Depending on whether or not you purchased the Z-Axis option (and you should have) it's still not quite perfect. In my case I'm using the Rigid R2202 router and the Z-Axis option for this model makes use of the existing adjustment knob which works good in theory but there's a lot of slop in it especially when changing direction (going between raise and lower functions).
Here are some things to improve the accuracy and reliability of the Z-Axis significantly.
Smooth and deburr router body and base. Clean, and wax.
- Disassemble the router body from the base (1). Clean the mating surfaces looking for any parts of metal-on-metal contact that may exist, file over if necessary. It may also benefit from working the mating surfaces with a maroon/red Scotch-Brite pad.
- Apply paste wax to the router body and the housing (1) where there would be metal-on-metal contact. This will help to ensure smooth movement. Instead of paste wax. Instead of paste wax, you may also use UHMW tape 3 lines 120deg from each other down the long axis of the router body. https://www.mcmaster.com/#76445A761
- With the Depth Interlock Lever (6) disengaged from the router body, and the collar handle closed (17) attempt to move the router up and down. If you can not do this while the handle is closed, slightly back out the adjustment screw (20) until it starts to move freely but is not sloppy. Then re-home the router and engage the worm gear latch (6)
Fix sloppy Z lead-screw assembly
- Obtain some suitable sleeve bearings these have a 0.5" ID and a 0.625" OD
- Remove the locking tab (8) and using a step drill, enlarge the hole of each side of the Depth Interlock Lever (6) to 0.635" (5/8") and about 1/8" deep on either side. Be sure to leave some material to act as a shoulder for the sleeve bearing.
- Insert the sleeve bearings on either side of the interlock lever, test for fit. Ultimately we will epoxy the sleeve bearings to the interlock lever (6).
- Once satisfied with the fit, and ensuring the locking tab will still work properly, degrease all parts and epoxy the sleeve bearings to the interlock lever. Be sure to remove the locking tab during this operation.
- Install some shim washers (1 worked perfect for me) between the router body and bottom of worm gear shaft (9). This should eliminate any up/down slop. You'll probably need a couple but it just depends on manufacturing quality at the time. The ID of the washer is 8mm OD probably isn't all that important but 13mm seems fine. Thickness will vary, which is why I used shim washers. You could also sand or file down a standard washer if you have one the right ID/OD.
Add some pre-load to the Z axis
I did this initially but I'm not running it this way currently. However this is something very simple like rubber bands or a bungee cord. Just need some tension on top of the router. I connected mine around the router base. Not pretty but it worked... I don't think you want a lot of tension here, just a little.