Professional scroll saws cut just fine. They raise the blade vertically
and pull it down vertically. Most are 'donkey' slant saw blade actions.

The jigsaw blades are just not long enough and tough enough for 4".

Martin

On 10/16/2015 6:14 PM, John McCoy wrote:
John Doe wrote in news:mvrptu$ov0$2@dont-
email.me:

From everything I read... My problem with a scroll saw is they cannot
cut straight. Don't know why, considering a jigsaw can cut reasonably
straight. I guess none of the blades are deep/wide enough? But that
doesn't make sense.

Well, since a scroll saw is designed to cut curves, perhaps
it's not surprising they don't cut straight.

My guess would be that the very thin blades cannot be tensioned
enough to avoid flex. Even a thin bandsaw blade is much larger
than a scroll saw blade, and a bandsaw frame is vastly stiffer
than a scroll saw frame.

John