Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ

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by wmalcolmk
15 Jun 2015, 10:39
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

First Test Photos duerig asked for sample scans. These cannot be regarded as more than first tests to find out what needs attention. They have had some manipulation in the computer in order to reduce file size mainly. I am using cool LED arrays, since I am concentrating on black and white reproduct...
by wmalcolmk
15 Jun 2015, 06:00
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

Marcus asked the question.. In builds where the platen drops into the book, the cradle typically adjusts to accomodate the width of the book. Is this not necessary in this case? Answer - Yes, it is necessary that the book is adjusted sideways as the pages are turned. In this case it is done by slidi...
by wmalcolmk
14 Jun 2015, 12:37
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

Footsie Photos Here at last are photos of the complete structure, including screening from overhead lighting in the room, and support for the book lamp. Footsie1.JPG The overall height is 1.55 metres, and width and depth are 0.6 metres (excluding foot pedal). The operator pushes down the foot pedal...
by wmalcolmk
13 Jun 2015, 04:53
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

Marcus asked how to make a book cradle with a centre section that conforms to the shape of the book spine. The photo below shows my cradle resting upside down on a flat surface. It was made from two plywood sheets, size 250x170x5mm, and two mdf strips 170mmx5x3mm. Hold them together using sticky bac...
by wmalcolmk
12 Jun 2015, 04:08
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

I've just been reading a US Department of Energy report on CRI.. http://cool.conservation-us.org/byorg/us-doe/color_rendering_index.pdf I'm not too sure that CRI is too important, since it is used to assess how things look by eye when a lamp illuminates an object. When a lamp is used in a scanner th...
by wmalcolmk
10 Jun 2015, 07:24
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

Reflections and Trigonometry When I built my first scanner, I worked out the position of the lamp by trial and error. However, it should be possible to calculate this, and at the same time gain a better insight into how camera position and glass reflections influence performance. This diagram shows...
by wmalcolmk
03 Jun 2015, 09:14
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

Footsie Photos Here are a few photos of my latest version of Footsie - the one legged/sitting down/foot operated/book scanner. As you can see from this first shot, it is designed to be clamped to a table at the rear of the scanner. In this case I used a workmate, (that's the name in England. I'm no...
by wmalcolmk
30 May 2015, 06:13
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

Foot Pedal and more Pulleys ndavidow asked for more information on the foot pedal. This design has two ropes which run downwards on either side of the platen. They need to be pulled downwards in order to raise the cradle holding the book. The latest configuration uses further pulleys underneath the...
by wmalcolmk
28 May 2015, 10:22
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

Cradle, Pulleys, and Rope I will try to explain how raising the book with a rope around the cradle gives an easy way to compensate for thick books. The cradle should be thought of as a help in raising the book by hand. The hand guides the book onto the platen, and the cradle does the hard lifting w...
by wmalcolmk
24 May 2015, 10:18
Forum: Scanners and Build Threads
Topic: Footsie Bookscanner
Replies: 41
Views: 25509

Re: Footsie Bookscanner

I've now worked out how to upload photos to the site. So here are two that best explain how it is possible to design a scanner that keeps the platen in a fixed position, and move the book upto the glass of the platen. The prototype was produced over a year ago, and is documented on the Instructables...