Beautiful spreadsheet. Very nicely laid out with all the formulas, etc. Way beyond anything I could have done, even in my prime of using Excel. Just getting started looking at it and trying to understand it a bit.

I do have some questions, and perhaps a request or two.

It appears to me that the spreadsheet is sort of "hard wired" for a Supergrind 2000. On the first sheet, "USB Height". Variables "Constand HV" and "Constand VV" (for both the "Vertical Side" and "Horizontal Side") are derived from distance values in the figures, but most of the these are specific to a Supergrind 2000.

I have studied the figures and formulas enough to figure out how I could measure some of these for my T8 and input the values. You have documented most clearly. Your spreadsheet shows the computation for Constant VV (Parameter AA')(cell C16) on the Vertical Side, which is =23+12/2 (cell D16). To my spreadsheet, I have added the values for the computation of Constant HV (Parameter AB)(cell C15) to the adjacent cell (D15), which is: =119.6+12/2-63-25/2.

The one that I cannot find values for, to know how you've calculated it is the Constant VV for the Horizontal Side, cell C50 in the spreadsheet. It is the distance "BC", as shown in the figure. From the figure for the Vertical Side, the distance from the shaft center to the top of the machine would be =23+12/2 = 29, as shown in cell D16, but you do not show values for how to determined the distance from the top of the machine case to the centerline of the horizontal USB sleeve. That should be easy enough, with just a measurement from the top of the USB in the sleeve to the machine case, then subtract 12/2.

My point in torturing this is to suggest that input fields be added so that users can customize the spreadsheets for their own machines, SG, T7, T8., etc. and have those contants computed. I have not looked deeper to see if this sort of thing might apply to the other sheets in the spreadsheet. It doesn't appear so, as those other sheets look to be independent of the machine type.

Please do not take my comments as criticism. This is an amazing piece of work and I thank you for it. I mean only to suggest some things to make it even more valuable and useful to us much more casual users.

Thanks for listening,

Rick