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Feb 28, 2013 6:24 pm
Feb 28, 2013 6:24 pm
Subject: Re: DB3L Rear hub serrated drive
Thanks Mark
I know what you mean about photos; 200 K is smaller than usually taken and either you photo-reduce or set the camera to a small frame size and hope it is a small enough file
About serrated drives, I wonder how many DBLs are about to fail
At wheel lock up or wheel spin a torque of about 1000 lb-ft is transmitted. For a 1.575 OD 0.75 ID shaft this calculates to 15.45 KSI
A spline has 50% area and the serrated version 25% area so the stress can reach 62 KSI . As the hub appears to be a low carbon steel this is asking for problems even under normal driving conditions
May be we should advise our co-owners to check the tightness of their 3/4 bolts!
Ken
Thanks Mark
I know what you mean about photos; 200 K is smaller than usually taken and either you photo-reduce or set the camera to a small frame size and hope it is a small enough file
About serrated drives, I wonder how many DBLs are about to fail
At wheel lock up or wheel spin a torque of about 1000 lb-ft is transmitted. For a 1.575 OD 0.75 ID shaft this calculates to 15.45 KSI
A spline has 50% area and the serrated version 25% area so the stress can reach 62 KSI . As the hub appears to be a low carbon steel this is asking for problems even under normal driving conditions
May be we should advise our co-owners to check the tightness of their 3/4 bolts!
Ken