On Fri, 2014-02-21 at 12:16 -0500, Dave Cole wrote: > On 2/21/2014 12:01 PM, dave wrote: > > On Wed, 2014-02-19 at 21:26 +0000, Steve Blackmore wrote: > >> On Tue, 18 Feb 2014 20:59:08 -0500, you 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? > >>> > >>> Thanks for any advice from those who may have gone down this path before > >>> me; > >> Hi John - I had a Centec 2B with powerfeed and lots of horizontal > >> tooling. The important bits were tatty looking but in very good > >> condition under the grime. The X axis screw/nut design was pretty > >> appalling though. Getting the adjustment just right so it didn't jump > >> out of drive on reverse was a work of art. The table was heavy to raise > >> with lots of backlash in the bevel gears. I had the geared vertical head > >> too - that was very nice and had hardly been used. Some idiot had filled > >> the oil reservoir with grease and I had to strip it to clean. Getting > >> the bearing pre load correct after was difficult and I had to make a few > >> tools to do it. Fortunately the very expensive bearings were undamaged > >> and after fitting a new bottom oil seal it was fine. Guessing, I would > >> say that it leaked oil and to fix that they substituted grease! > >> > >> Although a very usable manual mill, I wouldn't attempt to CNC one. Not > >> an easy conversion. More importantly they are a bit "cult" over here and > >> fetch premium prices. I did renovate mine fully and repaint it before > >> selling it on and I made a hefty profit - you could buy a working second > >> hand Boss Bridgeport for what I got for mine! > >> > >> There are some details here. > >> > >> http://www.pilotltd.net/centec_2b_mill.htm > >> > >> please ignore rest of site - so out of date :) > >> > >> Steve Blackmore > >> -- > > Some years ago I put a servo on the W axis of my knee mill to > > substitute for a driven Z. At a geared half HP it was underpowered. > > I now have cobbled together a Z drive that is tight and repeatable. > > If I really wanted to fuss with it I would re-implement the W to set > > tool length, that way I would always have the full travel of the Z. > > At this point the Z has both a glass scale and an encoder just for > > confirmation and the W lives with a glass scale that has a display but > > no servo loop. > > Probably more than you waned to know. > > > > Dave > > Dave, > > Was your knee counterbalanced - for example: a Bridgeport Series 2 - or > not? > > Dave No. Just brute force. Cinci contourmaster ... tracermill.
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