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Subject: Re: [LML] Re: LIVP Broken screw on door handle
From: bob mackey <n103md@yahoo.com>
X-Original-To: lml@lancaironline.net
Content-Type: multipart/alternative; boundary=047d7b676af2a0135604ed1523d2

--047d7b676af2a0135604ed1523d2
Content-Type: text/plain; charset=ISO-8859-1

> When a little screw won't work....Use a bigger screw!

Actually, that does not look like good advice in this case. The photo
clearly shows that torque applied to the handle applies a bending load  to
the screw.

http://lancair.net/lists/lml/Message/68158-02-B/IMG_2320-s.jpg

Even worse, the bending load is applied to the threaded portion of the
screw. Failure is inevitable. A bigger screw would last longer before
breaking.

Better would be to redesign that part so that the torque on the handle is
applied to an arm that is clamped on, or maybe keyed, or maybe even a roll
pin. Has anyone broken the roll pin that holds the handle onto that same
shaft? Another option would be a shoulder bolt with the shoulder submerged
a few diameters into the shaft. Then the threads would not see the bending
load.

--047d7b676af2a0135604ed1523d2
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">&gt;=A0<font color=3D"black" face=3D"arial"><font style=3D=
"background-color:transparent" face=3D"Arial, Helvetica, sans-serif">When a=
 little screw won&#39;t work....Use a bigger screw!</font></font><div><font=
 color=3D"black" face=3D"arial"><font style=3D"background-color:transparent=
" face=3D"Arial, Helvetica, sans-serif"><br>
</font></font></div><div><font color=3D"black" face=3D"arial"><font style=
=3D"background-color:transparent" face=3D"Arial, Helvetica, sans-serif">Act=
ually, that does not look like good advice in this case. The photo clearly =
shows that torque applied to the handle applies a bending load =A0to the sc=
rew.=A0</font></font></div>
<div><font color=3D"black" face=3D"arial"><font style=3D"background-color:t=
ransparent" face=3D"Arial, Helvetica, sans-serif"><br></font></font></div><=
div><font color=3D"#000000" face=3D"Arial, Helvetica, sans-serif"><a href=
=3D"http://lancair.net/lists/lml/Message/68158-02-B/IMG_2320-s.jpg">http://=
lancair.net/lists/lml/Message/68158-02-B/IMG_2320-s.jpg</a></font></div>
<div><font color=3D"black" face=3D"arial"><font style=3D"background-color:t=
ransparent" face=3D"Arial, Helvetica, sans-serif"><br></font></font></div><=
div><font color=3D"black" face=3D"arial"><font style=3D"background-color:tr=
ansparent" face=3D"Arial, Helvetica, sans-serif">Even worse, the bending lo=
ad is applied to the threaded portion of the screw. Failure is inevitable. =
A bigger screw would last longer before breaking.</font></font></div>
<div><font color=3D"black" face=3D"arial"><font style=3D"background-color:t=
ransparent" face=3D"Arial, Helvetica, sans-serif"><br></font></font></div><=
div><font color=3D"black" face=3D"arial"><font style=3D"background-color:tr=
ansparent" face=3D"Arial, Helvetica, sans-serif">Better would be to redesig=
n that part so that the torque on the handle is applied to an arm that is c=
lamped on, or maybe keyed, or maybe even a roll pin. Has anyone broken the =
roll pin that holds the handle onto that same shaft? Another option would b=
e a shoulder bolt with the shoulder submerged a few diameters into the shaf=
t. Then the threads would not see the bending load.=A0</font></font></div>
</div>

--047d7b676af2a0135604ed1523d2--