Originally Posted By moparx
Originally Posted By RAMM
Originally Posted By AndyF
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So it doesn't take a huge machine,Yes it does and you know it. It takes an abnormally large Z axis or a 4th axis but then you get into "Sag" it just takes a good machinist who pays attention to the setup<<Yup this is the key right here and gets the block properly fixtured and indexed.


Andy you're a CNC guy as am I. I use a MAZAK Integrex 1850-V 5 axis and have built block fixturing for what can be considered one setup block machining. Still the cam bore and main bores are an issue. Everything will need a lick with a hone to become true round. Horizontal boring is not near as accurate as vertical unless using a piloted arbor. That right angle drive bore head will not be accurate . As you have pointed out a machinist never likes to break setup. Well it still takes a vigilant machinist as CNC's can do wrong. In fact I was chasing tolerances all over until I tracked it down to a worn X-axis ballscrew. It was worn .024" . $30k repair.... It takes a BIG RIGID machine with power to produce (whether it be accuracy or volume or both). J.Rob


absolutely ! see what happens if a wrong tool is picked up. the fun begins there, and if not vigilant, "stuff" happens in the blink of an eye or quicker. then you hear that "expensive" sound.
rigidity of the machine and fixturing is the key to producing quality parts, as well as sharp [and correct for the task] tooling.
along with worn ballscrews, worn tooling spindles can cause one to sometimes tear his hair out until the problem is found and corrected.
in the CNC machining field, bigger [and more powerful] is usually better, especially in high production.
just my opinion from over 42yrs in this trade.
beer


^^^^^This guy gets it. The RMC pictured will get its [censored] kicked in a production environment. One off OK no problem.

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