Lifting Jig

[BenGBW]

Trying to determine if a lifting jig used to lift a motor can support the load. The jig has a gusset plate welded on both sides. Struggling to find the resistance of the weld at B and if the weld and gusset can support the stress at C.

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1559843178/tips/SBP00904019060611270_aquwgj.pdf[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1559843300/tips/SBP00904019060610441_htvvei.pdf[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1559843522/tips/SBP00904019060611271_nxa1sb.pdf[/url]

 

[EngineerTex]

Why are you using a 5:1 SF for the appliance?

5:1 is for the wire rope of the crane that is continually being wrapped around the drum and sheaves and then straightened back out again - something almost fatigue-like. This appliance is not experiencing that, is it? Will this be a dynamic lift (static crane lifting from a heaving barge deck) or a suddenly-applied lift? If not, then a 5:1 SF for this part might be reconsidered.

Engineering is not the science behind building. It is the science behind not building.

 

[chicopee]

To E.T.:The factor of safety 5:1 is to take care of the stress concentration where the hole was made for the lifting eye bolt.

 

[chicopee]

I personally would use a channel instead of a flat plate in order to minimize deflection which has not been analyzed from the info. provided; also I would strengthen the hole with a double plate or weld two rib plate connecting the two side of the channel around the hole.

 

[MJCronin]

Use all square or rectangular tubes and flat plates next time.

There will be a bit more welding

This will give you a frame that is less "bouncy"

MJCronin
Sr. Process Engineer

 

[SnTMan]

400 lb? You can safely lift that with stuff from the hardware store...

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand