Hello
Thanks
A safety factor of 8! That's alot. This Boom is not rated for people, just concrete. The critera in the states is to have 3 pads on the ground, it should still be stable with three pads. I have the standard. One pad starting to lift. The linked article shows this
Note that as the...
Hello
If you have a copy of Roarke this is also treated in section 8.5 and table 8.5. There is a example. I recall the figure being just like the one posted. Raorke can be downloaded for free but do not recall the website.
I must admit I would cheat and use the inventor Nastran. I am pretty...
Hello
You need to get all the curves from the MFG to answer some of the questions above. At low Torques or no torque it is less effcient. That would be the no load current, as I recall.
You shoud not go above the FLA at all if Sf=1.0. As itsmoked warns. If SF=1.15 and you have a continuous...
Hello TheRick109
Thanks for the response.
Did not think local codes would allow the use of Ultra high strengths steels above 70-80KSI yield in buildings, maybe Bridges but its not specifically called out in the AISC.
I stay under .6 x Fy, even .5 x Fy (for bending) as its Yield/TS ratio is so...
Hello Again
Note that most all Mack Trucks use 120KSI steel in the Truck Frames. Automakers use Ultra HSS quite a bit. Since this use is seen in eveyday use, like with buildings, you would think the Steel Manual would address a allowable stress for it. 80KSI ASTM A-656 is used in steel crane...
hello
If someone posts on a group and there is no response in a week or so, i would say its Ok to repost in a more specific group that my apply.
Unless there is no 'statue of limitations' on double posting.
Hello
Note that the arrow along the line indicates a press compensated proportional valve. That would mean at each setting it will maintain 'about" the same flow regradless of delta P. Note that putting a manual flow control downstream (say for stabalizing back pressure) of a press compensated...
Hello
Thanks again for the replys
I wonder how protected this info is. If someone recorded thier companies data and posted it on some website or even a book. Sounds like a good oportunity for someone like a PM, if they can do it. Lots of info on various estimating techniques, but hardly any...
Hello
Thanks for your reply
I am designing something similiar to a Telebelt that delivers concrete from the street to the jobsite off the road. See below. I believe they cost about 500K new. It is a different design unlike the existing but similiar in purpose as both deliver concrete with a...
Hello
Looking for a site or other data base with typical ENG hours used to develop various Mechanical prototypes, Machines, mobile equipment or Bridges or other. I am sure this data is often recorded. Is it available anywhere?
I found two sites that give data for car development. Anywhere from...
Hello
Thanks for all the well thought out replies. I Have watched or scanned the links suggested. The NASCC seems to be the most specific, offering code references that back up and load or resistance factors that may be used with data from the ASCE. Indicating any real codes are still mostly...
Hello
Thanks for the complete replies.
I am designing a double Telescopic conveyor that mounts on a Mack truck and extends out to about 98FT. Other companies have done similiar things, like Putzmietzer and Schwing Loop belt. You may be more familiar with the articulated pipe trucks that pump...
Been awhile since I used LRFD. A design "based on statistical analysis of probability of failure". Upon rereading I have several simple questions that I do not see readily in the searches. Pls respond if you know or have time. Thanks
1) It seems that this design should not be used for machines...
Hello
Not fully sure what the schematic looks like, but if you call the tech people at Sun they can tell what valve you may need. If you think you know what you want it to do. They have lots of press control valves.
https://www.sunhydraulics.com/models/cartridges/electro-proportional
The aproximate answer is to assume the shaft as fixed to the motor with torque applied at the coupling or other interface to the load.
Looks like the tapered CSK is where the pencil goes in. In this problem you will have a stress concentration at the key. As the key depth looks to be a large %...
Been awhile since I used LRFD. A design "based on statistical analysis of probability of failure". Upon rereading I have several simple questions that I do not see readily in the searches. Pls respond if you know or have time. Thanks
1) It seems that this design should not be used for machines...
Hello
Good points.
With a Hydrl motor once the max load is reached the hydrl motor will stall unless more pressure and flow is delivered. With a elec motor its stall torque is usually about 1.5 to 2 times its rated torque. So it can work in a pinch before the overload relays trip. So, you...
Hello PN. I sort of thought so, but threw that out there anyways.
One factor that may be revalent in chosing cylinder size is wether it is a push pull or pull only cylnders. For longer strokes with a push cylinder the rod must be a larger diameter and have a certain spacer inside to limit loads...
Hello
If you need a standard for the calculations, I have used references found in ABS standards as back up for calculations that need to be approved. For the end plates and other components. For any size cylinder. But these use alot larger safety factors then standard industrial customers...
Hello......... With out the full 2x Load and other tests you can not put the Momogram on the crane. i have worked with the testing bodies like ABS and DNV and it is not cheap.
THE API 2C MONOGRAM - YOUR ADDED PROTECTION
Manufacturers who want to apply the API monogram on their equipment and...
