{"id":400,"date":"2008-11-30T20:44:14","date_gmt":"2008-12-01T01:44:14","guid":{"rendered":"http:\/\/www.summet.com\/blog\/?p=400"},"modified":"2018-05-02T11:11:58","modified_gmt":"2018-05-02T16:11:58","slug":"bracket-assembly-skate-bearings","status":"publish","type":"post","link":"https:\/\/www.summet.com\/blog\/2008\/11\/30\/bracket-assembly-skate-bearings\/","title":{"rendered":"Bracket Assembly & Skate Bearings"},"content":{"rendered":"
\"Bracket<\/a>

Bracket & Bearing Assembly on Pipe<\/p><\/div>\n

I manufactured a second copy of my bracket<\/a> and used my hand drill to put a few holes in them to hold bearings. The idea is to mount 3 inline skate bearings at 120 degree increments around a pipe to limit motion to 1D (two of these on one side, plus two 2D mounts on the other side, make a Z-axis platform). I estimated the space taken up by the washers, and got it wrong, so if I wanted to use this design I will have to tweak my design and make a few “off-size” brackets to pair with the current ones I have. (Making all new brackets does not sound like fun, as each of them take almost 2 hours of routing time). The alignment and motion is a bit rough (I did eye-ball the holes) but I think I could improve upon that enough to make them passable with enough practice. However, due to the two-hour build time, I’m seriously considering using the “standard” angle-iron solution for my Z-axis.
\n
\nI harvested the bearings you see (and all the hardware that isn’t wood) from a pair of in-line skates I purchased at a Goodwill store for one dollar. They are ABEC-3 bearings (which are not as good as ABEC-7) but for $1 I got 12 bearings (2 per wheel, the skates had 3 of the 4 original wheels), hex bolts and associated plastic sleeves. They are standard skate bearings (8mm ID, 22mm OD, 7mm width) but much cheaper when obtained used.<\/p>\n

Below are a few photos and a 4xSpeed video of the manufacture of my 2nd bracket (which doesn’t have as much burnt wood, and no problem areas):
\n\"\"<\/a> <\/p>\n

\"\"<\/a><\/p>\n

<\/object><\/p>\n","protected":false},"excerpt":{"rendered":"

I manufactured a second copy of my bracket and used my hand drill to put a few holes in them to hold bearings. The idea is to mount 3 inline skate bearings at 120 degree increments around a pipe to … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,2],"tags":[],"class_list":["post-400","post","type-post","status-publish","format-standard","hentry","category-projects","category-technology"],"_links":{"self":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/400","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/comments?post=400"}],"version-history":[{"count":1,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/400\/revisions"}],"predecessor-version":[{"id":4607,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/400\/revisions\/4607"}],"wp:attachment":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/media?parent=400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/categories?post=400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/tags?post=400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}