3 Attachment(s)
Simple version of tapping head
Quote:
Originally Posted by
tonyfoale
I have formed an idea for a simple single piece design for a square driver, which should solve the slipping problem that I get sometimes and only take 1/2 hour to make.
My other tapping head, an AH made in the US, takes up to 1/2" shanks which means up to 12 mm for me.
Canobi,
Thanks to your pix and description I was inspired to make a positive drive on the tap squares. i didn't attempt to copy the stock setup that you have and I went for a very simple to make implementation.
1/4" is the largest square that I have measured on my 8 mm and smaller taps, so I broached a 1/4" square cross hole in a loose fitting bar. From one end I drilled a hole to take a plug that will bare on one side of the square clamping the tap end. I tapped the outer portion of the plug hole for a clamping bolt to push on the plug.
Attachment 22546 Click thumbnails for full size.
Sketch showing the pieces.
Attachment 22544 Attachment 22545
Photos of the actual implementation.
As the bar is a loose fit in the tapping head it will self centre on the tap square but still provide a positive drive.