Post by Laz
Thank you Jan and Cliff;
The reason I was asking is that I
recently interviewed for a cnc setup/operator/programmer position where the
mgr said they don't use edgefinders to locate their parts- instead used
indicators- he did not elaborate beyond that and I figured that if I got the
job I'd learn ( and I was hoping to do just that ), unfortunately....
Here are the relevant parts of a post I made in 2001.
Edge finders: I sometimes see experienced machinists wasting
creeping up on an edge finder as if making them kick out was damaging to
them. Just blast in with the advance button/knob set to .01, when it
kicks, back off - change to the .001 setting blast in again, when it
kicks, back off - change to the .0001 setting blast in till it kicks,
back off - THEN creep in.
Indicating Vises/angle plates/whatever: I see people setting
indicator to zero on one end of the vise and then cranking to the other
end - make an adjustment - then crank all the way back - make another
adjustment, etc. etc. What I do is snug one bolt and start cranking on
X and as soon as the indicator moves start making adjustments WHILE I'm
cranking. When you get the hang of it, it should take no more than one
pass to align it - then tighten it - and then a final check pass.
Indicator sweeping for center: I've seen people sweep one side
block then the other - then back - and forth - and back - etc. I set my
indicator sweeper a little larger than the block on both ends - move the
block/table against the indicator and zero the indicator - then zero the
axis. Bring the indicator down on the other side of the block - move
the block/table against the indicator till it reads zero - check what
your axis readout says - divide it by two and move over that amount.
Then reset your indicator to read zero against one side of the block -
and then bring it up and down on the other side. You should be pretty
close, make any fine adjustments necessary. It takes longer to write
about it than it does to actually do it. <g>
If you want zero to be on one edge of the block rather than
just measure the block and move half that amount and reset your part
Here's the original thread name if it might be helpful:
Local: Sat,Jan 6 2001 5:57 pm
Subject: Re: Setup Tips