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For lead screw number 2, a further thread has been added, which is shown with the green illustration. This means that with one revolution of the lead screw the two-fold stroke is achieved (lead = 2 x pitch). The start of the thread is offset by 180°, i.e. opposite each other. This is classed as multi-start threads, or sometimes referred to as a two-start thread.

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Lead screws are machine elements that convert a rotary movement into linear travel. Lead screws consist of a cylindrical round thread on which a single helix spirals the continuous length, transforming it into a screw. The threads can have, for example, the trapezoidal thread form, metric thread form or the dryspin® geometry designed by igus®. The dryspin® thread is similar in structure to a high helix thread.

I wrote Loupe to support my own workflow and make me more productive; I'm sharing it so people with similar interests can also benefit. Loupe is deliberately simple and minimalistic and there are many things it doesn't do yet.

If you need further information on an of our leadscrews, please visit the website https://www.igus.co.uk/info/lead-screw-units-lead-screw-units or speak to one of our experts on 01604 677240.

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Why does the Windows 8 FolderPicker make me click "OK" after I've already clicked "Choose this folder"? I have no idea. Unfortunately, there doesn't seem to be a way to avoid it; the official sample has the very same behavior.

Loupe doesn't collect any information about you, the images you view, or anything else! No data ever leaves the machine unless you use the Share charm, in which case only the images and captions you've selected are shared with the program you choose.

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The lead screw on the left (number 1) shows a single start lead screw. You can identify this by having one single thread. This is what is referred to as a single start. This means that the distance between the flanks, marked by pitch, is also the linear travel (lead) in millimetres per revolution of the lead screw.

Digital cameras are so fast and easy that a single photo shoot can generate lots of similar images. Going through all those pictures to find your favorites is a lot of work unless you have a tool that's quick and efficient and makes it easy to review your images...

Finally, the third lead screw in this example shows a four-start lead screw. This means we have 4 thread starts indicated by orange, green, purple and blue. For the linear travel the same calculation applies here as for the other examples.  The linear travel (lead) is therefore four times the distance between the flanks. The start of the thread is at a position of 90° to each other.

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Why does my caption disappear when I deselect a photo? Captions are stored in Favorites.txt as part of the selection list; if an image isn't selected, its caption won't be saved. But if you've accidentally deselected a captioned image and want to get the caption back, just re-select the image and the caption will be restored automatically!

Deciding whether to use multi-start threads or single for your application is sometimes tricky, simply because there are advantages and disadvantages to both. For example, a single start trapezoidal thread will self-lock, whereas a multi-start thread will not. On the other hand, you can travel much faster with a multi-start thread.

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Are my image files ever modified by Loupe? Never! One of the golden rules of digital photography is to never modify the original version of an image. Almost anything you do to retouch an image loses some detail, so keeping the original copy makes it possible to start over with a different approach. EXIF metadata supports captioning images in-place, but Loupe doesn't do that because it changes the file. Instead, Loupe saves the list of favorite images and captions in a simple Favorites.txt file alongside the images in each folder, thereby keeping the original images untouched and providing an open, easy way to track changes.

Multi-start thread or single? There are so many confusing terminologies surrounding lead screws, so let’s strip it down and get back to basics.

Our experts are on hand to offer application advice, to ensure that the best possible thread choice is used in your application.

What image formats are supported by Loupe? Loupe uses the operating system's Windows Imaging Component (WIC) infrastructure to decode images. By default on Windows 8, WIC includes support for JPEG, TIFF, GIF, PNG, BMP, ICO, and HD Photo images. The Microsoft Camera Codec Pack (installed automatically by Windows Update in most cases) adds support for raw images for most of the popular digital cameras made by Canon, Nikon, Sony, Olympus, etc.. Codecs are also available from third parties and can be downloaded and installed to provide support for additional image formats. To see which decoders are installed, check the About dialog.