Porter Cable 690

[cbreitzman]

I have been using a Porter-Cable 690 in my CNC machine for about 1 year. I replaced the brushes a few months ago and am finding the router is running much slower, around 9000rpm's as compared to a new one at 23000. I then put my spare on and now that one is running slow as well. I have been using a router speed control on both routers and am wondering if that may have caused an issue. Does anyone out there have a router that is best suited for this application? I'm willing to switch to another brand if someone has a recommendation.

thanks

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[ger21]

Are you sure it's not the speed control? I've never seen a 690 not run at the rated speed. And I worked in a shop that had about 40 of them, abused daily for 15 years. The only problems I've ever seen were bad switches and cords.

A 690 should run at 27,000 rpm, btw.

I use a Super-PID on mine to control the RPM, and have accurate rpm control from 5000 to the full 27,000.

[cbreitzman]

I was using the speed control, when I noticed the router getting slower I disconnected it from the speed control and it turns at 9300. The second router did the same thing.

[ger21]

Sounds like the speed control could have somehow damaged it? I don't know enough to know if that's possible, but the fact that it's happened twice would point in that direction.

Have you checked the voltage where it's plugged in?

[bill south]

Two routers, same problem. Check the supply voltage or plug the router into a known good outlet!
Good luck.
Bill

[CarveOne]

If this is a regular router speed control box I would suspect that first. Plug the routers directly into a known good wall outlet as Bill South suggested.

CarveOne