Introduction
The Black Box mount is designed to hold up to 3 scopes
at one time. For avid amateur astronomers who have more than one scope,
have a viewing partner or kids, this is the ideal mount. It would be a
good scope for teaching others about astronomy as you can have three people
viewing the same object at one time. It will work great at star parties.
This mount operates in a "drag and track" mode. You
move the optics to the object by hand, (each axis has "hands free" clutches),
you want to see with the Argo
Navis or Sky Commander. The mount then tracks the object automatically.
You can also move the mount via the handpad with buttons,
watching the ticks on the encoder box.
Full GoTo via the Argo Navis will be available this
summer, no laptop required.
Laptop control via Scope
2 is included.
Cost
is dependent on the options you choose, click here to skip the details
and see the pricing and options page
Operation
You can connect an Argo
Navis, Sky Commander, PDA or laptop with planetarium software
to the servo controller to find objects. A laptop is not required however.
There are 2 encoders for each axis and 2 encoders attached to the motors.
Initialization for the servo controller requires alignment to Celestial
North via the main optics and two stars. A manual of basic operation will
be online on this site.
The Scope2 software is included with the mount. Scope2
can run on a Mac or a Windows/Linux computer. Connection is made via a
serial cable, included. Wireless serial connections are available. This
software allows a computer interface and all the necessary routines for
ultra precision pointing. Other specific scope 2 software features are
listed on the BBAstroDesigns web
site
Optics Capacity
The mount is designed to use one, two or three large
scopes at one time. Not 3 small refractors, but more along the lines of
a 6" refractor, an 8-10" newt and a 14" SCT. The inverted fork or bridge
is removable if desired. The top of the bridge is designed and tested to
carry up to 45 lbs alone. Each end of the Altitude shaft is designed to
carry 45 lbs of optics.
The long white scope pictured above is an 8" f8 with
a 25 lb. piece of steel under it for testing the weight capacity. It is
weight equivalent to a 14" SCT. The white refractor is a 5" Meade, also
with 25 lbs of added test weight. The other scope is a 6" newt with 25
lbs of added test weight.
Convergence of the optical path from two or three optics
is made possible by the use of the Alt/Az adjusters on the sides of the
altitude shaft (the three disks). There is more than ample motion
in the adjusters to allow the optical paths to converge.
Electronics
One small 3" x 5" box inside the mount houses the
servo electronics. You can remove the box and replace it in minutes if
the electronics ever fail. The electronics are purchased directly from
http://www.bbastrodesigns.com.
The motors and encoders all have RJ type plugs, no tools are needed to
remove the wires to the electronics. Picture inside
is here
Control Panel
The front control panel is simple to read and use.
The connectors are all telephone type sockets. There are 2 red LED's recessed
into the front plate to help you operate the servo controller. The power
switch is just a simple red on/off toggle. All of the sockets are recessed
below the surface for durability. You normally need to use 2 of the sockets.
One for the handpad and one for the encoder box. A serial port is included
for pre-programming the servo controller or using a laptop/PDA for computer
controlled GoTo operations via a planetarium or the Scope2 software. A
close up is here.
Counterweights
What little counterweight that is required can typically
be substituted by using the batteries as counterweight. Small, thick, inexpensive
plates of steel can be added into the battery boxes for additional counterweight.
Users having need of more counterweight can have that installed at build
time or add it later by purchasing metal locally. Larger batteries can
also be used in the battery boxes. The battery boxes are attached by hand,
no tools required. There is a long double slot in each of the bridge arms
to allow for movement up and down the arms for balancing the optics. A
special bolt head and threaded plate in the battery box allows for securing
the battery boxes by hand. You can see that here.
Power
A pair of 7 amp hour sealed lead acid batteries are
good for 4 nights of observing before needing to be recharged. Only
one is needed for mount operations. A cigarette lighter outlet is included
on one battery box for dew heaters and accessories to plug into. Current
usage is approximately one amp per hour when slewing, less when tracking.
Motors
Motors are a pair of standard Pittman 1.37" diameter
gearhead servo's with 500 count encoders attached to the motor shaft. They
are purchased new, not surplus. The motors are mounted on 3- 1/2" thick
rubber plate mounts to eliminate vibration noise when tracking or slewing.
Encoders
This mount has a pair of 10,000 tick encoders attached
to each axis. The altitude axis has a 1.3:1 overdrive for that encoder.
See the options page for options if you have a pair you want used in your
mount.
Gears
The gears are precision made 360:1 bronze gears with
stainless steel worms. These are the same gears used on "other brands"
of telescopes. Pictures of the gears and "hands free" friction clutches
are here 1 2
The clutches and worm holders are precision machined in house.
The one piece solid steel worm holder has needle roller
and thrust bearings on each axis. No bronze bushings are used. You
can see an example here.
All components are professionally powder
coated.
Bearings
The Azimuth axis has a 2" precision tapered roller
bearing running on a 2" OD stainless steel shaft. The Altitude axis has
2 precision tapered roller bearings on each axis and a 2" stainless steel
shaft. the Azimuth axis also uses .250" ball bearings in a 8" diameter
race for stability.
Material Types Used
The bridge is made of 1" x 3" 6061 aluminum. The main
box is made of 1/2" aluminum plate. The azimuth plates are made of 7/8"
thick aluminum 6061.
The adjusters are aluminum 6061, 1/2" thick. The worm
mounts are solid steel. The bearing races and their holders are steel as
well. Total weight, minus batteries is 75 lbs. Picture
of an alt/az adjuster is here.
Hand Held Controls
In typical operations, you will have a handpad to
control the servo motors and an Argo
Navis or Sky Commander like device. Some users will also have a focuser
controller. Included is a controller board to affix all of your hand held
controls to with industrial strength Velcro. It is made of lightweight
aluminum and designed for easy holding with one hand. Picture
is here:
Pier
A standard 1/2-13 threaded hole is in the bottom of
the mount for attaching to a pier. We will make whatever threaded hole
or adapter plate that is needed however. A typical tripod is not
recommended, due to the weight involved in typical use and the length of
the fork arms. There are many vendors that sell good quality piers that
we can purchase for you or adapt the mount to fit one you may already have.
We will be offering a motorized height adjustable
pier with this mount this fall.
Transporting
We have incorporated handles into the black box to
facilitate loading and unloading. They are removable in a few seconds and
really make moving the black box a lot easier. No tools are required. Pictures
12
3
Optics mounting
Due to the wide variety of optics mountings in use,
we will custom make the bolt patterns needed for each individual mount
as requested by the customer. If you have Tak mounting plates, with 8mm
bolts spaced 35 mm apart, we will make the necessary threads and holes.
If you are wanting an AP dovetail bolt pattern, you can have that too.
Tube rings and the like will be vended, we just don't have time to make
all of the parts in house.
Options/Pricing
Yes,
you really have options available to you !
Credit
& Vendor page
GoTo & Tracking Systems
5000 Green Hollow Dr.
Arlington Texas 76017-5910
(817) 468-0154
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