Hi Phil
Is the tap grinding attachment for your Quorn T&CG ? if so I would be interested in seeing the details
Cheers David
Hi David,
I made mine to use on my Union T&C but the principle could be used on the Quorn. My friend who left me the Quorn made one for it but I didn't get that when I inherited it. I'll see if his son can lay his hands on it.
Here are some pics of my attachment.
The main spindle slides on DU bushes in the Aluminium housing. The housing is split with jacking and clamping screws to adjust the fit. The spindle is 25mm silver steel and the end is bored 2MT. I bonded on a piece of steel on to screw cut a Myford thread so it will take Myford collets.
I originally made this for doing the flutes of end or slot mills.
The ring with all the tapped holes is pivoted about two points turned on the ends of the socket screws with lock nuts.
The aluminium block on the spindle has 6 holes - 4 @ 90 degrees and 2 @ 120 degrees so can be used with 2, 3 or 4 flute taps.
The face of the ring is only about 1mm wide and is cut away for 180 degrees.
In use the grinding wheel is set at the correct angle for either a taper, 2nd or plug tap. The angle of the ring has to be adjusted depending on the diameter of the tap and the angle of the taper so needs a bit of experiment. (The idea of all the tapped holes was so that I could use a pointed screw in each of the holes which would locate in a small centre drilled hole so I coul easily repeat settings for different taps - I never got round to drilling all the holes and just use one grub screw to lock it in position.) (In an ideal world the ring would be part of a helix.)
You push the bearings against the ramped ring and rotate it. When the bearing drops off the ramp should correspond with the flute of the tap.




Does this make sense?
A 1" ER Collet extension spindle would fit nicely in the Quorn. (If you can get such a thing.)

Phil.