MadModder
The Shop => Tools => Topic started by: ivansgarage on August 12, 2014, 07:29:51 PM
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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:
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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 (http://madmodder.net/index.php/topic,9374.msg104166.html#msg104166) 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 ......
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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.
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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
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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.
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: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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Hmm, mine only has two jaws with a vee-groove in it. Yours has 4 -- much better!
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That's coming together nicely! :thumbup:
David D