1 minute ago, J.R. said:

 

Not missing any theory, you have to learn and understand the basics like a gear tooth will not mesh with another of a different modular pitch be it a pinion gear or a rack (a straightened out pinion) in order to work with, specify and design geared systems.

 

It is not hard to tell what this is about, I wish to understand, others have no problems in helping me do so in a civil manner.

Not trying to be impolite but in 2020 you are asking about technology which is available since the late 90's early 00's in a way that implies doubting it really is what automotive manufacturers claim it is, all while theoretically being able to comprehend the terminology and concepts involved so it was a genuine question from my side, don't be too sensitive about it.

So, what would you call this gearing then?  Would you say it doesn't feature a variable ratio as (universally) claimed?



 

PS. Nevermind the last question, I saw you replied to this by editing your post which at least seems to make things clearer.

I had already editted my previous posting adding that that diagram helped the penny drop & also thanked you.

 

Yes variable ratio, but the modular pitch (rolling distance) remains constant, the gearing terms were misused in the earlier examples

16 minutes ago, J.R. said:

I had already editted my previous posting adding that that diagram helped the penny drop & also thanked you.

 

Yes variable ratio, but the modular pitch (rolling distance) remains constant, the gearing terms were misused in the earlier examples

Trying to understand where the misunderstanding lied, I believe "pitch" in the one external reference a couple of posts before, was used for "diametral pitch" (number of teeth per inch of the pitch circle diameter), as opposed to module which i assume is what you were referring to?

TBH its so long ago and my brain has since atrophied, you remember the basics, the principles, the fundamentals, things what cannot change but the terminology, units, equations etc fade away.

 

Use it or lose it....................

 

The important thing is that thanks to you and others I now understand how they do it and having used quick-racks for years it looks very desirable especially when combined with a variable assistance electric recirculating ballscrew steering rack.

 

Keeping a straight trajectory on a motorway with an 1.75 turns lock to lock quick rack and pointy rose jointed race suspension requires very fine fingertip manipulation, when you have to react very quickly to an obstacle, an oncoming vehicle in the wrong lane etc you need muscles like Popeye to initially turn the steering wheel double quick, the variable ratio rack with assistance would be superb under those conditions, not as fast to react as the 1.75 ratio rack with Popeye at the wheel but faster for anyone else.