Tapping Head ?

[Brian AbbottParticipant @brianabbott67793]

Evening all

Anyone have any information on this?

I know it’s some sort of tapping head but what’s missing ?, some sort of collets i guess..

 

[Dave HalfordParticipant @davehalford22513]

Should auto reverse when you let go of the knurled section and slip before the tap breaks. Hopefully there’s a collet still fitted.

I’ve found different tap makers use different tap shanks

[Clive FosterParticipant @clivefoster55965]

Looking at on-line pictures the “collets” look more like tap carriers than true “collapse to grip” collets.

I have a small clutchless tapping attachment of unknown breed that uses this system. The holders have a socket grub screw ti grip and drive the taps. Taps have to have a flat ground on them for the grab screw to grip. The square isn’t used. Drive is via a dog clutch arrangement with a spring pulling the head proper back to engage the clutch. Follow the self feed with the mill or drill quill, when you stop feeding the tap goes about 1/8″ deeper before teh dog clutch releases. Came run a box with some other stuff including some modified taps. Gets occasional use when what I have suits a job too small for my Pollard heads.

If you have nothing better the system could probably be used on that Tadco head. Several pictures show a lot of collets in the spacers provided in the box. Many more than collapse to grip collects would need over that range.

Clive

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