Answered: Rope Questions

[JoseSantos]

I would like to know if the following rulings from last season regarding rope are still valid in VEX Gateway:

Answered: Braided Versus Twisted Nylon Rope

The VEX pulley kits come with 1/8" solid braided nylon rope. Is it legal to use 1/8" twisted (not braided) nylon rope? They both have similar properties in terms of strength and coefficients of friction, but I’ve found that twisted nylon rope is much easier to find in stores.

Yes, this is legal.

(https://vexforum.com/t/answered-braided-versus-twisted-nylon-rope/18793/1)

Answered: Can we fuse the ends of the 1/8th nylon rope?

Cut synthetic rope tends to fray because there is nothing to hold the strands together at the end of the rope. A common remedy for this problem is fusing (i.e. melting) the cut end of a synthetic rope to recombine the strands to prevent fraying. Is it legal to fuse the ends of the 1/8th inch nylon rope that is on a VEX robot?

Yes, this is a good practice and will be allowed. This is the only type of melting that will be allowed in VEX Round Up.

(https://vexforum.com/t/answered-can-we-fuse-the-ends-of-the-1-8th-nylon-rope/18143/1)

[FAQ] Can we use string on the robot

[FAQ] Can we use string on the robot

As per <R6a> of the VEX Round Up Game Manual

Thus, any string/rope used must be identical to what is included in the winch and pulley kit. The specifications can be found on the above linked page, and are also included here for your convenience.

• Nylon, solid braided rope
• 1/8" diameter
• Ultimate tensile strength 100 lbs.
• No longer than 4’ Note it may be difficult to find string/rope rated for 100 lbs. When we rated the rope we wanted to provide a safe rating for users, but the moral of the story is 100 lbs is more force than any VEX robot would exert without destroying other components. As a result, you shouldn’t worry too much about the tensile strength when you’re looking for “equivalent” rope. For our purposes, the rope is basically “infinitely strong.”

-John

(https://vexforum.com/t/faq-can-we-use-string-on-the-robot/18142/1)

Thanks in advance!

[Karthik]

I would like to know if the following rulings from last season regarding rope are still valid in VEX Gateway:

(https://vexforum.com/t/answered-braided-versus-twisted-nylon-rope/18793/1

)

(https://vexforum.com/t/answered-can-we-fuse-the-ends-of-the-1-8th-nylon-rope/18143/1)

([https://vexforum.com/t/faq-can-we-use-string-on-the-robot/18142/1)

Thanks in advance!](https://vexforum.com/t/faq-can-we-use-string-on-the-robot/18142/1))

Yes, all three are valid. Specifically, the second one is called out in the VEX Gateway Manual in <R15b>

<R15> Parts may NOT be modified as follows:
b. Welding, soldering, brazing, gluing, or attaching in any way that is not provided within the VEX Robotics Design System will NOT be allowed.
• Mechanical fasteners may be secured using Loctite or a similar thread-locking product.
o This may be used for securing hardware ONLY.
• Teams are permitted to fuse/melt the end of the 1/8” nylon rope to prevent fraying

[JoseSantos]

Yes, all three are valid. Specifically, the second one is called out in the VEX Gateway Manual in <R15b>

Thanks, Karthik!

[Karthik]

Thanks, Karthik!

You’re welcome!