Re: [CAD_CAM_EDM_DRO] Newbie - Help & Clarifications

Hi,

What you are asking questions about is only one way of establishing a datum
from which a part is machined, however there is another which does not use
homing switches.

If the edges of the blank are used as datum and then the G-Code is written
from this point then this datum would be the home position.

I do all my programming from this point and have no use for limit or homing
switches. In fact my lathe came with all the health and safety switches
required to make it almost idiot proof but I found them so annoying they
have all be removed or wired out. I have enough intelligence to know I can't
moved a slide into the chuck without some serious bit of flying metal.

The only time limit switches come into their own is when jogging the slides
outside of program control and holding a conversation at the same time.
Something I avoid.

Regards,

Terry


| I'm new to CNC
|
| I understand that the tool has to be homed to get a physical
| reference to the m/c in relation to which the tool will be moved.
|
| Is this done with a switch to which the tool has to be moved, and
| the when the switch closes, the tool is stopped & the position
| becomes the home position ?
|
| If the above is true , then what is the accuracy / repeat accuracy
| possible with home switches ? Are there any special switches
| available for this purpose ?
|
| Is there any other method for homing ?
|
| Are there any sites / books where I can get my basics of CNC -- like
| the question above ?
|
| Any help from all you so knowledgable people is welcome ?
|
| Biswanath