2014-05-29 6:34 GMT-03:00 andy pugh <bodge...@gmail.com>: > The relationship between follower radius and cam lift / profile is > properly complicated. > The master cams you have may well have been made assuming a specific > follower radius. If the master follower, the grinding wheel and the > engine-as-installed follower are the same radius then it is easy, > otherwise there are two sets of corrections to apply. > > Machining a cam for a bucket follower with a lathe tool means > correcting for infinite radius in the engine and zero radius in > manufacturing. > > I looked at the equations in a book once. But I have never made a cam > for a purpose (I just set up the lathe to prove that I could) >
Thanks for clarifying the point Andy. Indeed it's a complicated job to get the relation based only on the shape of the profile. Anyway "in theory" the approach of the knife edge follower with radius almost 0 it's likely to work for me. Making the simulation in Solidworks shows that it works. In real life I expect a few hundredths of error in displacement. The main thing is that I need the pure displacement form to reproduce it as is, with the cutter radius compensation. Simulating it, I get good results in theory. It's impossible for me or anyone who reproduces camshafts to study the behaviour of all the followers for every camshaft model. Specially the ones that have pivoting followers. I hope in the next weeks to test this approach with a grinder that we have working with steppers for the X axis. It's going to be slow because of the reduction but it's a beggining to see if this works. If I have some progress I will upload some videos! -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Time is money. Stop wasting it! Get your web API in 5 minutes. www.restlet.com/download http://p.sf.net/sfu/restlet _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
