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Hello, I am looking to fabricate a lift device for use in cold weather (down to -45C). Aluminum 6061-T6 appears to be acceptable from the information I have, -45 will only make aluminum stronger (do not need to worry about brittleness like with steel). Anyone have any knowledge of Aluminum...

Does anyone know what standard tow bars need to be designed to? I am having trouble finding this. Thank you

Would you use a ratchet strap for lifting? Incorporated into a lift device?

Hello, Does anyone know the drag force calculation and drag coefficient of a hollow rectangular shape? Thankshttps://files.engineering.com/getfile.aspx?folder=a8fd8920-e423-4ce9-b424-efc1ec89f51c&file=Drag.pdf

What design safety factor do you use for equipment holding a load where people will be working underneath? Thank you, A.M.

Hello, I am designing a tie rod for a wall mounted jib crane. I have attached a Spanco drawing of a similar design. My question is: do I need to make room for a wrench for the nut that sits between the tie rod clevis plates? Or is it just hand tightened during the adjustments during install...

BTH-1 states that there must be two bolts per bolted connection (3-3.2 Bolted Connections). However, crosby sells swivel hoist rings and other lift tools that are only one bolt for the connection. Can anyone explain the difference here? Thanks.

For "3-2.4 Combined Axial and Bending Streses" in BTH-1-2008: I am being told that when fa/Fa>0.15, I can still just use equation (3-31) instead of (3-29)/(3-30), that (3-29)/(3-30) are optional. The way I read it is that you can only use (3-31) if fa/Fa<0.15. Does anyone have experience with...

Does anyone know how to design for the bearing stress of a steel wheel on concrete? I found this article online: http://www.burnsmcd.com/insightsnews/insights/tech-briefs/2011-issue-1/contact-mechanics But according to this article, a 6" diameter x 3" wheel can only carry about 140 lb on...