Re: [Emc-users] Lathe saddle protection

I have a Denford Orac with a switch on the saddle and an adjustable stop that clamps on the bed. I also use another machine that has a fixed switch on the headstock and is an adjustable rod on the saddle to set the trip point. These has saved the machines from damage a couple of times and I

Re: [Emc-users] Lathe saddle protection

On Friday 20 November 2015 06:29:18 Les Newell wrote: > I have a Denford Orac with a switch on the saddle and an adjustable > stop that clamps on the bed. I also use another machine that has a > fixed switch on the headstock and is an adjustable rod on the saddle > to set the trip point. These

Re: [Emc-users] Lathe saddle protection

On 20 November 2015 at 12:58, Les Newell wrote: > A mechanical switch is probably best in this application. Swarf is > unlikely to provide the solid push needed to operate a switch The danger there seems to be that the chuck jaws might simply shorten the plunger by a

Re: [Emc-users] Lathe saddle protection

On Friday 20 November 2015 06:00:00 andy pugh wrote: > Has anyone ever tried embedding proximity sensors in their lathe > saddle to protect against chuck-strikes or backing up against the > tailstock? > > If so, any "lessons learned" about where to put the sensors? Chuck strikes would seem to be

Re: [Emc-users] Lathe saddle protection

I have the mechanical version on one of the lathes too, it is job specific I dont see how a proximity switch could know all possible errors of eg hitting jaws, chuck body or work or even the headstock. The little denford cnc lathe has the electrical stop movable on the bed. Dave

[Emc-users] Lathe saddle protection

Has anyone ever tried embedding proximity sensors in their lathe saddle to protect against chuck-strikes or backing up against the tailstock? If so, any "lessons learned" about where to put the sensors? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto

Re: [Emc-users] Lathe saddle protection

On 20 November 2015 at 11:13, John Thornton wrote: > My Samson lathe has an adjustable kick out for the saddle feed. I can > move it along the Z axis to where I need the feed to kick out. It is > under the saddle, I don't have a photo of it atm. You could do the same > with a

Re: [Emc-users] Lathe saddle protection

On 20 November 2015 at 11:50, Gene Heskett wrote: > Chuck strikes would seem to be so "tool mounted" a variable as to be > unsolvable. I don't see why. The same area of the saddle is likely to be at risk of hitting the chuck jaws in must setups. I am not trying to protect

Re: [Emc-users] Lathe saddle protection

On 20/11/15 12:30, andy pugh wrote: > One concern with any such idea would be that swarf might trip the > sensor. Some super-clever frequency analysis might be needed (3x or 4x > spindle speed) to tell the difference. A mechanical switch is probably best in this application. Swarf is unlikely

Re: [Emc-users] Lathe saddle protection

On Friday 20 November 2015 07:58:20 Les Newell wrote: > On 20/11/15 12:30, andy pugh wrote: > > One concern with any such idea would be that swarf might trip the > > sensor. Some super-clever frequency analysis might be needed (3x or > > 4x spindle speed) to tell the difference. > > A mechanical

Re: [Emc-users] Lathe saddle protection

On 20 November 2015 at 15:30, Gene Heskett wrote: > I have probably worn off an eighth of an > inch off the nose of the compound feed since it usually hangs out in > front of the saddle. Just one of the reasons I have considered removing > it and replacing it with a block of

Re: [Emc-users] Lathe saddle protection

On Friday 20 November 2015 07:30:49 andy pugh wrote: > On 20 November 2015 at 11:50, Gene Heskett wrote: > > Chuck strikes would seem to be so "tool mounted" a variable as to be > > unsolvable. > > I don't see why. The same area of the saddle is likely to be at risk > of

Re: [Emc-users] Lathe saddle protection

> I wonder how a hall effect might work, to sense the chucks jaws going > by when it gets too close? I think I'd boost the length of its output > pulse with a one shot to make sure its triggering wasn't missed though > when the servo thread is the only one, no base thread to read it every >

Re: [Emc-users] Lathe saddle protection

Just thinking out loud here. I have seen table saws that have emergency stop systems that use capacitance (I believe) to sense when something (a finger) touches the blade. The touch sensor trips a brake that stops the blade virtually instantly. I was thinking something similar could be used

Re: [Emc-users] Lathe saddle protection

On Friday 20 November 2015 13:10:05 Les Newell wrote: > > I wonder how a hall effect might work, to sense the chucks jaws > > going by when it gets too close? I think I'd boost the length of its > > output pulse with a one shot to make sure its triggering wasn't > > missed though when the servo

Re: [Emc-users] Lathe saddle protection

On Friday 20 November 2015 10:47:15 andy pugh wrote: > On 20 November 2015 at 15:30, Gene Heskett wrote: > > I have probably worn off an eighth of an > > inch off the nose of the compound feed since it usually hangs out in > > front of the saddle. Just one of the reasons I

Re: [Emc-users] Lathe saddle protection

Do what the big companies do. Make up a big sign or list of things you need to do and put it over your lathe.. You need to get tougher on yourself! ;-) Actually a procedural checklist might make sense. Dave On 11/20/2015 1:48 PM, andy pugh wrote: > On 20 November 2015 at 18:10, Les Newell