Recent content by jdkuhndog

oops ! There was a typo in the original post. T2 is directed back toward the lift beam which would be up and to the right. dvd - sorry i didn't notice the typo previously, not i understand why you wrote the equation that way. dersertfox - thanks, that deeper insight into the 2nd equation...

dvd, Lug 2 is to the left and above Lug 1 and T2 is directed up and to the right...the vertical component and the horizontal component of T2 both produce a cw moment about Lug 1. The CG is to the left of Lug 1 and W is directed down which produces a ccw moment about Lug 1...therefore the...

unclesyd, nice website...but not much help in my question. anyone? thanks, jdkuhndog

what website?

I have a Lifting Beam that has two vertical chains coming off of it and one horizontal chain coming off it as well. I have a load which i will be lifting and then tilting up a little bit with the horizontal chain. Let me layout with words where all the connections are. Lug 1 - this will be...

Thanks for the info NickE & metengr.

I know this is a pretty stupid question...but i couldn't find a definition on the internet or in any of my books...what exactly is meant by 'Hot-Wrought'? I want to use a material A576 Grade 1045 Hot Rolled for an 8" diameter round I need for a wheel. But in the selection guide i am using, it...

Thanks for the links guys...they proved useful. I will be posing this following question to some vendors...but, didn't know if anybody had some insight into it... What is the corrosive resistance difference between ASTM A564 Type 630 Condition H1150 versus ASTM A276 Grade 316 Condition A ...

Is A276 Type 316 Condition B a stainless steel that is produced/used much? I have called this out in a calculation and then come to find that our local stainless distributor does not stock it and has never heard of it being requested. Does anybody stock it? I was trying to avoid the more...

Here is a link to a summary of some testing done with CO2 blasting...is this what you are referring to? http://sti.srs.gov/fulltext/tr2003084/tr2003084.pdf page 11 has a good picture of the CO2 pellets.

nornrich, I believe the relationship is outside corner radius = 2xwall thickness. jdkuhndog

ccw, don't have much time to write...but concerning one of your first points about the Torsion due to friction being too high...this is how I arrived at the number...let me know if there is a better way. The nut is rotating on a bushing not on an anti-friction bearing. The coefficient of...

Thanks for the comments... I have made a phone call to a company which manufactures these lower blocks with a rotating hook. The chief engineer there told me that they really don't have a calc that they perform to ensure that the wires won't twist...they have had it only happen to them once...

The gearmotor for rotating the hook is located on the lower block. Let me try to be a little more clear on what is going on. I have a lower block with 4 sheaves - 8 parts of wire rope...right now I am considering the wire rope to have no effect on resisting the twisting effect. The lower...

Greetings. I have recently completed the calculations to determine the required Torque for a gearmotor to rotate a hook (and its 6000# load) on a lower hook block for a crane. My question is how do I determine if the lower block is going to rotate/spin instead of the load rotating? Here is...