The most basic and least expensive technique for refurbishing the cutting surface is on an oilstone. There is 'no rhyme or reason' for buying a costly desktop machine to do this sharpening.
In Canadian funds, the costs are astronomical at $3,350.00 or a lower price of $1,450.00. (I never display the tool suppliers' names.)
The engraving blade will have very limited contact with the rotating wheel. There must be a constant supply of a lubricant to keep the blade cool. If there is a power outage, OR THE MACHINE IS AT FAULT, does that mean that you can't resurface your blades?
The proximity is about 6 inches from my face to the stone. Careful examination of the 'graver shaping & grinding' process is essential.
Here you can see just easy it is to move the oilstone without any mobility problems