How about a cheap solid state sensor that detects orientation or just any
movement? Store it business end up and when flipped upright it turns on fully.
Put it back in its storage rack and in a couple of minutes it shuts down. Give
it a large coin cell and it can run for years. The latest RadBeacon Locator
Tents (as seen at McDonalds) are juiced up for up to five years. When they
started them in 2016 the company sold them based on an annual replacement
program.
Dunno what their current specifications are except they have BlueTooth. One
version circa 2018 had a 32-bit ARM Cortex M4F processor at 64 MHz with 512 KB
flash and 64 KB SRAM. Some extreme computing power just to broadcast its
location, in a restaurant where all the tables are line of sight from the
counter (in most locations).
On Monday, August 31, 2020, 11:06:46 PM MDT, John Dammeyer
<[email protected]> wrote:
> -----Original Message-----
> From: N [mailto:[email protected]]
> Sent: August-31-20 9:21 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Tool presetter
>
> > I have one of these.
> > Fowler 54-575-600 Electronic Edge Finder with Cylindrical Tip, 0.200"
> > Stylus, 1/2" Shank
> >
> > I use it with the Shumatech DRO to find edges or the center of something
> >round. The DRO-350 has a feature for that. Eventually
> I'll wire up a cable that can be sensed by LinuxCNC to detect the edge
> automatically.
>
> Was also thinking about a cable, however need to connect it each time
> otherwise tool changer will slowly turn it into a twisted cable.
> Expect they are more or less equally good as 3D taster but much cheaper.
>
Nicklas
You make a good point. It should be possible to make some sort of holder which
fits around a TT mill holder shank. The holder could have a small Blue Tooth
Low Power module that signals contact.
The issue might be response time. Or noise that delays the contact signal long
enough to break the probe.
All that is required then is a battery and we really don't want it powered all
the time. So that's another issue that needs to be addressed. Since the TT
holders are pressed against the spindle for repeatability some sort of switch
in the holder could also turn it on.
For other types of holders that use the draw bar to pull in the holder, the
center pull tab could potentially be the connection that closes the circuit.
John Dammeyer
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