Thor, or should that be Zeus?

[JAZZCNC]

With the DWH epoxy, it will follow the shape down to the micron. That is one of the uses of the epoxy and it doesnt shrink. Removing it, well, agreed, that might be interesting.

The Concrete with a tight fit epoxy will provide a lot of strength and vibration damping. I need to check however, on the 4KW spindles, the pictures show that there are no 'lips' on any of the structure, so it can be removed once cast (lets assume its greased or similar). If it has a diameter larger anywhere, this will be the minimum I can do which means that the concrete is just there to provide overall damping and strength to the plate.

Yes Know about the accuracy of The DWH Epoxy but still think will cause trouble and then if you talking Chinese type spindles like 2.2kw how would you clamp it or stop it from sliding etc. Would need plates making or some form of fixture.?

Think I'd be going with more conventional Cartridge spindle into sleeve set in concrete. This will give more options for replacement etc. ie 40 taper
Also why not BT30 for 12K can get them with bearings rated at those speeds and plenty of holders that are balanced for higher speeds.

[Chaz]

Yes Know about the accuracy of The DWH Epoxy but still think will cause trouble and then if you talking Chinese type spindles like 2.2kw how would you clamp it or stop it from sliding etc. Would need plates making or some form of fixture.?

Think I'd be going with more conventional Cartridge spindle into sleeve set in concrete. This will give more options for replacement etc. ie 40 taper
Also why not BT30 for 12K can get them with bearings rated at those speeds and plenty of holders that are balanced for higher speeds.

The idea is that it gets attached to a plate which screws in from the bottom.

At the moment the only reason I have not gone for a BT30 setup is cost mostly. There are numerous on the market but what is the cost to entry - £1K upwards by the time you add the BT30, Drawbar? What about motors? Do you mount from the top and do a direct drive or some form of belt setup?

EDIT, I may do the cheaper route first. I Can always make another 'outer' Z part and swap it out later.

[JAZZCNC]

At the moment the only reason I have not gone for a BT30 setup is cost mostly. There are numerous on the market but what is the cost to entry - £1K upwards by the time you add the BT30, Drawbar? What about motors? Do you mount from the top and do a direct drive or some form of belt setup?

EDIT, I may do the cheaper route first. I Can always make another 'outer' Z part and swap it out later.

Never been able to understand this kind of approach if honest because it ends up costing more than twice the amount and wastes lots of time.
If going to all this trouble surely it's worth paying the extra and doing it correctly first time even if it delays the build for while.?