Universal Pillar Tool – Pad Bolt

[File HandleParticipant @filehandle]

Read the recent article in MEW on the UPT. Had not come accros the term “pad bolt” before – or it had faded from my memory. A google search was initially of little help as it was trying to sell me door bolts. Also never heard the expression used for a door bolt, padlock yes, perhaps they are related. However, refining the search I did find an image, so this coupled with how it is used I hope gave me an understanding.
A couple of short, very thick wall tubes pulled together with a bolt. The joint of the tubes being machined to to give a concave recess that matches the profile of the circular pillar. Thus when the pad bolt in in the arm, and the bolt tightened, the arm is locked in place. Seems a lot neater than slit and nip, but I guess harder to make. Hopefully I have this right.

On the web I have seen variations of UPTs made by machining from solid or even using pipe connecting Tees. Mainly because not being in the UK, postage costs make castings very expensive.
Although a very clever yet simple idea, I guess the UPT owes its origins to some of the “helping hands” used by blacksmiths.
I look forward to the rest of the series, which I guess will answer my query about the pad bolts.

[Michael GilliganParticipant @michaelgilligan61133]

Described in predictably ample detail in GHT’s book:

“Building the Universal Pillar Tool”

MichaelG.

[File HandleParticipant @filehandle]

Thanks, but I was already aware of that. The pdf I downloaded which describes the use of water Tees. In it cotters are described, which have the same function, but only one appears to make contact with the pillar, so maybe not exactly the same, or perhaps a different name for the same thing.
I was more commenting that google wasn’t very helpful with the term pad bolt.

[Michael GilliganParticipant @michaelgilligan61133]

In my experience, Google is often not very helpful

MichaelG.

.

Edit: __ these are a little unsophisticated, but they are known to Google

https://www.kipp.se/xs_db/DOKUMENT_DB/www/KIPP_DE_CH_PL/BEDIENTEILE/DataSheet/en/K03/K0375_Datasheet_1547_Shaft_clamping_units–en.pdf

Trouble is, it needs human [or perhaps human-esque] intelligence to recognise that a particular picture sort-of matches what one is searching-for, amongst all the dross.

Hint: my search term was shaft clamping mechanism

predictably, Google found  many images … from which I selected that one.

How one would refine the search term, so as to narrow the results, is beyond me.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi File Handle, Similar to the one that MichaelG has shown, here’s one that belongs to an old drill-head that has a three inch solid shaft, and the one in the drill table is much the same, and both parts grip the shaft.

Regards Nick.

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