How to model a rope winch in NX?
How to model a rope winch in NX?
(OP)
I'm not the expert in Nx what to model a rope winch, and how to animate the wining process?
I thought about a helix, how to do the second layer?
I thought about a helix, how to do the second layer?
sorry new in NX
regards
Erwin





RE: How to model a rope winch in NX?
RE: How to model a rope winch in NX?
Best Regards
Hudson
www.jamb.com.au
Nil Desperandum illegitimi non carborundum
RE: How to model a rope winch in NX?
If you want to model several layers, a relatively fair workaround should be to create multiple helix-es concentric , every other in different turn directions ( Right / Left) and finally connect the "layers" with bridge curves. see attached image.
Regards,
Tomas
RE: How to model a rope winch in NX?
This is in 8.5
NX 8.5.1.3
RE: How to model a rope winch in NX?
NX 8.5.1.3
RE: How to model a rope winch in NX?
NX 8.5.1.3
RE: How to model a rope winch in NX?
RE: How to model a rope winch in NX?
If you look at the cable on a winch you'll notice that the wire joggles across suddenly at a certain point.
If you wound it on along a helix in one direction, when you go the other way (on the next layer), it would never sit correctly on the layer underneath,
( I can't view your files as I've got NX8 not 8.5)......the groove needs to guide the wire in both directions equally.
(bear in mind after the first layer, the wire can only be influenced by the previous layer, not the groove underneath)
what it needs are RADIAL groove's spaced diameter distance apart, which only extend 180 degrees around the drum, then on the opposite side of the drum, they are offset by half a pitch.
then when the wire goes on, it follows the groove as far as it can before jumping over to the other groove, and so on....
then when you start the 2nd layer, it sits between the wires on the previous layer and only crosses over, across the step over sections, then it'll take on the joggle I spoke of.
If you look at a winch with many layers, you'll see it's no longer a cylindrical coil, but it's "crowned" at the joggled areas, because each layer adds less than a cable diameter, except over the joggle.
If you talk to someone who operates a winch for down hole logging or sampling etc, they'll tell you that the 1st layer on the winch is critical because any fault will get
worse and worse the bigger the reel gets.
These winches have a feeder arm arrangement which is geared to the drum to help the wire go where its supposed to.
RE: How to model a rope winch in NX?
And if there is increasing tension on the wire it will cut trough the existing layers.
- I ,lets say, "ignored" this when proposing the helix methods....
The reality seemed a bit too complex.
Regards,
Tomas
RE: How to model a rope winch in NX?
NX 8.5.2.3
RE: How to model a rope winch in NX?
Toost, I think boat winches would'nt have the feeder arm, so the wire can take its own path, so as you say, a caotic wind is acceptable, and as the weight is fairly low it's no problem.
With down hole logging etc, there are miles of wire, which weigh an awful lot, and if it's not perfect, it'll snap
RE: How to model a rope winch in NX?
and discussion is interesting, too.
I'm out out of office this week may, will look at the example when I'm back.
thanks
sorry new in NX
regards
Erwin