Talk:Cantilever

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misc 2005 discussions

The modal frequency or the first mode of frequency for a cantilever beam is given by the equation (B1l)^2(EI/rho.A.l^4)^1/2. Where B1l=1.875104 (which is the first mode frequency) —The preceding unsigned comment was added by 138.250.27.152 (talk) 15:11, August 22, 2007 (UTC)

Someone should add info here about the use of cantilevers in AFMs and such. If I ever get enough time and knowledge, I'll throw my two cents in. -cgw

What is an "AFM"? Leonard G. 03:01, 19 Mar 2005 (UTC)

Atomic_force_microscope --210.248.188.53 17:54, 23 June 2006 (UTC)[reply]

The definition needs to be expanded a little more... I'm reading it but still not "getting it". It reads like anything is a cantilever as long as it's anchored. -Timvasquez 03:34, 14 September 2005 (UTC)[reply]

Clarifying canteliver

I added an image in hopes of clarifying what a cantilever is for those who process things visually. Feel free to take the basic idea and spiff it up. Epolk 22:12, 12 October 2005 (UTC)[reply]

the picture looks like a rake

I updated the picture. - SCgatorFan 04:34, 15 July 2007 (UTC)[reply]

AFM cantilevers are quite the same as any other cantilever. Except they are operated in resonating mode (sometimes). This page belongs to architecture-relevant topics, and MEMS and AFM are only relevant to the sub-micron real estate. I think it might be best to skip all that. —Preceding unsigned comment added by 69.17.59.250 (talk) 20:48, 11 August 2008 (UTC)[reply]

IN MEMS

I think the In MEMS section of this page needs to be reviewed. I would dispute the claimed relation between resonant frequency and applied force. Largely because applied stress is force over an area, which means that in the spring constant equation force would seem to cancel with the stress that appears in the deflection equation, this makes sense because the spring constant should be... well constant. This would mean that the force does not appear in in the resonant frequency equation when the spring constant is substituted into the equation.

Looking on IEEExplore at articles on the subject, it would seem that measurements of resonant frequency and change in resonant frequency are usually used to determine a change in the overall mass of the cantilever arm, NOT in measuring change in applied force. These applications often involve detecting the other particles attaching to the cantilever arm and therefore changing its frequency. On the other hand, change in applied force detection is usually achieved by somehow measuring change in deflection, rather than a change in frequency.

I could be wrong in my understanding of all this, but I still think this section of the page needs some revision to clarify these points. —Preceding unsigned comment added by 132.181.52.93 (talk) 00:57, 5 October 2007 (UTC)[reply]

The given Stoney's formula seems to be not true. — Preceding unsigned comment added by 192.75.94.20 (talk) 14:30, 25 July 2012 (UTC)[reply]

Of what use is a MEMS descrip. in a page on cantilevers?

Most MEMS applications and devices are based on macro-scale physical laws. What is good for the gander (regular cantilevers) is good for the goose (MEMS devices)I would like to question why have a MEMS cantilever description in a page describing cantilevers. I equate it to describing a guitar string in a page on oscillating strings, i.e. a specific model which really is no different from the original model. The whole MEMS section should be briefly described in two lines about applications of cantilevers, since MEMS does not require any different description for cantilevers than in civil engineering. For more references on MEMS, the Bharat Bhushan-Handbook of MEMS and NEMS can be consulted.

WRT the above comment, I agree that clarification is needed, but the description mentioned seems accurate by itself. A point of contention I have is that the description of simple geometric nonlinearities as super-linearities is quite misleading. The second and third order terms usually arise from a simple Taylor's series expansion of the trignometric terms. They are again, merely approximations, and should not be described as being something inherent to the system itself. —Preceding unsigned comment added by 69.17.59.250 (talk) 20:40, 11 August 2008 (UTC)[reply]

I would agree, but do not know anything about MEMS to know where to move the information. - PennySpender1983 (talk) 03:25, 12 August 2008 (UTC)[reply]

Don't the equations in the MEMS section hold for cantilevers more generally? If not, what would the analogous equations be? Rick lightburn (talk) 02:19, 7 October 2008 (UTC)[reply]

The section explains something commonplace using using a very niche example no-one visiting the page will have heard of! There’s no explanation of a simple cantilever and the forces involved except the unclear diagram only helpful to structural engineers.11:16, 29 December 2021 (UTC)Oblomov99 (talk)

Copyright permission for text in new section called In warehouse storage applications

The creation of a section for cantilevers "In warehouse storage applications" included a statement and reference that text was copied from a website with permission. The procedure given at the guide for requesting copyright permission does not seem to have been followed. The copyright tag at the bottom of the page in question requires written permission and says the firm "strongly enforces its copyrighted materials."

Please refer to that Wikpedia guide for information on the proper way to request permission for text and for what to do when permission is confirmed.

Has permission been obtained in writing or by email?
Has the permission been submitted to Wikipedia?

If no response is given, I will probably tag the text in the next few days for copyright violation. - ¢Spender1983 (talk) 21:16, 5 September 2008 (UTC)[reply]

There are also sentences in this section that was added that read like an instruction manual (safety warnings, etc.). Please refer to WP:NOTGUIDE as this is not encyclopedic material. If not improved, it is likely to be deleted. - ¢Spender1983 (talk) 04:47, 8 September 2008 (UTC)[reply]

Sorry all - I am new at this. The text is from my website - sjf.com. I am the author and I hereby grant permission. If you have any questions about this material, please address them to me. I am sorry for any trouble I have caused, and if you're willing to help me - I am willing to learn. Sterner2 (talk) 12:52, 8 September 2008 (UTC)[reply]

You cannot grant copyright permission by simply making a post here. I gave the links above on how to grant permission and will repeat them here:

Consent should be in a specific and complete form, see WP:CONSENT.
How to submit to Wikipedia

I suggest you read that page thoroughly. - ¢Spender1983 (talk) 22:37, 8 September 2008 (UTC)[reply]

In warehouse storage applications

I moved the entire section here for discussion, reverting the section to it's previous state. Because the contributing editor has a conflict of interest with the site used as a reference, and because it is not a reliable source, we need to be sure that it is rewritten and sourced properly: --Ronz (talk) 17:51, 1 October 2008 (UTC)[reply]

Content moved for discussion

Cantilever Rack, also known as furniture or pipe rack is a type of storage rack for long, bulky materials such as lumber and PVC or metal pipes. Furniture rack is a style of cantilever racking that can be decked to provide static storage similar to pallet racking, with the advantage that it provides easier storage and retrieval of bulky or oddly sized material than traditional pallet rack. Cantilever rack is typically a very efficient means of storing material as there is easy and open access to all levels of storage.

Cantilever Rack Uprights
Like pallet rack, cantilever has specific components that work together to create larger bays and rows of storage. Uprights are the main structural components in any cantilever rack installation. Uprights work with bases (in this context, when referring to uprights it means complete upright/base combinations) to create the 'backbone' of the rack. Uprights are available in single, or double sided configurations - with the only difference between the two being that when using double sided uprights, material can be stored on both sides of the rack. Like pallet rack, there are many different makes and brands that do not all work together.

Cantilever Rack Arms
Similar to other types of rack beams, cantilever arms make up the actual 'levels' that are used for storage. The arms are typically adjustable on the upright to create shelf levels at the heights that are needed. Arms can be straight or inclined to hold goods that may roll off. Some arms come with a "lip" that attaches to the end of the arm to prevent loads from slipping off the front of the rack.

Cantilever Rack Sway Braces
Cantilever sway braces go between uprights and stabilize the rack laterally. Braces are not intended to hold loads and should only ever be used to connect and brace the uprights in a contiguous row. The braces will be the same length as the spacing between uprights.^[1]

References

^ This section contains text from SJF Material Handling (http://www.sjf.com/guides/warehouse-storage-rack.html) (Permission Granted September 2008)

Cantilever deflection equation

By looking at it, the equation in the MEMS section for cantilever deflection as a function of Young's Modulus, stress, and dimensions is confusing. What are the units of the deflection, and how does that relate to tip displacement? The displacement of the tip I guess should be units of length (meters or microns). However, the right hand side of the equation is unitless, since L/t units cancel, as do stress and Young's Modulus (both Pascals). 129.110.242.6 (talk) 22:23, 15 April 2009 (UTC)[reply]

A lot of that material could probably be removed on the basis of WP is not a textbook. ¢Spender1983 (talk) 22:45, 15 April 2009 (UTC)[reply]

.. —Preceding unsigned comment added by 203.177.74.138 (talk) 11:11, 4 November 2009 (UTC)[reply]

Aircraft

As far as I know or pretend to know... the Junkers J 1 example IS NOT a cantilever wing. The other photographe of the section, the Hurricane fighter plane IS a good example of cantilever wing. I'm I wrong? Kintaro (talk) 13:33, 2 October 2013 (UTC)[reply]

Unfortunately, yes. A cantilever wing merely mean that it is supported at one end, i.e., at the fuselage end, with no additional supporting structure such as struts or bracing wires. So the Junkers J 1 does have a cantilevered wing. — Preceding unsigned comment added by 2.31.130.17 (talk) 22:51, 23 February 2015 (UTC)[reply]

A Commons file used on this page or its Wikidata item has been nominated for deletion

The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:

Busan Film Center.jpg

Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 08:08, 10 October 2021 (UTC)[reply]

[1] This section contains text from SJF Material Handling (http://www.sjf.com/guides/warehouse-storage-rack.html) (Permission Granted September 2008)

[1]