Center of Mass

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GCoyote
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Center of Mass

#1

Post by GCoyote »

Plan: Build this DIY wedge for my ~ 5 lb Mak to sit on.
EQ Wedge DIY.jpg
EQ Wedge DIY.jpg (9.61 KiB) Viewed 654 times

Qptions
  • a. Just center everything and hope for the best.
  • b. Try to estimate an offset to mounting holes so the center of mass of the scope is roughly over the vertical axis through the tripod.
  • c. Try to include a counter weight attachment point so I can balance it after the fact.
Any thoughts, insights, tips, tricks, chemically induced metaphors are welcome.
Any metaphor will tear if stretched over too much reality.
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yobbo89
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Re: Center of Mass

#2

Post by yobbo89 »

i think you're over thinking this wedge idea :lol: 2 kg is nothing . is your mak on an alt az mount ? do you a have link or an image ?
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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yobbo89
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Re: Center of Mass

#3

Post by yobbo89 »

GCoyote wrote:
Fri Aug 14, 2020 1:09 pm
Plan: Build this DIY wedge for my ~ 5 lb Mak to sit on.

Image




chemically induced metaphors are welcome.
hahahah
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

Image
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GCoyote
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Re: Center of Mass

#4

Post by GCoyote »

yobbo89 wrote:
Fri Aug 14, 2020 5:57 pm
i think you're over thinking this wedge idea :lol: 2 kg is nothing . is your mak on an alt az mount ? do you a have link or an image ?
The mount was $25 bucks so I'm not out much if it falls off the deck. I want to practice on this easy one out before I try to mount anything heavier or more complicate.

Because the Mak is so short, the weight is pretty far back.
Cosmos Alt Az Mount sm.jpg
Any metaphor will tear if stretched over too much reality.
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Re: Center of Mass

#5

Post by JayTee »

The design was intended to hold a Celestron SLT or GT Alt-Az mount. If you plan on using a different Alt-Az mount then you may need to adjust the placement of the hole that attaches the wedge to your tripod so your mount's CG is roughly centered over the tripod. Exact positioning is not really needed.
From the picture, you can see that for the SLT/GT you to place the tripod attachment hole 1 1/4" from the hinge line.
Image

Cheers,
JT
BTW, it was my article and my design that you are building. If you have any questions, don't hesitate to ask. jt
∞ Scopes: Celestron CPC1100 #2 Scope: 8" f/7.5 Dob AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scopes: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs
∞ Mounts: iOptron CEM60, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: Canon T3i (x2), ZWO ASI294MC Pro & 120MC, Orion SSAG
∞ Binos: 10X50,10.5X70,15X70², 25X100
∞ EPs: ES: 21 100°, 30 82° X-Cels: 9, 12, 18, 25 GSO:15,20
Home Wx (click)

I never met a scope I didn't want to keep. "My God, it's full of stars." Searching the skies since 1966!
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KathyNS
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Re: Center of Mass

#6

Post by KathyNS »

Mount the scope and mount on the wedge. Then slide a dowel under the base plate of the wedge and move it north or south until the whole contraption balances. Mark the location of the dowel. That is (directly below) the centre of mass.

That's how I balanced my wedged C-90:
C90GrabnGo.JPG
Image
DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Hall's Harbour Observatory (H2O)
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Re: Center of Mass

#7

Post by JayTee »

Thanks for that tip Kathy.

That is exactly how I balance my side-by-side AP set up before it gets mounted into the CEM60 saddle.

Cheers,
JT
∞ Scopes: Celestron CPC1100 #2 Scope: 8" f/7.5 Dob AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scopes: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs
∞ Mounts: iOptron CEM60, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: Canon T3i (x2), ZWO ASI294MC Pro & 120MC, Orion SSAG
∞ Binos: 10X50,10.5X70,15X70², 25X100
∞ EPs: ES: 21 100°, 30 82° X-Cels: 9, 12, 18, 25 GSO:15,20
Home Wx (click)

I never met a scope I didn't want to keep. "My God, it's full of stars." Searching the skies since 1966!
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GCoyote
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Re: Center of Mass

#8

Post by GCoyote »

KathyNS wrote:
Fri Aug 14, 2020 10:55 pm
Mount the scope and mount on the wedge. Then slide a dowel under the base plate of the wedge and move it north or south until the whole contraption balances. Mark the location of the dowel. That is (directly below) the centre of mass.

That's how I balanced my wedged C-90:
Excellent, that's what I need to know!
Any metaphor will tear if stretched over too much reality.
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GCoyote
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Re: Center of Mass

#9

Post by GCoyote »

JayTee wrote:
Fri Aug 14, 2020 10:23 pm
The design was intended to hold a Celestron SLT or GT Alt-Az mount. If you plan on using a different Alt-Az mount then you may need to adjust the placement of the hole that attaches the wedge to your tripod so your mount's CG is roughly centered over the tripod. Exact positioning is not really needed.
From the picture, you can see that for the SLT/GT you to place the tripod attachment hole 1 1/4" from the hinge line.
Image

Cheers,
JT
BTW, it was my article and my design that you are building. If you have any questions, don't hesitate to ask. jt
I was wondering why it looked familiar but I got it from AF.net and the rest of post is no longer available. It looks very simple and clean which is why I went with this one. I'll let you know if I have more questions.

Thanks everyone!
Any metaphor will tear if stretched over too much reality.
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Re: Center of Mass

#10

Post by JayTee »

Here's the whole article with build instructions. I pulled from AF over to here, early on.
https://theskysearchers.com/viewtopic.php?f=24&t=3129

BTW, I use a turnbuckle where the spings are for holding the correct latitude, the altitude adjustment lock. I found it made this wedge just a bit more solid for heavier loads on the mount.

Cheers,
JT
∞ Scopes: Celestron CPC1100 #2 Scope: 8" f/7.5 Dob AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scopes: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs
∞ Mounts: iOptron CEM60, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: Canon T3i (x2), ZWO ASI294MC Pro & 120MC, Orion SSAG
∞ Binos: 10X50,10.5X70,15X70², 25X100
∞ EPs: ES: 21 100°, 30 82° X-Cels: 9, 12, 18, 25 GSO:15,20
Home Wx (click)

I never met a scope I didn't want to keep. "My God, it's full of stars." Searching the skies since 1966!
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GCoyote
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Re: Center of Mass

#11

Post by GCoyote »

I have a good bit of composite decking material leftover from the last upgrade. It's more stable in the humidity than wood and very easy to work.
Any metaphor will tear if stretched over too much reality.
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Re: Center of Mass

#12

Post by JayTee »

Please post pictures as you progress in your build. I am very interested in how things turn out for you.

Cheers,
JT
∞ Scopes: Celestron CPC1100 #2 Scope: 8" f/7.5 Dob AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scopes: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs
∞ Mounts: iOptron CEM60, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: Canon T3i (x2), ZWO ASI294MC Pro & 120MC, Orion SSAG
∞ Binos: 10X50,10.5X70,15X70², 25X100
∞ EPs: ES: 21 100°, 30 82° X-Cels: 9, 12, 18, 25 GSO:15,20
Home Wx (click)

I never met a scope I didn't want to keep. "My God, it's full of stars." Searching the skies since 1966!
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GCoyote
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Re: Center of Mass

#13

Post by GCoyote »

JayTee wrote:
Sat Aug 15, 2020 9:48 am
Please post pictures as you progress in your build. I am very interested in how things turn out for you.

Cheers,
JT

Well I was half way through my last project before the the thought to take some pics hit me. I still have to get the hardware for this job and it would be much better if I could do it out on the patio so I need the weather to not suck so much.
Any metaphor will tear if stretched over too much reality.
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GCoyote
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Re: Center of Mass

#14

Post by GCoyote »

I've got most of the hardware and started cutting the main bits of wood.

Question: I have an extra 3x finder scope I don't use. Any reason I can't mount it to one edge of the wedge plate to make polar alignment easier?
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Re: Center of Mass

#15

Post by KathyNS »

GCoyote wrote:
Sat Oct 17, 2020 12:46 am
I've got most of the hardware and started cutting the main bits of wood.

Question: I have an extra 3x finder scope I don't use. Any reason I can't mount it to one edge of the wedge plate to make polar alignment easier?
Go for it! Good luck with the build.
Image
DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Hall's Harbour Observatory (H2O)
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