VMC300 Toolholder question

[m_c]

explanation as to why the groove is missing in the top flange in their catalog

Because it's not a Coventry Easy Change tool holder.

I've just been and compared one to a BT30, and the Easy Change holders have a steeper taper, which would be correct as the Easy Change holder doesn't use a self locking taper, whereas the BT taper usually is self locking and needs force to remove it.
Unfortunately the battery is flat in my angle calipers and I don't have a spare, so can't give an exact angle.

[magicniner]

I've just been and compared one to a BT30, and the Easy Change holders have a steeper taper.

Agreed, but I can't find the taper of the mystery holder, if you can enlighten the group with the exact taper of the mystery holder we could measure the angle of the Coventry Easy Change and compare?

- Nick

[Proteus]

Still looking around :-x
Measured the angle and although it might not be dead accurate, it reads 21 degrees.
(Se Attached sketch)



I just hope Coventry feedback next week will tell me something...

[magicniner]

I've measured one of my Coventry Easy Change at 20 degrees

[m_c]

Standard BT tapers are 7/24, which going by my calculation, works out at 16.26 degrees.

[magicniner]

Standard BT tapers are 7/24, which going by my calculation, works out at 16.26 degrees.

I've measured Coventry Easy Change and BT30 for comparison/reference with a Moore & Wright Angle Thingy, here's the photos -

I used BT30 because it's the "Taper Which It Definitely Isn't" which keeps getting rolled out here, it mystifies me and I was tempted to use a MT3 taper, but I'll go with the flow ;-)

[m_c]

It really wouldn't surprise me if Boxford used a custom taper and holder design, just so you had to buy holders from them.

[Proteus]

I've measured one of my Coventry Easy Change at 20 degrees

This is why i suspect the tool holders to be Coventry.
My measurement was not accurate holding 2 steel rulers along each side and then measure With a School Plastic 180 Degree Protractor.

[Proteus]

I compared it to the BT30 as well and the angle is different.
Besides the taper length on BT30 is 50,4mm(including the 2mm notch), whereas my mystery taper lengt is 32,75mm.
If it`s not Coventry i`m stuck, but i guess i will receive an answer from them by next week.