On Thursday 13 June 2013 10:37:21 Mark Wendt did opine: > On Wed, Jun 12, 2013 at 7:43 PM, andy pugh <bodge...@gmail.com> wrote: > > I already have a CNC lathe, though I mainly use it for one-off and > > experimental style work. In fact the CNC aspect for me is mainly an > > extension of conventional power feed that returns to the start point > > and takes another cut until completed. I do 95% of the things I do on > > the lathe just using the same 6 macros. > > > > So, I have concluded that what I need is a conventional lathe, with a > > large spindle bore, a set of rests, and that will fit in a small > > space. In fact what I need is probably a Harrison M250, or better > > still the M280 CNC trainer version. > > > > I only really bought the Rivett because they have fascinated me since > > I saw them on the lathes.co.uk page. I paid £120 for it, which at the > > moment isn't a great sum of money to me. I spent £99 on a ballscrew > > for my milling machine only a week ago. > > > > However, I do want to make the Rivett useful and usable again. It was > > bought as "for parts or not working" and I am determined that it won't > > leave me in the same state. > > It needs a motor and drive system, and underdrives always look neatest > > to me with the flat-bed lathes, so that is decided. > > > > I don't have any of the changewheel or screwcutting gearbox parts > > (other than the quadrant). Finding the parts seems unlikely, certainly > > at a sensible cost. > > > > What would make a lot of sense would be to replace the original > > changewheel arrangement with an electronic leadscrew drive. (this > > could easily be a second motor inside the cabinet, and a toothed belt > > drive, and would be effectively invisible. This could be nothing more > > than an Arduino with an LCD display. Add three gear-tooth sensors > > inside the backgear cover, and the machine suddenly becomes quite > > useful. (Though I am also short of a threading indicator) > > > > > > -- > > atp > > If you can't fix it, you don't own it. > > http://www.ifixit.com/Manifesto > > Here's what a Rivett all spiffed up looks like. Belongs to one of my > best friends. He has to get the mop and bucket out every time I stop > over, due to the drool. > > Mark
I can't imagine a tool bit would ever chatter and shatter on that. You're right, he'd need to keep the mop and bucket rinsed out if I was around too. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> bug, n: A son of a glitch. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
