Precision CNC
Manufacturing
Home.
Customer comments with photos.
Dobsonian Mounts.
Which mount is best for you?
Standard solid.
 Custom solid.
Custom collapsible.
Dobsonian Mount Accessories.
Height adjustment stands.
Manual setting circle boards.
Digital Setting Circles.
Nexus II.
Sky Commander.
Teflon, Laminate & More.
Manual setting circle boards.
Bearing laminate.
Bearing teflon.
Mirror Cells.
Standard cells.
Premium cells.
Masks For Image Sharpening.
Visual: Correct for TDE/soft images.
Imaging: Remove star flare.
Aperture: Refactor sharp Newts.
Sharpening double stars in Dobs .
Bearings: Altitude and Azimuth.
Replacing small 5" bearings.
Standard 12" bearings.
Standard 18" bearings.
Custom bearings.
Altitude bearing guides.
Altitude bearing supports.
Clamshell And Rotating Rings.
For Dobsonian mounts.
  with rotating rings.*
For equatorial mounts.
  with rotating rings.*
Upcoming Items. Contact us for info.
Mirror box integrated cells.
Upper tube assembly rings.
Other.
Custom jobs / About us.
* Now available: Please inquire.
Altitude Bearings 

Altitude Bearing Centering Locking Captures
Now Standard On All Bearings.

Captures secure your OTA to the mount allowing centering on the mount, adding desired friction, or locking the altitude when changing eyepieces.

"I really like the nylon screws you have installed to lock the altitude motion of the mount. These are really helpful when changing from a heavy low power wide field eyepiece to a small light weight high power eyepiece. I use that feature a lot as it provides the necessary friction to keep the scope from shifting during an eyepiece change."
Dave C.  

12" Big Bearings.
5" factory bearings.

Small factory bearings are very underbalanced.
Fix with quick attach Big Bearings 12" upgrade.

Small factory bearings standard on many mass produced Dobsonian telescopes use clamps and springs to fix an inherent design flaw causing balance problems. 12" Big Bearings solve this issue, improving balance, motion, giving finer control, adding a lock mechanism for eyepiece change.

Every order is individually designed with hub hole size and spacing that fit onto your existing small bearings. Attach the Big Bearings to the existing small ones, install the side board supports under them, then remove the factory"Teflon" pads to complete the upgrade; a five minute job. Bearing Fine Tuning Guides are now included with Big Bearings to allow friction adjustment and keep bearings centered on the mount.

All parts included: bearings, supports, support screws, teflon, bearings laminate, fine tuning assembly. Requires glue for laminate (contact cement), Philips screwdriver and 3/4" longer bearings bolts.
Order:

Customized Big Bearing Kit
Factory kludge.
Standard 12" bearings with carrying handle cutouts, supports and guides.

Standard 12" and 18" Bearings.

Standard 12" and standard 18" altitude bearings with incised channels for fine tuning guides and sideboard supports. Both 12" and 18" designs incorporate cutouts to allow easy lifting and carrying of your telescope. Inside braces (shown on left bearing) are individually cut to precisely match your telescope tube outside diameter. Choose among these options:

  • With 3/8" center hole for bolting to you tube.
  • Holes to mount to your existing tube ring set.
  • No mounting holes (drill your own).
  • Curved bearing braces with matching bearing holes.
  • Fine tuning guides, channels and sideboard supports.
  • Other custom sizes upon request.
Order:

Carry handles are built in.
Standard 18" bearings


Bearing Guides (fine tuning)


Bearing Braces


Bearing Supports

Assorted Bearing Parts

Bearing Braces

Bearing braces attach to inside facing surface of your altitude bearings. Custom cut to your tube diameter. Kits only.

Bearing Supports

Bearing Supports are for 8" to over 23" diameter bearings, includes Teflon pads and screws. Specify diameter. Kits only.

Bearing Guides

Inside bearing facing side recessed 1/8" to not rub, and curved to match your sideboard cutout. 1/4-20 nylon screw tightens within inset threaded insert to desired friction in corresponding bearing channel. Kits only.

Order:
Assorted bearing parts come as unfinished kits. You fine sand and paint/finish. All holes in wooden parts and Teflon are predrilled and countersunk. #12 wood screws, #4 screws for Teflon, bearing laminate, nylon 1/4-20 screw and threaded wood inserts included. Wooden parts arrive rough sanded with 80 grit sandpaper.