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<div class=Section1>
<p class=MsoNormal><span class=EmailStyle21><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Hi all I failed to give you guys the whole story on mismatched splines
earlier, sorry. <o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle21><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>The Futaba output shaft (25 groove) measures about .235” dia and the
other one with a 24 groove spline in .225” diameter. The Futaba or Futaba
compatible arm will go on the 24-spline shaft and feel snug, not quite right
but snug. It will most likely slip a spline under load especially if it is
bumped. I am far from an expert on this but to my knowledge Futaba and Futaba
copies are the only 25-spline servos.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle21><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Jim Hiller<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle21><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle21><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>J N Hiller<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, August 30, 2007
10:55 AM<br>
<b><span style='font-weight:bold'>To:</span></b> NSRCA Mailing List<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Metal Servo Arms</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><span class=EmailStyle20><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'>Ron sounds like you may have experienced the even /
odd number splines mismatch being used by different manufacturers or
manufacturing tolerance extremes.<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><span class=EmailStyle20><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'>Futaba began using a 25-spline (I counted them 3
times) drive about 20 years ago allowing a 1/4 spline offset (3.6 degrees) with
each approximately 90 rotation. Being a long time Futaba user I was especially
impressed with this change from the previous octagon drive. It greatly enhanced
fine tuning arm to pushrod angles for differential travel. In recent years I
have purchased other brand servos with an even number spline and found that
different servos sold under the same label have a Futaba compatible spline.
Normally the even / odd splines will not even start to assemble but extreme manufacturing
variations may allow mismatched parts to be assembled. I don’t know if any of
the manufacturers conform to a “Standard” or if there is one and if a
manufacturer reverse engineers a product to obtain a dimensional basis for
their product it is easy to deviate from the intended mean dimension,
especially when working with injection molded plastic parts subject to
shrinkage. The aluminum arms are ‘dimensionally stable’ and may be
intentionally sized to be on the tight side to accommodate shrinkage variations
associated with non-stable plastic parts. Better tight than loose. There
appears to be enough inconsistency to warrant a fair amount of skepticism when
mixing brands and needs to be checked every time. <o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><span class=EmailStyle20><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'>What a pain. I am migrating back to using all Futaba
servos.<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><span class=EmailStyle20><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'>Jim Hiller<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><span class=EmailStyle20><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>Ron Van Putte<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, August 30, 2007
8:57 AM<br>
<b><span style='font-weight:bold'>To:</span></b> NSRCA Mailing List<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Metal Servo Arms</span></font><font color=black><span style='color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>I know you
ordered JR arms for JR servos, but be careful that you don't mistake
"tight" with "too tight". I made the mistake of
trying to use a Futaba servo arm on a Hitec 5625MG digital elevator
servo. The arm seemed to fit fine because it was "tight" on the
servo. A couple of flights later, I discovered dramatic elevator trim
changes. The Futaba servo arm was slipping on the Hitec servo's output
shaft. Wasn't fun.</span></font><font color=black><span style='color:
black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>Ron Van Putte</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>On Aug 30,
2007, at 8:36 AM, k6xyz wrote:</span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><br
style='mso-special-character:line-break'>
<![if !supportLineBreakNewLine]><br style='mso-special-character:line-break'>
<![endif]></span></font><font color=black><span style='color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:1.5in'><font size=2 color=blue face="Comic Sans MS"><span comic=""
sans="" ms><span style='font-size:10.0pt;font-family:"Comic Sans MS";
color:blue'>I had the same trouble with these arms.</span></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:1.5in'><font size=2 color=blue face="Comic Sans MS"><span comic=""
sans="" ms><span style='font-size:10.0pt;font-family:"Comic Sans MS";
color:blue'>It seems that the spline in the arm is the right size, but it has
debris or something in there…anyway, I was able to pick out some of the loose
‘stuff’ in the spline and it went on easier but I think it is still too tight.</span></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:1.5in'><font size=2 color=blue face="Comic Sans MS"><span comic=""
sans="" ms><span style='font-size:10.0pt;font-family:"Comic Sans MS";
color:blue'> </span></span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p style='margin-right:.5in;margin-left:1.5in'><font size=2 color=blue
face="Times New Roman"><span style='font-size:10.0pt;color:blue'>Regards<br>
<br>
Dave Harmon<br>
NSRCA 586<br>
K6XYZ[at]sbcglobal[dot]net<br>
Sperry, Ok.</span></font><font color=blue><span style='color:blue'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:2.0in'><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
nsrca-discussion-bounces@lists.nsrca.org [<a
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>twtaylor<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, August 30, 2007
7:50 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <a
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
<b><span style='font-weight:bold'>Subject:</span></b> [NSRCA-discussion] Metal
Servo Arms</span></font><font color=black><span style='color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:2.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'> </span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:2.0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>I bought some Hanger 9
alum servo arms and when I put them on they are VERY hard to get to pull down
on to the servo. Is this normal? They don’t go down as far as the plastic arms
do. They are stamped with a J on the bottom so I assume they’re made for JR
servo’s.</span></font><font color=black><span style='color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:2.0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:2.0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>Tim</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;margin-left:
1.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:
12.0pt;color:black'>_______________________________________________</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;margin-left:
1.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:
12.0pt;color:black'>NSRCA-discussion mailing list</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;margin-left:
1.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:
12.0pt;color:black'><a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;margin-left:
1.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:
12.0pt;color:black'><a
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
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