HEIDENHAIN iTNC 530 HSCI - Page 742

742 HEIDENHAIN Technical Manual iTNC 530 HSCI
Example:
Z
1
= 300 mm (at 20 °C)
α
steel
= 11.5 · 10
–6
1/K (coefficient of expansion of steel)
Wxxx: Temperature measured by a Pt100 thermistor
"TEMPCOMP" = 300 * 11.5e–6 * (Wxxx – 20)
Better would be:
"TEMPCOMP" = 3.45e–3 * (Wxxx – 20)
If the front part of the spindle gets warmer by 40 K, it results in a spindle length
growth of
Z
1
Δl 300 mm 40 K 11 5,10
6–
1
K
----⋅⋅⋅ 0,138 mm==