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- Jan 14, 2016

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So I have the BLU-DRO coming soon and I have watched Yurieys video on calibration but it has me sort of confused. This is his formula

X_disp = the value shown on the display

X_real = the real value of the travel

CPI_start = the CPI value used for the calibration

CPI_new = the calibrated CPI you want to know

X_disp / X_real * CPI_start = CPI_new

it doesn't matter what units you use (inch,metric or Norwegian beard length)

Note X_disp / X_real * CPI_start = CPI_new

but in the video he does not divide by 3 he just used the display value to set his new CPI and it adjusts to 3” what am I missing?

The main reason I am asking is that I am going to be using this on a mini lathe with Igaging scales. and don't have 3" travel on the cross slide so it will be necessary to use the 2" dimension for that axis. Another thing is that he seems to arbitrarily chose 30000 for an initial CPI is there a reason? So do I just go by the formula? Thanks for any help in understanding

X_disp = the value shown on the display

X_real = the real value of the travel

CPI_start = the CPI value used for the calibration

CPI_new = the calibrated CPI you want to know

X_disp / X_real * CPI_start = CPI_new

it doesn't matter what units you use (inch,metric or Norwegian beard length)

Note X_disp / X_real * CPI_start = CPI_new

but in the video he does not divide by 3 he just used the display value to set his new CPI and it adjusts to 3” what am I missing?

The main reason I am asking is that I am going to be using this on a mini lathe with Igaging scales. and don't have 3" travel on the cross slide so it will be necessary to use the 2" dimension for that axis. Another thing is that he seems to arbitrarily chose 30000 for an initial CPI is there a reason? So do I just go by the formula? Thanks for any help in understanding

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