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<p>We have used the Air Pux brake system on a lot of scenery. They
are great, almost zero maintenance, reliable. Yes they have a
pretty good price tag, but they are infinitely re-useable and the
systems are tight, no air leaking. <br>
<br>
As to whether you go brake or caster, which failure mode can you
live with? Something that moves when it shouldn't or something
that you can't move when you need it to? Also I think about what
percent of the time it would need air pressure compared to the
amount of time it wouldn't.<br>
<br>
Muffler systems are quite good, so you won't hear a lot of air,
but it often takes more air pressure to lift a heavy unit onto
it's wheels than it takes to push a rubber pad against the floor
hard enough to hold it still. So if you move something a lot, or
it is very big or heavy, you either need a bigger tank, or brakes.</p>
<p>Stuart<br>
</p>
<div class="moz-cite-prefix">On 8/5/2024 10:58 PM, Greg Bierly via
Stagecraft wrote:<br>
</div>
<blockquote type="cite"
cite="mid:985BE468-125D-4D1B-8299-3A160AC2DC35@dejazzd.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Rose Brand sells just such an item but very expensive.
<a class="moz-txt-link-freetext" href="https://www.rosebrand.com/product3896/Pneumatic-Lift-Triple-Swivel-Caster.aspx?tid=2&info=air%2bcaster">https://www.rosebrand.com/product3896/Pneumatic-Lift-Triple-Swivel-Caster.aspx?tid=2&info=air%2bcaster</a><br>
<div>Our first round of air lift casters were octagonal boxes made
out of 2x6 framing with some surplus 1.25” plywood sandwiching
small wagon type inner tubes. They worked but were large and
clunky. We waxed the moving parts to keep them from binding and
used triple swivel casters. </div>
<div>I found any time you are lifting like this, triple swivels
work the best otherwise you tend to side load a standard single
swivel. </div>
<div>Our next set used FABCO pancake cylinders to push the triple
swivels down. Eventually we used spring return cylinders
eliminating duplicate air lines to retract the casters. </div>
<div><br>
</div>
<div>I had stumbled onto a pneumatic locking caster being sold by
Spoon Group a number of years ago at USITT. I was able to
reverse engineer them and make my own for about 1/2 the price.
They are based on the 4” Cartmaster Caster sold by Rose Brand.</div>
<div>
<div style="display: block;">
<div
style="-webkit-user-select: all; -webkit-user-drag: element; display: inline-block;"
class="apple-rich-link" draggable="true" role="link"
data-url="https://www.rosebrand.com/product2877/4-Cartmaster-Caster.aspx?tid=2&info=caster"><a
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class="lp-rich-link" rel="nofollow"
href="https://www.rosebrand.com/product2877/4-Cartmaster-Caster.aspx?tid=2&info=caster"
dir="ltr" role="button" draggable="false" width="300"
moz-do-not-send="true">
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<table
style="font-family:-apple-system, Helvetica, Arial, sans-serif;table-layout:fixed;background-color:rgba(229, 230, 233, 1);"
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class="lp-rich-link-captionBar-textStack">
<div
style="word-wrap:break-word;font-weight:500;font-size:12px;overflow:hidden;text-overflow:ellipsis;text-align:left;"
class="lp-rich-link-captionBar-textStack-topCaption-leading"><a
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style="text-decoration: none"
draggable="false"
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style="color: rgba(0, 0, 0, 0.847059);" color="#272727">4" Cartmaster
Caster from Rose Brand</font></a></div>
<div
style="word-wrap:break-word;font-weight:400;font-size:11px;overflow:hidden;text-overflow:ellipsis;text-align:left;"
class="lp-rich-link-captionBar-textStack-bottomCaption-leading"><a
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draggable="false"
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style="color: rgba(0, 0, 0, 0.498039);" color="#808080">rosebrand.com</font></a></div>
</div>
</td>
<td style="padding:6px 12px 6px 0px;"
class="lp-rich-link-captionBar-rightIconItem" width="36"><a
rel="nofollow"
href="https://www.rosebrand.com/product2877/4-Cartmaster-Caster.aspx?tid=2&info=caster"
draggable="false" moz-do-not-send="true"><img
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src="cid:part1.Xc7BoUcU.88Uk6j58@fuse.net" width="36" height="36"></a></td>
</tr>
</tbody>
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</tr>
</tbody>
</table>
</a></div>
</div>
<div style="display: block;">We CNC’ed the fitting to hold the
caster and include a low profile pancake cylinder. They work
very well on smaller scenery. </div>
<div style="display: block;"><br>
</div>
<div style="display: block;">I have never seen the Spoon Group
caster for sale again (thus the reverse engineering) I did
find the patent for them and have considered reaching out and
seeing if they are for sale anywhere. I feel every theater
should have a dozen in their stock as useful as they are. </div>
</div>
<div><img alt="PastedGraphic-1.tiff"
src="cid:EABD32E9-C077-4F46-8788-FEAFE7F72309"
moz-do-not-send="true"><br>
<br>
<br>
<div>
<div dir="auto"
style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">
<div>Greg Bierly</div>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
<blockquote type="cite">
<div>On Aug 5, 2024, at 5:01 PM, Jon Ares via Stagecraft
<a class="moz-txt-link-rfc2396E" href="mailto:stagecraft@theatrical.net"><stagecraft@theatrical.net></a> wrote:</div>
<div>
<div>Has anyone tried building a system using something like
these,<br>
commonly available today?<br>
<a class="moz-txt-link-freetext" href="https://www.amazon.com/IMPROVED-Commercial-Professional-Alignment-Inflatable/dp/B09F34QGB6/">https://www.amazon.com/IMPROVED-Commercial-Professional-Alignment-Inflatable/dp/B09F34QGB6/</a></div>
</div>
</blockquote>
</div>
<div><br>
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<div><br>
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<br>
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