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...
Hi Bob,
Thanks very much for your insight and very importantly, practical experience of what happens when you have done this or that.
The sketch is from hemipanters site of his Pantera mods.
I'll make some sketches of what you are saying and have a good think about it.
Can you explain the last...
Hi All,
I’ve only recently discovered this forum, after occasionally posting on the machinery vibration forum. I’m a mech eng and live in Melbourne, Australia
I’m again designing a motor cycle powered rear engined hill climb car, all ball joints.
After reading Ortiz & others again and again...
Thanks very much for your replies.
IvyMike "I'm told this is not the case"
The potential job is in India and I'm relying at this point on what they tell me about the rolls, but like you, I'll leave nothing to chance if I get over there.
To date they have sent end to end profiles to show they...
Hi, this is definitely the sensitivity of the accelerometer used in the vibration measurement. 10 is a very standard sensitivity.
Nothing to do with the actual vibration, as this is normally all allowed for in the measurement chain that leads to the waveforms and spectra in g's or mm/s etc.
Slightly off topic, sorry.
Greg, in FAQ you have a free SLA software package SLARK listed but the site no longer exists.
I would like to try it out rather than use a very long piece of paper as in '67.
A year later the Lotus 49B came out with very similar wishbone lengths especially at the rear...
