Crow killer Posted February 29, 2004 Report Share Posted February 29, 2004 I am making a pigeon magnet for my GCSE in DT and am wandering on your view of the best arm lengths. Any help would be appreciated!!! Crow Killer PS I am hoping not to get an anti examiner!!! Quote Link to comment Share on other sites More sharing options...
bobthenailer22 Posted February 29, 2004 Report Share Posted February 29, 2004 it all depends on how thick your arms are going to be. best bet is to play around with the arms not forgetting to allow wieght for the pigeon and cradle. mine are made from 5.5mm steel rod and are 5ft long. they are long enough to bounce but not too much if that makes any sence. ive not got a digi camera but i will try to borrow one to take some pics it may help you in your build. BOB Quote Link to comment Share on other sites More sharing options...
billm Posted February 29, 2004 Report Share Posted February 29, 2004 crow killer, have a look at sean johnstons pics 24th feb 2003 Quote Link to comment Share on other sites More sharing options...
webber Posted March 2, 2004 Report Share Posted March 2, 2004 crow killer As an ex teacher of cdt, I may be able to give you a few pointers, although I regret that I cant advise as to the best length, as I dont think that there is one. Simply an optimum length for the crop and wind conditions. I suggest that you research some of the proprietry products and investigate what they do. Your examiners will be looking to see that you have thought about the problem, and what solutions that you came up with, and reasons as to why you chose your final option. You will need to consider differnt materials, methods of jointing, methods of adjustment, and application of finish to name just a few. Remember that with these school projects the paperwork is equally important to making the product. I made my own arms from 6mm mild steel, spring steel would be better, but like your school we didnt have any in our stores and I was impatient. it is many years since I tought in a school, I moved on to be a college lecturer and set up my own company when the college closed. Good luck and keep the forum and me posted with your progress. webber Quote Link to comment Share on other sites More sharing options...
red_stag88 Posted March 2, 2004 Report Share Posted March 2, 2004 Are you using a windscreen wiper motor to power it? Quote Link to comment Share on other sites More sharing options...
Crow killer Posted March 8, 2004 Author Report Share Posted March 8, 2004 Yeah I am using an old windscreen wiper motor and one of those long life orange 12 volt batteries. What is the best solour to spray finish it with? Thanks for the help Crow killer Quote Link to comment Share on other sites More sharing options...
Jonnyni Posted March 8, 2004 Report Share Posted March 8, 2004 Nato Green (matt) paint Quote Link to comment Share on other sites More sharing options...
crookie Posted March 11, 2004 Report Share Posted March 11, 2004 What is the best type of steel to use for magnet arms (the round bouncy section)? I have a steel stockist over the road from where I work but he wants a code or spec for it, also what diameter shoud it be ? Quote Link to comment Share on other sites More sharing options...
tody27 Posted March 12, 2004 Report Share Posted March 12, 2004 Crookie Most home made rotarys are made from mild steel. If using this metal then I would say your arm diameter needs to be about 10mm tody Quote Link to comment Share on other sites More sharing options...
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