On 2/22/2016 9:15 AM, andy pugh wrote:
> On 17 February 2016 at 17:14, Dave Cole wrote:
>> Prox switches are just the opposite. Most are even waterproof.
>> Prox switches are becoming very cheap. Someplace is trying to sell me
>> some for about $10 each with a cable.
>> I've used Prox switches
On 17 February 2016 at 17:14, Dave Cole wrote:
> Prox switches are just the opposite. Most are even waterproof.
> Prox switches are becoming very cheap. Someplace is trying to sell me
> some for about $10 each with a cable.
> I've used Prox switches on very expensive machines for homing and li
I understand your situation.
In light of what you said you might want to go with Prox switches and
forget about mechanical microswitches.
My reason is this: Small cheap mechanical microswitches are very easy
to break and hard to mount, protect and adjust.
Prox switches are just the opposite. M
on.ch...@gmail.com]
> > Sent: February-16-16 6:34 PM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Micro-switch repeatability
> >
> >
> > Look at how inkjet printers work. They need to trip a home switch so
> that
> > each line of
On 02/17/2016 04:28 PM, Dave Cole wrote:
> The other approach to take is to forget about home switches and do a
> touch off on the work or the stops by using a probe.
Yes, you are right. That would be a good solution.
I may just want to clarify... The whole discussion is not about the
correct or
The other approach to take is to forget about home switches and do a
touch off on the work or the stops by using a probe.
Mount the probe in in the spindle and touch off on the stops or the
workpiece to obtain a zero position.
There are some relatively inexpensive probes for sale.
Most homing sys
On 02/17/2016 04:28 AM, Gregg Eshelman wrote:
>> I'm now considering to take an old CD player and move the
>> laser-assembly onto several micro-switches at different speeds. The
>> laser-assembly is sub-micrometer accurate (CD track-separation runs at
>> 1.5...1.6 um) and generally uses a simple st
On 2/16/2016 9:40 PM, John Dammeyer wrote:
> I believe they only use the home switch to figure out where the end of the
> printer is. Once established for page of printing it's not used to
> reference until perhaps the next page and probably not even then. From then
> on the positioning is based
to
do a slow homing operation on every line.
John Dammeyer
> -Original Message-
> From: Chris Albertson [mailto:albertson.ch...@gmail.com]
> Sent: February-16-16 6:34 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Micro-switch repeatability
>
On 2/16/2016 6:47 AM, Bertho Stultiens wrote:
> The micro-switches look like they can manage at almost no cost. But then
> my curiosity got in my way on how far you actually can go with the
> cheapo method. I'm now considering to take an old CD player and move the
> laser-assembly onto several mic
Look at how inkjet printers work. They need to trip a home switch so that
each line of sprayed ink lines on to better then 1/1000th of an inch. They
use a low cost optical device. There is a slot cut in a plastic block.
One one side is a LED on the other a light detector. The look at each
other
agreed
a near home switch
and
a home switch
fanuc called the near hone a 'decel switch'
tomp
On 02/16/2016 10:42 PM, Kurt M. Sanger wrote:
> When we were building high resolution printers we would use an optical
> switch looking at a rotary flag in series with a linear switch to define
> home. W
On 02/16/2016 06:46 AM, Bertho Stultiens wrote:
> The only alternative is to use a level-based micro-switch. That,
> however, will probably make it less accurate. Especially when you move
> over it side-ways. The angle of attack is too small with respect to
> the travel distance.
I use roller
When we were building high resolution printers we would use an optical
switch looking at a rotary flag in series with a linear switch to define
home. We repeated well within ten thousandths of an inch.
Kurt Sanger
--
S
On 02/16/2016 03:15 PM, TJoseph Powderly wrote:
>> I heard rumors here a while ago about micro meter accuracy switch
>> but I guess it might be a little bit expensive.
> my-com switches, 1um guaranteed. every good german wedm uses them
> and high end japanese
> my-com
> yes expensive paeng maak!
my-com switches, 1um guaranteed. every good german wedm uses them
and high end japanese
my-com
yes expensive paeng maak! but damn accurate
tomp
On 02/16/2016 02:53 PM, Nicklas Karlsson wrote:
> I heard rumors here a while ago about micro meter accuracy switch but I guess
> it might be a littl
On 02/16/2016 02:01 PM, Lester Caine wrote:
>> Indeed, unless you can crush them. There must be a run-into-the-wall
>> protection, as mentioned earlier, to prevent killing your switch.
>
> The problem on the Taig is while one hits the end stop one end, you come
> out of the nut the other ;) But wh
On 16/02/16 12:26, Bertho Stultiens wrote:
>> The alternatives seem to have the same problems of repeatability. Using
>> > a hall sensor or optical one will give the same problems. Micro-switches
>> > are at least inherently mechanically constrained.
> Indeed, unless you can crush them. There must
On 02/16/2016 01:38 PM, Nicklas Karlsson wrote:
It seems that the micro-switches are well suited for the purpose, but I
guess some hard (unbiased) data has yet to be gathered (outside of a mill).
>>> The alternatives seem to have the same problems of repeatability. Using
>>> a hall sensor
> On 02/16/2016 12:42 PM, Lester Caine wrote:
> > On 16/02/16 10:21, Bertho Stultiens wrote:
> >> It seems that the micro-switches are well suited for the purpose, but I
> >> guess some hard (unbiased) data has yet to be gathered (outside of a mill).
> >
> > The alternatives seem to have the same
On 02/16/2016 12:42 PM, Lester Caine wrote:
> On 16/02/16 10:21, Bertho Stultiens wrote:
>> It seems that the micro-switches are well suited for the purpose, but I
>> guess some hard (unbiased) data has yet to be gathered (outside of a mill).
>
> The alternatives seem to have the same problems of
On 02/16/2016 12:39 PM, Dave Caroline wrote:
> I originally searched for a switch with data and a local distributor
> had some movement specs of the plunger, I got some but unfortunately
> that distributor no longer lists the item. but it is a Patterson V4
> type microswitch, the .tw website of the
On 16/02/16 10:21, Bertho Stultiens wrote:
> It seems that the micro-switches are well suited for the purpose, but I
> guess some hard (unbiased) data has yet to be gathered (outside of a mill).
The alternatives seem to have the same problems of repeatability. Using
a hall sensor or optical one wi
I originally searched for a switch with data and a local distributor
had some movement specs of the plunger, I got some but unfortunately
that distributor no longer lists the item. but it is a Patterson V4
type microswitch, the .tw website of theirs is not easy to read
though. One day I might fit t
On 02/16/2016 07:53 AM, Nicklas Karlsson wrote:
> I heard rumors here a while ago about micro meter accuracy switch but
> I guess it might be a little bit expensive.
Well, yes. The "real" switches which are /specified/ with repeatability
values of about 0.005mm are in the order of $200...$300 per
On 2/15/2016 11:53 PM, Nicklas Karlsson wrote:
> I heard rumors here a while ago about micro meter accuracy switch but I guess
> it might be a little bit expensive.
What about the Hall effect or optical sensors that are options with
generic electronics parts kits for 3D printers?
BTW, Mattel is
I heard rumors here a while ago about micro meter accuracy switch but I guess
it might be a little bit expensive.
On Tue, 16 Feb 2016 07:41:41 +0200
Roland Jollivet wrote:
> As others will advise, a slotted disc directly on the stepper is your best
> option. It's the finest resolution you'll ac
On Monday 15 February 2016 21:35:29 TJoseph Powderly wrote:
> Gene
> an improved home routine would add a solenoid and piping to clean the
> switches
Ohmygawd. ROTFL. TomP, you kill me with your logic. Of course that would
work, but this toy lathe, no matter how much lipstick you put on it, is
most commercial cncs have encoder home morks ( Z phase)
and they have what users often miss-call a 'home' switch
its really a 'close to home, slow down you fool' switch
so the velocities during the home 'stretch' ( between 'nearhome' and home)
are always controlled
the distance between those sh
Gene
an improved home routine would add a solenoid and piping to clean the
switches
no more "wheres the dang non-osha gun gone today?"
tomp
On 02/16/2016 10:11 AM, Gene Heskett wrote:
I paint brush or air hose the swarf from in front of it before I
command a home,
---
On Monday 15 February 2016 19:37:43 Bertho Stultiens wrote:
> On 02/16/2016 01:16 AM, Len Shelton wrote:
> > We in fact see about 2-3 tenths of a thou repeatibility with a slow
> > approach on cheap chinese snap switches.
>
> Just like what others seem to report.
>
> Is that on direct activation o
On Monday 15 February 2016 19:11:10 Jack Coats wrote:
> I saw some prox sensors ebay (china trash) that folks on 3D printers
> are using for automatic bed leveling compensation. They are about
> $2.50/ea delivered, others are $10 if you want a better quality.
>
> Their repeatability is good,
But
On Monday 15 February 2016 19:08:34 Bertho Stultiens wrote:
> On 02/16/2016 12:57 AM, Gene Heskett wrote:
> > I am using some micro-mini roller lever junk I got for 6 bucks a bag
> > of 10 from ebay. Repeatability according to my dials is well within
> > .001" even with crap switches. Its a "dry
Bertho;
I did some tests, plotted the results, etc, at:
http://cnc-for-model-engineers.blogspot.ca/2015/06/home-switch-repeatability.html
I think my major issue was the mounting for my dial indicator, and if you
do read the article, I did some tests with my new mill, and results are the
same or
I saw some prox sensors ebay (china trash) that folks on 3D printers are
using for automatic bed leveling compensation. They are about $2.50/ea
delivered, others are $10 if you want a better quality.
Their repeatability is good,
If using switches, please check the brand. Microswitch and possibl
I also remember someone, could have been at reprap.org or cncrouterparts.com,
doing repeatability tests, and getting similar surprisingly consistent
results with cheap switches.
On Mon, Feb 15, 2016 at 5:04 PM, Len Shelton wrote:
> We don't use levers, we activate the plungers directly. The key
We don't use levers, we activate the plungers directly. The key is to
design the switch mount such that a physical stop would prevent wrecking
the plastic switch on a rapid jogs ooops.
>Len
On 2/15/2016 6:37 PM, Bertho Stultiens wrote:
> On 02/16/2016 01:16 AM, Len Shelton wrote:
>> We in fa
On 02/16/2016 01:16 AM, Len Shelton wrote:
> We in fact see about 2-3 tenths of a thou repeatibility with a slow
> approach on cheap chinese snap switches.
Just like what others seem to report.
Is that on direct activation or using an positional offset on a lever?
Using a lever seems like intro
We in fact see about 2-3 tenths of a thou repeatibility with a slow
approach on cheap chinese snap switches.
>Len
On 2/15/2016 6:08 PM, Bertho Stultiens wrote:
> On 02/16/2016 12:57 AM, Gene Heskett wrote:
>> I am using some micro-mini roller lever junk I got for 6 bucks a bag of
>> 10 from e
On 02/16/2016 12:57 AM, Gene Heskett wrote:
> I am using some micro-mini roller lever junk I got for 6 bucks a bag of
> 10 from ebay. Repeatability according to my dials is well within .001"
> even with crap switches. Its a "dry' circuit, so as long as the
> contacts are clean, there's very li
On 02/16/2016 12:53 AM, Dave Cole wrote:
>> Has anyone numbers on the repeatability of "normal"
>> micro-switches?
>>
>> Micro-switches are (relatively) cheap and mostly not too shabby,
>> but I have a not seen any hard data on repeatability (other than
>> datasheets saying that they are made for
On Monday 15 February 2016 18:44:00 Bertho Stultiens wrote:
> Hi,
>
> I'm looking for an on-the-cheap way to do reasonable homing. Usual
> switches for the purpose cost a lot. The machine only has a
> repeatability of 0.02mm, so it may just be a waste to use too accurate
> (expensive) switches.
>
If you have a marker pulse on an encoder you can use a cheap home switch
and back off to the marker pulse.
Dave
On 2/15/2016 6:44 PM, Bertho Stultiens wrote:
> Hi,
>
> I'm looking for an on-the-cheap way to do reasonable homing. Usual
> switches for the purpose cost a lot. The machine only has a
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