On 02/18/2014 07:59 PM, John Alexander Stewart wrote: > Hi all; may be off topic, but am wondering about converting my Centec 2B > mill to CNC. X,Y axes are relatively easy; Z is difficult. > > Is there any real need to convert the Z axis, assuming that the weight of > the table will keep the backlash to a minimum, or am I way off base here? > Is this a horizontal mill? That's what I get with a search. The left-right table is still the X axis, but the Z is the toward/ away from the operator, as it is parallel to the spindle. The knee crank is the Y axis. This is necessary to make the axes follow the right hand rule. On some old machines, the rocking of the knee can cause it to bind and not always drop when the crank is lowered. If that doesn't happen, then the only thing you need to worry about is backlash on the bevel gears of the elevating crank.
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