Hi there 176,
A motor racing engineering guru call Carrol Smith wrote a series of books on the engineering aspects of designing and building race cars and your sort of questions are covered in a way that is useful for any form of engineering, particularly metalurgy and fatigue aspects of design...
Thanks very much for your thoughts,
To David, it's the input gear set which does have a pin and bush coupling, so this is not an issue.
(The following 2 helical gear sets have lower design loads but have never failed) from initial post and there is a pic.
You are right in general though, as an...
Hi Chaps,
I forgot to cover the torsional resonance possibility.
The VF drives ramp up and the gear noise/vibration increases with speed to full speed, so there is no resonance being passed through.
This does not prove there is not one just above running speed which has an amplifying effect...
Hi chaps,
Here are my answers in order of your comments.
The pics are from the manufacturer, and we need to leave them as they are for the forensic part later. So we are stuck with what we have to look at, sorry.
Yes the load has been measured via the VF drive outputs and current/power limits...
Looks like it over writes so here is another one.
I've asked that the parts not be thrown away.
Cheers
Johnhttp://files.engineering.com/getfile.aspx?folder=8f261ff1-ba51-499f-a31b-ad87c5afee09&file=IMG_0532.JPG
Hi Chaps,
Thanks for your input to date and response to your questions.
The pic sent is the only one for the first failure but it does show the tips are completely gone, not just the loaded side.
There was a single tooth fault at a low level, which then increased and decreased several times in...
Hi all,
I do condition monitoring and over the years 3 gearboxes with exact 2:1 reduction spiral bevel gears have failed with spalling of the pinion teeth at the tips only.
The loads are smooth and about 50% of the design loads for this gear pair.
The following 2 helical gear sets have lower...
Thank you for your suggestion, and yes, that is a looming possibility.
The main reason for not going that way is the spline is a nice slight interferance fit on the shaft. Getting the all new compound sprocket internally splined with just the right fit to prevent fretting is an unknown, and...
Thanks very much for your definite positions on this issue of welding.
I'm now thinking of grinding off the hard layer from the relieved face anulus and making a precision relieved anulus of it. Then I can drill and ream about 8 or 10 holes 1/4" dia in it to attach it to a 4140 machined...
Hi,
I'm using a motor cycle engine in the back of a space frame for a single seater hill climb car.
To get 4WD I need to have a stub shaft from the normal gearbox output sprocket and from it use a CF toothed belt to the front axle ass'y.
I want to use a duplex chain coupling and this means...
This is another test please do not reply.
this bit of logic refers to SPM trial.
This bit of logic refers to grinding profilehttp://files.engineering.com/getfile.aspx?folder=84ade6c4-96bb-4d81-8cb4-22ef2d1b7357&file=grinding_profile_SPM_WR_600mm.pdf
Hi Chaps,
Thanks for your contributions.
It seems to me :-
The problem with mild steel is that I will loose the extra strength of the cold drawing process when I weld it as it will be back to hot worked condition (yield 51Ksi done to 30Ksi) and there is no way to correct this.
This is what Q1...
Hi all.
Thank you all for your views which are greatfully recieved.
It's a long time since I did Eng Materials but I did like this part back then and now the need for understanding it really is upon me.
Can anyone comment on my previous Q1 directly please, as this again confirms, or not, my...
I am designing/building a small open wheel hill climb car (bitumen track) with a 1 litre motor cycle engine behind the driver. The driver volume will be a CF tub and the engine volume will be a space frame.
I built one in ’68 from ¾” 1/16” wall mild steel and it is still very successful today...
