Astro-Physics
1100GTO Mount Options, Upgrades and Spare Parts

As time goes on, this page will outline a variety of options and spare parts for the 1100GTO German Equatorial Mount.

1100GTO Absolute Encoder Kits

At this time, the Absolute Encoders Kits are not available for purchase. We anticipate that they will be ready to order in 2014. If you wish to purchase the Absolute Encoders for your 1100GTO, we encourage you to order them to be installed at the time that your mount is assembled and tested. Please review the information here.

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1100GTO Limit/ Homing Switch System

At this time, the Limit/Homing Switch System is not available for purchase. We anticipate that they will be ready to order in 2014. Instructions will be provided for installation.

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Flat Surface Adapter for 1100GTO and all 900 Mounts (119FSA)

In late 2012, the Flat Surface Adapter (formerly part # 900FSA) was upgraded to include four additional thru-holes for more secure attachment to a flat plate with the larger 1100GTO and its payload in mind. It also includes "N" and "S" engraving to ensure that the base of your mount will be oriented in the correct direction when it is inserted.

 

 

1100GTO
The base of the 1100GTO slips directly into the 119FSA. There is no need for an extra pier adapter, as the 1100 incorporates the functionality of the Precision-Rotating Pier Adapter into its base. The extended latitude range of the 1100 also eliminates the need of a polar wedge.

900 (all versions)
Use this adapter for these applications:

The Flat Surface Adapter is black-anodized, precision-machined aluminum.

Attach to flat surface
The Flat Surface Adapter bolts onto the flat surface on the top of your pier or tripod. Your pier's top plate should be a minimum of 7.75" in diameter. The 119FSA itself is 8.375" in diameter. It adds 1.265" to the height of your mount.

The bolt circle for attaching the 900 Flat Surface Adapter to your pier is 7.230” in diameter. Please refer to the PDF link provided on the diagram to the right for detailed information on attachment preparation.

The holes for mounting the 119FSA to your flat surface are counter-bored to accept the head of standard ¼” socket head cap screws (13/32” or 0.406” diameter). This allows the 1100 base or 900 Pier Adapter to sit in the Flat Surface Adapter without interference. Because installations will vary, we do not provide the screws for mounting the Flat Surface Adapter to your pier or tripod.

Attach to 900 Hi-Lo Latitude Wedge
Match four holes and bolt the 119FSA in place. Then, your Pier Adapter simply slips in (just as it fits into our pier) and you fasten from the side with the six screws and washers provided with the Pier Adapter for your 900 mount.

Fasteners are not supplied.

Note: You may wish to consider purchasing our Flat Pier Plate with Flat Surface Adapter for 1100GTO and all 900 Mounts (119FSA-FP) if you are fabricating your own pier and need a flat plate to fit into the top. Some modification may be required to fit your pier I.D.

119FSA$130.00 NovemberAdd 119FSA To My Cart

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Flat Pier Plate for 8" ATS and other non-Astro-Physics piers (119FP)

This Flat Pier Plate (119FP) has been machined to the specifications of the Advanced Telescope System (ATS) 8” pier with 1/8” wall thickness.  It is sized to fit directly into the pier without modifications and provide a mounting surface for our 8” Flat Surface Adapter (119FSA) (previously 900FSA).  It will add 0.35” to the height of the pier.

Owners of the Mach1GTO will be pleased to know that additional holes have been drilled and tapped for our 6” Flat Surface Adapter (ADATRI). This will allow the Mach1GTO and all 400 and 600 mounts to be used on an 8” pier, providing greater stability for imagers when using larger scopes in windy or adverse conditions.

The bottom, pier-inserting portion of this plate has additional thickness to allow custom machining so as to fit a smaller inside diameter pier.  Please refer to the PDF schematic for dimensions.

Pier options:

  • Use with the 8” ATS pier with 1/8” wall thickness (no modification required)
    The base of the 119FP has already been machined per the specifications provided by ATS to fit into their piers that have 1/8" wall thickness without further modification.
  • Use with the 8” ATS pier with 1/4” wall thickness (modification required)
    If you choose to order the 8" ATS Pier with the 1/4" wall thickness, ATS will modify the base diameter for a small up-charge.
  • Use with other piers (may require custom modification)
    Machine the bottom portion of this plate to fit the I.D. of your pier, if necessary. Please refer to the diagram to determine if your pier is suitable.

Top attachment options:

  • Attach 8” 119FSA (use existing tapped holes)
  • Attach 6” ADATRI (use existing tapped holes)
  • Attach custom  mount adapter (machine custom tapped holes)

If you intend to attach an 1100GTO or older 900 mount to the ATS pier, then it is best to choose the combination Flat Surface Adapter with Flat Pier Plate (119FSA-FP).  It is a two-part adapter that combines both the 119FSA and the 119FP. 

Fasteners included:
1/4-20 x 3/4" (8) - attaches 119FSA to Flat Pier Plate (119FP)
5/16-18 x 5/8" (6) and washers - attaches 119FP to ATS pier

Note:  Since the bottom of the flat plate is designed to fit into the 8" ATS Piers, the diameter (7.700") is too small to be used in the Astro-Physics 8" Portable Piers.

119FP$145.00 in stockAdd 119FP To My Cart

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Flat Surface Adapter with Flat Pier Plate for 1100GTO and all 900 Mounts - For 8" ATS and other non-Astro-Physics piers (119FSA-FP)

If you are ordering a 8" ATS pier for your 1100GTO, you will need to order this adapter to interface the pier post with the base of your mount. You may also consider it if you are fabricating your own pier for either the 1100GTO or any 900 mount. You do NOT need this adapter for the 8" Astro-Physics Piers.

This item is constructed of two machined aluminum parts bolted together - a thick flat plate and our Flat Surface Adapter for 1100GTO and 900 Mounts (119FSA). This adapter is not required when using our 8" Portable Piers.

The lower flat-plate section of this adapter is also drilled and tapped so that the ADATRI can be attached. This allows the Mach1GTO and all 400 and 600E mounts to be attached to your 8" pier.

Use with 8" ATS Piers and 1100GTO

  • The base of the 119FSA-FP has already been machined per the specifications provided by ATS to fit into their piers that have 1/8" wall thickness (I.D. 7.700") without further modification. The 1100GTO will fit directly into the top portion of the 119FSA-FP. If you choose to order the 8" ATS Pier with the 1/4" wall thickness, ATS will modify the base diameter for a small up-charge. This adapter adds 1.616" to the height of the ATS pier.

Use for Other Piers and 1100GTO

  • Machine the bottom portion of this plate to fit the I.D. of your pier, if necessary. Please refer to the diagram to determine if your pier is suitable. The base of the 1100GTO will fit directly into the top portion of the 119FSA-FP.

Use for Other Piers and 900 Mounts

  • Machine the bottom portion of this plate to fit the I.D. of your pier, if necessary. Please refer to the diagram to determine if your pier is suitable.
  • These adapters for the 900GTO will fit into the top portion: Precision-Adjust Rotating Pier Adapter (900RPA), Standard Pier Adapter (900SPA), or 900 Hi-Lo Latitude Wedge (900WDG or 900WDGA).

Fasteners are supplied for attaching the 119FSA-FP to ATS or other similar pier.

119FSA-FP$265.00 NovemberAdd 119FSA-FP To My Cart

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Copyright © 2013, Astro-Physics, Inc. - All Rights Reserved
This page was last modified: October 9, 2014

Astro-Physics, Inc.
11250 Forest Hills Road, Machesney Park, IL  61115, U.S.A.
Phone: 815-282-1513   Fax: 815-282-9847