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Adjustable Equatorial Mount GAEM

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#1 degazhon

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Posted 18 January 2021 - 10:52 PM

https://www.youtube....DGDf5xo84&t=61s

What do you think guys?


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#2 Tapio

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Posted 18 January 2021 - 11:58 PM

Interesting design.

Would love to hear english explanation of it though.



#3 degazhon

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Posted 19 January 2021 - 01:02 AM

Hi Tapio,

There is my comments in English below the video. Actually the video is self explanatory (I believe). There is just commands given to George which direction to rotate the telescope to demonstrate how flexible the GAEM mount is in comparison with German mount. Main purpose of the design is comfort for visual observer. As you know, todays mounts (both equatorial and altazimuth) can be directed to an object from only position. So observer should adjust his body position accordingly to proceed with the observation. Many times it is quite uncomfortable position (especially for German mount). GAEM allows observer to carry out observation from his desire position (except zenith where there is no clearance for height adjustment, but you still can make 360 degree azimuth adjustment as shown on video). Also as you can see there is almost no need to operate Thumb knobs. You just direct the telescope to object and start observation. You also can see boll head has Teflon O rings inside for low friction. Telescope and counterweights are balanced with combined weight in center of the ball head. So very little force required to operate clock drive for any telescope position.



#4 Tapio

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Posted 19 January 2021 - 01:23 AM

Sorry I missed the comments.

Where did you get the ball head or is it self made ?



#5 mrlovt

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Posted 19 January 2021 - 01:37 AM

Very interesting. I'd like to try it!  It's difficult to tell in the video exactly how easy it is to adjust eyepiece height once the target is acquired.



#6 degazhon

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Posted 19 January 2021 - 02:23 AM

Guys,

It is just working prototype of the GAEM proving that it works. Spherical Joint (Ball Head) is home made with some local workshop machinery help. You can see the ball itself is 100mm bocce ball, Poly-resin composite for long-lasting strength (works well but a beat heavy as it is massive ball no sphere). The  ball head stiffness is adjustable, from near zero as thumb knob on the ball head is loosen (during balancing), till stiff enough to prevent any movement by hand force. so you can adjust the stiffness as you'd like. the ball is squished inside the shell and cap by O rings (located in shell and cap internal grooves) UHMW ring from bottom and Teflon one from the top. It should be noted, that there is no noticeable jugging during the movement (looks like Teflon and UHMW work well with Poly resign as bearing couple). The movement is much more smooth in comparison with  Skywatcher classic 200 (No GOTO) Dobsonian we have to compare with. O ring made with PFA with better anti static properties will be perfect I believe, but I couldn't get the material in Georgia (My country) to try on. George (the video "star", my son) has Meade 350 mount with Meade battery clock drive for his 8C telescope and 8" skywacher I mentioned, but he prefers to use GAEM due to it's intuitive, simple and comfortable (almost always sitting in chair) operation.


Edited by degazhon, 19 January 2021 - 08:45 AM.

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#7 alphatripleplus

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Posted 19 January 2021 - 08:51 AM

Nice idea.



#8 Tapio

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Posted 19 January 2021 - 09:44 AM

I guess visual only.



#9 photoracer18

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Posted 19 January 2021 - 09:04 PM

Could use a slow-motion control on the DEC below the OTA. Trick is polar alignment. Other than that it looks useful as a portable mount. Key to a ballhead is the clamping force on the ball as that determines the weight limit.



#10 degazhon

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Posted 20 January 2021 - 02:12 PM

Georgian Adjustable Equatorial Mount (GAEM) consists of 2 bars connected in T-shape with a spherical joint (ball head) at T joint. Like German Equatorial mount, the bottom bar is right ascension  RA axis (1) aligned to celestial pole of the earth. The RA axis (1) has a worm wheel at the bottom and ball head sphere (3) on the top. The RA axis (1) sits in and rotates in an altazimuth adjustable plate (11). Second bar, multifunction axis (5) similar to declination axis of German equatorial mount holds telescope from one end and counterweights to balance telescope weight to another. as RA and multifunction axis are connected with spherical joints, the multifunction axis (5) has 3 degrees of freedom (DoF). In comparison, the German equatorial mount has 2 DoF. The spherical joint allows the user to rotate the multifunction axis (5) in any direction. Sphere (3) of the ball head is hard connected on the top of the RA axis (1) and trapped between the ball joint shell, located at the middle of the multifunction axis (5) and the shell cap (4). Both, the shell and its cap have low friction material (Teflon, UHMW etc.) O rings inside their internal grooves to avoid friction wear between the shell and sphere. 3  shell and cap connecting nuts (8) regulates stiffness of the ball head.
The RA axis (1) sits in Double Roller Bearing (10) (Tapered, Double Row, 2-Seals). The bearing itself is pressed inside a plate (11) of precise polar alignment capable of static base (2). There is a worm gear mechanism (12) at the bottom of the RA axis (1) equipped with a clock drive motor (can be hand driven as an option). The motor has reverse and speed control.
The worm gear rotates the RA axle (and rest of the mount including telescope) against the base (2).
As ball head has 3 degrees of freedom (DoF), when the bolt (8) is loosen, user can rotate the multifunction bar (5) with telescope around virtual Vertical axis (V), Horizontal axis(H) and Declination axis(D).
The multifunction bar (5) Rotation around the virtual vertical (V) axis varies declination of the telescope. Rotation about the (D) axis varies right ascension of the telescope. Rotation about the horizontal (H) axis allows the user to adjust the telescope's location from ground (without changing the telescope's direction).
Operation:
Note: be careful to prevent uncontrolled movement of the telescope during assembling/balancing.
Secure Static base (2) on tripod or another standing devise.
Hand tight thumb bolts (8) and (9). Install counterweights (7) on the counterweight rod.
Install telescope tube mounting rings on fast lock coupling mounting Plate (6).
Install a telescope on the tube rings.
Install all necessary gears on the telescope (e.g. eyepiece, finder scope etc.).
Slightly loose thumb bolt (8) and telescope tube thumb bolts and balance telescope with counterweights around spherical joints (ball head). Tighten the telescope tube thumb bolts after balance.
Conduct polar alignment of the shaft (1) using static base (2) thumb bolts.
Start clock drive. Direct telescope to desired celestial object. Overcome rotation limit on right ascension  axis (D) by using fast coupling (6) thumb bolt (9). Lock thumb bolt (8). Start observation.
During operation pay attention to leave enough room for telescope rotation to prevent telescope contact with static base (6) and/or tripod.
Advantages of the GAEM:
1. The GAEM is quick adjustable. It allows the user to direct the telescope to the desired position. in comparison GEM and/or altazimuth mounts have only fixed position (not adjustable) for the observer when directed to the object.
2.Using this mount, the user can point the telescope to any direction from both sitting and/or standing position (this function reduces close to zenith and observing position is fixed at zenith). This makes usage of the mount much more intuitive and comfortable for observers in comparison with existing telescope mounts (equatorial and/or altazimuth mount).
3.This mount is robust, compact and lightweight in comparison with the same spec GEM. As by my experience it vibrates less in comparison with GEM for the same load.
4. It has less parts (in comparison GEM has a minimum 4 bearing which requires precision manufacturing of rolling surfaces, fine tune and periodic maintenance by qualified mechanic, whilst GAEM has only one maintenance free bearing) and so easy and cheap for production.
5. unlike GEM, GAEM has no meridian flip issue
6. No blind spot at zenith
Note: The video in YouTube and the drawing attached is a working prototype of the invention. Design of the production version has globe shape at the middle (the spherical joint looks like globe with 2 side arms (multifunction bar) and 1 leg (RA axis) from the bottom)


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#11 orlyandico

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Posted 20 January 2021 - 03:48 PM

It looks like this would be really hard to implement GoTo for because every time you loosen the top ball to freely rotate the scope, you would lose GoTo alignment.

 

EDIT: it only has one worm wheel, so really is not for GoTo use.



#12 degazhon

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Posted 21 January 2021 - 04:59 AM

It is not GOTO system for sure. It is for visual observation and for the observer's comfort. I am trying to attach drawing but with no success ...



#13 degazhon

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Posted 21 January 2021 - 05:23 AM

I only managed to upload the drawing in 'My Gallery' only. sorry for any inconveniences



#14 alphatripleplus

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Posted 21 January 2021 - 08:56 AM

I only managed to upload the drawing in 'My Gallery' only. sorry for any inconveniences

If you are trying to upload a picture into your post, it should load if it is under the 500kb limit for images in posts.



#15 degazhon

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Posted 24 January 2021 - 09:40 AM

 
 
tn_gallery_336475_15724_135983.jpg

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#16 degazhon

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Posted 24 January 2021 - 09:43 AM

Georgian Adjustable Equatorial Mount (GAEM) consists of 2 bars connected in T-shape with a spherical joint (ball head) at T joint. Like German Equatorial mount, the bottom bar is right ascension  RA axis (1) aligned to celestial pole of the earth. The RA axis (1) has a worm wheel at the bottom and ball head sphere (3) on the top. The RA axis (1) sits in and rotates in an altazimuth adjustable plate (11). Second bar, multifunction axis (5) similar to declination axis of German equatorial mount holds telescope from one end and counterweights to balance telescope weight to another. as RA and multifunction axis are connected with spherical joints, the multifunction axis (5) has 3 degrees of freedom (DoF). In comparison, the German equatorial mount has 2 DoF. The spherical joint allows the user to rotate the multifunction axis (5) in any direction. Sphere (3) of the ball head is hard connected on the top of the RA axis (1) and trapped between the ball joint shell, located at the middle of the multifunction axis (5) and the shell cap (4). Both, the shell and its cap have low friction material (Teflon, UHMW etc.) O rings inside their internal grooves to avoid friction wear between the shell and sphere. 3  shell and cap connecting nuts (8) regulates stiffness of the ball head.
The RA axis (1) sits in Double Roller Bearing (10) (Tapered, Double Row, 2-Seals). The bearing itself is pressed inside a plate (11) of precise polar alignment capable of static base (2). There is a worm gear mechanism (12) at the bottom of the RA axis (1) equipped with a clock drive motor (can be hand driven as an option). The motor has reverse and speed control.
The worm gear rotates the RA axle (and rest of the mount including telescope) against the base (2).
As ball head has 3 degrees of freedom (DoF), when the bolt (8) is loosen, user can rotate the multifunction bar (5) with telescope around virtual Vertical axis (V), Horizontal axis(H) and Declination axis(D).
The multifunction bar (5) Rotation around the virtual vertical (V) axis varies declination of the telescope. Rotation about the (D) axis varies right ascension of the telescope. Rotation about the horizontal (H) axis allows the user to adjust the telescope's location from ground (without changing the telescope's direction).
Operation:
Note: be careful to prevent uncontrolled movement of the telescope during assembling/balancing.
Secure Static base (2) on tripod or another standing devise.
Hand tight thumb bolts (8) and (9). Install counterweights (7) on the counterweight rod.
Install telescope tube mounting rings on fast lock coupling mounting Plate (6).
Install a telescope on the tube rings.
Install all necessary gears on the telescope (e.g. eyepiece, finder scope etc.).
Slightly loose thumb bolt (8) and telescope tube thumb bolts and balance telescope with counterweights around spherical joints (ball head). Tighten the telescope tube thumb bolts after balance.
Conduct polar alignment of the shaft (1) using static base (2) thumb bolts.
Start clock drive. Direct telescope to desired celestial object. Overcome rotation limit on right ascension  axis (D) by using fast coupling (6) thumb bolt (9). Lock thumb bolt (8). Start observation.
During operation pay attention to leave enough room for telescope rotation to prevent telescope contact with static base (6) and/or tripod.
Advantages of the GAEM:
1. The GAEM is quick adjustable. It allows the user to direct the telescope to the desired position. in comparison GEM and/or altazimuth mounts have only fixed position (not adjustable) for the observer when directed to the object.
2.Using this mount, the user can point the telescope to any direction from both sitting and/or standing position (this function reduces close to zenith and observing position is fixed at zenith). This makes usage of the mount much more intuitive and comfortable for observers in comparison with existing telescope mounts (equatorial and/or altazimuth mount).
3.This mount is robust, compact and lightweight in comparison with the same spec GEM. As by my experience it vibrates less in comparison with GEM for the same load.
4. It has less parts (in comparison GEM has a minimum 4 bearing which requires precision manufacturing of rolling surfaces, fine tune and periodic maintenance by qualified mechanic, whilst GAEM has only one maintenance free bearing) and so easy and cheap for production.
5. unlike GEM, GAEM has no meridian flip issue
6. No blind spot at zenith
Note: The video in YouTube and the drawing attached is a working prototype of the invention. Design of the production version has globe shape at the middle (the spherical joint looks like globe with 2 side arms (multifunction bar) and 1 leg (RA axis) from the bottom)tn_gallery_336475_15724_135983.jpg




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