Option 1: Tube-Fitted
altitude bearings: For tube telescopes - Dobsonian,
Newtonian or SCT. This choice allows you to "Dob"
your equatorially mounted newtonian or SCT
using your existing rings. Braces on backs of the bearings
are cut to fit outside diameter of tube. Attach with
3/8" bolt through a center hole in the bearing.
Custom made to any size up to 23" bearinig diameter.
Option 2" Large
Flat sided altitude bearings: Fit flat against square
or rectangular mirror boxes, typically for 12 inch or
Option 3: New
you have 5" or 5.5" small factory installed
bearings, the Big Bearings Upgrade provides a "drop
in" replacement with a 12" bearing surface.
Smoother motion, finer control and greatly improved
balance. Requires a drill and Phillips screwdriver.
Small bearings with
a lip are up to 11.875"diameter with 11.5" bearing
surface - as shown above. Without a lip, up to 12"
Large bearings are over 12" to 23".
Fitted bearing supports are CNC cut to precisely fit the
outside diameter of your tube.
Aavailable as a kit or
assembled and finished:
Altitude Bearings: Arrive ready to use.
Bearing Kits: All
parts included. Wooden parts are rough sanded, and pre-drilled.
You'll need: Philips screwdriver, sand paper, wood glue,
contact cement or spray adhesive.
CNC cut 3/4" Baltic Birch plywood, FRP strips cut
to fit with finish screws to attach, #12 steel wood screws.
Finished bearings have up to eight coats of fine sprayed
polymer sealer with an cinnamon (reddish) tint.