahul ■
Torque Requirement
Dear all,
I need clarification regarding torque requirement in the following arrangement.
Imagine a shaft 25mm diameter 600mm length simply supported and one end
gear is attached to drive the shaft.
Load is externally applied via lever arm and different material(polymer) same
diameter is in contact.
My querey is what is the torque required to drive this shaft arrangement.
Load,shaft geometries,speed are the known values.
My approach is assumed that at static condition load is applied over shaft, finding
the reaction force at each bearing end and from this force multiplied by bearing
mean radius with co efficient of friction of bearing which is normally(0.0025max).
Is the approach is correct?
1)My suspect is when applying force to the bearing, friction coefficient will
increase how to change of friction is accommodated?
2)Rollers in contact with pressure to overcome frictional resistance will be less
only i.e. shaft in contact assume that 100 N is acting,to overcome this force we
will multiply with friction coefficient of two materials say 0.3 and the calculation is
100 x 0.30=30N is enough to overcome the force of 100 N
3)To find reaction force at the ends can i use of 30N instead of 100N?
4)Suppose reaction force will changes in each end,say one end is 50 N and
another end is 35N can i take highier value?
5)Above is that running torque what will the empirically starting torque to select induction motor or servo drive motor specification.can i take say 1.5 times
running torque for both? Can i use T=IxAlpha approach?
6)In this gear is going to drive the shaft gear PCD has any influences?bcoz gear
radius is used to drive the shaft torque?
Thanks
Prakash ■