Stgo Makerspace Book Scanner Build (standard)

[cstewart000]

Hello all,

I will be building a book scanner here at the Santiago Makerspace in Chile (http://stgomakerspace.com. I am going to document the project as I go . I haven´t fully researched every aspect of the scanner and taken the fools approach of rushing in.

Wood cut to managable sizes

As we dont have access to a large CNC router, I will be cutting the majority of the components on a crappy old little band saw. We are having someone in this afternoon to attempt to install and demo our now small 600x400mm CNC router.

New CNC

I am going to try to cut some of the smaller fiddley parts on that machine.

As I am doing the scanner on small machines it was necessary to cut up the plywood into more managable parts at the hardware store. I will attach a layout of the parts in a way which I thought was sensible to save material and break the sheet into managable sizes. If anyone else is building without a shopbot or mechmate, I hope this thread will be useful.

Saludos!

[daniel_reetz]

Really exciting work! Thank you for sharing it with us. I think your CNC will work OK, and your layout looks great.

edit: what software did you use to draft your layout?

[cstewart000]

Just AutoCAD and the built in PDF printer.

[cstewart000]

Today I bought the bearings and bolts. I got sent to a flea market full of gypsies and jugglers and old me selling older machinery. Here is the fruit of my labour.

bolts n bearins

Went down to the local printers today aswell and got the majority of the larger parts printed on 3 sheets of A0 paper.

Plans

I started cutting out the parts and gluing them onto the wood blanks for bandsaw cutting latter. gluing paper to wood for designs is not a great idea. I only did it because I saw Mattias Wandel do it once. (If you dont know who he is, he is best described as cross a cross between Chuck Norris and a Ninja but for woodworking. Things that you would never think of building with wood, he has built and probably 80 times better than you can. Check out his sites http://www.sentex.net/~mwandel/.

Back to the point. Glue is a bit messy and causes the paper to warp as you ar placing it. If you do use this technique;
1. Start in the middle of the piece and work outwards.
2. Use the glue sparingly.
3. Apply the glue to the wood and then place the paper on top.
4. Check some dimensions after.

I checked a few dimensions with the model and it doesnt seem too grave. However the print is not perfect 1:1 its 1:0.991

Plan glued to blank, you can see the warps in the paper.

Another technique is to use a clothes iron to transfer the plans onto the wood by reheating the ink on the paper. I am going to give this a shot next time. Its work well in the past. AND, you can usually get a couple of transfers from the same print. Just have to remember that the design is mirrored.

Cam

[cstewart000]

I built up the model in sketchup to get a better idea of how things go together. I will put the file below for those who may be interested. I have had a few issues drafting for the following resons>

Some of the lines in the dxf files are tool path lines that have been added where partial depth cuts/tenons are required.
There has also been some problems etween sketchup and AutoCAD identifying surface planes and circle geometry. The programs recognise these figures as a series of curves or segmented lines.

Looking at the sketchup model there are a few tenon joints I want to eliminate in favour of finger joints. I dont think tenons provide the same strength as finger joints and as I am cutting on a bandsaw single depth pieces are very attractive.

Below is a dodgy sketchup model. Some parts are not aligned properly. And others do not have rebates. As mentioned above I may change some of the joint styles. So I havent fully worked out all the bugs in the model.

[rob]

Adam Savage of the Mythbusters and probably one of the Gods of Makers says that he's a big advocate of "moving" -- just doing something even though it's probably wrong because you'll gain experience to make the next one right.

So fools might rush in, and makers might rush in, but that doesn't mean makers are fools

[cstewart000]

Yeah cheers for that. I would rather keep things moving and encounter problems and deal with them on the way then delay a project trying to be perfect and still have problems anyway.

Speaking of running into problems, the bandsaw blade I just got is 100mm too long. DOS METROS CUARENTA!!! I am sure I said it right. Anyone in chile need a 2.5 1/4'' bandsaw blade?