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Need help with an Equatorial Platform


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Hello, I have been looking online at Equatorial Platform ideas for my 8" dobsonian.

This is what I partly followed: 
 



Here's everything I have ordered:

EQ1 motor drive
https://www.rothervalleyoptics.co.uk/skywatcher-ra-single-axis-economy-motor-drive-eq1.html

x2 Plywood: 610mm x 610mm - 18mm
https://www.ebay.co.uk/itm/Exterior-Hardwood-Plywood-BB-FSC-PLY-WBP-5mm-18mm-Cut-To-Size-Sheets/284101547528?ssPageName=STRK%3AMEBIDX%3AIT&var=585593433984&_trksid=p2057872.m2749.l2648

x2 Aluminum Sheet Plate 200mm x 200mm - 4mm
https://www.ebay.co.uk/itm/Aluminium-Sheet-Plate-Flat-1mm-4mm-Multiple-Sizes-Available-Grade-1050A-H14/283528663514?ssPageName=STRK%3AMEBIDX%3AIT&var=584704869651&_trksid=p2057872.m2749.l2648

x4 adhustable feet
https://www.ebay.co.uk/itm/M8-M10-M12-Levelling-Height-Adjustable-Machine-Furniture-Feet-with-Lock-Nut-UK/132754954645?ssPageName=STRK%3AMEBIDX%3AIT&var=432066591291&_trksid=p2057872.m2749.l2648

Compass
https://www.ebay.co.uk/itm/12mm-Mini-Small-Pocket-Button-Survival-Compasses-For-Camping-Hiking-Outdoor/264747275918?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2648

Bubble level
https://www.ebay.co.uk/itm/32-x-6mm-Diameter-Disc-Bubble-Spirit-Level-Round-Circle-Circular-Tripod-bullseye/402444058640?ssPageName=STRK%3AMEBIDX%3AIT&var=672584086868&_trksid=p2057872.m2749.l2648

Some bolts & nuts
https://www.amazon.co.uk/gp/product/B077HRPJRG/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Metal roller ball
https://www.amazon.co.uk/gp/product/B07MX7R5K7/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Washer
https://www.amazon.co.uk/gp/product/B07S8X7P73/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

x4 Pillow block insert bearing
https://www.amazon.co.uk/gp/product/B07QJYDVT7/ref=ppx_yo_dt_b_asin_title_o02_s03?ie=UTF8&psc=1

Steel rod 400mm - 8mm
https://www.amazon.co.uk/gp/product/B07MV83GXB/ref=ppx_yo_dt_b_asin_title_o02_s01?ie=UTF8&psc=1

The trouble I am having is geometry.... I am really not that good at it and I don't know how to go about building this thing. The more I search online the more complicated it seems. Does anyone have a clear guide?

Thank you in advance

Edited by varius21
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5 minutes ago, westmarch said:

Hi there,

good luck with your project.  What aspect are you having problems with?

John

Hi John, I don't know how to go about measuring and cutting the parts. 

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Just now, callisto said:

Sorry to but in....I would advise against the 12mm compass as its really tiny and hard to see where its pointing  😧

I opted for this one...works a treat  :)   https://www.ebay.co.uk/itm/UK-stock-Fast-delivery-Waterproof-Compass-for-Hiking-Military-Navigation/164483546713?epid=25033515336&_trkparms=ispr%3D1&hash=i

Thank you Callisto! I chose the small one because I want to stick it on the platform

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Just now, westmarch said:

Is it the wooden base you need help with or the aluminium arc segments?

John

What if I say it's both? xD I'm just very confused as I'm pretty bad at geometry.... 

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Posted (edited)
3 minutes ago, westmarch said:

Why don’t I pm you with the dimensions.  It will take me a day or so to work it out for your smaller 8” dob.

John

wow that would be WONDERFUL and you'd save me. If you could do that I would truly appreciate it.

P.S. my longitude is: 52.88

Edited by varius21
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  • 3 weeks later...
On 03/01/2021 at 20:45, westmarch said:

Why don’t I pm you with the dimensions.  It will take me a day or so to work it out for your smaller 8” dob.

John

Hi John,

Sorry to bother, but I don't suppose you could PM me a copy as well please?

Thank you.

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Hi there,

If you look on my original thread, towards the end, I have posted a pdf with full instructions on the build. Those instructions should work for an 8” Dob. 
 

John

Equatorial Platform Basic Guidelines.pdf

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