When I had a drill-mill with MT2 tool holders I much preferred using endmills
with Weldon style flats. Took much less tightening of the set screw to get them
to stay put. I had to really twist hard on my T handle hex keys to ensure mills
with flat flats wouldn't work loose.
Weldon flats are one of those superior things like the Jarno taper which one
wonders why didn't eliminate another method long ago. Weldon flats hold better
with less set screw torque. Jarno tapers are all precisely the same angle and
their sizes don't overlap so a whole set can be cut from one bar of stock, very
unlike Morse tapers.
On Thursday, April 18, 2019, 8:16:28 PM MDT, TJoseph Powderly
<[email protected]> wrote:
Greg thanks
On 04/19/2019 08:36 AM, Gregg Eshelman via Emc-users wrote:
>
> The Weldon style has a set screw flat that's angled toward the cutting
> end.
> Tighten the set screw on it and the tool is forced upwards until the
> deeper end of the flat contacts the side of the set screw.
> That makes the too resistant to shifting axially, preventing loosening
> or shifting of tool length.
Thanks, I can see it working now and have used them on shank tool
holders ( Bports etc )
So, the set screw squeezes the angle to bottom out the shank in the bore.
And, the end of shank and bottom of bore must be clean and solid.
I recall doubting what I had used ,
trying to jiggle and twist the tool with set screw just biting.
They didnt 'feel' like the tool was constrained,
The bore felt good, but the twist and length feature did not.
I didnt chcek but would expect the one cheek of the Weldon to have marks
from the screw.
But, considering the shop owner,
I was likely using cheap stuff from MSC ( who was down the street Elk
Grove Illinois ).
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