Reply To: Upgrading Lead Screw?

#17884
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Cesar
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Hi vicious I had purchased this items at amazon
https://www.amazon.com/gp/product/B017AR5QBS/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1
described as follows 400mm Lead Screw 3D Printer Z Axis Lead Screw ACME Lead Screw 8mm Screw Pitch
Specifications:
Material: Stainless steel lead screw, copper nut
Screw diameter: 8mm
Length: 400mm
Screw spacing: 2mm
Lead of thread:8mm
Range: Reprap makerbot 3d printer accessories
3D engraving machine lead screw 400mm length with nut.
Nut turn an around move 8mm
Package include:
1x 400mm lead screw
1x Brass Nut

The rod for my z axis I could I have used the prusa calculator to determine the correct micro step settings to replace the current settings on the marlin set up you have provided on the site I have not successfully determine the correct rotational amount with the information given on amazon thru trial and error I have approximated that 1600 as a better number than the 8mm 5120 the calculator provides could you illustrate the math followerd to calculthe steps for any given angular pitch