Mirror Cells - in stock.
Top view of Universal Mirror Cell
This cell takes either
conical mirrors from 8" to 13.1". The
front plate fits the back of up to a 12.5" conical
Comes with three adjustable
tube supports. Three extra tube supports
are optional - for six total. Optional mirror
clip sets are completely adjustable.
Perfect replacement for the Orion XT series Dobsonian
- solves the problem of collimation bolts backing all
the way out, requiring difficult reassembly.
Mirror Cell materials and specifications.
Mirror Cell fits a minimum 8-3/8" interior
dimension tube. Two 1/2" Baltic Birch plywood plates
contain 2-1/4" hex head bolts held securely in
the top plate. Washers under the top plate cap heavy
duty flat ended springs that ride on the bolts between
the top and bottom plates. Bottom of springs are captured
in wells in the top of the bottom plates. Bolts pass
through bottom plate, washers and contained by the collimating
knobs. The tube supports are 1/8" aluminum, which
can also be used as mirror clip assemblies. Wooden parts
painted flat black.
||2.75" from back
of collimation knobs - can be made 0.375" (see
||Uses 1/4-20 screws
- three available positions - see
forward of the rear plate.
back of the rear plate.
back of the rear plate.
Mirror Clip Set adds 0.1 lb.
Standard 8", 10" and 12.5" Mirror Cells
Top view of standard mirror cell.
of standard mirror cell.
6" Mirror Cells -
Top view of 6" mirror cell.
Bottom view of 6" mirror
can design and manufacture the rear
cell plate to a specfic tube diameter
for precise fitting. Check the appropriate
box on the form after ordering.
Adds $50 to price.
8", 10" and 12.5" Mirror Cells:
What does "optimized" mean?
Each cell we ship has your mirror's support
placement calculated using the program PLOP
to obtain the best results for your primary
mirror. We collect the necessary information
(mirror diameter, thickness, focal length, secondary
size) to do this calculation on a form after
your order is placed.
Materials and construction specifics:
and bottom cell plates: are very rigid 3/4"
Baltic Birch plywood.
3/8" x 2-1/2" hex bolts are captured
in the top plate. Bolts pass through top plate,
then through washers located under the top plate.
Heavy duty flat ended springs go over the bolts
against the washers. The springs are captured
in machined wells in the top of the bottom plate.
Bottom of the cell plate has three washers over
the ends of the bolts, all captured by three
The spoke ends of the bottom plate are drilled
transversally to take 1/4" bolts for mounting
to your tube. Cutouts in the spoke ends are
for lock nuts to secure the mounting bolts.
cells have three indexing marks on the top plate
that we use for positioning adhesive backed
felt pads at the calculated optimal positions
to support your mirror. 8",
10" and 12.5" cells have three
pivoting arms attached through the sides of
the top plate with 1/4-20 bolts. The top of
the three arms the height of the top plate.
Each arm has two raised rounded areas at their
ends which are extend 1/8" above the top
of the plate. An adhesive backed felt pad is
then placed at the calculated optimal position
for your mirror.
clips: are individually cut to be 1/8"
above the surface of your mirror and extend
1/4" to have 1/8" over the mirror
surface with an adhesive felt dot underneath.
1/8" of the clip's vertical shaft extends
over the top plate locking it so there is no
sideways tipping. The clip is secured though
its bottom outside surface to the top plate
with removable countersunk #12 screws into the
ends of the plate's spokes.
Removing one mirror clip allows access to the
Mirror clips allow 1/4" overall space around
the mirror. Use thin adhesive backed felt dots
for less room around the mirror.
plywood is very rigid. Cutouts in the 8",
10" and 12.5" cells are designed to
minimize weight and allow maximum ventilation.
All cells are drilled to attach a fan. Cells
measure 2-1/2" from the front of the mirror
plate to rear of the back plate. Collimation
knobs extend 15/16" beyond the back place.
Mounting bolt holes are 0.354" forward
of the rear of the back plate.
cells can be custom designed to fit inside rectangular
mirror boxes. Larger mirror cells upon request.
are always working on improving our products;
above information is subject to change without