I am currently working on a project to evaluate existing lifting devices per BTH-1. One of the devices drawings (1954) lists the material as A284 Gr A. Does anyone know were I can find the tensile and yield strength?
This is for a trolley frame on an overhead crane. I am being asked to provide calculations showing a frame is capable of withstanding the resisting moment due to equipment such as gearboxes and brakes. I am having trouble figuring out how obtain the forces / moments to apply to the frame. Does...
Per OSHA 1910.23(e)(1)
A standard railing shall consist of top rail, intermediate rail, and posts, and shall have a vertical height of 42 inches nominal from upper surface of top rail to floor, platform, runway, or ramp level.
My question is has OSHA ever defined "nominal" for a range when...
I am trying to find out if there is a specification or information on the maximum gap under the crane rail and the girder for an overhead top running bridge crane?
I am currently working on a retrofurb of a crane and the customer wants an equalizer bar assembly and the only place to place it without losing hook height is over the upper nest and using the equalizer sheave to reroute the ropes as shown in the attached drawing. Now the purpose of the...
I am currently working on a project were I have a primary and secondary brake and the secondary brake needs to have a 1-3 second time delay after the 1st break sets. For this application we need to use two electromechanical brakes and the brakes selected use a solenoid. My thought was to place a...
I am currently working on a project where I have to make a foot walk on a crane OSHA compliant, to meet the 48" rule from low obstruction the deck has to be lowered below the girder (W24x100) and outrigger (W16x26) by about 4-5 inches. The beams are 47 inches apart centerline to centerline and...
On a current project I am trying to use L2x2x3/8 as posts for a guard rail on a crane based on our stress limits the post fails under the full 200lbs OSHA requirement. My question is does the NAAMM Nomogragh also apply to angles as post or is there another way of determining the load applied to...
