- #1
Hutch
- 3
- 0
Hi all, my first post here,
I've succumbed to some help if possible, i know its wrong but it's getting my goat! now, and many times in years gone by.
I am building something as always, and reverse engineering exisiting drive components to select suitable new ones if that makes sense. In particular I am looking at a screw helix mathemtically (trying). or should i say just a screw.
what i want know is the relationship between :
the torque applied at a radius of a screw,
and the linear resultant force.
taking into consideration of course the helix angle, or i think, the helix angle. as that has a relationship with the force output, through an angle.
for instance, a screw thread with diameter 8 and a lead (pitch) of 2.5 between threads. using the trig formula
inv tan = opp / ADJ
and modifying slightly to add 'pi' , as the helix angle is using one full circumfrence of the screw against one pitch. and we are not working in 2d anymore.
inv tan = ( opp / pi.ADJ )
gives a helix angle of 5.68 degrees, great, the helix angle.
now,
what i would like to know is how does that helix angle now affect the output force as a multiplier, forgiving friction, with regard to what is input (torque/any) through the handle
.
i can see it is a ratio, and it changes uniformly, it is a decimal number, a mutliplier, how is the geometrical ratio now expressed?, how much force is output through a helix angle, any!.
I've succumbed to some help if possible, i know its wrong but it's getting my goat! now, and many times in years gone by.
I am building something as always, and reverse engineering exisiting drive components to select suitable new ones if that makes sense. In particular I am looking at a screw helix mathemtically (trying). or should i say just a screw.
what i want know is the relationship between :
the torque applied at a radius of a screw,
and the linear resultant force.
taking into consideration of course the helix angle, or i think, the helix angle. as that has a relationship with the force output, through an angle.
for instance, a screw thread with diameter 8 and a lead (pitch) of 2.5 between threads. using the trig formula
inv tan = opp / ADJ
and modifying slightly to add 'pi' , as the helix angle is using one full circumfrence of the screw against one pitch. and we are not working in 2d anymore.
inv tan = ( opp / pi.ADJ )
gives a helix angle of 5.68 degrees, great, the helix angle.
now,
what i would like to know is how does that helix angle now affect the output force as a multiplier, forgiving friction, with regard to what is input (torque/any) through the handle
.
i can see it is a ratio, and it changes uniformly, it is a decimal number, a mutliplier, how is the geometrical ratio now expressed?, how much force is output through a helix angle, any!.