Need Help! RAS2VEC CHOOK SCALES DOWN JPEG. WHY - CNCzone.com-The Largest Machinist Community on the net!

metlshpr · #1 03-31-2011, 10:24 AM

Im trying to take a pdf file that has a part drawn on it to scale. So what I want to do is make it a dxf for my waterjet. Heres what I did: printed out pdf, scanned to jpeg, used chook (ras2vec), measured my 5/8 hole in the part, now it is .011. My ? is why did it scale down my part. I then used a pdf to jpeg converter so as not to use scanning software, same result. Can anyone help me with this one?
Thanks in advance.

bundysax · #2 03-31-2011, 08:18 PM

Good question, I scanned some wing ribs for an airplane that I am building and the scale was off so much I just traced the copys and cut it out by hand

metlshpr · #3 04-01-2011, 08:15 AM

So....Does anyone know how to fix this problem?

cadcam · #4 04-07-2011, 10:20 PM

The jpeg compression changes the size so it will not scan to size. so scan measure a feature and scale to correct size.

metlshpr · #5 04-08-2011, 08:46 AM

Thanks I'll give it a try.

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