Hoss did it on his X2 Mill Link To Project
if you have been in a grinding shop,you may have saw one.the ides is to run a sort of 2d milling operation with the "z" axis making a stroke up and down every few tenth's of a thou around your part(over and over all the way around the part) this may be outa league for a diy home built machine but i got to thinking about it the other day....and it led me to think of grinding on a home brew machine ..maybe even on a dremel tool with a stone in the spindle or even one of those cut off wheels, of course it dont have to be you guys with dremels doing the work,,,any type high speed spindle could do it.....so my question ....has any one tried cnc grinding on their machine? either like a jig grinder or otherwise running a profile with a dremel.or other larger spindle porter cable,ryobi,etc.,etc,..(we had a cnc jig grinder at work one time..which can do some very precision form grinding ...got me to thinking bout home brew jig grinding or machine grinding...) any one ever done any thing like this on a home brew??
thats pretty neat..but not quite what im refering to...on a normal jig grinder...the "wheel" rotates the same way a normal cutting tool would in a spindle..but at speeds more like 50,000 rpm,and instead of a cutter it is common to use diamond coated "grinding pins" there is only 2 axis of movement,the "z" axis is more of a up and down stroking motion...up and down 3 to 4 times a second..so its not for grinding on the bottom of a part at all...so i suppose the up and down motion using a stepper would be to slow,..and better handled by an air cylinder and relay maybe...also the up and down starting and stopping point is usually not very critical ,it is the form that is the most important ,where i worked we could run around a part and hold very tight tolerance...but as you can emagine there are small "lines" up and down its a little hard to explain...i was more wondering if any one had used a "cut-off" type arbor and wheel to do any grinding around a profile,maybe like grinding slots around a form like cooling slots on a air cooled model airplane engine,as these slots are pretty small...thought grinding them maybe the best way of doing such a thing..as you would have to run pretty slow,and constantly change your cutter "diameter" in the program to adjust for grinding wheel wear...i dont really have a project to do i was just wondering if any one may have tried such a thing...still a pretty cool projact hossman done tho...
Interesting adaption. When surface grinding, the finish will be much improved if you increase your feed substantially and decrease you step over substantially. .010-.020 step overs, and 100ipm feeds.