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

On Mon Jun 30 04:03:49 2003 kdntool wrote:

>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
><davemucha@j...> wrote:
>> Hi,
>>
>> I am looking for data on converting a mini-mill to steppers.
>>
>> can anyone offer some links ? or recomendations on stepper sizes ?
>>
>> I was thinking of starting with some NEM34's 150 in-oz because I
>have
>> them and could always swap out for larger units.
>>
>> Also, what is the best way to automate the Z axis ?
>>
>> Dave
>
>Dave,
>I just finished the conversion on a "Grizzly" type with the R-8
>spindle. A ball screw for the Z-axis is the only way to go. I am
>running a 180oz NEMA 23 with a 2:1 pulley ratio. Direct drive on the
>X&Y axis'. Rapid rates are 24 IPM--Z and @13 IPM X&Y.(until I ball
>screw them as well)(would also improve with higher voltage drives)
>Not finished fine tuning EMC yet so they might get even better! I did
>a jig for work with it: 1st piece:50 holes .035 DIA, 5/16" THK 6061,
>w/ 2 .187 dowel holes 2nd piece: 50 holes .024 DIA, 1/8" THK O-1
>flat ground, w/ 2 .187 dowel holes. I used solid carbide "circuit
>board" drills with the spindle running flat out, no broken drills
>even with the "slow" spindle speed. Had to "peck" .015" deltas
>through the O-1. Both pieces line up perfect. I will be going to
>market with the retro kit soon if you are interested? Just waiting
>for another saddle to arrive so I can finish the ball screws for the
>X&Y.
>Good Luck with your upgrade it yields a nice little cnc for small
>parts.
>Ken

Yo Ken;

Are you talking about a conversion kit for the mini-mill? If so, what are the
details?

Bill


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