EEZYbotARM MK2 with ball bearings joints/extended limits

thingiverse

I printed the EEZYbotARM MK2 version remixed by sthone (https://www.thingiverse.com/thing:4632254) that offers a greater range of movement compared to the original EEZYbotARM MK2 by daGHIZmo (https://www.thingiverse.com/thing:1454048). However, I wanted to have less wobbling movements, so I redesigned a version of this arm with cheap ball bearings. It makes the whole arm more rigid and easier to move for the servos. To make this arm, you will need 15 MR63 bearings and a set of 35 mm long, 3 mm in diameter steel shafts that will need to be cut at the correct length during assembly (a set of 20 shaft is more than enough). I advise you to use more powerful servos than the 995 or 946 servo used in the original design from daGHIZmo. The plastic gears break easily (I broke 2 servos) if your arm hits hard limits. I used 25 kg Chinese servos with metal gears and everything works fine now. For the base servo, I used a winch servo that is able to make 4 turns so that my arm can at least rotate 180° on the base. You will need to cut the plastic pieces that are around the servo shaft. They are easy to find on Aliexpress. Finally, I designed a 3d printable servo arm that eliminates the wobble between arms and servos. It may need a bit of sanding before assembly, but it will really help to improve the precision of the arm. Here are affiliate links to buy the listed parts (it doesn't cost you extra money and it helps me in my work) : Aliexpress : (Links will be uploaded later) MR63 bearings : 35x3mm steel shafts : 25 kg servos 180° : Winch servo : Amazon : MR63 bearings : https://www.amazon.fr/Roulements-Roulement-Billes-Rouelements-Imprimante/dp/B07CLLY912/ref=sr_1_8?keywords=mr63zz&qid=1685961041&sprefix=mr63%25252Caps%25252C646&sr=8-8&_encoding=UTF8&tag=lucius140-21&linkCode=ur2&linkId=afb4af438dfac88abd14c717eb497c83&camp=1642&creative=6746%22 160x3mm steel shafts (5 pcs) : https://www.amazon.fr/diam%25C3%25A8tre-acier-inoxydable-Transmission-tiges/dp/B00OK6GKPE/ref=sr_1_1_mod_primary_new?__mk_fr_FR=%25C3%2585M%25C3%2585%25C5%25BD%25C3%2595%25C3%2591&crid=2PYRJ9WA27GZO&keywords=axe+diam%25C3%25A8tre+3mm&qid=1685961489&sbo=RZvfv%252F%252FHxDF%252BO5021pAnSA%253D%253D&sprefix=axe+diam%25C3%25A8tre+3m%252Caps%252C322&sr=8-1&_encoding=UTF8&tag=lucius140-21&linkCode=ur2&linkId=7d7d50dd9fc99f44d61e2914753e577b&camp=1642&creative=6746 25 kg servos 180° : https://www.amazon.fr/Innovateking-EU-Servomoteur-num%25C3%25A9rique-Enti%25C3%25A8rement-m%25C3%25A9tallique/dp/B08BZNSLQF/ref=sr_1_10?keywords=25kg+servo&qid=1685961754&sr=8-10&_encoding=UTF8&tag=lucius140-21&linkCode=ur2&linkId=146e0926e639169e80f4951b7ca6245a&camp=1642&creative=6746