Why is the maximum speed for a 45 degree lock mitre router bit 18,000 rpm? I got this Amana Tool bit for my birthday and do not have a variable speed router. Mine is an older Porter Cable with 23,000 fixed rpm. Thank you for your help.
- Karen
Des Moines, IA
Our Expert
Maximum speed limits on router bits are for your personal safety.
Over the past twenty years there has been a dramatic increase in the variety of router bit profiles. As a result, you can now shape large profiles with a router that once required an expensive shaper. However, large diameter bits have a much higher rim speed than smaller bits when run at the same RPM. Although the basic concept of the router has not changed since its inception, today's routers have several features that older machines lack, such as soft start and variable speed, which enable them to safely spin large diameter bits. Also, keep in mind that many bits, such as the lock miter bit, are limited to use in a table-mounted router and should never be used in a hand-held router. This is also for your safety.
By purchasing a large variable speed router and mounting it in a table with a fence, you'll have, in effect, a small versatile shaper which will allow you to shape raised panels for doors (Amana Tool no.54117), create both curved and straight moldings(Amana Tool no.54260), and make complex joints such as the lock miter (Amana Tool no.55390).
