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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Gearbox pinion hardness
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<blockquote data-quote="Sebastian Huber" data-source="post: 109583" data-attributes="member: 2027"><p>Hello Vincent, </p><p>confirm HRC 62 as John said. Important is demand for deapness of hardening coat. This alloy 14NiCr14/15NiCr13 (both are sold under 1.5752) is perfect for coat hardening but be aware of the risk that details of your profile will get full through hardening when smaller/thinner than 3 mm. </p><p>Do you have some machining allowance in the hub bore for grinding job? </p><p>Hard Surface after grinding of 0.6 +0,2 mm is enough. So add thickness of machining allowance and you`ll get demand for deepness/thickness of carbonizing zone. </p><p>Should be 0,8 +0.2 mm, maximum +0,4. HRC 60 +2. </p><p></p><p>For pinions, even for crank pin or big end pins I use nothing but 1.7147, 20MnCr5 (old German name EC100) with same demands for head treatment.</p><p>Strength of core is a bit lower but this provides reduced risk of cracking by micro cracks caused in hardening proces. </p><p>Crucial is whether the company for heat treatment is familiar with the material you bring. </p><p></p><p>Sebastian</p></blockquote><p></p>
[QUOTE="Sebastian Huber, post: 109583, member: 2027"] Hello Vincent, confirm HRC 62 as John said. Important is demand for deapness of hardening coat. This alloy 14NiCr14/15NiCr13 (both are sold under 1.5752) is perfect for coat hardening but be aware of the risk that details of your profile will get full through hardening when smaller/thinner than 3 mm. Do you have some machining allowance in the hub bore for grinding job? Hard Surface after grinding of 0.6 +0,2 mm is enough. So add thickness of machining allowance and you`ll get demand for deepness/thickness of carbonizing zone. Should be 0,8 +0.2 mm, maximum +0,4. HRC 60 +2. For pinions, even for crank pin or big end pins I use nothing but 1.7147, 20MnCr5 (old German name EC100) with same demands for head treatment. Strength of core is a bit lower but this provides reduced risk of cracking by micro cracks caused in hardening proces. Crucial is whether the company for heat treatment is familiar with the material you bring. Sebastian [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Gearbox pinion hardness
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