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Tandem Guidescope Aiming Device (TGAD)
For Tandem and Triad Telescope Mounting Bars
Alighning two telescopes can now be easy. No need for shims and endless trial and error. With a TGAD you just aim while looking through the one scope and tighten the knobs. Done.
Note: The illustrations below were taken sometime ago. Since then, there have been a few changes. The TGAD now comes with short knobs in positions A & B (below). This is to solve a clearance problem on some setups. The images above show the current knob sizes. If you already have a TGAD and want short knobs, order them here.
A and B knobs are for altitude adjustment. There are two precision balls (from ball bearings) between the bottom and middle plate. The balls act as a fulcrum for the upper plates -- allowing them to tilt, but remain solidly in place. The link G connecting the bottom and middle plates prevents the plates from coming apart if A and/or B were to become too loose.
To raise the altitude of the OTA, loosen knob A and tighten B. To lower the altitude, tighten A and loosen B.
All three anodized aluminum plates are milled with a web pattern to reduce weight and maintain strength. Brass seats are used in the bottom and middle plates to capture the fulcrom balls. The illustration below is of the top side of the bottom plate. The four holes forming a square pattern are used to bolt it to a tandem bar.
M in the illustration below points to the four holes for mounting the TGAD on a tandem bar as seen from the bottom side of the bottom plate.
C, D, and E control Azimuth. C & D clamp the middle and top plates together to lock the azimuth position. E controls the azimuth adjustment with stainless steel threads and a brass pusher. Loosen C & D and turn E to adjust azimuth. The F nuts allow you to adjust the backlash in the azimuth adjustment threads. This is only important for the aesthetics of using the adjustment knob. The azimuth rigidity during imaging is assured by the lock-down knobs C & D.
To attach an OTA to the TGAD, mounting holes are provided form my saddles (M) and Takahashi EM clamshell rings (EM). The illustration below shows a Dove12 with red knobs attached to the top of the TGAD. Note the clear anodized azimuth adjustment knob of the TGAD showing from behind the Dove12.
Sample Photos from Gary Law
Gary tested one of the prototypes of the Tandem Guidescope Aiming Device (TGAD). Here are a couple images created while using it.
Click on images for larger versions.
"It [TGAD] presents an excellent and solid platform for the scope. The adjustments were smooth and precise allowing me match the FOV's on my two scope/ccd combinations." -- Bill Patterson
*Shipping Charges are for the Continental 48 States. Contact me for costs to Hawaii, Alaska.
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Astro Accessories from RobinCasady.com
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