Use a fosner bit up till about 3". Then a hole saw bits an a drill press or
hand drill for the bigger holes.

"Ignoramus19901" wrote in message
...
I have a need to make neat round holes in plywood, from 1.75 to maybe 5-6
inches in diameter. That's not for a woodworking project, it is to
make guides for plasma cutting.

I have a relatively nice Ryobi scroll saw that uses pinned blades.

What I found out was that making sure that the curvature of the cut
was constant, was kind of difficult.

I would like to know if there are any "secrets" of scroll saw cutting,
that I am neglecting.

My feeling is that I should look for a blade that is not as "deep"
(deep meaning dimension along the line that is being cut, can be also
thought of as width of the blade).

Any other suggestions will be gratefully accepted.

thanks

i