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

Hi Ballendo:
I agree with you 100%

Cheers

Marcus
-----Original Message-----
From: ballendo@... <ballendo@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Friday, January 12, 2001 4:45 PM
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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