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05-03-2020, 07:20 AM | #1 |
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Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
Just a little quickie for Sunday. Axle stands. Here's my view on 3 legged ones. As with any safety critical item always use your best judgement and keep within the design limitations.
https://youtu.be/X78otmSeOZk Mart. |
05-03-2020, 09:34 AM | #2 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
Informative. Thanks for posting. I've got a pair from a loooong time ago.
Paul in CT |
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05-03-2020, 10:08 AM | #3 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
Interesting and makes sense if not elevated. The pin that is used to locate height also regulates the orientation of the seat. If the orientation is the same then it's OK.
Speaking of the height locating pins, a number of years ago, locally, there was an account in the paper of someone who was pinned an killed under a car when one of the stands collapsed due to the use of an engine valve instead of the (lost) dedicated pin.
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05-03-2020, 10:47 AM | #4 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
51 Merc: I think that's why Henry Ford used bolts that would bend before they reached their breaking point. No snapping of brittle hardened materials like valves.
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05-03-2020, 10:49 AM | #5 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
Bottom line.
AVOID USING THREE LEGGED ANYTHING THAT IS SUPPORTING SOMETHING YOU'LL BE CRAWLING UNDER. |
05-03-2020, 02:47 PM | #6 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
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05-03-2020, 02:54 PM | #7 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
I've always used ones I made out of V8 axle housings
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05-03-2020, 03:21 PM | #8 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
^^ yeah, I've got a couple of those too..
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05-03-2020, 03:27 PM | #9 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
3 legged stands are more stable than 4 legged ones.
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05-03-2020, 04:11 PM | #10 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
Sure they are
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05-03-2020, 04:32 PM | #11 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
What ever happened to "Right as a trivet"?
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05-03-2020, 04:49 PM | #12 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
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05-03-2020, 05:41 PM | #13 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
That looks like a rusty piece of crap to me. I wouldn't use it if it had 5 legs.
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05-03-2020, 07:36 PM | #14 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
On that stand the number of legs had nothing to do with it bending in the middle. three legs will never be rocky rocky like four will. The width of stance in relation to the height and the overall strength are most important.
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05-03-2020, 09:49 PM | #15 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
Mart is correct. He attempts to counteract the applied forces. With a degree in architecture and an emphasis on static structures, (no not static electricity buth rather static as in something that doesn't move or you don't want to move) I hope to explain this with quickee sketches. An applied force will always travel directly towards the center of the earth. If it meets resistance it will split the applied load and try and travel directly towards the center of the earth at a 45 degree angle, no matter the resisting forces angle. A very important thing to be concerned with is what's called a hinge point. That is a point where the load meets an unsecured connection with resistance. Hinge points can be overcome, but unsecured hinge points are dangerous. What Mart is showing is to try and counteract a tripod with 2 hinge points by turning them to counteract the applied force(s). As we all know getting a load off center will cause something to topple. (ever get drunk and fall down?). Same physics apply. Each time a load is split the resultant force gets divided by the number of points of resistance. Each load point resists weight by how far the load is off center and its resistance. The tripod shown is a result of an overload where the compressive strength of the steel was overcome by a load. Tripods are not nearly as stable as 4 points of contact. Tripods are commonly used as orchard ladders. Why, because they rest on uneven ground, where 4 points of contact like flat ground. The other force to consider though less likely to occur in this application is a lateral force, e.g. wind or someone leaning on the car while it's off center
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05-03-2020, 11:05 PM | #16 | |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
Quote:
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05-03-2020, 11:23 PM | #17 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
Concrete blocks aren't too safe!
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05-03-2020, 11:43 PM | #18 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
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05-04-2020, 02:13 AM | #19 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
On uneven ground, yes.
4 legged ones rock all the time.
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<Link> This is how we roll<Link> "I'm Convinced that no one really reads posts anymore; they just fabricate what they think the post says then ramble on about red herrings."--Bob Outcasts rules of old cars #1 Fun is imperative, mainstream is overrated #2 If they think it is impossible, prove them wrong #3 If the science says it impossible you are not being creative enough. #4 No shame in recreating something you never had #5 If it were not for the law & physics you would be unstoppable |
05-04-2020, 03:26 AM | #20 |
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Re: Sunday Morning Quickie: Tool Time. Lets talk 3 leg axle stands.
From reading all the comments it seems to me that the design of the stand is not as important as:
The evenness of the ground. The levelness of the ground. The firmness of the ground. The actual quality and condition of the device. The height to base footprint ratio. The side loads exerted while working. When working we all have to weigh up the risks involved. Just understanding that there is risk involved is the first step. How to handle and take steps to mitigate that risk is the next. I wasn't trying to start a controversy. I just wanted to point out some salient points regarding the arrangement. I respect peoples views and the fact that people mitigate the risk in their own way. Mart. |
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