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 the.traveller
20 Jul 2011, 13:04
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 25484

Re: Fix Keystoning via hardware adjustments

Thank you dpc for the formula.
Now with the help from the website Jack showed us I have a better understanding of what I have to do, using which formula.
by the.traveller
20 Jul 2011, 12:00
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 25484

Re: Fix Keystoning via hardware adjustments

http://www.diybookscanner.org/forum/download/file.php?id=2999 BTW, your example of the 30 degree right triangle is easy because the hypotenuse is twice the length of the side opposite the 30 degree angle. hannah montana - say what.jpg Let me chew a moment on that. BC = 30° c = 12 of which a = c/2 ...
by the.traveller
20 Jul 2011, 11:00
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 25484

Re: Fix Keystoning via hardware adjustments

For me it is mind dazzling. This site has an easy triangle calculator. Just put in the variables you know: http://www.csgnetwork.com/righttricalc.html Yes this does it, thank you very much for this tip. Pity they don't show the intermediate steps at his site? Seeing the intermediate steps I can fol...
by the.traveller
20 Jul 2011, 06:00
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 25484

Re: Fix Keystoning via hardware adjustments

For me it is mind dazzling. Can we go a few steps back and forget the radians. A circle is 360°. If we place an unequal triangle in it. It will look like this Goniometric circle. Goniometrische-cirkel-sin-cos.png I want to calculate the dashed line on the right and the red part of the cosinus line....
by the.traveller
19 Jul 2011, 21:19
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 25484

Re: Fix Keystoning via hardware adjustments

Postby rob » Yesterday, 21:49 You were using radians when you have to use degrees. Not sure how to set degrees in Excel, though. Use the Excel function RADIANS to convert a value in degrees to radians. sine of BC (30 deg) should be 0.5. cosine of BC should be 0.8660254 Gentlemen, this is again pro...
by the.traveller
19 Jul 2011, 12:35
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 25484

Re: Fix Keystoning via hardware adjustments

If you have a right triangle and know the length of one side and one of the other angles, you can find the length of the other sides using sine and cosine functions. Given a right triangle with sides a, b, and c, with c being the hypotenuse, and BC being the angle formed by sides b and c: a = sin(B...
by the.traveller
16 Jul 2011, 12:13
Forum: Scanners and Build Threads
Topic: Scan Comic Books
Replies: 10
Views: 12793

Re: Scan Comic Books

I found the v.100j firmware on the shdk site but I did not find instructions on how to put it on my camera. I will try to put the SDM software on the old firmware. Maybe it will work. Mind you SDM is not ment to replace your original firmware. SDM is placed onto a SD card and then placed into your ...
by the.traveller
16 Jul 2011, 11:28
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 25484

Re: Fix Keystoning via hardware adjustments

Thanks to Spamsickle who provided a calculation for a standard scanner which has a 90 degree cradle. I now can calculate how the cradle will look like. And from there the total size of the base. See our discussion at Science! Or, a new page on the wiki for technical works I made a spreadsheet with c...
by the.traveller
16 Jul 2011, 10:43
Forum: Help with this site
Topic: Science! Or, a new page on the wiki for technical works
Replies: 3
Views: 16390

Re: Science! Or, a new page on the wiki for technical works

I have to say, though, that this seems to be going about it backwards. I've always begun with the size of the books I wanted to scan, and matched the sides of the cradle to that. Spamsickle, thank you for explaining. Exactly what I am trying to do. Lets have a look to one of the pictures from dpc h...
by the.traveller
16 Jul 2011, 10:32
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 25484

Re: Fix Keystoning via hardware adjustments

If you know the length (L) of the green line segment between the red and yellow camera direction vectors in the diagram below, then the vertical distance between those two lines (i.e. the amount you'll need to translate the camera) is simply L / cos(cradle_angle / 2). (The cradle_angle of the stand...