cant_ride Posted April 6, 2005 Report Share Posted April 6, 2005 does anyone know all the basic equations for circular motion as i kinda missed the lecture. ie what would i need to work out questions such as the following ( dont need to know how to work it out just what formula i need ) "determine the optimum spindle speed of a lathe when a cylindrical piece of metal of diameter 10.7cm is being machined. The optimum cutting speed of the metal is 75m per minute" cheers oli Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted April 6, 2005 Report Share Posted April 6, 2005 ie what would i need to work out questions such as the following ( dont need to know how to work it out just what formula i need ) "determine the optimum spindle speed of a lathe when a cylindrical piece of metal of diameter 10.7cm is being machined. The optimum cutting speed of the metal is 75m per minute" ← You don't need a formula for that mate! Just calculate the circumference... and go from there (Y) Quote Link to comment Share on other sites More sharing options...
cant_ride Posted April 6, 2005 Author Report Share Posted April 6, 2005 do you mean just use the circumference as distance and then use the normal equations of motion? What about things like centripetal acceleration etc. ? would it be Vsq/r ? only thing i can think of Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted April 6, 2005 Report Share Posted April 6, 2005 do you mean just use the circumference as distance and then use the normal equations of motion? ← You dont even need equations of motion... Circumference = 0.107 x pi And then 75m/answer = RPM. Quote Link to comment Share on other sites More sharing options...
cant_ride Posted April 6, 2005 Author Report Share Posted April 6, 2005 You dont even need equations of motion... Circumference = 0.107/pi And then 75m/answer = RPM. ← great! but i didnt want the answer.... i needed the equations of circular motion if there are any .... such as centripetal accn. centripetal force that kinda thing ??? that question might have been a bad example.. i already had that answer but picked it randomly from a sheet ..hmm oli Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted April 6, 2005 Report Share Posted April 6, 2005 Ahh i see, probably best to Google it - http://www.google.co.uk/search?hl=en&safe=...+circular&meta= Quote Link to comment Share on other sites More sharing options...
cant_ride Posted April 6, 2005 Author Report Share Posted April 6, 2005 cheers Ad.. inspiration to invest in a mechanical science book methinks. oli Quote Link to comment Share on other sites More sharing options...
Heatsink Posted April 6, 2005 Report Share Posted April 6, 2005 Don't waste your money on books! All my Uni ones I barely read because they were'nt very readable and had too much detail. Best really is to gen up on subjects from different sources on the internet such as the ones Adam pointed out. So much easier for it to make sense when you can contrast two different explanations. Then if you want to find more worked examples, borrow some books from the library. In my experience I rarely want to use less than a few percent of the info in any sciencey book since there is usually too much irrelevant and in too much detail stuff. Steve Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted April 6, 2005 Report Share Posted April 6, 2005 In my experience I rarely want to use less than a few percent of the info in any sciencey book since there is usually too much irrelevant and in too much detail stuff. ← Prezunctly! Library me up (Y) (Y) ;) Quote Link to comment Share on other sites More sharing options...
tipsy Jock Posted April 6, 2005 Report Share Posted April 6, 2005 Prezunctly! Library me up (Y) (Y) ;) ← Librarys rock, I'm in my 2nd year of a history degree and have only bought one book! and that was on criminology lol ;) Two of my housemates on the other hand do business degrees and have paid up to £100 on 3 books (Y) Pete Quote Link to comment Share on other sites More sharing options...
Bonney@X-Street Posted April 6, 2005 Report Share Posted April 6, 2005 Here comes some avce engineering for you ;) you need to know what the metal is first as different metals have different cutting speeds eg. Mild steel cuts at 26m per min Brass cuts at 50m per min aluminium cuts at 100m per min to name a few The formula for working out rpm on a lathe is (c.sx1000)/(3.142xdia) eg aluminium that is 30mm wide (100x1000)/(3.142x30) = 1060 rpm ;) Hope this helps, Bon Quote Link to comment Share on other sites More sharing options...
cant_ride Posted April 6, 2005 Author Report Share Posted April 6, 2005 Here comes some avce engineering for you ;) you need to know what the metal is first as different metals have different cutting speeds eg. Mild steel cuts at 26m per min Brass cuts at 50m per min aluminium cuts at 100m per min to name a few The formula for working out rpm on a lathe is (c.sx1000)/(3.142xdia) eg aluminium that is 30mm wide (100x1000)/(3.142x30) = 1060 rpm (Y) Hope this helps, Bon ← ho ho i did AVCE engineering before this too. thats not really the stuff I need... I've already got all that stuff in my head... as I said its the stuff about centripetal forces and acceleration. thanks anyways. oli Quote Link to comment Share on other sites More sharing options...
trialsking 55 Posted April 7, 2005 Report Share Posted April 7, 2005 :lol: whoa my brain hurts trying to read that lol Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.