Electronics > Metrology

LowThermal Binding Post CAD

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LowThermal 2758 binding posts http://www.lowthermal.com/cables-and-connectors.php are fairly common in metrology because they use tellurium-copper for its combined low thermal electromagnetic electromotive field electromotive force (EMF, https://download.tek.com/document/LV_LR_e-hnbook_91113.pdf) effects and machinability. These posts have decent insulative properties, are multi-functional, and are aesthetically pleasing. Other features are detailed in the datasheet http://www.lowthermal.com/pdf/2758-series-data.pdf. Varients of LowThermal posts can be found in commercially available designs (i.e. Agilent, Fluke, Guidelines, etc.) and can be directly purchased in small quantities for a moderate price (~ 30 USD/unit).

Some hobbyists may be satisfied with the dimensions specified in the datasheet. For my personal designs, I would like to have a CAD assembly available. I decided to address this obstacle so that others may also benefit from my effort.

A few months ago, I purchased posts for a design I am working on. TiN was very helpful when I reached out to him in that he provided a collection of damaged posts for reference so that no one needed to sacrifice a brand new post for the cause.  :-+

Attached is the reverse-engineered CAD assembly. Use 7-Zip https://www.7-zip.org/ to extract the STP file.

Please note that there are likely some differences in the dimensions. For example, I am uncertain what the interface between the plastic mould and the metal barrel looks like for the front chassis flange, even though it has no impact on the effective use of the assembly. I also did not count the knurls for the plastic end cap or the metal components. These are guestimations until accurate information comes along. If anyone does encounter significant discrepancies, please let me know so that a revision can be made. I will not take any responsibility for the CAD. Use at your own risk.



REV5: The through-hole wire connection termination is now correctly aligned with the D-hole conduit. Refer to the picture where changes have been outlined in blue.

Thanks for doing that  - it is useful for many things.

I don't think that Fluke uses the Low Thermal posts. I picked up some Fluke parts for an 8508A DMM project, and they are slightly different.

That said, the major parts are interchangeable between Fluke and Low Thermal.

Also, Fluke parts are unplated copper, LT are gold plated.

I don't understand why the Fluke posts do not corrode - they seem to stay bright. 

And while we are here - anybody got a good source for #8 copper or gold plated copper nuts? I have managed to either source or have made the copper washers, but no luck with nuts.

(BTW, Fluke posts alone - the copper shaft with the captive terminal nut assembly - is a deal at about $8 each, and will replace the ones I busted in my Low Thermal parts. Don't overtighten).


--- Quote from: leighcorrigall on October 11, 2021, 02:25:24 am ---low thermal electromagnetic field (EMF)

--- End quote ---

Just a random correction I need to make.  EMF in this case is the electromotive force, not the electromagnetic field.


--- Quote from: CalMachine on October 11, 2021, 12:24:53 pm ---EMF in this case is the electromotive force, not the electromagnetic field.

--- End quote ---

Thanks. I was not thinking when I wrote that.

is also selling LowThermal parts


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