About this project
Lacing Tool UNLOCKED(See Update #6)
The Lacing tool will be cut out of 304SS sheet. Add $5 to your pledge if you would like one.
User guide UNLOCKED.
The User Guide will be free for all rewards and filled with rigging diagrams and scenario examples for each pulley and system.
Free TPS2 or 2 Replacement Parts Kits UNLOCKED
Your choice of a free TPS2 or (2) Replacement Parts Kits (A Kit will contain 1 Pin, 1 Sheave and 1 Retaining ring).
This applies to Reward Tiers:
Titanium Version TPS5-5,
Titanium and Stainless Versions One of each and Two of Each
45K Stainless Shackle UNLOCKED (See Update #9)
The Stainless Steel shackle can replace any one of you pins. This makes it easier to attach to all kinds of things. One of the cool things about this shackle is that the sheave will still function as normal. The shackle is made from 316 Stainless and has a rated load of 750lbs, it has a opening of 1/2" and a pin diameter of 1/4". If you would like this included with your reward please add $5 for each one.
If you would like to add replacement parts to your pledge. Add $5 for each set of replacement parts you want. (A set will contain 1 Pin, 1 Sheave and 1 Retaining ring)
Para TPS (Titanium Pulley System) What is it?
It's a Universal Pulley System made from Grade 5 Titanium used for making work easier and more fun no matter what you're doing. Designed for Paracord, or your favorite other 4mm line.
OK, So what would I use it for?
Anything you need to move or lift. Let's say you're mountain biking and a log or large rock has fallen in the trail. Luckily, you have these pulleys with you and can use them to move the object out of the way without breaking your back.
Combine these little workhorses to get stuff done. The small TPS2 could be used to keep your food out of reach of bears and other critters in a reduced friction bear bag system. This helps to save wear and tear on your line and the tree.
If you want to send some gear across a creek or river, each pulley was designed so it could be used as a zip line shuttle. You could even make a dog run for Fido while camping.
If you're a hunter and need to lift or pull your deer you could use the TPS4-4 or TPS5-5 to create a 5:1 mechanical advantage.
They are made from Titanium, Acetal and Stainless. They work great in a harsh environment such as say, the ocean. They could be used on a fishing boat or as a sailing block. These are just a few examples of the almost endless possibilities.
For me, any reason to play with them and see what they can do. My dad even uses the Para TPS to lift the front of his riding lawn mower so he can clean the underside.
Design and Materials
These little guys went through a whole bunch of revisions before they became the super awesome pulley you see today. I did most of my design changes in a 3D CAD system first until I got one that was close to what was in my head. Then I started making plastic printed prototypes.
I know some of you might be thinking that the pockets in the prototype side plates look pretty cool, and they do! But once I started doing my Finite Element Analysis (FEA) to calculate the stress and strength of the system, I had to take them out. I was looking for a factor of safety (FOS) of 3. In other words 3 times stronger than the load that would be on the pulley during normal use.
Based on using paracord with a breaking strength between 650lbs.-750lbs., a FOS of 3 puts the maximum breaking strength (MBS) of the pulleys around 2250lbs. These numbers have only been tested on a computer using the FEA. This is part of why I need support from you as a backer. Once this campaign successfully ends, I will take a full set of pulleys and run them through load testing. Load testing will basically involve ripping these little pulleys apart, and we're going to catch it all on video so you can watch. These tests are important to make sure that they are strong enough and safe enough to handle whatever you can throw at them. The final product will be laser engraved with its MBS and also a logo. The logo will serve as an Identifier so you can trust that you're getting an authentic and tested product.
Once I was happy with the design I sent the side plates off to be water jetted and fired up my lathe to make the sheaves and pins.
I spent a lot of time to determine the design and materials I wanted to use. The Side Plates and Pins are made of Grade 5 Titanium (Ti-6Al-4V) because of their strength and corrosion resistance. The Sheaves are made of (Homopolymer) Acetal (A very strong plastic that is used for bearings because of its low friction). The Retaining rings are made of stainless (304SS made by Smalley).
The Stainless Version will be made from 304SS for the Side Plates and Pins. The Sheave & Retaining Rings with be the same as the Titanium Version. The Stainless Version will be heavier and not quite as strong as the Titanium Version, but are more budged friendly.
By using retaining rings, the side profile of the pulleys stay small. The pins do not stick out from the side plate as much as a nut or head of a bolt. This means they are less likely to snag on branches. Each pulley can still be serviced if needed using common tools.
I chose these materials because of the strength and corrosion resistance of titanium and stainless and the machining and bearing properties of Acetal.
The final product will be slightly different than what is pictured here on this page. The overall design will stay the same, but some of the details such as the groove depth, pin length and distance between the sheaves may change. These will only be small fine tuning changes. This is in an effort to bring you the very best end product possible. If you have any suggestions, please feel free to use the comments section.
Let's look at the Rewards!
All rewards are the Grade 5 Titanium Version unless they say "Stainless Version of" at the beginning.
What Root Designs will use the money for?
First and foremost, your money will go directly to fulfilling your reward. Next will be load testing of each pulley to ensure they are safe for heavy loads, and finally, It will enable us to develop better projects in the future, potentially adding a piece of equipment here and there, expanding our capabilities to enable us to create even cooler stuff.
This project was successful. Now what?
All rewards will immediately begin production when funds are received after this project ends. The Individual pieces for the Para TPS will be sent off to different manufacturers for the production run. Other components such as the paracord, retaining rings and packaging will be ordered. Once all pieces and components are received, we will start assembling, packaging and shipping. Depending on how many rewards there are, the time it will take to complete will vary, we will make every effort to stay on schedule and get your reward in your hands.
A Little Project Background.
Shortly after completing the RD9 campaign, one of our backers (Matthew Peck) came to me with a project idea for a pulley system designed for Paracord. He has helped me from the design phase, through testing and creating this page. I want to thank him for all his help and effort in bringing this project to you.
Disclaimer, Be Safe.
Whatever line you choose, please take into consideration how strong your line is and how heavy the object you are pulling or lifting. Also remember that any knots that are in your line decrease the overall strength. Para TPS was not designed to lift humans or for overhead lifting. Have fun with them, just be safe while doing so.
Thank you all for your support!!
Risks and challenges
While unanticipated issues can always arise, we consider ourselves well experienced in product development. The products that we will ship out to you have been prototyped with the same methods and vendors we intend to use for production. This limits most of the unknowns that may show up in the final run.Learn about accountability on Kickstarter
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