Re: [CAD_CAM_EDM_DRO] Re: mini-mill converson data kit ?

On Mon Jun 30 07:05:43 2003 kdntool wrote:

>Details Details,
>I plan to offer a full range from mechanics only kits right up to
>fully assembled and tested closed loop machines.
>
>Basic "Mechanics" Only Kit:
>
>Modified headstock mount casting with pre-installed 5/8" DIA ball
>screw & nut. (Non-preloaded nut as there is not enough room in the
>casting, however with the weight of the headstock on the ball nut
>backlash is not really an issue except on heavy plunge cuts)
>
>Y & Z axis thrust bearing housings w/ 2 ball thrust bearings per axis
>(utilize existing stock X axis thrust bearings)
>
>NEMA 23 motor mounts for all three axis' (NEMA 34 available on
>request although I am a little concerned about the weight of a NEMA
>34 motor on the X axis)
>
>New mounting plate for spindle motor relocation.
>
>Z-Axis pulleys and belt.(haven't tried direct drive)
>
>All necessary installation hardware.
>
>Advanced Kit will include:
>All of the above plus
>Modified saddle casting with pre-installed ball screws & Nuts.
>
>For Basic electronics I've chosen a Xylotex based driver/controller
>w/power supply, packaged in an enclosure with all necessary quick
>disconnect cabling, and (3) 180 oz/in double stack NEMA 23's. I will
>include the crossover cable to enable the use of EMC software if
>desired. Hell I'll include the two CD's with the BDI installation and
>all the settings I am using if you want.
>
>I am looking at the MAXNC closed loop package for advanced
>electronics until I design my own set-up. (subject to change)
>
>Prices?
>I am looking at @ $400.00 for the basic mechanics only kit.
>Basic electronics is in the $500.00 ballpark.
>Probably add @ $250.00 for the X&Y ballscrew upgrade.
>MAXNC Closed Loop is @ $875.00 directly from them.
>
>Harbor Freight Machine $500.00 (chosen for R-8 spindle)
>Basic Package $400.00
>Basic Electronics $500.00
>EMC Software $ FREE
> -----------
>Complete "MiniMill" CNC $1400.00 If you don't mind getting
>your hands dirty. Even less if you supply the electronics.
>CAST IRON DOVETAIL CONSTRUCTON WITH R-8 SPINDLE!!!!
>
>Full Basic Machine (stock x&y leadscrews) with basic electronics and
>IBM PII 400mhz loaded with EMC all set-up and tested= @$2300.00
>
>I am a Toolmaker by trade, with an extensive industrial automation
>background, so this is not some chop and hack kit. It has been well
>thought out and tested every step of the way. I am looking for
>feedback so please respond.

What sort of z axis are you doing? The conversions I've read about so far
require a little beef to be removed from the column in order to accomodate the
ballscrew. One guy was going to put together a bolt up kit that featured a
ballscrew mounted to the side of the column, but had binding problems in the
ways that required changing the ways to a different angle. I think he dropped
the project, as he subsequently vanished, taking his ball home with him.
If memory serves, that _may_ have been the Grizzly mini-mill though. It's
been a little while.

Bill


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