Eagle Mach 1 Specifications download pdf (Page 15)

While there is no required orientation of the mounting plate, we have found the two orientations in the photo on the previous

page to work very well. The advantage to the pictured orientations is primarily in the ease of working the clutch knobs, and

in providing the easiest routing for cables. Note that your D

ECLINATION HUB PLATE may not be oriented properly for this

arrangement. If not, simply remove and rotate it into this position with respect to the clutch knobs and cable channels. As

pictured on the previous page, the two Cable Channels are at 12 o’clock and 6 o’clock. The clutch knobs are at 3, 7 and 11

o’clock. The optical axis for a plate with the four-hole pattern is directly over the cable channels. Plates with the six-hole

pattern are rotated a bit to allow the attachment bolts to clear the Cable Channels

Assemble Counterweight Shaft

IMPORTANT: Always attach the counterweights before mounting the telescope to the cradle plate

to prevent sudden movement of an unbalanced tube assembly, which may cause damage or injury.

Remember counterweights are heavy and will hurt if they fall on your foot.

1. Thread the C

OUNTERWEIGHT SHAFT onto the Dec. axis. Be careful to NOT cross-thread the shaft in the adapter!

2. Remove the C

OUNTERWEIGHT SAFETY KNOB AND WASHER (or the one-piece Safety Stop if you are using the 1.875”

diameter shaft) from the base of the C

OUNTERWEIGHT SHAFT. Add sufficient COUNTERWEIGHTS (purchased

separately) to the C

OUNTERWEIGHT SHAFT to balance the telescope you intend to use. Loosen the counterweight

knob and hold the counterweight with the knob pointing downward so that the brass pin will move from the center

opening allowing the counterweight to slide into position. Always use two hands to attach or move the

counterweights on the shaft. It is advisable to have the counterweight knob pointing down toward the pier. This

will minimize the chance of accidentally loosening the counterweight during the observing session.

3. Reattach the C

OUNTERWEIGHT SAFETY KNOB AND WASHER to the end of the COUNTERWEIGHT SHAFT. This will help

to prevent injury if someone accidentally loosens the COUNTERWEIGHT KNOB.

NOTE: A firm tightening of the C

OUNTERWEIGHT KNOB will not damage the surface of the COUNTERWEIGHT SHAFT. The pin that

tightens against the stainless counterweight shaft is constructed of brass. Likewise, the bronze sleeve that has been press

fitted into the center of the C

OUNTERWEIGHT will prevent marring of the shaft as you move the COUNTERWEIGHTS up and down.

Optional 10.7” x 1.875” Counterweight Shaft

The optional 10.7” total length x 1.875” diameter Counterweight Shaft offers some additional

capabilities and considerations. The shaft installs in the same way as the standard shaft, but

instead of a S

AFETY KNOB AND WASHER, this shaft uses the One Piece Washerless Safety

Stop (M12676) at the end of the shaft. For safety, you MUST use this Safety Stop! There

are two main reasons why a person might choose the Optional Counterweight Shaft over the

standard 14.5” x 1.12

5” shaft:

1. Owners of 900 or 1200 series mounts might

prefer to purchase the optional shaft because it

uses the same 10 lb. (10SCWT) and 18 lb.

(18SCWT) counterweights that those bigger

mounts use. These counterweights have larger

1.875” diameter center holes. Please note that this shaft weighs in at a hefty

7.7 lbs. including the safety stop. To facilitate lighter instruments, we have

added a 5 lb. counterweight (5SCWT) to the product line to join the other two

weights with the larger center holes.

2. Owners who plan to use their Mach1GTO for long-distance travel may wish

to purchase this shaft for a more compact fit in a travel case. The 10.7” shaft

was specifically designed to fit inside the hollow declination shaft and screw into

the C

OUNTERWEIGHT ADAPTER from the back side. When fully screwed into the

adapter, and with the Safety Stop in place, the whole thing only protrudes about

3/4” from the face of the D

ECLINATION HUB PLATE. To prevent you from

accidentally getting the shaft stuck inside the dec axis, we added a

socket head screw to the end of the shaft. Simply use your 1/4” hex

key to break it loose if needed.

Keep in mind that the combined weight of the equatorial head and

shaft will be 36.2 lbs. not counting the GTOCP3 control box, keypad,

cables or the travel case itself. With the mount’s two axes separated,

and the shaft thus stored, it will all fit neatly into a case that should fi

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Eagle Mach 1 Specifications Page 15

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