Ok, I know this is the wrong way to do this, but its much cheaper than buying an electronically controlled Router Speed Controller.
This will require some significant fitting. (filing)... that little knob is a pain to measure.
Made for a RSC-9400, controlling a DW660, controlled by Marlin, on an MPCNC.
To control, just add appropriate M280 G-code commands where needed.. IE:
MAX SPEED: M280 P0 S0 (assuming that the servo is plugged into the first port (P0))
MIN SPEED: M280 P0 S180
With a bit of creative programming, and a Hall Effect sensor, you can get Marlin to maintain the DW660 RPM pretty accurately, even when cutting (no more stalls!)
I have done several spinup tests with this, and it has held together extremely well for ~10 hours. Make sure you have a fan on your speed controller, that back plate gets toasty.
HARDWARE Required: 2x ~7mm M3 screws with normal nuts. the 3mm holes on the dial adapter are on 17mm centers; you will most likely have to drill holes in the servo bracket for M3 screws to fit.
If you don't have this exact servo, the OpenSCAD file is included; make the one in there match yours.
EDIT: Uploaded 2 new files ending in MK2. These files have not been printed or tested yet. I changed several small things, including:
- Added a screw plate under the one side of the servo, so I'd stop poking fingers on the ends of the self tapping screws from the servo
- made the ID of the knob adapter about 1mm bigger, less filing to make it fit
- added nubs on the knob adapter, so you can spin it by hand when the servo is disabled, broken, or the software can't get the setting right.
There is basically no force on this mount; it's sole purpose in life is to hold a servo at the proper location to turn a knob;
As long as it can support a 1/2oz servo, you could print this thing out of frosting.