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Wire ropes use sheaves, not pulleys. That's just what they are
called. A simple force diagram can be used to analyze the load on
the sheave. See below for how it works.<br>
<br>
<img alt="" src="cid:part1.8105976C.174DEC5A@jlab.org" height="469"
width="650"><br>
<br>
<div class="moz-cite-prefix">On 2/27/2017 4:26 PM, Amrit Yegneswaran
wrote:<br>
</div>
<blockquote
cite="mid:809687944.761495.1488230795174.JavaMail.zimbra@jlab.org"
type="cite">
<div style="font-family: tahoma,new york,times,serif; font-size:
14pt; color: #009900">
<div>oops! got confused.<br>
</div>
<div>i was thinking more like a sheaf of wires. <br
data-mce-bogus="1">
</div>
<div>
<div class="vk_ans" style="margin-bottom:0"
data-mce-style="margin-bottom: 0;"><span data-dobid="hdw"
style="color: rgb(0, 0, 255);" data-mce-style="color:
#0000ff;">sheaf</span></div>
<div class="vmod">
<div class="lr_dct_ent_ph"><span style="color: rgb(0, 0,
255);" data-mce-style="color: #0000ff;"><span
class="lr_dct_ph">SHēf/</span><span class="lr_dct_spkr
lr_dct_spkr_off" title="Listen" jsaction="dob.p"
data-ved="0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQlfQBCB0wAA"
style="display: inline-block;"
data-mce-style="display: inline-block;"><input
src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABwAAAAcCAQAAADYBBcfAAABN0lEQVR4AZ3UT4vNYRwF8M+dieS3uNtb7r1lKZPNTNlMWY13gDeBrih7L2A2yka2ItlZYWGrjBJF+VdYjEJTFsI1x9qTX/Ptfp716dmc71m2tzfGPvmibAaI+OOmiZLTdgERETtO2dMJPwVwzHVzEbsu64cVOyIAWPNCRJzVa+yjNEGGHoj4bd1/DT2XNgg6WyJeO6Blv0fSE2Tqu4iZxsBtaYPuOQTgkogPlgGATWmDiG1HAZ1vIjZI/wNEvNMBronYXFJz2HnAQ3C8+mM8BUxEbA9EvwEI+OEg2OcX5ksWVA++AozA13rwDmANvK0G37sK2ACPawX4bKUpwMlK5e4aAbjYVG6xktfP6klzVqVD7twXMbdenw5WPRMR5+pjtepG/1jV5vGMkgv/DPItU3XgpSuOaPwFsUTQA47vSZQAAAAASUVORK5CYII="
data-mce-src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABwAAAAcCAQAAADYBBcfAAABN0lEQVR4AZ3UT4vNYRwF8M+dieS3uNtb7r1lKZPNTNlMWY13gDeBrih7L2A2yka2ItlZYWGrjBJF+VdYjEJTFsI1x9qTX/Ptfp716dmc71m2tzfGPvmibAaI+OOmiZLTdgERETtO2dMJPwVwzHVzEbsu64cVOyIAWPNCRJzVa+yjNEGGHoj4bd1/DT2XNgg6WyJeO6Blv0fSE2Tqu4iZxsBtaYPuOQTgkogPlgGATWmDiG1HAZ1vIjZI/wNEvNMBronYXFJz2HnAQ3C8+mM8BUxEbA9EvwEI+OEg2OcX5ksWVA++AozA13rwDmANvK0G37sK2ACPawX4bKUpwMlK5e4aAbjYVG6xktfP6klzVqVD7twXMbdenw5WPRMR5+pjtepG/1jV5vGMkgv/DPItU3XgpSuOaPwFsUTQA47vSZQAAAAASUVORK5CYII="
height="14" type="image" width="14"></span></span></div>
<div class="vmod">
<div class="lr_dct_sf_h"><span style="color: rgb(0, 0,
255);" data-mce-style="color: #0000ff;"><i>noun</i></span></div>
<div class="xpdxpnd vk_gy" data-mh="-1" aria-hidden="true"><span
style="color: rgb(0, 0, 255);" data-mce-style="color:
#0000ff;">noun: <b>sheaf</b>; plural noun: <b><span
style="color: rgb(255, 0, 0);"
data-mce-style="color: #ff0000;">sheaves<span
id="transmark" style="display: none; width: 0px;
height: 0px;"></span></span></b></span></div>
<ol class="lr_dct_sf_sens">
<li>
<div class="vmod">
<div class="lr_dct_sf_sen vk_txt">
<div style="float:left" data-mce-style="float:
left;"><span style="color: rgb(0, 0, 255);"
data-mce-style="color: #0000ff;"><strong>1</strong>.</span></div>
<div style="margin-left:20px"
data-mce-style="margin-left: 20px;">
<div class="_Jig">
<div style="display:inline" data-dobid="dfn"
data-mce-style="display: inline;"><span
style="color: rgb(0, 0, 255);"
data-mce-style="color: #0000ff;">a bundle
of grain stalks laid lengthwise and tied
together after reaping.</span></div>
</div>
<div style="margin-left:-13px"
data-mce-style="margin-left: -13px;">
<ul>
<li class="xpdxpnd" data-mh="-1"
aria-hidden="true">
<div class="lr_dct_sf_subsen">
<div class="_Jig">
<div style="display:inline"
data-dobid="dfn"
data-mce-style="display: inline;"><span
style="color: rgb(0, 0, 255);"
data-mce-style="color: #0000ff;">a
bundle of objects of one kind,
especially papers.</span></div>
<div class="vk_gy"><span style="color:
rgb(0, 0, 255);"
data-mce-style="color: #0000ff;">"he
waved <b>a sheaf of</b> papers in
the air"</span></div>
<div class="vmod">
<table class="vk_tbl vk_gy">
<tbody>
<tr>
<td class="lr_dct_nyms_ttl"
style="padding-right:3px"
data-mce-style="padding-right:
3px;"><span style="color:
rgb(0, 0, 255);"
data-mce-style="color:
#0000ff;">synonyms:</span></td>
<td><span style="color: rgb(0,
0, 255);"
data-mce-style="color:
#0000ff;"><a
moz-do-not-send="true"
href="https://www.google.com/search?q=define+bundle&forcedict=bundle&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIDAA"
data-ved="0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIDAA"
data-mce-href="https://www.google.com/search?q=define+bundle&forcedict=bundle&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIDAA"><span
style="color: rgb(0,
0, 255);"
data-mce-style="color:
#0000ff;">bundle</span></a>,
<a moz-do-not-send="true"
href="https://www.google.com/search?q=define+bunch&forcedict=bunch&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIITAA"
data-ved="0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIITAA"
data-mce-href="https://www.google.com/search?q=define+bunch&forcedict=bunch&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIITAA"><span
style="color: rgb(0,
0, 255);"
data-mce-style="color:
#0000ff;">bunch</span></a>,
<a moz-do-not-send="true"
href="https://www.google.com/search?q=define+stack&forcedict=stack&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIjAA"
data-ved="0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIjAA"
data-mce-href="https://www.google.com/search?q=define+stack&forcedict=stack&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIjAA"><span
style="color: rgb(0,
0, 255);"
data-mce-style="color:
#0000ff;">stack</span></a>,
<a moz-do-not-send="true"
href="https://www.google.com/search?q=define+pile&forcedict=pile&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIzAA"
data-ved="0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIzAA"
data-mce-href="https://www.google.com/search?q=define+pile&forcedict=pile&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIIzAA"><span
style="color: rgb(0,
0, 255);"
data-mce-style="color:
#0000ff;">pile</span></a>,
<a moz-do-not-send="true"
href="https://www.google.com/search?q=define+heap&forcedict=heap&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIJDAA"
data-ved="0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIJDAA"
data-mce-href="https://www.google.com/search?q=define+heap&forcedict=heap&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIJDAA"><span
style="color: rgb(0,
0, 255);"
data-mce-style="color:
#0000ff;">heap</span></a>,
<a moz-do-not-send="true"
href="https://www.google.com/search?q=define+mass&forcedict=mass&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIJTAA"
data-ved="0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIJTAA"
data-mce-href="https://www.google.com/search?q=define+mass&forcedict=mass&sa=X&ved=0ahUKEwiRioGvm7HSAhXrhlQKHZoiBukQ_SoIJTAA"><span
style="color: rgb(0,
0, 255);"
data-mce-style="color:
#0000ff;">mass</span></a>
</span>
<div style="display:inline"
data-mce-style="display:
inline;">
<div
style="display:inline"
data-mce-style="display:
inline;">
<div class="vk_gy"><span
style="color: rgb(0,
0, 255);"
data-mce-style="color:
#0000ff;">"a sheaf
of papers"</span></div>
</div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</li>
</ul>
</div>
</div>
</div>
</div>
</li>
</ol>
</div>
<div class="vmod">
<div class="lr_dct_sf_h"><span style="color: rgb(0, 0,
255);" data-mce-style="color: #0000ff;"><i>verb</i></span></div>
<div class="xpdxpnd vk_gy" data-mh="-1" aria-hidden="true"><span
style="color: rgb(0, 0, 255);" data-mce-style="color:
#0000ff;">verb: <b>sheaf</b>; 3rd person present: <b>sheafs</b>;
past tense: <b>sheafed</b>; past participle: <b>sheafed</b>;
gerund or present participle: <b>sheafing</b></span></div>
<ol class="lr_dct_sf_sens">
<li>
<div class="vmod">
<div class="lr_dct_sf_sen vk_txt">
<div style="float:left" data-mce-style="float:
left;"><span style="color: rgb(0, 0, 255);"
data-mce-style="color: #0000ff;"><strong>1</strong>.</span></div>
<div style="margin-left:20px"
data-mce-style="margin-left: 20px;">
<div class="_Jig">
<div style="display:inline" data-dobid="dfn"
data-mce-style="display: inline;"><span><span
style="color: rgb(0, 0, 255);"
data-mce-style="color: #0000ff;">bundle
into sheaves.</span></span></div>
</div>
</div>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div>but then again, why didn't you say pulley!<br
data-mce-bogus="1">
</div>
<div>anyway the answer is out there!<br data-mce-bogus="1">
</div>
<div>i.e. i don't know!<br data-mce-bogus="1">
</div>
<div><br>
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"George Jacobs"
<a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br>
<b>To: </b>"Amrit Yegneswaran" <a class="moz-txt-link-rfc2396E" href="mailto:yeg@jlab.org"><yeg@jlab.org></a><br>
<b>Cc: </b>"Marco Mirazita"
<a class="moz-txt-link-rfc2396E" href="mailto:Marco.Mirazita@lnf.infn.it"><Marco.Mirazita@lnf.infn.it></a>, "Tyler Lemon"
<a class="moz-txt-link-rfc2396E" href="mailto:tlemon@jlab.org"><tlemon@jlab.org></a>, "dsg-rich" <a class="moz-txt-link-rfc2396E" href="mailto:dsg-rich@jlab.org"><dsg-rich@jlab.org></a>,
"Bob Miller" <a class="moz-txt-link-rfc2396E" href="mailto:rmiller@jlab.org"><rmiller@jlab.org></a><br>
<b>Sent: </b>Monday, February 27, 2017 3:51:23 PM<br>
<b>Subject: </b>Re: [Dsg-rich] RICH assembly<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">The sheave is the "pulley",
not the wire rope.<br>
<br>
<div class="moz-cite-prefix">On 2/27/2017 3:17 PM, Amrit
Yegneswaran wrote:<br>
</div>
<blockquote
cite="mid:575312605.742994.1488226663873.JavaMail.zimbra@jlab.org">
<div style="font-family: tahoma,new york,times,serif;
font-size: 14pt; color: #009900"
data-mce-style="font-family: tahoma,new york,times,serif;
font-size: 14pt; color: #009900;">
<div>hi george,<br>
</div>
<div>my understanding is that a 7x19 cable is used.<br>
</div>
<div>the breaking load for this cable, as per the manual,
is 5559 Kg, much greater than 2x the tension (1550 Kg)<br>
</div>
<div>amrit<br>
</div>
<div><img moz-do-not-send="true" class="shrinkToFit"
alt="http://www.bergencable.com/technology/images/7x19str.jpg"
src="http://www.bergencable.com/technology/images/7x19str.jpg"
height="398" width="498"></div>
<div><br>
</div>
<div><br>
</div>
<hr id="zwchr">
<div><b>From: </b>"George Jacobs" <a
moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:jacobsg@jlab.org" target="_blank"
data-mce-href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br>
<b>To: </b>"Marco Mirazita" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:Marco.Mirazita@lnf.infn.it"
target="_blank"
data-mce-href="mailto:Marco.Mirazita@lnf.infn.it"><Marco.Mirazita@lnf.infn.it></a>,
"Tyler Lemon" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:tlemon@jlab.org" target="_blank"
data-mce-href="mailto:tlemon@jlab.org"><tlemon@jlab.org></a><br>
<b>Cc: </b>"dsg-rich" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:dsg-rich@jlab.org" target="_blank"
data-mce-href="mailto:dsg-rich@jlab.org"><dsg-rich@jlab.org></a>,
"Bob Miller" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:rmiller@jlab.org" target="_blank"
data-mce-href="mailto:rmiller@jlab.org"><rmiller@jlab.org></a><br>
<b>Sent: </b>Monday, February 27, 2017 1:33:59 PM<br>
<b>Subject: </b>Re: [Dsg-rich] RICH assembly<br>
</div>
<div><br>
</div>
<div>What are the calculations on the wire rope sheave?
Looks to me it's overloaded as it will see nearly 2X the
wire rope tension as it's total load.<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 2/22/2017 10:34 AM,
Marco Mirazita wrote:<br>
</div>
<blockquote
cite="mid:0993815e72ea3080dfd89d8fcfb8797a@webmail.lnf.infn.it">Hi
all, <br>
here we try to answer to the questions raised in the
last couple of days on the RICH assembly. <br>
<br>
1) Winch load <br>
The weight of the RICH fully assembled is about 1000
kg, including the stiffening elements. This would be
the number to be consider if we had to lift the RICH
from the floor with the winch. <br>
Instead, we want to use the winch to rotate the RICH
on top of the assembly structure. Thus, the maximum
pull force that the winch must apply has to be
calculated in this conditions. This has been done time
ago, as you can see in the two attached slides. The
resulting maximum pull force is about 7750 N, with a
25% safety margin we reach 9700 N, that is a weight of
990 kg, lower than 1000 kg. <br>
The procedure for the load test should be defined
based on the foreseen usage of the winch. <br>
<br>
2) Eye bolt <br>
We agree to use the hoist ring as suggested by George.
The depth of the threaded hole in the aluminum angular
element of the RICH is 50 mm. The bolt is screwed to
the RICH passing through the bar of the stiffening
element, which is 10 mm thick, 15 mm if we consider
also the washers. We need to screw the M24 bolt at
least for a depth of 35 mm in order to have a grade 8
connection. Thus the bolt should be at least 35+15=50
mm. <br>
If JLab can provide them, it would be great. <br>
<br>
3) Assembly structure <br>
We thank DSG to have volunteered to continue the
assembly of the structures. We agree that the early
completion of the assembly will save time for the many
other tasks we have to do, so please go on. We suggest
you to perform a preliminary planarity check of the
base plates before mounting the vertical posts. A
final alignment check of the structure can be done
when Dario and Sandro will be at JLab on march 6, and
then you can proceed together with the assembly of the
rotation elements. Please don't hesitate to contact us
in case of doubts or troubles. <br>
<br>
4) Documentation <br>
We are preparing the documentation for the assembly
procedure of the electronic panel support. We will
also include the description of the mechanical
assembly of the boards on the panel. <br>
The assembly of the mirrors will not be done before
few months. In addition, we planned in the next weeks
a test of the assembly of the aerogel on the planar
mirrors. The results of these tests may impact the
procedure of the mirror assembly, thus we will work on
the procedure documentation after these tests. <br>
For the electronics tests, it is up to the electronic
group. <br>
<br>
Dario, Marco, Sandro, Vincenzo <br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
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</pre>
</blockquote>
<br>
<pre class="moz-signature">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org" target="_blank" data-mce-href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" target="_blank" data-mce-href="https://userweb.jlab.org/%7Ejacobsg">https://userweb.jlab.org/~jacobsg</a>
</pre>
<br>
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Dsg-rich mailing list<br>
<a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:Dsg-rich@jlab.org" target="_blank"
data-mce-href="mailto:Dsg-rich@jlab.org">Dsg-rich@jlab.org</a><br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://mailman.jlab.org/mailman/listinfo/dsg-rich"
target="_blank"
data-mce-href="https://mailman.jlab.org/mailman/listinfo/dsg-rich">https://mailman.jlab.org/mailman/listinfo/dsg-rich</a><br>
</div>
</div>
</blockquote>
<br>
<pre class="moz-signature">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org" target="_blank" data-mce-href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" target="_blank" data-mce-href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a>
</pre>
<br>
</div>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a></pre>
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