<div dir="ltr">Kathleen,<div><br></div><div>The hole through the stilt is a clearance hole for the M4x0.7 cap screw (or #8-32 for the Americans) which will mount your 1/2" lens holder to the RC1. The size standard for cap screws dictates shoulder diameter as 4 mm maximum. A good quality cap screw is going to have a real world major diameter measured at the thread of ~ 3.90 to 3.95 mm. The standard diameter for a close fit clearance hole is 4.2 mm so you would go best with the 4.25 mm diameter. 4.1 mm might work for a short cap screw, long screws can bind in the hole, but you'll need some "slop" in the fit to allow you room to move/tweek the 1/2" lens, in its holder, concentric and perpendicular to the beam axis.</div><div><br></div><div>You should note: just screwed together and mounted on the table it is very unlikely your lens will be on the same axis as all of the parts purchased and custom manufactured by "you" will have fit tolerances and error including the concentricity of the Thorlabs doublet lens to the lens holder it's mounted in. Careful parts and sub-assembly matching will go a long way in tuning your build.</div><div><br></div><div>For what it's worth: contrary to a common held belief, screws don't locate anything - they simply hold things down. Dowel pins or surfaces locate items. The part designer here is co-oping the close fit between the cap screw thread and the stilt hole it passes through in order to use the cap screw as a poor man's dowel rod. This was very likely done as a cost consideration as it's an inexpensive solution.<br></div><div><br></div><div>Best of luck with your build. </div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><span style="font-size:12.8px">- David</span><br></div><div><br></div><div><font size="1">David Potter</font></div><div><font size="1">Lattice Light Sheet Microscopy Manager</font></div><div><font size="1">Monash Micro Imaging - Advanced Optical Microscopy</font></div><div><font size="1">Monash University Clayton, VIC 3800, Australia</font></div><div><br></div><div><br></div></div></div></div></div></div>
<br><div class="gmail_quote">On 20 December 2016 at 05:00, <span dir="ltr"><<a href="mailto:openspim-request@openspim.org" target="_blank">openspim-request@openspim.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send OpenSPIM mailing list submissions to<br>
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Today's Topics:<br>
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1. Files for parts on OpenSPIM Wiki (Kathleen Chen)<br>
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<br>
Message: 1<br>
Date: Mon, 19 Dec 2016 11:20:34 -0500<br>
From: Kathleen Chen <<a href="mailto:chens18@rpi.edu">chens18@rpi.edu</a>><br>
To: <a href="mailto:openspim@openspim.org">openspim@openspim.org</a><br>
Subject: [OpenSPIM] Files for parts on OpenSPIM Wiki<br>
Message-ID:<br>
<<a href="mailto:CAGv7iOhrJzyAoVRkdnNdfnCoVo2e-8xoQC89dsFCd-dQLNW_1g@mail.gmail.com">CAGv7iOhrJzyAoVRkdnNdfnCoVo2e<wbr>-8xoQC89dsFCd-dQLNW_1g@mail.<wbr>gmail.com</a>><br>
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<br>
Hello,<br>
<br>
My name is Kathleen Chen and I am a graduate student researcher at<br>
Rensselaer Polytechnic Institute. My lab group is interested in building an<br>
OpenSPIM according to the specifications provided on the OpenSPIM Wiki.<br>
<br>
I have recently been looking at the parts list for the OpenSPIM website, in<br>
particular the "self-made" parts. I noticed that there are some<br>
inconsistencies between the PDF version and the STL/STEP files for two<br>
parts: "RC1 vertical slit stilt" and "RC1 Ø1/2" lens stilt."<br>
<br>
Specifically, the measurements in the files are different. For example, the<br>
inner diameter of the slit stilt is 4.1mm on the PDF drawing, but the<br>
STEP/STL files show the inner diameter to be 4.25mm. Which measurement is<br>
the correct one to follow for the manufacturing process?<br>
<br>
Thank you,<br>
Kathleen Chen<br>
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