#mechanical advantage

[bytetrending]

Robotic Arm Strength: Testing & Analysis

Breaking the Hydraulic Barrier For nearly a decade, the Fanuc M-2000i/A2300 held the title of strongest robotic arm, boasting an impressive bench press of 5,070 lbs (2,300 kg). This hydraulic powerhouse dominated the field. However, Rise Robotics has taken a dramatically different approach – eschewing hydraulics entirely in favor of a robust belt-and-pulley system. This decision wasn’t simply…

Robotic Arm Strength: Testing & Analysis

[stumblngrumbl]

i have about an acre of severely overground land - so thickly grown over that you literally can't walk through it, and before the main fence went around it even the deer didn't walk through it but went around it. it's like a jungle with vines (blackberry & poison oak), a few types of brush and a few different species of trees. it needs to be cleared - or at least majorly thinned - because as it is it's a huge fire danger during the very dry summer we get here.

i've tried just cutting the trees that i could reach, and that works great for pines - cut it and done. oaks however sprout zillions of shoots from the stump if you cut them (you have just coppiced the tree). that's fine if you're just trying to reduce height but it's actually counter to the goal of reducing fire danger as the shoots are even more vulnerable to fire than before.

unfortunately, pulling the trees which is the alternative has always been very difficult; i've tried pushing them over with the tractor but they usually just break, and pulling them out with the tractor works if they're small but once they're more than two inches thick they tend to hold on too well, and you really need to pull up and the tractor can only do so much of that. the ground here most of the time is super hard - only when it's been raining a fair amount does stuff soften up.

so last year i decided to make something to help in pulling trees - called it the "A-frame" for soon-to-be obvious reason. it worked pretty well if the soil was moist as the ground is looser then, but i was severely traction-limited and really not able to pull much more out as the tractor tires slipped in the moist soil.

well a couple months ago i picked up a winch for the truck, and i figured i'd give the A-frame a try with the winch - not that the winch can actually pull harder than the tractor, but i can actually anchor the truck to a big tree and then use the winch to pull without losing traction - the tractor pulls by moving so it can't actually be anchored.

so today was the day to try the A-frame:

the experiment was a success -- i had tried to pull this post out with the tractor, and it just wasn't budging. i could've broken it off at the bottom*, but it definitely wasn't coming out of the ground especially with that huge clod of concrete at the bottom.

so what's the idea here, how's it work?

it's called "mechanical advantage"; basically the idea is to use something that essentially multiplies your pulling force. think of levers - given a long enough lever, and a fulcrum, and you can move the world (so said Archimedes); pulleys also work by multiplying pulling forces.

how this mechanism works is that when you tip the A-frame, the line pulling it shortens a lot more than the line from the A-frame to the post - in fact, for every inch the post gets pulled up, the main line going to the truck gets pulled almost six inches; this means that there's almost a 6:1 mechanical advantage, and one pound of effort on the winch line results in six pounds at the post:

(there's some minor trig involved in getting the decimal numbers)

(the mechanical advantage varies as the angles change - the advantage is highest right at the beginning and as the A-frame tips it reduces; the advantage also varies with how close the A-frame is to the post and how far it is to the winch.)

of course the primary thing for my purpose is that the truck can be stationary while pulling (as it's powering the winch); more to the point it can be anchored. in this demonstration case with the fence post, it wasn't actually anchored and during the pull it actually got pulled slightly towards the post, but i could've anchored it if needed.

after the test, i decided to go to my jungle space and clear some minor brush so that i could actually access a tree to try the A-frame on.

as it happens, the soil conditions were perfect today, and before i knew it i had pushed over an oak tree by accident as i was pushing through some brush - usually they stop the tractor! it had been pushed with ridiculously little effort and in all i made a HUGE mess in just ten minutes which will take me a week to make into piles that can be set aside to chip or dry for burning ... so tomorrow i'll probably try the A-frame on a much larger tree than i'd ever expected to pull.

[*: i hadn't realized just how much concrete was at the bottom of that post and so i'm probably going to cut the post off above the concrete and then shove the rest of it back into the ground; it's right next to a drive going to the barn so it won't be a long-term problem having concrete in the ground there]

[auressea]

wow!

Elijah Ulysses Secrest on Instagram: "I added the claws to some old leather gloves, makes ‘em more comfortable and way easier to put on and

28K Likes, 259 Comments - Elijah Ulysses Secrest (@aerarius_metalworks) on Instagram: "I added the claws to some old leather gloves, makes ‘

[teddyworrell]

Rock Exotica began in a garage 28 years ago. Much has changed since those days of manual production and graph paper designs. However, one thing has stayed the same: Our desire to produce the most innovative technical equipment available.

[zestychille]

I have finally begun my next project. It will be a manually operated pulley device for short range towing, lifting, and otherwise moving construction supplies, debris, vehicles, what have you. This is the basic rough draft.

I typed up a lot about it to friends and family asking for materials sourcing. I am on a LOW LOW LOW LOW budget trying to source parts for it. But I’ll figure it out in time. Quote from personal post below the break

“Poorly drawn draft of what I'm working on. Sourcing parts would be helpful... I am looking to build at low cost. But I know there are certain parts that require safety and weight ratings that can not be skipped or cheaped out on.Does anyone know where to get cheap rigging supplies? I could use something along the lines of a hand winch, docking cleats, snatch blocks or similar pully rigging, and some great ropes. I could also use a system for hooking it to both the front and back of a motor vehicle, specifically a system that does not sit on the vehicle permanently, but can be removed similar to a trailer hitch/etc. Mounting the device can not require electric tools, as it is designed to be a manual pulley system to lift, tow, move supplies, etc.

The load can no exceed the weight of the vehicle unless an anchor is used, in which case I will need a three object mounting system, one part on the car, one part on the rigging, and one point on any additional counterweight used on-site.(counterweight is important in not damaging the vehicle, AND it allows for the system to be removed from the vehicle in order to use it in locations the vehicle can not reach.The supply weight for the specific items I have been looking at is carry-able over short-mid range. And the mechanical advantage for the system would enable the use of much less expensive supplies.

Figuring the rope and block diameter would be an important facet of the idea that I have not yet explored in depth.

Sourcing for parts and materials is the road block I am currently at, as I need to find the least cost without using items that are excessively dangerous. (I understand there is an element of danger in any rigging scenario, which is why paying attention to construction and safety are important in the process)

The mounting systems need to be able to bear the full weight of the system, but the pieces in the system obviously gain the mechanical advantage for that system.”

A short summary of my life’s work: Think of me as your local Trash Goblin, or like a Skaven if you will. Designing horrible machines, making terrible noises, eating trash, etc... Everything I make is done a weird way for fun because I can. I did it my way.

@zestychille

[s3mag]

Mechanical Advantage brings the meat

Mechanical Advantage brings the meat

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[predictoreports]

Access Full Report:- https://www.predictoreports.com/reports_details?Asia-Pacific-Manual-Torque-Multipliers-Market-Analysis-2012-2017...

Manual Torque Multipliers is a tool used to provide a mechanical advantage in applying torque to turn bolts, nuts or other items designed to be actuated by application of torque, such as the actuation of valves, particularly where there are relatively high torque requirements. Torque multipliers can also be used to ease manual tube expansion in drums of water tube boilers or to expand tubes in restricted space. The manually operated torque multipliers made are ideal for applications without a third-party power source – an effective tool for loosening and tightening bolts that is suitable for use anywhere and at any time. The Asia-Pacific Manual Torque Multipliers market will reach xxx Million USD in 2018 and CAGR xx% 2018-2023. The report begins from overview of Industry Chain structure, and describes industry environment, then analyses market size and forecast of Manual Torque Multipliers by product, region and application, in addition, this report introduces market competition situation among the vendors and company profile, besides, market price analysis and value chain features are covered in this report.

[mountainjourney]

Outdoor Research Presents How To Haul A Climber Out Of A Crevasse

Outdoor Research Presents How To Haul A Climber Out Of A Crevasse

Every mountaineer needs to learn crevasse rescue skills before they travel in glaciated terrain. Use this video from Outdoor Research to learn a few tips and tricks that can help you rescue your backcountry partner from a deep, cold hole.

Learn How To Haul A Climber Out Of A Crevasse

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Official Description From YouTube:

AMGA instructor Jeff Ward explains how to…

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