Re: [CAD_CAM_EDM_DRO] Re: get yourself a better rig
Posted by
Marcus & Eva
on 2001-10-29 08:32:09 UTC
Hi Johnno:
I'm looking over your latest post that describes a bit of what you are
trying to achieve, and I think it's a bit beyond what you can consistently
expect from a lightweight machine like an Emco 5 CNC lathe or an F1 mill.
When you talk half thousandths with such a flimsy starting point, I'm
surprised that it's working at all!!
When I went from a stepper driven Sherline to a servo driven commercial CNC,
I immediately noticed a MAJOR improvement in what I could cut easily and
accurately.
This is not to suggest that it can't be done on a homebrew rig, but if your
focus is on making accurate parts, rather than forever diddling the setup,
you will probably be pleased and relieved as I was, when you just bite the
bitter pill, and spend the bucks for a commercial rig.
Just my two cents worth.
Cheers
Marcus
otherwise I have to re zero the machine.
I'm looking over your latest post that describes a bit of what you are
trying to achieve, and I think it's a bit beyond what you can consistently
expect from a lightweight machine like an Emco 5 CNC lathe or an F1 mill.
When you talk half thousandths with such a flimsy starting point, I'm
surprised that it's working at all!!
When I went from a stepper driven Sherline to a servo driven commercial CNC,
I immediately noticed a MAJOR improvement in what I could cut easily and
accurately.
This is not to suggest that it can't be done on a homebrew rig, but if your
focus is on making accurate parts, rather than forever diddling the setup,
you will probably be pleased and relieved as I was, when you just bite the
bitter pill, and spend the bucks for a commercial rig.
Just my two cents worth.
Cheers
Marcus
otherwise I have to re zero the machine.
>since the emco resolution is .001 I can't get coser than a 1/2 thou underit
>best circumstance. Here is something else I learned. I tried to just barely
>touch up the tool bit while it was in the turret by kissing it with a
>diamond lap. just one or two strokes, If those are even barely off I will
>drag the backside of thepoint of the tool when it the code of the radius is
>changing at one point from a G01 to a G03, there is a .010"G01 travel in
>Z&X. The it finishes the ball end(see my website for a picture of what it
>I make for clarification) anyway thaat moment of going from G01 to G03 can
>leave the backside of the tool dragging and reshape the entire profile of
>the ball. So the nose radius has to ewither be perfect every time I grind
>the bits or I have to adjust the program to avoid the tollnose dragging the
>backside down the G03. DiD I lose you on that one? It took me a year to
>figure out the best way was to have a tool that was working perfect to
>prduce the parts to spec, well I sent them to a shop and had 40 of them
>custom ground so when they break I just put a new one in, saving the others
>for a new run.