{"id":378,"date":"2008-11-29T21:12:34","date_gmt":"2008-11-30T02:12:34","guid":{"rendered":"http:\/\/www.summet.com\/blog\/?p=378"},"modified":"2018-05-02T11:07:57","modified_gmt":"2018-05-02T16:07:57","slug":"cnc-first-25d-cutting","status":"publish","type":"post","link":"https:\/\/www.summet.com\/blog\/2008\/11\/29\/cnc-first-25d-cutting\/","title":{"rendered":"CNC – First 2.5D cutting"},"content":{"rendered":"

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\nI have designed a bracket that I used as my first attempt to manufacture something with my CNC mill. Because I’m still using python code I wrote myself and have not yet calibrated my stepper coordinates into real-world measurements, I had to design the bracket in Inkscape, print it out, and manually move my router bit to each point to determine the stepper coordinates along the path I wanted to cut out. This really sucked, and I plan on switching over to the parallel port controller board and EMC2 very soon so that I do not have to keep writing code. (I had to add code to cut out the bracket<\/a> that interpolates between two endpoints so that I could route semi-accurate 60 degree lines.)<\/p>\n

The piece of wood was secured to my sacrificial base with two wood screws, which worked out quite well. I am using a Black & Decker RTX rotary tool (low setting is 12,000 rpm) which is a relatively high powered tool, not the type of thing you buy at harbor freight for $10. Even so, my X\/Y table moved too fast for it (causing my Dremel Drill press mount to be pulled out of alignment <\/a>, as well as some damage to my bracket in a non-critical area). <\/p>\n

\"\"<\/a> So much for thinking that my rate was too slow<\/a>! So I slowed the motion of my X\/Y table by a factor of 2 and tried again. By only lowering the bit 1\/32nd of an inch at a time I was able to cut out the wood without too much smoke and with a good deal of accuracy. <\/p>\n

Needless to say, this was a LONG procedure. Each lap around the bracket took over six minutes, and it took about 25 of them to cut out the piece of wood. Once I got greedy and tried to do more than 1\/32nd of an inch and knocked the dremel out of the holder with the extra pressure, so after re-calibrating to the starting point I sat down for the long haul. The entire procedure took around two hours. This makes me want two things: 1) A working Z-axis, so the computer can lower the dremel 1\/32nd of an inch each time around without me, and 2) A much stronger spindle motor (trim router?) so I can cut out wood parts faster!<\/p>\n

Wife Acceptance Factor (WAF): <\/strong>
\nThe noise (especially when I was mistakenly using the 30,000 rpm setting instead of the 12,000 setting) was very loud, and the wife and cat ran upstairs to escape from it. After I was done, she noticed one good thing about the wood smoke I had produced. “[the smell] Makes me think I’m in a log cabin, [with a] burning fireplace.” If I want to transplant this device to my office, I am definitely going to need a sound dampening enclosure. (Also needed if I want to keep it at home.)<\/p>\n

Below are a few pictures of the part and mechanism, as well as a movie of the cutting procedure in action:
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I have designed a bracket that I used as my first attempt to manufacture something with my CNC mill. Because I’m still using python code I wrote myself and have not yet calibrated my stepper coordinates into real-world measurements, I … 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":[56,60,58,59,57],"class_list":["post-378","post","type-post","status-publish","format-standard","hentry","category-projects","category-technology","tag-cnc","tag-diy","tag-dremel","tag-homebrew","tag-router"],"_links":{"self":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/378","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=378"}],"version-history":[{"count":1,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/378\/revisions"}],"predecessor-version":[{"id":4602,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/378\/revisions\/4602"}],"wp:attachment":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/media?parent=378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/categories?post=378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/tags?post=378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}