How do I keep the speed of my router down? I have tried two different routers, one with built in speed control and one with external. The bit is a large raised door panel. With both systems the bit comes up to speed nicely, and then as I pass the work in the bit will bog down a little and then go way - way faster than it was at free rpm. I about ran from the room a couple times thinking the bit was going to fly apart. This canít be safe and I have almost given up on raised panel doors at this point.
(Solid Wood Machining Forum)
From contributor P:
Raised panels on a router? Run now before you get hurt. Don't even think about doing this. Get a shaper, at least 3/4" but better if larger or buy the doors from somebody who has the knowledge and tools to make them safely. Shame on whoever led you down this path!
It really requires quite a lot of power and torque to rotate those large diameter raised panel bits. Because of their size, they need to run at a slower rpm. The difference between the sfpm tip speed and the cutting speed near the bearing is significant. This makes it even tougher to get consistent cuts, especially while hand feeding. Some of these nasty cutters are up to 3 1/2" in diameter with an undercutter as well. Cross grain cuts are the worst.
The cutting action itself along the surface face is more of a scraping cut and the router bit will become dull and compromised with your very first burn mark. I really don't think much of these router bits being sold and utilized in any available hand-held router or small router table set-up. They have neither the hp nor bearings for the task. The whole operation can be very dangerous without automatic feeds and enclosed cutter head set-ups. I have big old pin routers that can handle these airplane propeller bits but I still don't feel safe even standing in front of them. Those vertical raised panel bits make more sense as long as you aren't cutting any radius panels. What makes even more sense is to order your cabinet doors from the big factory and save time, money and your fingers.