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Most quality drill presses , table saws & even some bench grinders have those built into the motors . Look for the little red button .? Their real handy units to have a couple laying around . The pellet stove in my other shop has 3 inside . Having no manual it took me a while to find all of them . I like the idea of one on the printer bed . Been thinking about something like this , last week the thermocouple on my print head came out of its place on the print head I knew something was up I could smell it & hit the emergency shutoff & after some diggin I found it's little head out in open air instead of its hole it lives in .

thanks

animal

On 4/8/24 9:04 AM, Chris Albertson wrote:

These things are a thermal switch.? They open an electrical circuit if the temperature is above their set point.? So you would bolt them firmly to any object that you do nopt want to be very hot. ? That might be the motor

But our mini-lathes are usually hand operated so the operator would be close by and if the spindle jammed, he’d see it and shut off ther power manually.

There switches are mostly used on automated equipment where the operator is not present.? It might be good to have one on a CNC lathe or mill because you might not be nearby while it is running. ? I have one on the heated baed of a 3D printer as a backup shutdown in case the primary controller fails to detect an accidental overheating. ? ?THese are almost always used as a backup system to a primary controller.

You see them mounted inside domestic water heaters too, If the heat ever gets to 125C, there is obviously something wrong (water can’t be heated over 100C) and the system needs to shutdown.? Same with cloths driers, they use these thermal switches to shutdown power if the unit gets too hot, which would only happen if the primary controller failed.

Modern equipment of all kinds is usually designed so that it remains safe even after a major failure happens, ?So they use these on anything that can overheat and catch fire. ? But again, do you need one on a manually operated lathe?? If so then why not on a drill press, table saw or bench grinder?

On Apr 8, 2024, at 12:25?AM, DAVID WILLIAMS via <d.i.williams@...> wrote:

Dear All,

First, thank you for the information.

Sorry for my ignorance, but where exactly do you fit these resettable thermal fuses on the lathe. Anywhere on the live power line input?? As they are resettable, then presumably they must be relatively easily accessible.?

Thanks in anticipation.

David (UK)

On 8 Apr 2024, at 06:54, Tony Smith <ajsmith1968@...> wrote:

?

Those are “last resort” fuses, you really want a resettable one like these:?, or these:?

?

Replacing those fuses is a PITA, especially since they need to be crimped, not soldered.? (Everyone makes that mistake at least once.)

?

No harm having both, just make sure the resettable one is a lower temperature.

?

Tony

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?

From:?[email protected] <[email protected]>?On Behalf Of?davesmith1800
Sent:?Monday, 8 April 2024 3:24 PM
To:?[email protected]
Subject:?[7x12MiniLathe] Motor protection

?

Using time delay and thermal overload?
Will save a motor?

This is a thermal over load set at 200°F or 93°C.?


Time delay gives a over load for starting to 10 time rate ampage for very short time.

Dave??