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<DIV><FONT size=2>That's the point of maximum shear. The end is point of maximum moment.</FONT></DIV>
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<DIV>ORLANDO FRETS</DIV>
<DIV><A href="mailto:ojfrets@earthlink.net">ojfrets@earthlink.net</A></DIV>
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<DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=knowhow3@bellsouth.net href="mailto:knowhow3@bellsouth.net">Rick Kent</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To: </B><A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> 2/15/2005 2:56:38 PM </DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: 4-40 or 6-32 control arms?</DIV>
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<DIV>Is the failure point on these bolts always at the base where it goes into the control surface? Never having had a failure of one, I don't know, but physics kind of dictates that it would be.</DIV>
<DIV>If so, why wouldn't a socket head or other type bolt that is only partially threaded work better, since it would remove the stress risers (threads) at the base area, where the force is concentrated. Lop off the bolt head and glue it in. The smooth portion of the bolt could easily be roughed up with a Dremel sanding drum or cutoff wheel for CA or epoxy to grip it going into the control surface.</DIV>
<DIV> </DIV>
<DIV>Am I missing something obvious here with this idea?</DIV>
<DIV> </DIV>
<DIV>Rick</DIV>
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<DIV id=IncrediOriginalMessage><I>-------Original Message-------</I></DIV>
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<DIV id=receivestrings>
<DIV dir=ltr style="FONT-SIZE: 11pt" <i><B>From:</B></I> <A href="mailto:discussion@nsrca.org">discussion@nsrca.org</A></DIV>
<DIV dir=ltr style="FONT-SIZE: 11pt" <i><B>Date:</B></I> Tuesday, February 15, 2005 02:42:37 PM</DIV>
<DIV dir=ltr style="FONT-SIZE: 11pt" <i><B>To:</B></I> <A href="mailto:discussion@nsrca.org">discussion@nsrca.org</A></DIV>
<DIV dir=ltr style="FONT-SIZE: 11pt" <i><B>Subject:</B></I> Re: 4-40 or 6-32 control arms?</DIV></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Well it looks like the standard 6-32 threaded bolt from the ACE Hardware bin is they way to go. That is what I have been using all along I just haven't heard the pro's and con's on the subject. I use the flat head bolt and counter sink the hard point. Using the 1/4" 6-32 threaded aluminum sleeve as a stand off seems to give them a lot of strength and locks the bolt to the control surface.</FONT></DIV>
<DIV><FONT face=Arial size=2>Although I have seen them used with out this stand off too. </FONT></DIV>
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<DIV><FONT face=Arial size=2>Wayne G.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=ronlock@comcast.net href="mailto:ronlock@comcast.net">ronlock@comcast.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, February 14, 2005 11:09 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: 4-40 or 6-32 control arms?</DIV>
<DIV><BR></DIV>
<DIV>Ive been using all thread rods from hardware store.</DIV>
<DIV>It's my understanding those are less likely to break than bolts.</DIV>
<DIV>No problems with older 1.20 YS bird or current OS 1.40.</DIV>
<DIV> </DIV>
<DIV>Ron Lockhart</DIV>
<DIV style="PADDING-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid; rem_MARGIN-LEFT: 5px">-------------- Original message -------------- <BR>
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<DIV>Which brings up a good point here.</DIV>
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<DIV>Do you use steel bolts or stainless steel bolts.</DIV>
<DIV>Stainless is a softer material and would it be prone to breaking easier?</DIV>
<DIV>Or is the harder steel bolt more likely to snap under vibrating conditions?</DIV>
<DIV> </DIV>
<DIV>Wayne G.</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=Rcmaster199@aol.com href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, February 14, 2005 9:09 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: 4-40 or 6-32 control arms?</DIV>
<DIV><BR></DIV><FONT id=role_document face=Arial color=#000000 size=2>
<DIV>
<DIV>In a message dated 2/14/2005 12:22:29 AM Eastern Standard Time, <A href="mailto:ed_alt@hotmail.com">ed_alt@hotmail.com</A> writes:</DIV>
<DIV style="PADDING-LEFT: 5px; BORDER-LEFT: blue 2px solid; rem_MARGIN-LEFT: 5px"><FONT style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>
<DIV>I've been using 6-32 bolts to make the control horn arms for my 2M setups so far. It seems like that might be overkill and that 4-40 would suffice. Is it OK to go lighter like this?</DIV>
<DIV> </DIV>
<DIV>Thanks</DIV>
<DIV>Ed A.</DIV></FONT></DIV></DIV>
<DIV> </DIV>
<DIV>Ed I wouldn't do that especially on ailerons. I have had 4-40's snap off like twigs on 90 sized models before. The vibration kills them.</DIV>
<DIV> </DIV>
<DIV>Matt</DIV></DIV></FONT></DIV></DIV>
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