Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO

Well said - "combined effect of recession and deindustrialization".
I would add also devaluation of assets and making NA a province of China.
Alex

----- Original Message -----
From: Les Watts <leswatts@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, January 17, 2003 10:16 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO


> Dave,
>
> Yes of course the height mechanism would have to
> be anti-backlash. I think I mentioned a heavy spring
> preload (several hundred pounds). A preloaded inclined
> "channel" would require two bearings rather than one.
> That would add cost, but not from the bearings.
> They are almost free.
>
> The whole exercise is to get the cost and complexity
> down while keeping the profile very low. Stacking
> x on y on z could get out of hand!
>
> I agree that just articulating the mill z could be easier.
> In my opinion BY FAR the easiest cheapest way
> for a hobbyist to get quality cnc is to aquire an old
> Bridgeport (perhaps stepper) with burned out
> controls and retrofit it. I said aquire rather than
> buy, because the combined effects of recession
> and deindustrialization means often one can find
> these hulks for free if they look around enough.
> Steel "dumping" depressed the scrap metal market
> so much that the things often just sit there.
> It's a great time to get surplus big iron!
>
> But with this thread we are talking exclusively about
> a "bolt on and go" device that would work with any machine
> that has a spindle- and whether or not it is practical.
>
> Les
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
> http://www.alltel.net/~leswatts/wattsfurniturewp.html
> engineering page:
> http://www.alltel.net/~leswatts/shop.html
> Surplus cnc for sale:
> http://www.alltel.net/~leswatts/forsale.html
> ----- Original Message -----
> From: <david_mucha@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Friday, January 17, 2003 9:30 AM
> Subject: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO
>
>
> > Hi guys,
> >
> > murphreys law will show up pretty soon.
> >
> > if you are threading, the part/table will lift if not held in place.
> > ditto for drilling thru holes or uplifitng milling cutters. so now
> > you would also need antibacklash on your inclines. It would be much
> > easier to make the Z move.
> >
> > Dave
> >
>
>
>
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