|MadSci Network: Engineering|
Hi knowlegeable ones, I wonder if you can help? About 1year ago I built a wimshurst machine using 400mmD X 2mm thick acrylic disks. Aluminium foil segments, earthing brushes and 2 leyden jars all according to accepted construction methods. At the start it worked unbelieveably well.It would throw good 125mm sparks and hold its charge for 24 or more hours in times of low humidity weather. If it did discharge I would rub briskly a thin sheet of polyprop, put it between the two disks wind the handle and it would start every time. Now comes the problem. After some 6 months it became slugish starting, would not throw sparks more than 15mm, and discharged after about 10 mins. I notice that the insides of the disks are dull due to the rubbing action of my starter sheet. It may be that this has caused the disks to become slightly conductive. I have taken the precaution of washing down the disks with detergent and copious quantities of water to make them immaculately clean in case they have acquired a film of grime and all to no avail. Has someone out there got any ideas? My web site contains a page describing this machine. http://home.cyber.net.au/~grahamej Cheers and thanks Not so knowlegeable one Grahame Jeffery.
Re: Questions about wimhurst machine
Try the links in the MadSci Library for more information on Engineering.