Router Woodworking

Precision Subbase

The subbase for critical operations requiring precision collar/cutter centricity.

My subbase, with its machined ring and pin, can be centered precisely to the router collet*.

As such, expect repeatability and on-target routing with dovetail & box joint jigs, in-lay kits & precision templets.

The subbase is centered with a .500" ground steel pin in the collet & a machined ring (both supplied) snapped into the subbase collar counter bore (2). The ring/pin fit is instantaneous, positive and unambiguous. Screw down the plate and you're ready to rout.

The footprint (7") of my subbase is larger (1) than any router casting in North America except the Bosch 1619. And at 9mm (~.350), the plate is thicker than any OEM base plate and less likely to deflect or break. As such, expect more control & stability, especially on the extremes of the substrate. Drop the router and the oversized plate is sure to hit the deck first and save the rest of your router from the impact. Moreover, there is >.250" of plastic under the head of the subbase screws. You can't drive the screws though the counter bore.

Precision Subbase

Precision Subbase

Precision Subbase

The special screws** reside in oversized counter bores. The head and shank of the screws have ~.045" swim room. As such, the plate will center itself on the worst of third world castings. Rated at 145,000 psi (min.) tensile strength, not only will you not break off the head of the screw, you will not spoil its socket.

Though the diameter & thickness of this precision base is the same for all routers, the subbase screw holes & circles are unique for each machine. There are no extra screw holes in it to clog with chip or frustrate your view of the work. The product is completely machined (sized, drilled, counter bored, reamed, chamfered, & polished) and ready for work. And each plate is supplied with a precision centering ring and ground .500" steel dowel.

I make the plate & rings here in the United States of America.


1) The oversized (.350" x 7.0") plate is counter bored & dished for your collar guides. The screw holes are also counter bored and chamfered; expect ~.045" of swim room for the screws. The cushioned wrench is supplied.

2) Here on a Porter Cable 690 casting, the ring and pin are conspicuous. The screw heads reside ~.010" below the face of the plate.

3) Neoprene, plier's jaw protectors (4 supplied) keep you from dingin' your guide bushes.

4) Note how the collar flange sits below (~.010") the face of the plate. My plates are templet ready; they'll require no re-machining.

5) See New Pix/Product page for enlargement.

* The centeredness of the subbase cutter hole counter bore to your collet should be ~ + or - .001". Nonetheless, errors can occur and accumulate on occasion. For example, if your collar (PC/DW type only) flange is out of the Porter Cable (1.373'-1.375") specification it may swim in the plate counter bore producing some eccentricity. Moreover, all collars are not created equal. Some are poorly made. Machine errors do occur in the extensions (the boss that slides against your templet). Some are out of round, others eccentric to the flange. Still, others may have been crushed on installation or removal. Yours may be worn. The point: My system is very likely to be your best shot at collar/cutter centricity but there are instances, out of our control (albeit rare), that may frustrate perfection.

**Flanged button head, low-profile, hex-socket, steel cap screws.


(Email please)

1) Product Kit: $63. Includes subbase, screws, precision pin & ring, 1 neoprene wrench sleeve (not shown), 4 pliers tip protectors, 1 cushioned T-Allen key, and instructions.

2) Subbase with screws only: $36.

10% discount on second plate or kit.

3) Dictate: Router make/model, include shipping address, kit or 1 base plate (option 2).

4) For the following routers: PC 890/690 series, PC7/8529, DW 618/616/PKs series, DW 621 & DW 625 (7.6" diameter), Milwaukee all (excepting 5625), Makita 1100 series, Makita RT0701C, Bosch 1617/18, PR011, PR-20, 1613 & 1166 (6.75") and 23, Festool OF 1400 EQ, DNP612 (DW611 plunge casting), Triton (2 & 3 HP), & DW 610 (6").

Yours not listed? Requests considered.


Material: Acrylic

Dimensions: ~9mm (~.350") x 7.0" diameter

Weight: ~250 Gms (~0.5 lbs)

Loss of depth/cutter reach compared to standard .25" subbases: ~0.10"

Collar flange counter bore: 1.375" - 1.378" x 0.105" min.

Home  |  7310 Subbases  |  Beveled Straight Edge  |  DW 611  |  Edge Guides  |  Lessons/Consulting  |  Machining Plastics  |  Mortiser  |  Morticing with a Router  |  New Pix/Product  |  Offset Sub-base  |  PR-20 Sub-base  |  Precision Subbase Kit  |  Replacement Rounds  |  Router Encounter PDF  |  Router Table PDF  |  Routing Outing PDF  |  Routing for Starters PDF  |  Right Angle Templet  |  Router Table Fence  |  Routing to .001"  |  Sale  |  Selecting a Router  |  Straight Edges  |  Tee Square  |  Vertical Trim Subbase

Copyright © 2014-2016 Pat Warner
Last modified: Sun Sep 18 10:33:17 PDT 2016