Re: Anyone ever see a 3-point lift like this?

Posted by Billy NY on May 11, 2015 at 09:46:39 from (104.228.35.235):

In Reply to: Anyone ever see a 3-point lift like this? posted by Lanse on May 11, 2015 at 08:46:05:

Kind of like the boom on an engine hoist, I'll bet with your skills you could easily custom build one to your liking.

Consider how a crane operates, the lift line is the hypotenuse of the triangle. The further away the hook is from the center pin (vertex) the less weight it will carry. They have chart showing the proportion in degrees. Same principle. It would be wise to have your design looked at by an engineer to know what the steel member, configured as you like, will tolerate in loading, simple enough to figure out. Though some may just say use this or that for the boom, knowing its heavy enough from use and experience. For something like you want to build it is nice to know what the limitations are for safety reasons, and at what distance you can lift what amount of weight.

I used to bother our engineer with small things all the time, to find solutions to all kinds of problems on jobsites, it had to be proven to be safe even though I knew it would work. Some will balk at it, and I understand, so its really your call, but I'll bet what you build will easily suffice, its nothing real complicated.

An example as to why I think in those terms is this. One major project I worked on 30 stories up, structural steel retrofit of an existing building, I needed a landing platform to hang off the superstructure. I came up with a conceptual design and handed it off the engineer, with the specifications for our work only, and the loads we would put on it, but NOT anything else. Low and behold the carpentry contractor saw this as a great way to land their materials and load the building with metal framing and heavy drywall. We were using it for crates of metal and glass curtainwall. Drywall was much heavier and I never anticipated any other use than our own. When you build something like this, its wise to think ahead. It turned out to be built heavy enough to work. The engineer reviewed what the carpentry contractor wanted to do. They were told to stay off it until it was approved based on the engineers calculations and analysis and was submitted in writing, stamped and approved. Was not too costly either to know what you have and how you can use it.

That's just a thought process, does not mean one needs to take it that far for every little thing, but the philosophy is still applicable, just in a small way, as I see it, you are lifting heavy things, its a new or unique design.

Replies:

Add a Reply! You must be Logged In to Post Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Optional Video Title: Optional Video URL: Advanced Posting Options Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.   Advanced Posting Tools   Upload Photo  Select Gallery Photo  Attach Serial No List  Return to Post  Upload Photos/Videos Choose Files from your local computer Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]