[fayysl]

I am preparing feasibility study to buy/use CNC machines and want to prove that CNC machines are much better than conventional machines. is there anyone who have the data of parts machined previously on conventional machines and now being machined on CNC machines.

[Algirdas]

that's cool. nothing to say.
Can you mark in your study, that on CNC is easy to produce some parts, what is totally imposible by manual?
Next - repeatability of dimensions and accuracy.

[Geof]

It is not easy to come up with a simple answer to 'prove' that CNC is faster. I did the transition from manual machines to CNC in my business starting just over ten years ago and I know that CNC is much more productive per employee, but I don't have the data to directly compare the two. You can read these threads where I describe some of the advantages of CNC. Definitely a big advantage is that you can machine shapes that are difficult if not impossible to do on manual machines as Algirdas mentions.

But it is not just switching to CNC that provides the best improvement in productivity it is also designing fixtures, programs and work procedure to utilize the CNC machine effectively. This aspect is mentioned in my threads.

http://www.cnczone.com/forums/haas_m...y_my_shop.html

http://www.cnczone.com/forums/haas_m...fixturing.html

http://www.cnczone.com/forums/work_f...fixturing.html

If you have any specific questions I may be able to answer them.

[RICHARD ZASTROW]

The parts to be machined can have a great effect on the type of machines employed to produce them. There is little advantage to a CNC lathe when making long, straight cuts as in roll turning, or long boring cuts.

CNC lathes can become very advantages when the work is more complicated.

Comes back to the old "workpieces to be machined determine the machine to do it".

Dick Z