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Short QC Biltz type tapping chuck

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PekkaNF:
I have some 19 mm arbor size tapping adapters and chuck. The chuck has some spring load float out. Problem is that the tap hangs out pretty far.



The quick connect does not appear too complicated. I disassembled MT2 (in picture) chuck and the quick connect coupling looks pretty simple to make.

I checked ebay...looks like Britons have it pretty easy, but many shops have jacked up P&P to Finland to over 30€.

1: Any good DIY pointers? I'm thinking a simple standard ball coupling - linear or twist lock.

2: Maybe I have missed a proper search word for chuck only...I find only very expensive ones.

Pekka

awemawson:
Pekka,

I have only ever bought them second hand on eBay where often sellers hope for a fortune but bargains CAN be had. New ones demand a Kings ransom !

There are two styles (straight and torque limiting) the later being adjustable with a pin spanner. and come in a range of sizes besides your 19 mm from very small  to quite large, and of course each range comes in a variety of tap shank and square sizes.

I see no reason why a spring loaded ball attachment wouldn't work well so long as you incorporate the side float.

They are brilliant devices, and I use them all the time on my CNC mill except when space limitations preclude them as they are bulky. In those circumstances I use a standard holder (with end float) as although I'm set up for rigid tapping, I never entirely trust it !

PekkaNF:
Kings ransom :lol: Still - quite right.

I also saw a QC collet with drill chuck taper. Seems usefull, but pretty expensive for what it is. Maybe another project. I happen to have two extra chucks that has thread mount.

Pekka

chipenter:
Are these any good the postage is right https://www.banggood.com/Tapping-Chuck-ISO-Standard-GT12-M4-M8-Overload-Protection-Pneumatic-Tapping-Collet-Chuck-p-1401903.html?rmmds=search&ID=514217&cur_warehouse=CN .

PekkaNF:
I have bought some chinese here

Adapters:
https://toolsmach.com/en/82-tapping-adapters

But their chuck is pretty long, as you see:
https://toolsmach.com/en/tapping-head-sets/651-tapping-head-set-thread-range-m3-m12-morse-3-ggz.html

Therefore my plan is make one shorter (without that much axial float) - if I can't buy one at reasonable price.

I would resorts paying Kings Ransom (still funny  :lol: ) if I had really expensive CNC machine or expensive parts, but I got neither.

I remember in history that during crusades least one kings ransom was paid, but dictionaries don't support that...this may be totally unrelated:
https://en.wikipedia.org/wiki/Richard_I_of_England#Captivity,_ransom_and_return


Pekka

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