Modular Boring Head trouble disassembling

Kazam said:

Hi all,
I'm having trouble removing an Iscar ITS boring head from a milling machine taper.

As Iscar manufactures this it is a modular system with different extensions

i have loosened the main anchoring grub screw , reefed on the damn thing in a manual lathe in low gear and hefty sized stilson wrench with liberal amounts of WD40, my next step will be to use an oxy torch, any thoughts

cheers
Kazam

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gregormarwick said:

ITS-Bore tools are made by D'Andrea and rebadged by Iscar.

The connection is D'Andrea MHD. It is a plain diameter with a shallow face taper shoulder. The screw is a three piece affair that jacks outwards from both sides as you tighten it. It is centre-retained so that it expands equally out either side. It has conical ends that jack out into tapered holes in the female side of the connection and pull the male part onto the taper for location. The plain diameter is a close sliding fit normally, and the taper is far too shallow to get stuck on.

If someone had seriously overtightened the screw it may have gotten stuck in one side and broken the centre retaining mechanism. This would be easily visible on the screw side, but since there is no through hole on the opposite side it might be difficult to tell.

These are very high precision tools - I have to admit the thought of a stilson being employed here makes me cringe, let alone heating it with a torch...

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