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material = Material(
    name='AISI 2010',
    classification='NV(nitrocar)',
    sh_limit=1500.,
    sf_limit=460.,
    e=206000.,
    poisson=0.3,
    density=7.83e-6,
    brinell=471
)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-49-6fb335e20cc5> in <module>
    109 )
    110 
--> 111 p1 = isoPitting(transmission=transmission).calculate()
    112 b1 = isoBending(transmission=transmission).calculate
    113 

~\AppData\Local\Continuum\anaconda3\lib\site-packages\python_gearbox-0.1.2a0.dev0-py3.7.egg\gearbox\standards\iso.py in calculate(self)
    444         zv = self.__zv(pair)
    445         zr = self.__zr(pair)
--> 446         zw_one, zw_two = self.__zw(pair)
    447         zx = 1
    448 

TypeError: cannot unpack non-iterable float object

    def __zw(self, pair):
        rz_one = pair.gear_one.rz
        rz_two = pair.gear_two.rz
        hb_1 = pair.gear_one.material.brinell
        hb_2 = pair.gear_two.material.brinell
        v40 = self.transmission.v40
        v = pair.v

        rzh = ((rz_one * (10 / self.__r_red(pair)) ** 0.33) * (rz_one / rz_two) ** 0.66) / ((v40 * v / 1500) ** 0.33)

        if rzh > 16:
            rzh = 16
        if rzh < 3:
            rzh = 3

        if hb_1 < 130:
            return 1.2 * (3 / rzh) ** 0.15                                                                              # Here it returns a float
        elif hb_1 > 470:
            return (3 / rzh) ** 0.15

        if hb_2 < 130:
            return 1.2 * (3 / rzh) ** 0.15
        elif hb_2 > 470:
            return (3 / rzh) ** 0.15

        return (1.2 - (hb_1 - 130) / 1700) * (3 / rzh) ** 0.15, (1.2 - (hb_2 - 130) / 1700) * (3 / rzh) ** 0.15         # Here it returns a tuple

transmission = Transmission(
    gears=pair,
    lubricant=lubricant,
    rpm_in=1450.0,
    rpm_out=243.5,            # Why is this not calculated automatically from rpm_in?
    n=40.0,                   # This should be called P according to the ISO standard
    l=10000.0,
    gear_box_type=2,
    ka=1.3,
    sh_min=1,
    sf_min=1
)

/python-gearbox-master/gearbox/standards/iso.py in __yb(gear)
    909             return 1.6 * log(2.242 * 1 / srh)
    910         else:
--> 911             raise Exception('External gears require: sr/ht > 0.5')
    912 
    913 
Exception: External gears require: sr/ht > 0.5