Dobsonian mounts
Mount information & help
Mount add-ons
Amateur telescope making
Primary mirror cells & masks
Alt. bearings & rings
Contact & ordering
 
Amateur telescope making

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Click here for example 1.5" ring width.

Azimuth Bearing Laminate.

Black Formica laminate Crystal 42
Adhere with contact cement.

Rings:
Size
Price
OD up to 23.4": $40
OD up to 19.5": $27
OD up to 16.5": $21
Outside Diameter (OD). Thickness
up to 1.5"
Solid Rounds:

No larger than OD.
Free
As available, with purchase of 1.25x1.25" Teflon azimuth pads. Round maximum size 16.5" OD. Shipping not included.

Thicker rings upon request.

Submit order




Altitude Bearing Laminate 48" Strips.

Black Formica laminate Crystal 42
Adhere using contact cement.

# of sets
Size (quantify)
Price
0.71"x48" (2)
$16
1.00"x48" (2)
$18
1.50"x48" (2)
$22
Width Quantity
Custom size over 1.50"x48"
(1/4" increments)
$4.00 per/inch width.
($25 min).

Submit order
 



Virgin Teflon (PTFE) Pads.

All Teflon 1/4" thickness.
Predrilled and countersunk.
#6 3/4" stainless steel flathead screws included.

# Of sets
(Qty) and size
Type
Price
(4) 0.71"x1.25"
Altitude pads.
$16
(4) 1.00"x1.25"
Altitude pads.
$17
(3) 1.25"x1.25"
Azimuth pads.
$17
(1) 2.50"x2.50"
Azimuth bolt pad (with laminate)
$23
Custom sizes: $4 per square inch (7 sq" minimum).
Contact us specifying Teflon to order.

Submit order


Let's fix this!

"I didn't like the lazy susan roller bearing. Your fix was just the ticket. Great fixes and improvements!"

- Johan F.


Apertura azimuth motion and stability fix
Mount
Ring O.D.
Price
AD6
16.0"
$32
AD8
18.5"
$38
AD10
21.5"
$50
AD12
23.3"
$50


What does this fix?

  • Fast motion: Instead get "buttery smooth" easy to control movement.
  • Finicky imprecise stops: Provides sure stops when releasing the tube.
  • Wobbling: OEM lazy Susan bearing is unsupported. We move weight directly over feet to transfer into solid ground.

How easy is this fix?

  • Glue laminate ring under mount round rocker box bottom board..
  • Screw 3 Teflon pads into ground board (round or triangular) over the feet.

Included: Laminate ring (glue with contact cement you provide), three 1.25" square 0.25" thick Teflon pads with six stainless steel screws.

Combined with Integrated EZ manual setting circles

Submit order



ATM Azimuth Setting Circle kit
Align in 10 seconds!
$75 plus shipping.
Quick and easy installation.
 Enter ground or rocker box bottom board diameter here:

  • One piece circles for maximum rocker box round bottom board OD of 20.9".
  • Assemblable to solid circle sections (3 or 4) for rocker box bottom boards over 20.9".
  • Setting circles fit under rocker box, between its bottom board and mount's ground board.
  • Rotates freely, locks in place with turn of small Nylon bolt.
  • Stainless steel pointer.

    Azimuth setting circles extend 1" outside rocker box's bottom board with 0.25" captive under. Three included Teflon pads install inside the circle's inner edge to keep centered and provide smooth secure rotation. Laminate ring glues under rocker box board, rides on Teflon pads.

    To use:     Point telescope at north star. Rotate circle to 0 demarcation with pointer, turn nylon locking bolt to secure circle position.

    Includes:     6mm birch plywood setting circle with increments/degrees laser inscribed, stainless steel pointer, 3 Teflon pads, 6 stainless steel screws, laminate ring, locking bolt assembly.

    Installation instructions:
  • Fine sand circle and finish with clear coat.
  • Remove telescope ground board. Measure 1/4" inside from edge and mark with black felt pen in three places (at approximately 120) on facing sides of both rocker round and ground boards.
  • Lay setting circle onto rocker box round board using marks. With pen draw circle along inside edge. This will provide perimeter for gluing laminate. Glue on laminate (contact cement).
  • Center and secure setting circle on the ground board using marks. Place three Teflon pads in line with feet just touching inside edge of circle then screw into ground board one at a time..
  • Using a 1/4" bit drill 1" into center of rocker box round board edge. Hammer lightly in to 1/2".
  • With setting circle on ground board, bolt to rocker box just tightly enough to rotate freely.
  • Screw lock in under ground board so elevated washer on plastic bolt slips just over circle.
  • Easy to do!

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Lining material for clamshell rings.

Adhesive backed cork-rubber:

Length in feet
Thickness
Width
Price per foot
1/32"
1/2"
$1.50
1/16"
1/2"
$1.75
1/8"
1/2"
$3.00
1/8"
3/4"
$3.50

Submit order

Please include all ATM items desired before submitting your order. 

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