Author Topic: 4 jaw chuck to hold taps  (Read 4569 times)

Offline ivansgarage

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4 jaw chuck to hold taps
« on: August 12, 2014, 07:29:51 PM »
I have been looking for a long time for a drill 4 jaw chuck to put on my tapping machine
and came across this on amazon.

Fuller Tool 890-1072 12-Point Reversible Ratchet Brace with 4-Jaw Chuck

http://www.amazon.com/dp/B000BDISDC/ref=pe_385040_121528360_TE_dp_1

We will make some king of adapter for this brace, chuck. :headbang:
Ivan's Garage
Web Site  http://ivanbennett.com 
Forum  http://ivanbennett.com/forum

Offline DMIOM

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Re: 4 jaw chuck to hold taps
« Reply #1 on: August 13, 2014, 04:01:21 AM »
Ivan,

Just a little worried on how true the tap will be held (as that brace may have tapered jaws) and how much run-out it'll have.

Have you had a look at Mike's 4-jaw tapping-chuck as mentioned here on MM previously?

Dave

Edit:  OOPS! - just noticed you posted on that same thread immediately below Dr Mike's message I linked to ......

Offline vtsteam

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Re: 4 jaw chuck to hold taps
« Reply #2 on: August 13, 2014, 08:10:18 AM »
Yes bit braces grip tapered square bit ends. This is because end thrust is important.

Why couldn't you use a regular tap wrench for parts? They use a collet closing action. if the collets were replaceable instead of built in (the way a pin vise works) you could make a range of 4 finger collets.
I love it when a Plan B comes together!
Steve
https://www.youtube.com/watch?v=4sDubB0-REg

Offline ivansgarage

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Re: 4 jaw chuck to hold taps
« Reply #3 on: August 13, 2014, 08:23:48 AM »
I have not got the brace yet, its on its way, but I might be able to remove the the taper from the individual jaws, got to wait and see.  Don't ya love it, buy a new tool just to tear it apart.

I have the drawing for the four jaw chuck,  they have been sitting on my desk for the 2 years.

Ivan
Ivan's Garage
Web Site  http://ivanbennett.com 
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Offline vtsteam

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Re: 4 jaw chuck to hold taps
« Reply #4 on: August 13, 2014, 08:33:47 AM »
It might work Ivan if you change the jaws. Remember, they grip on only 2 corners, btw -- they are 2 jaw, not 4 jaw. The bit grip length is much longer on a brace bit than it is on a tap.

re. alternative 4 jaw holders:

Another possibility might be to remove the cross bar from a tap wrench, drill a hole in some bar stock to fit the wrench body and attach that to the quill -- maybe with a Morse taper.

The wrench could either be permanently part of the MT blank, by brazing say, or removable with a flat and set screw. The hole would have to be close bored.

Maybe you could also turn the bodies of different tap wrenches to a common size to fit the MT blank. Then you'd need only one taper blank.

This  would allow you to change out different size tap wrenches.
I love it when a Plan B comes together!
Steve
https://www.youtube.com/watch?v=4sDubB0-REg

Offline ivansgarage

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Re: 4 jaw chuck to hold taps
« Reply #5 on: August 14, 2014, 06:46:28 PM »
 :ddb:  Okay guys,  got the brace drill today and couldn't wait to tear it apart.
The taps fit nice and snug with no movement.  I got a tap chuck..... :drool:

Check out pics. got explanations on pics.

Ivan
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Offline vtsteam

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Re: 4 jaw chuck to hold taps
« Reply #6 on: August 14, 2014, 08:07:58 PM »
Hmm, mine only has two jaws with a vee-groove in it. Yours has 4 -- much better!
I love it when a Plan B comes together!
Steve
https://www.youtube.com/watch?v=4sDubB0-REg

Offline Stilldrillin

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Re: 4 jaw chuck to hold taps
« Reply #7 on: August 15, 2014, 02:06:11 AM »
That's coming together nicely!  :thumbup:

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!