Roto-Zip bits are 1/8" diameter and the cutting edge is about 1 1/2" long. They sell a 1/8-1/4" adapter for their use in routers with 1/4" collets. The bits are spiral for chip removal, so if you are cutting something that splinters easily they may not work well for you, but it's a possibility. Expect to break the bits often, but you can get double ended bits and their cost is quite low.
I used them in a Makita 1/4" router to cut 2' - 4' cartoon characters out of MDF and 1/4" plywood for my Daughter-In-Law to use at church. The material being cut was placed on top of a foam insulation board. Since the bits were down cutting, the foam board reduced chipping of the back side of the work and received most of the cuttings. Even at router speed, the bits don't cut very fast, so expect slow feeding and attempts to cut faster will only break more bits. Expect some side pull when cutting. Feeding slower reduces this pulling, but if cutting straight, a guide for the router will get you a straight line.
Central North Carolina
Last edited by CharleyL; 08-02-2017 at 08:42 AM.