Thanks, I've done some analysis, but not confident in my conclusion. We are mainly a contract fabrication shop and don't design our own products. This hasn't been tested in the shop. The mfg. manager suggested also to add some gusset plates at the mitred corners...
Thanks Desertfox. I don't like the lug connection either. More than likely the mitred corners is a groove weld and not a fillet weld. I am not familiar with using the strain energy methods to get deflection.
I'm going to try to clarify this again. I've uploaded a sketch of a lift device the shop wants to rate for use. It was mostly constructed of structrual tubing (round and square). 1.5 Sq with 0.125wall and 2"O.D. with 0.25" wall. The welds at B and C are 0.25 fillets welds. I don't the use of the...
A member of the shop had fabricated a lifting attachment from HSS tubing. If the part of the device are two sections mitered at 45 and welded together are these still considered two sections with the weld joint being a treated as a fixed support or one section in a FBD?
Customer drawing calls for minimum bend radius on 304 ASTM A666 stainless steel. ASTM specifications give a Bend Factor of 1 for Thicknesss>0.050 to <= 0.1874in. for Free Bending and Bend Factor of 3 for V-Block Bending. Is air bending regarded as "Free Bending"?
Compared the two formulae's again. If the bending stress were equal for both the simple supported and the fixed end, the simple supported beam would have half the load as the fixed end supported beam. But the deflection would be greater for the simple supported beam.
I've been reviewing tread ladder rung specifications and the companies are giving a safe allowable concentrated load calculated based on a simple beam calculation.
Wouldn't this over estimate the safe allowable load?
The flexible cable system has a pretension load requirement of 750 lbs. The load requirements are outlined by the manufacturer of the cable fall prevention equipment based on their own tests.
...Our completely different calculation?
One of the rungs appear to be 3/4" diameter rebar, 13.5" in length.
Stress at Center (supported), -(W*l)/(4*Z)
W=2,100 lbs.
l=13.5 inches
Z= (Pi*d^3)/32 assuming 3/4" diameter = 0.0413 in^3
Stress at Center = -(2,100*13.5)/(4*0.0413)= 171.6 KSI...
I'm constructing a small rotating tool stand and planning to use two sets of tapered roller bearings (Timken L44643 2 bearings. The average loading would be less than 500 lbs. The nominal shaft size is 1.0 inch diameter, and the housing is 1.98 inch diameter. The housing would be stationary and...
Does anyone have an calculation to estimate the tonnage required to form a joggle or offset bend in sheet metal? Most texts will give an estimate between 3 - 6x the tonnage for air bending?
RPM of drive wheel = 0.283 rpm * 50.5" / 10" =~ 1.5 rpm
HP=(2.557)*(1.5)/(5252)=0.0007303 HP (1/1369 HP ?)
Not much horse power required at minumum, but like dimjim mentioned, whats the resistance of the two idlers? The 10" diameter idlers had bearings and little torque resistance.
Thank you both for the information. I did pickup one of the available smart motion cheat sheets. Some of the information is unavailable for larger AC motor applications such as Load Inertia of the motor (at least in the catalogues I have in front of me).
I had recently fabricated a set of welding turning idlers for our weld shop using a set of 10 diameter wheels, 28 inches center to center. We are using it to turn 50" diameter tanks while welding. The tanks will be over 1500#, welding at a maximum of 45 ipm. I want to motorize the unit using a...
Yes, basically I am analyzing a single vertical beam and considering the fixity for simple beam calcultions. So would you consider the end condition as being pinned?
If you were designing a mobile gantry with the side structure being typically an A-frame, would both ends of the vertical column be considered as "fixed" end conditions.
The function of the driver is to install a bushing into the arm of steer knuckle at the proper depth with out distorting the bushing. It is not a one time tool, but daily usage.
I need to make a custom bushing driver. I am considering using ASTM 4140 material? Any other material I should be considering? Should it be hardened and too what degree?
Thanks for your help
Has anyone in the forums had any experience in press fitting drawn cup needle bearings? I would like some know how to calculate the force required to press fit a needle bearing into a bore?
