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Retired Reviewer
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Discussion Starter #1
<p></p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770569/"><img alt="Cleanup Shots 014.jpg" class="lightbox-enabled" data-id="1770569" data-type="61" src="http://www.overclock.net/content/type/61/id/1770569/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>I received some Cooler Master Jetflo fans. They are advertised as having “Fourth Generation” bearings made of polyoxymethylene (POM, otherwise known as Delryn).</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770572/"><img alt="CM Jetflo - 1 003.jpg" class="lightbox-enabled" data-id="1770572" data-type="61" src="http://www.overclock.net/content/type/61/id/1770572/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>The Jetflo POM bearing differs from <span style="text-decoration:underline;"><a href="http://www.overclock.net/t/1421591/sickle-flow-and-sickleflow-x-anatomy-lessons/0_30" target="_blank">the Sickle Flow X bearing I took apart previously</a></span>. That one was essentially a sealed sleeve bearing, just like the original Sickle Flow bearing, but made with POM so it would last a long time. This . . . second generation . . . of the POM bearing (4th gen, Mark 2?) differs from that one. This one is supposedly water proof and dust proof. How is it made?</p>
<p> </p>
<p>Here is Cooler Master’s drawing of the POM bearing, Mark 2. The orange represents POM. POM in its natural state is black:</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770593/"><img alt="jetflo-7.jpg" class="lightbox-enabled" data-id="1770593" data-type="61" src="http://www.overclock.net/content/type/61/id/1770593/width/500/height/1000/flags/LL" style="; width: 500px; height: 273px"></a></p>
<p> </p>
<p>I took one apart to see what this bearing is made of. So let us start with the frame, and peel off the label. We can see a steel plug surrounded by what looks like a brass ring. It is actually a brass case, as we shall see later.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770577/"><img alt="CM Jetflo - 2 010.jpg" class="lightbox-enabled" data-id="1770577" data-type="61" src="http://www.overclock.net/content/type/61/id/1770577/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>I pounded on the steel plug with a punch and never pushed it through. I pried and pried until the blade-and-motor assembly finally pulled away from the frame. Since we can see that the plastic was more soft than rigid, I should have taken a heat gun to it. Ah, well. Next time.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770578/"><img alt="CM Jetflo - 2 014.jpg" class="lightbox-enabled" data-id="1770578" data-type="61" src="http://www.overclock.net/content/type/61/id/1770578/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>This shot shows where I pounded on the steel plug. No wonder I couldn’t pound it through. Look at those cleats! The picture also shows one very scuffed circuit board.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770579/"><img alt="CM Jetflo - 2 015.jpg" class="lightbox-enabled" data-id="1770579" data-type="61" src="http://www.overclock.net/content/type/61/id/1770579/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>Would the circuit board still work? I tried the fan, now that it was free of the frame. It wouldn’t spin, but it did light up.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770580/"><img alt="CM Jetflo - 2 016.jpg" class="lightbox-enabled" data-id="1770580" data-type="61" src="http://www.overclock.net/content/type/61/id/1770580/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p> </p>
<p>Now let us peel the Cooler Master label off the fan head. The blade disk (the blades are part of it) is a translucent plastic.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770581/"><img alt="CM Jetflo - 2 018.jpg" class="lightbox-enabled" data-id="1770581" data-type="61" src="http://www.overclock.net/content/type/61/id/1770581/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>The blade disk did pull off.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770582/"><img alt="CM Jetflo - 2 021.jpg" class="lightbox-enabled" data-id="1770582" data-type="61" src="http://www.overclock.net/content/type/61/id/1770582/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>And I was able to push the bearing out of the motor assembly.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770583/"><img alt="CM Jetflo - 2 024.jpg" class="lightbox-enabled" data-id="1770583" data-type="61" src="http://www.overclock.net/content/type/61/id/1770583/width/500/height/1000/flags/LL" style="; width: 500px; height: 375px"></a></p>
<p> </p>
<p>A closeup of the 4th generation bearing, Mark 2:</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770584/"><img alt="CM Jetflo - 2 026.jpg" class="lightbox-enabled" data-id="1770584" data-type="61" src="http://www.overclock.net/content/type/61/id/1770584/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>I took my hacksaw and cut off the steel tip.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770585/"><img alt="CM Jetflo - 2 028.jpg" class="lightbox-enabled" data-id="1770585" data-type="61" src="http://www.overclock.net/content/type/61/id/1770585/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>Clearly the steel is just an insert in the brass casing.</p>
<p> </p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770586/"><img alt="CM Jetflo - 2 029.jpg" class="lightbox-enabled" data-id="1770586" data-type="61" src="http://www.overclock.net/content/type/61/id/1770586/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>I reassembled the pieces so you can see how they relate:</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770587/"><img alt="CM Jetflo - 2 031.jpg" class="lightbox-enabled" data-id="1770587" data-type="61" src="http://www.overclock.net/content/type/61/id/1770587/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>Another attack with the hacksaw, and the retaining disk comes away. The mushroom top of the shaft pops through the retaining disk, which -- um – retains the shaft in the bearing assembly.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770588/"><img alt="CM Jetflo - 2 033.jpg" class="lightbox-enabled" data-id="1770588" data-type="61" src="http://www.overclock.net/content/type/61/id/1770588/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>With the retaining disk off, the shaft comes out. Inside the brass case, the barrier ring faces us.</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770589/"><img alt="CM Jetflo - 2 034.tif" class="lightbox-enabled" data-id="1770589" data-type="61" src="http://www.overclock.net/content/type/61/id/1770589/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>Pushing the contents out of the case, we see the POM bearing cylinder and the barrier ring:</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770590/"><img alt="CM Jetflo - 2 036.jpg" class="lightbox-enabled" data-id="1770590" data-type="61" src="http://www.overclock.net/content/type/61/id/1770590/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p> </p>
<p>I have assembled the pieces of the bearing:</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770591/"><img alt="CM Jetflo - 2 038.jpg" class="lightbox-enabled" data-id="1770591" data-type="61" src="http://www.overclock.net/content/type/61/id/1770591/width/500/height/1000/flags/LL" style="; width: 500px; height: 334px"></a></p>
<p> </p>
<p>The same picture, with the pieces numbered in the order they occur in the bearing:</p>
<p></p>
<p>1. The tip of the shaft that sticks into the plastic blade disk</p>
<p>2. The barrier ring and the part of the shaft that penetrates it.</p>
<p>3. The POM cylinder, the part of the shaft that penetrates it and the brass case.</p>
<p>4. The retaining disk and the end the shaft that penetrates it.</p>
<p>5. The end cap, with its steel plug.</p>
<p></p>
<p style="text-indent:-.25in;"> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770592/"><img alt="CM Jetflo - 2 038a.png" class="lightbox-enabled" data-id="1770592" data-type="61" src="http://www.overclock.net/content/type/61/id/1770592/width/500/height/1000/flags/LL" style="; width: 500px; height: 334px"></a></p>
<p> </p>
<p> </p>
<p>The Cooler Master drawing again. The barrier ring is at the top, the retaining ring at the bottom:</p>
<p> </p>
<p style="text-align:center;"><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770593/"><img alt="jetflo-7.jpg" class="lightbox-enabled" data-id="1770593" data-type="61" src="http://www.overclock.net/content/type/61/id/1770593/width/500/height/1000/flags/LL" style="; width: 500px; height: 273px"></a></p>
<p> </p>
<p> </p>
<p>I hope you have enjoyed our little tour through the innards of the Cooler Master Jetflo. BTW – look at those rubber corners. They really do dampen vibration.</p>
<p></p>
 

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⤷ αC
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11,240 Posts
Not directly related:<br><br>
Delryn smells when you try to machine it. That's what I remember about Delyrn besides it being stiff like ABS plastic <img alt="tongue.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/tongue.gif"><br><br>
Thanks for the overview EHume , will we be seeing noise comparisons since you broke the fan <img alt="tongue.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/tongue.gif">
 

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Retired Reviewer
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Discussion Starter #3
<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21301522" data-huddler-embed-placeholder="false">Quote:
<div class="quote-block">Originally Posted by <strong>AlphaC</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21301522"><img alt="View Post" src="/img/forum/go_quote.gif" style=""></a><br><br>
Not directly related:<br><br>
Delryn smells when you try to machine it. That's what I remember about Delyrn besides it being stiff like ABS plastic <img alt="tongue.gif" src="http://files.overclock.net/images/smilies/tongue.gif"><br><br>
Thanks for the overview EHume , will we be seeing noise comparisons since you broke the fan <img alt="tongue.gif" src="http://files.overclock.net/images/smilies/tongue.gif"></div>
</div>
<p>Yes, but at Overclockers. I will post the link when I'm done and it is published.</p>
 

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r/madlads
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8,705 Posts
I'm interested in the noise ratings. I've always always mocked CM fans for being very way off listed specs, this being the new baby in the lineup i hope it might change ... Maybe not. (And now their most expensive fan)<br><br>
*Jon is watching!*
 

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Thanks ehume.<br>
Nice bit of work. <img alt="thumb.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/thumb.gif">
 

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Retired Reviewer
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Discussion Starter #6
<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21301522" data-huddler-embed-placeholder="false">Quote:
<div class="quote-block">Originally Posted by <strong>AlphaC</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21301522"><img alt="View Post" src="/img/forum/go_quote.gif" style=""></a><br><br>
Not directly related:<br><br>
Delryn smells when you try to machine it. That's what I remember about Delyrn besides it being stiff like ABS plastic <img alt="tongue.gif" src="http://files.overclock.net/images/smilies/tongue.gif"><br><br>
Thanks for the overview EHume , will we be seeing noise comparisons since you broke the fan <img alt="tongue.gif" src="http://files.overclock.net/images/smilies/tongue.gif"></div>
</div>
<p><br>
AlphaC - were you successful when you machined Delryn?</p>
 

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⤷ αC
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11,240 Posts
It's been a while.<br><br>
I was making a roller (or was it a bushing?) for a robotic mechanism and it was put on lathe to make the roller smaller. It has an acidic smell (maybe because of the acetal component) if I recall correctly.<br><br>
It cuts like butter and machines really smooth. The big problem is the smell (possibly toxic?) due to low melting point.
 

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Turtle Lives Matter
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Are these fans worth it? I nearly bought some for this build, but stuck with the good Ole sickleflows that are so cheap.
 

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Discussion Starter #9
<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21316407" data-huddler-embed-placeholder="false">Quote:
<div class="quote-block">Originally Posted by <strong>damric</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21316407"><img alt="View Post" src="/img/forum/go_quote.gif" style=""></a><br><br>
Are these fans worth it? I nearly bought some for this build, but stuck with the good Ole sickleflows that are so cheap.</div>
</div>
<p><br>
These fans outperform their specs. Even pulling behind a dust filter the Jetflo pushes out 95 CFM. And they speed up behind the filter. They are strong fans.</p>
 

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<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures#post_21316603" data-huddler-embed-placeholder="false"><span>Quote:</span>
<div class="quote-block">Originally Posted by <strong>ehume</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures#post_21316603"><img alt="View Post" class="inlineimg" src="/img/forum/go_quote.gif"></a><br><br><div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21316407" data-huddler-embed-placeholder="false">Quote:
<div class="quote-block">Originally Posted by <strong>damric</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21316407"><img alt="View Post" src="/img/forum/go_quote.gif" style=""></a><br><br>
Are these fans worth it? I nearly bought some for this build, but stuck with the good Ole sickleflows that are so cheap.</div>
</div>
<p><br>
These fans outperform their specs. Even pulling behind a dust filter the Jetflo pushes out 95 CFM. And they speed up behind the filter. They are strong fans.</p>
</div>
</div>
<br>
How loud are they?<br><br>
Sent from my SM-N900V using Tapatalk
 

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Retired Reviewer
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Discussion Starter #11
<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21320070" data-huddler-embed-placeholder="false">Quote:
<div class="quote-block">Originally Posted by <strong>koniu777</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21320070"><img alt="View Post" src="/img/forum/go_quote.gif" style=""></a><br>
 
<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures#post_21316603" data-huddler-embed-placeholder="false">Quote:
<div class="quote-block">Originally Posted by <strong>ehume</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures#post_21316603"><img alt="View Post" src="/img/forum/go_quote.gif" style=""></a><br>
 
<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21316407" data-huddler-embed-placeholder="false">Quote:
<div class="quote-block">Originally Posted by <strong>damric</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21316407"><img alt="View Post" src="/img/forum/go_quote.gif" style=""></a><br><br>
Are these fans worth it? I nearly bought some for this build, but stuck with the good Ole sickleflows that are so cheap.</div>
</div>
<p><br>
These fans outperform their specs. Even pulling behind a dust filter the Jetflo pushes out 95 CFM. And they speed up behind the filter. They are strong fans.</p>
</div>
</div>
<br>
How loud are they?<br><br>
Sent from my SM-N900V using Tapatalk</div>
</div>
<p><br>
They are right on spec for 2000 RPM. The other RPM's are louder than spec, by my measurement. YMMV. I had a visit to the ER eat up all my time tonight. I'm hoping to complete the article tomorrow.</p>
 

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<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/10#post_21324875" data-huddler-embed-placeholder="false"><span>Quote:</span>
<div class="quote-block">Originally Posted by <strong>ehume</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/10#post_21324875"><img alt="View Post" class="inlineimg" src="/img/forum/go_quote.gif"></a><br><br><br>
They are right on spec for 2000 RPM. The other RPM's are louder than spec, by my measurement. YMMV. I had a visit to the ER eat up all my time tonight. I'm hoping to complete the article tomorrow.</div>
</div>
I hope everything's OK now
 

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its an airplane on 100% <img alt="tongue.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/tongue.gif"> but in a close case at 50% you almost cant hear it.
 

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I Am Gooble Gobble
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6,611 Posts
i saw a lack of well.... oil around said bearing..........unless ofc you drained it before showing us.
 

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Retired Reviewer
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Discussion Starter #15
<div class="quote-container" data-huddler-embed="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21329434" data-huddler-embed-placeholder="false">Quote:
<div class="quote-block">Originally Posted by <strong>PCSarge</strong> <a href="/t/1447314/cooler-master-jetflo-anatomy-of-pom-bearings-pictures/0_30#post_21329434"><img alt="View Post" src="/img/forum/go_quote.gif" style=""></a><br><br>
i saw a lack of well.... oil around said bearing..........unless ofc you drained it before showing us.</div>
</div>
<p><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1770582/"><img alt="" class="lightbox-enabled" data-id="1770582" data-type="61" src="http://www.overclock.net/content/type/61/id/1770582/width/500/height/1000/flags/LL" style="; width: 500px; height: 500px"></a></p>
<p><br>
Oil.</p>
<p> </p>
<p>OTOH, it shouldn't need it, right?</p>
 

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Its a POM material which is self-lubricating. In a sealed bearing that contributes to long lifetimes. It doesn't have the amount of oil you are used to seeing in an HDB or FDB fan because it doesn't need it.
 

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Discussion Starter #17
<p>Reviews on this beast:</p>
<p> </p>
<p><a href="http://www.overclockers.com/cooler-master-jetflo-fan-review" target="_blank"><span style="text-decoration:underline;">here</span></a>, and <span style="text-decoration:underline;"><a href="http://www.vortez.net/articles_pages/cooler_master_jetflo_review,1.html" target="_blank">here</a></span>.</p>
 

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CS+EE Alumnus
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10,321 Posts
<p>Interesting...</p>
<p> </p>
<p>Also, any plans on doing a huge fan roundup (like hardware.fr or hardware.info UK)? Just curious.</p>
 

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Discussion Starter #19
<p>People would have to send me enough to do something. The closest thing I have done is items 1 and 4 in my sig, and <span style="text-decoration:underline;"><a href="http://www.vortez.net/articles_pages/120mm_and_140mm_fan_comparison,1.html" target="_blank">this</a></span>. Now that I have an anemometer, I may revisit with that.</p>
 

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the fans looks great but noisy on 100%, I have 5 of them in my case.
 
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