RE: [CAD_CAM_EDM_DRO] re: backtrack gantry mill was: Re: re:Re: What is everyone doing...

Ballendo,

Making a rough guess from the last time I looked at the Sherline parts price
list I would think you are looking at aroud 350 to 400 dollars worth of
lathe beds, lead screws, carriages etc. It is an interesting concept but I
sure would not spend 6 grand for one of these.

John

> -----Original Message-----
> From: ballendo@... [mailto:ballendo@...]
> Sent: Friday, January 12, 2001 7:44 PM
> To: CAD_CAM_EDM_DRO@egroups.com
> Subject: [CAD_CAM_EDM_DRO] re: backtrack gantry mill was: Re: re:Re:
> What is everyone doing...
>
>
> Marcus wrote:
> >Hi Ballendo;What did you think of that Backtrack gantry mill?
> >Looks awfully flimsy to me!! Brutal price too!!
> >For 6 grand, I would hope for something a bit more substantial
> >mechanically.
>
> Marcus,
>
> I think it represents some innovative use of some CHEAP, STOCK
> Sherline components... Anyone could probably bolt one together in an
> afternoon, maybe take a weekend... Tools needed(for the mech. assy);
> drill& bits, countersink, or counterbore, allen wrenches, file.
>
> It's is probably stiffer than it at first appears; but certainly is
> not a bridgeport!
>
> The X axis is 2 s/l 'lathe' beds bolted to an alum plate.
> The 'saddles' carry 2 mill support blocks. At this point the 'flex'
> will be that of the saddle/dovetail. The support blocks are "bridged"
> by a third 'lathe' bed (looks like the 4400) which forms the gantry.
> From here you are dealing with the 'flex' of this bed and the
> typical "gantry" machine 'buildup' of tolerances affecting stiffness.
>
> And the 20tpi leadscrews might be limiting to top speed, but I keep
> remembering Dan M's post about the BLAZING 'gecko' sherline!
>
> Would I buy it for 6 grand? No. But I might call sherline to see what
> I could build it for... And THIS is why I posted the link...
>
> Hope this helps.
>
> Ballendo
>
>
>
>
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