Ive tried a couple of different PDF to DWG converters. The best one I found was PDF2DWG. None of them are foolproof and you will still need to do some tweaking of the resulting file.
The problem many people have is understanding that conversions only work on PDFs created from a vector image (like a CAD drawing). PDF's from scanned images or created by a raster image progame do not convert.
I know this is a relatively old thread, and seems to be resolved, but I thought I would add a little to it.
Adobe Illustrator does a great job for converting PDF to DWG. Illustrator will import PDF and export DWG. The PDF can be manipulated within Illustrator and output at any scale. I've had excellent success with Vector images. One thing that Illustrator can do that I don't think any of the conversion-only programs can do is trace raster images. I've had varying success with this, and usually requires a good deal of hands on manipulation, but this functionality has come in handy on several occasions. It is especially usefull for things that don't have to be in scale, like logos and details.
Illustrator is a deep program with a steep learning curve, but if you or someone you work with has it, give it a try.
I have used few PDF to Dwg converter software's. aidecad and pdf2dwg
both works fine but still we have to touch up drawings, its not 100% perfect i believe there is no sotware that make 100% straight line , circles and text, but still this software's help to save your 80% time to redraw. so i like this software's.
Hope this help.
I was hunting around all day today looking at different PDF to CAD viewers. Going to buy one of these is an option, but the VectPDF open source project works just perfectly for this. It is about 14MB and works right in autoCAD and doesn't cost a thing.
It loses the scaling on import, so you need to re-scale the drawing. It also loses some of the connection points in arc or circles, but it tracks the lines perfectly and only needs a couple clean ups.
Try this tool out before trying one of the expense ones:
Corel Draw 5 lets you save to dwg or dwf. I have used it to convert pdfs of municipal road maps to dwgs. It typical turns everything into splines with A LOT of points which can be good or bad.
I tried some 3rd party softwares for conversion too. My experience wasn't good with those.. Pdf to cad converted file doesn't aloow me to edit texts, multileader and hatch objects..All of them was vectors. And as one of user wrote some part of drawing turned back as a raster image.. my idea for best result complex drawing files (or for all scanned hard copies) Re-draw method.. Or find some guys like <a href="www.convertpdftoautocad.ca">convertpdftoautocad.ca </a> to do that for us.. I also strongly believe if any way %100 percent conversion possible for sure Autodesk add that command to Autocad.. Autodesk is the best.. If we haven't got that option on our sofware it means for me no way to do it