So you need a little help learning how to do lever problems, huh? Below are a bunch of of videos that show how to do the problems in the Levers & Wheels presentation, step by step. Watch it once, or as many times as you like. Please let me know if you have any questions!
1 POE Levers: Effort & Moment
2 POE Levers: Calculating Resistance Force
3 POE Levers: Calculating AMA & IMA
4 POE Levers: Calculating Lever Efficiency
5 POE Levers: Calculating IMA Wheels
6 POE Levers: Calculating AMA & Efficiency of Wheels
Short answer: very accurate. To 0.007″ to be exact. Verified by an independent study student of mine using statistical analysis.
In May of 2017 I purchased a Dobot Magician from an Etsy shop, as that was the only way to get them at the time. It is now available at In-Position Technologieshere for $1499.00. Use the code “chrisandjimcim” or mention us on your PO and you will get free shipping as well as US based help and warranty service!
First thing I did, and when I say I, I mean an Independent Study student (props to Vincent Paglia , who will be going to RPI in August, see his info below!) was do an Accuracy test. They claim it is accurate to 0.2 mm, and our test on our robot proved that it was actually more accurate than that. Try that with the robot you use for CIM class now! The only one more accurate in my classroom is my Fanuc, and it cost almost 15 times what the Dobot cost!
For those of you into POE and “data” you can you download the spreadsheet with data points, graphs, ect here: 2017 Dobot Repeatability Data. But this histogram says it all:
When all was said and done, our robot was accurate to about 0.18mm overall. That is 0.007″ for those of you in England… I must say, very impressed with the accuracy.
Special thanks to one of my best ever Independent study students for all of the work he did this year with me with the Dobot. Vincent Paglia, son of Thomas and Regina Paglia, has been awarded a scholarship from SME. He plans tostudy engineering at Rensselaer Polytechnic Institute in the fall. Vincent has played varsity and JVsoccer; has played hockey at Center State for four years at the bantam and midget levels and for thehigh school as a senior; and is also a member of the Tech Club and National Honor Society. He receivedthe Rensselaer Medalist Award for outstanding achievement in math and science in 2016 and was also aScholar-Athlete by the New York State Public High School Athletic Association (NYSPHSAA) while playingsoccer and hockey.Continue Reading