Building the Universal Pillar Tool??

[flatlineParticipant @flatline]

I have just acquired a Jacobs #01 chuck, capacity 0-1/4” – 0-6.6mm.

Reading Geo. H. Thomas book on the subject of building the UPT he recommended the smaller Jacobs #0 chuck (which seems difficult to acquire), suggesting that anything larger would probably be too large..

Is the slightly larger #01 indeed too large, or would it be a good ‘fit’ in the overall design of the UPT??

Many Thanks,

 

RD

[BazyleParticipant @bazyle]

A smaller chuck my be expected to hold a smaller drill more accurately. Some bozos seeing a 1/4 in chuck will assume they must use 1/4 in drills like, my particular peeve, the people who get a mini-lathe with a 4way toolpost that insist on using 20mm toolbits because they can squeeze them into said toolpost.

[flatlineParticipant @flatline]

Understood… My rationale was/is trying to stay true to the original design … I’m a bit of a purist sometimes.. When I found the Jacobs ‘1A’ (my mistake, I thought it was a ‘01’) I thought ‘ah-ha’.. 😎 But then discovered that it was larger than specified for the UPT…

I have seen Jacobs ‘0’ advertised, so may see if I can get one.

[Michael GilliganParticipant @michaelgilligan61133]

There is no doubt that the #0 is a delightful little thing:

MichaelG.

[DC31kParticipant @dc31k]

Arc do a very nice 4mm capacity chuk on a JT0.

https://www.arceurotrade.co.uk/Catalogue/Chucks/Drill-Chucks/Key-Type-Drill-Chucks

Difficult decision: some people have a notion that brand and country-of-origin matter; others opt for engineering performance and good value.

[DC31k]

On DC31k Said:

Arc do a very nice 4mm capacity chuk on a JT0.

https://www.arceurotrade.co.uk/Catalogue/Chucks/Drill-Chucks/Key-Type-Drill-Chucks

Difficult decision: some people have a notion that brand and country-of-origin matter; others opt for engineering performance and good value.

But its minimum size is 0.4mm whereas the Jacobs goes down to 0. Depends how small a drill bit you want to use in it. If you are not drilling carburettor jets or similar tiny sizes, the 0.4mm minimum would work.

[JasonBModerator @jasonb]

In practice it does go smaller, I think that is why ARC put the * next to the size. Also at those sizes a typical jobber HSS drill is so flexible you would be better off with PCB drills with their short business end and a decent dia shank to hold

Mine holding 0.3mm which is the smallest bit I have

[bernard towersParticipant @bernardtowers37738]

0 to 4 mm chuck is the one you want, the 1/4″ is huge in comparison and totally out of character on the UPT IMHO

[Roderick JenkinsParticipant @roderickjenkins93242]

When I made my UPT 30+ years ago I hesitated for a long time before spending £40 on the No.0 Jacobs chuck.  The big advantage was that the diameter is less than the 7/8″ OD of the drill spindle housing so the whole thing can be withdrawn from the arm.  I have just had a look at the small ARC chuck and this OD is less than 7/8″ so this would be my choice today.  A typical 1/4″ chuck is too big and looks clumsy in my view.

Rod

 

[bernard towersParticipant @bernardtowers37738]

Over the years I have had several different chucks on my UPT and have settled on a 0.2 to 4mm keyless from Rotagrip, the body is a bit larger than the previous chuck but the convenience out weighs that. The chucks that have seen service on my UPT are below and go from L to R Arc euro 0.3 to 4mm/ 0 to 5/32/ 1/64 to 1/4/ 0 to 5/16(for tapping)/0 to 1/8 keyless(too restrictive in capacity)/the current keyless/and lastly the tapping chuck made from drawings on Mikes Workshop site, fiddly but works well.

[Clive Brown 1Participant @clivebrown1]

When the Sensitive Drill design was published, the Jacobs 0 chuck was modestly priced. A while later the price leapt, this increase was ascribed by GHT to Jacobs stopping UK production of this particular size and sourcing only from America.

I have both an original, British, Jacobs and a more recent “Oriental” version off Ebay. Difficult to tell any real difference. The particular size certainly suits the UPT well.

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