So, these mutual fund companies outsource the work related to such back-end transaction to RTAs who have expertise in maintaining such data on a professional basis. Every such action is a complete transaction in itself and can be burdensome for mutual fund companies. All these changes done by investors are carried out frequently and have to be accurately recorded. Role of RTAs:- Mutual fund investors carry out numerous transactions, such as buying and selling of mutual funds, switching funds, redeeming mutual funds or updating personal information (e.g., contact details, email id). As to the better material selection achieved using the built up system i think at GM about 1/2 of the cams are built up and the rest are still cast.Definition:- Registrar and Transfer Agents (RTAs) are institutions formed to register and maintain detailed records of investor’s transaction on behalf of Mutual Fund Houses and for their convenience. Even the built up cams must be finish ground after they are assembeled. Now i realize all this is past the question at hand but it does illistrate the issues that a real machine builder goes to to do cams using CNC.īy the way at GM the cams for their production engines are ground using a belt sanding system and not conventional grinding wheels. Has hydro-dynamic ways.a exact engineered way system where the wheel head floats on hihg pressure oil to eliminate the stiction of conventional ways.the spindle uses a 24" wheel (Borazon) and has a hydrodynamic spindle to help with surface finish with 60 horsepower. Has no ball screws rather linear motors to allow the rapid direction change of the wheel head. has one of their current machines (cost about a million $ new) Uses two controls.one for the program and one to run the machine. Guy down the road does cam development work for Honda, Gibbs Racing etc. Landis tried the conventional ball screw route and gave it up. Lots of discussion here about the ease of making a cam grinder using CNC.well it has been tried and conventional systems really don't work but fro very short times. Just looked at this thread and although it is sort of old thought i would give my 2cents worth. Jr nice point about the contact line, it could be removed by software but the wheel diameter would have to be measured from time to time and entered into the software. By converting a cam profile to points you introduce sampling errors and aliasing errors when you convert back. I disagree that the software side is not trivial, I doubt the motion part would be more than 50 lines of C, no point interpolating points, just generate the cam straight from the motion equations, which is the best way of keeping valve accelleration and motion near their optimium. The work head needs a good smooth backlash free drive though, a poor drive may benefit from more encoder resolution.Ī fine resolution scale on the wheelhead would close the postitioning feedback loop. CarbideBob, I dont see the need for very high resolution on the workhead, the motion frequency spectrum of the part being generated is quite low ( one lobe per rev + the higher order components) My bet is a 4096 ppr encoder would be ample As the time variance of the workhead encoder count is pretty much constant the computer clock can generate intermediate points anyway.
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