i have had a machine job shop for twenty plus years with most of my work being non cnc. i came across a production job from one of my customers machining small aluminum wings. a friend of mine does the 3d programming with bobcad software. the original software was mine but as we went along we split the cost of the upgrades for better 3d toolpaths. all the cnc equipment and related tooling belongs to me. he has helped me on two mills to update the control and drives to something a little more modern. all expenses were covered by me. to run these parts we use my ez-trak, older bridgeport and hurco cnc knee mills that were retrofitted and fairly new milltronics cnc mill. we both run the parts but do not keep track of individual hours. he worked more hours initially but now i run more parts per hour. what is a fair way to split money in a situation like this. i have no payments on any equipment but have to consider wear and tear because we are working the Y and Z axis pretty hard doing 3d with a small step over with a ball mill turning pretty fast. what percentage should be set aside to cover machine replacement, three of the mills are only used for this work. should other things like utilities, end mills, cutting and way oils, air compressor wear and tear be divided evenly and what percentage for dividing profit? i know this is a tough question but i am just asking for your opinion so i can be fair to both of us.
thanks
keith
thanks
keith