Hi,

Silyavski thanks for your input although it seems to me that you might have missed my first post or miss read it. As I explained there my starting point in this cnc machine is an end Mill with the measurements of 250 mm long excluding the shaft and 23 mm in diameter. The shaft is 19.5 mm in diameter so I guess that explains where the Er32 collet comes from. Also due to the length of the end mill the 5 hp spindle is definitely needed. I know this from experience working with ice cnc machines before. We have used a perske 5.5 hp air cooled spindle without any special sealing and 5 years on is still going strong with at least 6 hours run time per day.
Although I might look into special sealing I don't find it necessary as explained earlier there is no water involved at all as the machine and material is constantly at - 5 degrees so all the chips are powder snow... And a lot of it.
Also carbide bits don't work on ice in fact only special bits made for ice work. I have tried all sorts of bits before just to see as ice bits are quite expensive but no luck... hence the price. For instance that 250 mm bit costs 350 dollars and by the time I get it to the UK cost just as much in pounds sterling.
I do appreciate your input and time and hopefully you understand better now what I am up against.
Also the machine won't be in a cell, it will be in a very large freezer in fact my ice studio so even while loading and unloading will stay at that temperature.
My difficulty at the moment is the very large z travel as my material is also 250 mm high and with the bit lifted above it the spindle needs to travel to other areas but would need to work on thinner slabs of ice as well with smaller bits.
Anyway I did not have any free time in the past few weeks to think about it but hopefully will be able to upload some drawings by the end of the week to discuss it further.
Thanks again for the comments.