Iron tip trouble

On Thursday, August 1, 2019 at 7:19:52 PM UTC-7, pcdh...@gmail.com wrote:

> Anybody got a good set of non-magnetic hot tweezers?

Even cold tweezers have a magnetization problem. I've found a desktop
degaussing coil to be essential for fine-parts work.

If you want something that doesn't magnetize and doesn't stick to solder,
titanium would be ideal. I wonder how hard it would be to fit Ti tips to
a Pace tweezer?
 
On 8/2/19 3:04 PM, whit3rd wrote:
On Thursday, August 1, 2019 at 7:19:52 PM UTC-7, pcdh...@gmail.com wrote:

Anybody got a good set of non-magnetic hot tweezers?

Even cold tweezers have a magnetization problem. I've found a desktop
degaussing coil to be essential for fine-parts work.

If you want something that doesn't magnetize and doesn't stick to solder,
titanium would be ideal. I wonder how hard it would be to fit Ti tips to
a Pace tweezer?

Titanium won't take solder.

The Metcals use Curie effect for temperature regulation, so they're
magnetic. For some reason the tweezers are much worse than the irons.

I like to use the tweezers to place parts--it's very fast when it works,
but that's basically only 0805s and up. Otherwise I have to get some
other tool in to hold the part down when I remove the tweezers.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On 8/2/2019 4:17 PM, Robert Baer wrote:
> Multicore Savbit

Interesting - it has copper in it, so that the copper of the iron is not
attacked:
www.farnell.com/datasheets/315929.pdf
 
On 03/08/2019 05:59, Phil Hobbs wrote:
On 8/2/19 3:04 PM, whit3rd wrote:
On Thursday, August 1, 2019 at 7:19:52 PM UTC-7, pcdh...@gmail.com wrote:

Anybody got a good set of non-magnetic hot tweezers?

Even cold tweezers have a magnetization problem.   I've found a desktop
degaussing coil to be essential for fine-parts work.

If you want something that doesn't magnetize and doesn't stick to solder,
titanium would be ideal.   I wonder how hard it would be to fit Ti
tips to
a Pace tweezer?


Titanium won't take solder.

The Metcals use Curie effect for temperature regulation, so they're
magnetic.  For some reason the tweezers are much worse than the irons.

Is the RF magnetic field (13.56MHz I think) really strong enough to pick
things up? I have two MX500 and don't recall having this problem.

Perhaps I am not seeing this problem because I did remove the big NdFeB
magnets from the stand that came with the newer MX500, because I don't
like the iron being made to cool down when I put it away. I prefer to
turn off the power when I want it cold, and otherwise I want it hot
right away. The stand that came with the older MX500 never had the NdFeB
magnets in the first place. I guess that they added the magnets to
reduce the warranty costs due to the insulation of the coils in the tips
failing - at my previous workplace we used to send off batches of failed
tips for free replacements.
 
On Sunday, August 4, 2019 at 9:39:37 AM UTC-4, Chris Jones wrote:
On 03/08/2019 05:59, Phil Hobbs wrote:
On 8/2/19 3:04 PM, whit3rd wrote:
On Thursday, August 1, 2019 at 7:19:52 PM UTC-7, pcdh...@gmail.com wrote:

Anybody got a good set of non-magnetic hot tweezers?

Even cold tweezers have a magnetization problem.   I've found a desktop
degaussing coil to be essential for fine-parts work.

If you want something that doesn't magnetize and doesn't stick to solder,
titanium would be ideal.   I wonder how hard it would be to fit Ti
tips to
a Pace tweezer?


Titanium won't take solder.

The Metcals use Curie effect for temperature regulation, so they're
magnetic.  For some reason the tweezers are much worse than the irons.

Is the RF magnetic field (13.56MHz I think) really strong enough to pick
things up? I have two MX500 and don't recall having this problem.

Perhaps I am not seeing this problem because I did remove the big NdFeB
magnets from the stand that came with the newer MX500, because I don't
like the iron being made to cool down when I put it away. I prefer to
turn off the power when I want it cold, and otherwise I want it hot
right away. The stand that came with the older MX500 never had the NdFeB
magnets in the first place. I guess that they added the magnets to
reduce the warranty costs due to the insulation of the coils in the tips
failing - at my previous workplace we used to send off batches of failed
tips for free replacements.

It's not the energizing current. It's the magnets in the tip that constitute the thermostat.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209
 
On 8/4/19 9:39 AM, Chris Jones wrote:
On 03/08/2019 05:59, Phil Hobbs wrote:
On 8/2/19 3:04 PM, whit3rd wrote:
On Thursday, August 1, 2019 at 7:19:52 PM UTC-7, pcdh...@gmail.com
wrote:

Anybody got a good set of non-magnetic hot tweezers?

Even cold tweezers have a magnetization problem.   I've found a desktop
degaussing coil to be essential for fine-parts work.

If you want something that doesn't magnetize and doesn't stick to
solder,
titanium would be ideal.   I wonder how hard it would be to fit Ti
tips to
a Pace tweezer?


Titanium won't take solder.

The Metcals use Curie effect for temperature regulation, so they're
magnetic.  For some reason the tweezers are much worse than the irons.

Is the RF magnetic field (13.56MHz I think) really strong enough to pick
things up? I have two MX500 and don't recall having this problem.

It's the DC field of the MX5 Talon tips. I'll try degaussing them and
see if that helps.


Cheers

Phil Hobbs



--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On 05/08/2019 00:19, Rick C wrote:
On Sunday, August 4, 2019 at 9:39:37 AM UTC-4, Chris Jones wrote:
On 03/08/2019 05:59, Phil Hobbs wrote:
On 8/2/19 3:04 PM, whit3rd wrote:
On Thursday, August 1, 2019 at 7:19:52 PM UTC-7, pcdh...@gmail.com wrote:

Anybody got a good set of non-magnetic hot tweezers?

Even cold tweezers have a magnetization problem.   I've found a desktop
degaussing coil to be essential for fine-parts work.

If you want something that doesn't magnetize and doesn't stick to solder,
titanium would be ideal.   I wonder how hard it would be to fit Ti
tips to
a Pace tweezer?


Titanium won't take solder.

The Metcals use Curie effect for temperature regulation, so they're
magnetic.  For some reason the tweezers are much worse than the irons.

Is the RF magnetic field (13.56MHz I think) really strong enough to pick
things up? I have two MX500 and don't recall having this problem.

Perhaps I am not seeing this problem because I did remove the big NdFeB
magnets from the stand that came with the newer MX500, because I don't
like the iron being made to cool down when I put it away. I prefer to
turn off the power when I want it cold, and otherwise I want it hot
right away. The stand that came with the older MX500 never had the NdFeB
magnets in the first place. I guess that they added the magnets to
reduce the warranty costs due to the insulation of the coils in the tips
failing - at my previous workplace we used to send off batches of failed
tips for free replacements.

It's not the energizing current. It's the magnets in the tip that constitute the thermostat.

My Weller has a magnet in the switch assembly, but I have disassembled a
dead Metcal tip, and read their patents (US4745264, US4839501), and it
doesn't rely on a permanent magnet in the tip. I believe that there is a
copper slug with some sort of resistive plating on it that has the right
Curie temperature, all inside a little coil. I believe that the way it
works is that there is a very strong skin effect in the plating below
its Curie point, so that the current flows in the highly-resistive
plating. Above the Curie point, most of the current flows in the copper,
so the heating is greatly reduced.

I suspect that the big NdFeB magnets in the newer stands are intended to
saturate the plating inside the tip, leading to less skin effect, and
less heating.
 

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