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The Black Box Multiple Telescope GoTo Mount

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  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