Re: [Emc-users] Lathe limit puzzle

[John Thornton]

Yep that is what I meant, multiple configs with soft limits for each 
change in limits.

On my plasma because of the size I have a "Rapid to Home" button that I 
press before powering off so I'm close to the home switches. Of course 
that won't prevent manual moving but would put you in a known place for 
start up.

JT


On 5/7/2016 1:32 PM, andy pugh wrote:
> On 7 May 2016 at 13:29, John Thornton  wrote:
>> You don't home away from the chuck?
> I rejected that idea on the previous lathe because of the tailstock.
> I hadn't considered it on this lathe but it might be the answer. I
> just have to remember to move the tailstock out of the way.
>> I'm guessing multiple configs is out of the question for some reason
>> like it's more fun to be inventive...
> Multiple configs doesn't really help, as I only have one sensor. I
> suppose i could consider taking the saddle apart again and installing
> more, but I would much rather not.
>
> Or were you meaning configs with different soft-limits and relying on
> them, with one general-purpose home sensor?
>


--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[andy pugh]

On 7 May 2016 at 22:10, John Alexander Stewart  wrote:
> Homing the lathe at headstock end seems like it would be courting disaster.

It probably depends on the lathe. It is safe with my Chinese lathe,
but looks like it isn't with the Holbrook.

Putting a useful limit in looks to be the hard part.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[John Alexander Stewart]

Andy;

I rejected that idea on the previous lathe because of the tailstock.
> I hadn't considered it on this lathe but it might be the answer. I
> just have to remember to move the tailstock out of the way.
>

I expect to put an estop switch on my tailstock, and home close to the
"tailstock end" of the lathe, for those times when the tailstock is locked
too close to the headstock. (better to estop on stupidity than destroy
something, or loose position, right??)


My Unimat CNC homes at the tailstock end, but no tailstock, but for my
larger lathe (whenever it comes up in the queue to finish...) it will have
the tailstock.

Homing the lathe at headstock end seems like it would be courting disaster.

John.
--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[andy pugh]

On 7 May 2016 at 13:29, John Thornton  wrote:
> You don't home away from the chuck?

I rejected that idea on the previous lathe because of the tailstock.
I hadn't considered it on this lathe but it might be the answer. I
just have to remember to move the tailstock out of the way.
>
> I'm guessing multiple configs is out of the question for some reason
> like it's more fun to be inventive...

Multiple configs doesn't really help, as I only have one sensor. I
suppose i could consider taking the saddle apart again and installing
more, but I would much rather not.

Or were you meaning configs with different soft-limits and relying on
them, with one general-purpose home sensor?

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[Bengt Sjölund]

http://93x57r.se/tecno-cnc/documents/CNC3000/Blomqvist-S%20CNC%20page4.pdf

This how it is done on my Lathe.

Fixed Limit at the far end from chuck, adjustable Home and movable Limit 
closest to chuck.
1 switch NC handles Limit and Home.

Bengt


Den 2016-05-07 kl. 18:43, skrev Dave Caroline:
> It mostly gets in the way so is usually off the bed.
>
> Dave
>
> --
> Find and fix application performance issues faster with Applications Manager
> Applications Manager provides deep performance insights into multiple tiers of
> your business applications. It resolves application problems quickly and
> reduces your MTTR. Get your free trial!
> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users


--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[Dave Caroline]

It mostly gets in the way so is usually off the bed.

Dave

--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[Gene Heskett]

On Saturday 07 May 2016 08:35:02 Dave Caroline wrote:

> The denford starturn has the switch on the saddle and a sliding member
> gripping the bed just visible under the chuck to the rear
> http://www.collection.archivist.info/archive/DJCPD/PD/2009/2009_09_10_
>Starturn_cnc_lathe/P1010045.JPG So you can put it where you need for a
> setup
>
> Dave Caroline

Thats rather a neat idea Dave. How subject to being mechanically fouled 
by swarf is that?

Thats why I "hid" my switch under the back flange of the top of the bed, 
and a rear carriage gib bolt head hits it, lots lower chance of its 
being fouled by swarf. In over a year, I don't recall that it has 
miss-homed that I am aware of...

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[Gene Heskett]

On Saturday 07 May 2016 08:18:48 Andy Pugh wrote:

> I am trying to figure out where to put the limit/home target on the Z
> axis of my lathe. The saddle can get all the way to the headstock if I
> am using the collet chuck, though it doesn't need to. If I put on a
> face-plate then the carriage will eventually hit that. The same is
> true for each of the chucks. In different places. I can't figure out a
> way to have useful soft _or_ hard limits, or a way to guarantee that
> the carriage is parked the right side of the home switch.
>
I have the same problem Andy, so the first thing I do is jog to the right 
an inch or so, before I hit the home all button. My toy used to have a 
backsplash, but it left to make room for the crossfeed motor on the 
rear.

I placed a $0.50 microswitch about an inch from the chuck so a cap screw 
holding the gib strip operates it.  It can't quite get past it with that 
5" chuck mounted, so the error I get isn't running the wrong direction, 
but "can't home when a shared switch is already closed"

> I do have an idea of a way to make the z-axis have absolute feedback.
> This is looking like a good plan for homing but doesn't really help
> with limits.

I set SW limits about a millimeter from running into the right Z screw 
bearing, and leave about 20mm more travel to the left from the home 
switch triggered point.  I can remove the QC tool holder, and with 
little concern over what might be mounted in the chuck, do a home-all.

X backs away, trips its switch about .1mm from the hard stop, and gets 
parked about 5mm in from there, so its well out of the way for z to head 
left at a good clip looking for its switch.

> I need an rfid tag in each chuck to change the soft limits on the fly,
> clearly.

Thats a neat idea, but how would that be carved up in the .hal file?  I 
wasn't aware that was even accessible to hal.  Not that I have anything 
in the way of chuck changing that could even be called slow change, it 
bolts on, and the nuts are very difficult to access when restarting the 
nuts onto the other chucks studs.  Major PIMA.  Dropped nuts of coarse 
are subject to Murphy's Law about where they wind up, always with the 
least accessible location imaginable as a target.  OTOH, that PIMA is a 
huge advantage in that I'll never have to worry about unscrewing the 
chuck while doing the reversals a rigid tap pecking routine can do. In 
my case, its broken/stripped drive parts as the treadmill motor has no 
problem putting out the power to do the damage. BTDT. Added a limit3 to 
the pid.s command path to gentle the reversals. Yet to be done is to do 
a couple air cuts and record the turn-around overshoot it will do at 
that rpm, and use that as the final stop point modifier so I can let the 
gcode do the calcs so that the final 2 or 3 pecks will hit the zero rpm 
point at exactly the desired depth. Something along the same line as 
the 'spring' cuts at the end of a g76. Fun and games for this summer if 
my back doesn't put me completely out of commission.  Old age is hell, 
put it off as long as you can...

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[Dave Caroline]

The denford starturn has the switch on the saddle and a sliding member
gripping the bed just visible under the chuck to the rear
http://www.collection.archivist.info/archive/DJCPD/PD/2009/2009_09_10_Starturn_cnc_lathe/P1010045.JPG
So you can put it where you need for a setup

Dave Caroline

--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Lathe limit puzzle

[John Thornton]

You don't home away from the chuck?

I'm guessing multiple configs is out of the question for some reason 
like it's more fun to be inventive...

JT


On 5/7/2016 7:18 AM, Andy Pugh wrote:
> I am trying to figure out where to put the limit/home target on the Z axis of 
> my lathe.
> The saddle can get all the way to the headstock if I am using the collet 
> chuck, though it doesn't need to.
> If I put on a face-plate then the carriage will eventually hit that. The same 
> is true for each of the chucks. In different places.
> I can't figure out a way to have useful soft _or_ hard limits, or a way to 
> guarantee that the carriage is parked the right side of the home switch.
>
> I do have an idea of a way to make the z-axis have absolute feedback. This is 
> looking like a good plan for homing but doesn't really help with limits.
>
> I need an rfid tag in each chuck to change the soft limits on the fly, 
> clearly.
> --
> Find and fix application performance issues faster with Applications Manager
> Applications Manager provides deep performance insights into multiple tiers of
> your business applications. It resolves application problems quickly and
> reduces your MTTR. Get your free trial!
> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users


--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

[Emc-users] Lathe limit puzzle

[Andy Pugh]

I am trying to figure out where to put the limit/home target on the Z axis of 
my lathe. 
The saddle can get all the way to the headstock if I am using the collet chuck, 
though it doesn't need to. 
If I put on a face-plate then the carriage will eventually hit that. The same 
is true for each of the chucks. In different places. 
I can't figure out a way to have useful soft _or_ hard limits, or a way to 
guarantee that the carriage is parked the right side of the home switch. 

I do have an idea of a way to make the z-axis have absolute feedback. This is 
looking like a good plan for homing but doesn't really help with limits. 

I need an rfid tag in each chuck to change the soft limits on the fly, clearly. 
--
Find and fix application performance issues faster with Applications Manager
Applications Manager provides deep performance insights into multiple tiers of
your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users