Ice sculpting tools

[billbertg]

I have been asked by a chef friend to sharpen his ice sculpting tools. Most appear to be a regular chisel and a couple of v-shaped gouges and one u-shaped gouge sharpened on the inside. Any suggestions on sharpening techniques, specialty jigs and cutting angles. Have been told that ice is harder than most wood and the angles should be stronger. Any thoughts? I am a knife sharpener by trade and do some specialty sharpening on my T-7.
Thanks
Carter