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KevinOConnor
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Eddy_Probe.html
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@@ -1236,10 +1236,41 @@
<label class="md-nav__link md-nav__link--active" for="__toc">
Eddy Current Inductive probe
<span class="md-nav__icon md-icon"></span>
</label>
<a href="Eddy_Probe.html" class="md-nav__link md-nav__link--active">
Eddy Current Inductive probe
</a>
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
<label class="md-nav__title" for="__toc">
<span class="md-nav__icon md-icon"></span>
Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#thermal-drift-calibration" class="md-nav__link">
Thermal Drift Calibration
</a>
</li>
</ul>
</nav>
</li>
@@ -1286,6 +1317,21 @@
<label class="md-nav__title" for="__toc">
<span class="md-nav__icon md-icon"></span>
Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#thermal-drift-calibration" class="md-nav__link">
Thermal Drift Calibration
</a>
</li>
</ul>
</nav>
</div>
</div>
@@ -1349,6 +1395,91 @@ result in changes in reported Z height. Changes in either the bed
surface temperature or sensor hardware temperature can skew the
results. It is important that calibration and probing is only done
when the printer is at a stable temperature.</p>
<h2 id="thermal-drift-calibration">Thermal Drift Calibration<a class="headerlink" href="#thermal-drift-calibration" title="Permanent link">&para;</a></h2>
<p>As with all inductive probes, eddy current probes are subject to
significant thermal drift. If the eddy probe has a temperature
sensor on the coil it is possible to configure a <code>[temperature_probe]</code>
to report coil temperature and enable software drift compensation. To
link a temperature probe to an eddy current probe the
<code>[temperature_probe]</code> section must share a name with the
<code>[probe_eddy_current]</code> section. For example:</p>
<div class="highlight"><pre><span></span><code>[probe_eddy_current my_probe]
# eddy probe configuration...
[temperature_probe my_probe]
# temperature probe configuration...
</code></pre></div>
<p>See the <a href="Config_Reference.html#temperature_probe">configuration reference</a>
for further details on how to configure a <code>temperature_probe</code>. It is
advised to configure the <code>calibration_position</code>,
<code>calibration_extruder_temp</code>, <code>extruder_heating_z</code>, and
<code>calibration_bed_temp</code> options, as doing so will automate some of the
steps outlined below.</p>
<p>Eddy probe manufacturers may offer a stock drift calibration that can be
manually added to <code>drift_calibration</code> option of the <code>[probe_eddy_current]</code>
section. If they do not, or if the stock calibration does not perform well on
your system, the <code>temperature_probe</code> module offers a manual calibration
procedure via the <code>TEMPERATURE_PROBE_CALIBRATE</code> gcode command.</p>
<p>Prior to performing calibration the user should have an idea of what the
maximum attainable temperature probe coil temperature is. This temperature
should be used to set the <code>TARGET</code> parameter of the
<code>TEMPERATURE_PROBE_CALIBRATE</code> command. The goal is to calibrate across the
widest temperature range possible, thus its desirable to start with the printer
cold and finish with the coil at the maximum temperature it can reach.</p>
<p>Once a <code>[temperature_probe]</code> is configured, the following steps may be taken
to perform thermal drift calibration:</p>
<ul>
<li>The probe must be calibrated using <code>PROBE_EDDY_CURRENT_CALIBRATE</code>
when a <code>[temperature_probe]</code> is configured and linked. This captures
the temperature during calibration which is necessary to perform
thermal drift compensation.</li>
<li>Make sure the nozzle is free of debris and filament.</li>
<li>The bed, nozzle, and probe coil should be cold prior to calibration.</li>
<li>The following steps are required if the <code>calibration_position</code>,
<code>calibration_extruder_temp</code>, and <code>extruder_heating_z</code> options in
<code>[temperature_probe]</code> are <strong>NOT</strong> configured:<ul>
<li>Move the tool to the center of the bed. Z should be 30mm+ above the bed.</li>
<li>Heat the extruder to a temperature above the maximum safe bed temperature.
150-170C should be sufficient for most configurations. The purpose of
heating the extruder is to avoid nozzle expansion during calibration.</li>
<li>When the extruder temperature has settled, move the Z axis down to about 1mm
above the bed.</li>
</ul>
</li>
<li>Start drift calibration. If the probe's name is <code>my_probe</code> and the maximum
probe temperature we can achieve is 80C, the appropriate gcode command is
<code>TEMPERATURE_PROBE_CALIBRATE PROBE=my_probe TARGET=80</code>. If configured, the
tool will move to the X,Y coordinate specified by the <code>calibration_position</code>
and the Z value specified by <code>extruder_heating_z</code>. After heating the extruder
to the specified temperature the tool will move to the Z value specified
by the<code>calibration_position</code>.</li>
<li>The procedure will request a manual probe. Perform the manual probe with
the paper test and <code>ACCEPT</code>. The calibration procedure will take the first
set of samples with the probe then park the probe in the heating position.</li>
<li>If the <code>calibration_bed_temp</code> is <strong>NOT</strong> configured turn on the bed heat
to the maximum safe temperature. Otherwise this step will be performed
automatically.</li>
<li>By default the calibration procedure will request a manual probe every
2C between samples until the <code>TARGET</code> is reached. The temperature delta
between samples can be customized by setting the <code>STEP</code> parameter in
<code>TEMPERATURE_PROBE_CALIBRATE</code>. Care should be taken when setting a custom
<code>STEP</code> value, a value too high may request too few samples resulting in
a poor calibration.</li>
<li>The following additional gcode commands are available during drift
calibration:<ul>
<li><code>TEMPERATURE_PROBE_NEXT</code> may be used to force a new sample before the step
delta has been reached.</li>
<li><code>TEMPERATURE_PROBE_COMPLETE</code> may be used to complete calibration before the
<code>TARGET</code> has been reached.</li>
<li><code>ABORT</code> may be used to end calibration and discard results.</li>
</ul>
</li>
<li>When calibration is finished use <code>SAVE_CONFIG</code> to store the drift
calibration.</li>
</ul>
<p>As one may conclude, the calibration process outlined above is more challenging
and time consuming than most other procedures. It may require practice and several attempts to achieve an optimal calibration.</p>
</article>