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If you leave the motor speed the same and have the output cog rotating at half the speed then the torque will increase (though not doubled).</div>
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You should always keep the motor voltage the same as it's designed for that. Note however this arrangement has the possibility of stalling the motor, in the same way that mountains sometimes stall cyclists. So make sure you have some form of protection to
cutout the power if you do get a stall.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Jean-Pierre Desrochers via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 28 November 2025 15:41<br>
<b>To:</b> Synth-diy@synth-diy.org <Synth-diy@synth-diy.org><br>
<b>Subject:</b> [sdiy] Trying to raise my stepper motor torque using different gear installed</font>
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<p class="x_MsoPlainText"><span lang="EN-CA">This is a question for mechanics engineer..</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA"> </span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">I'm using this type of stepper motor in a project:</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA"> </span></p>
<p class="x_MsoPlainText"><b><span lang="EN-CA" style="font-size:12.0pt">SanMotion SF2424-10B41</span></b></p>
<p class="x_MsoPlainText"><span lang="EN-CA">* Bipolar</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">* 200 steps per revolution</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">* 24vdc @ 1A</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">* </span><b><span lang="EN-CA" style="font-size:14.0pt">Torque - Holding (oz-in / mNm) 113.30 / 800</span></b><span lang="EN-CA"></span></p>
<p class="x_MsoPlainText"><span lang="EN-CA"> </span></p>
<p class="x_MsoPlainText"><span lang="EN-CA"><img width="1334" height="1199" id="x_Image_x0020_1" style="width:13.8958in; height:12.4895in" data-outlook-trace="F:1|T:1" src="cid:image001.jpg@01DC6053.93D84AD0"></span><span lang="EN-CA"></span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">Its shaft has a 16 teeth gear installed</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">pulling a small chain.</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">The picture shows the type of gear and chain used</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">to run my system.</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA"> </span></p>
<p class="x_MsoPlainText"><span lang="EN-CA"><img width="402" height="332" id="x_Image_x0020_2" style="width:4.1875in; height:3.4583in" data-outlook-trace="F:1|T:1" src="cid:image002.png@01DC6053.93D84AD0"></span><span lang="EN-CA"></span></p>
<p class="x_MsoPlainText"><span lang="EN-CA"> </span></p>
<p class="x_MsoPlainText"><u><span lang="EN-CA" style="font-size:12.0pt">I'd like to raise up this stepper max usable torque</span></u></p>
<p class="x_MsoPlainText"><span lang="EN-CA">by using a gear with larger number of teeth</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">and lowering the rotation speed accordingly</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">to keep the same final chain pace as the original one.</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">For example: Using a 32 tooth gear and a rotation of half the original 16 teeth’s speed (16/32).</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA"> </span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">My question is</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">Would this modification raise the final torque significantly ?</span></p>
<p class="x_MsoPlainText"><span lang="EN-CA">Keeping the same 24vdc 1A power supply ?</span></p>
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