Adaptor shaft

Quote:

---

Originally Posted by workingonit

85county

I've not argued 'preload' in terms of whether it is partial or full contact (how ever that is defined - although I would be interested in your view of a definition). As you say the weight of the unit has to be accounted for (along with an allowance for heat expansion etc). ...

---

It is not my definition it is industry definition although the industry is degrading with the lack of training, the swapping out of parts rather than repair. Manuals written by manual writers and not engineers. As well as translations made by translators and not engineers.

Quote:

---

Originally Posted by workingonit

When you say the weight of the unit is pushing the bearings apart, I mean you to be saying pushing the outer races away. As you seem to be saying, the races have to be moved in to lift the unit back into positions and into contact, or partial as you are emphasising. As a wannabee, I would say the force required to lift the unit into partial contact situation could be called a 'preload' force. If it is not defined as a preload force, then what is the accepted industrial terminology for this type loading to partial contact and then we may have some agreement.

...

---

It is Not preload, since there is not full contact there is then clearance. Depending on assembly type this is called clearance, or end float, or slap.

Imagine a wheel bearing in a hub, think of a Rockwell axel ( truck) they are heavy. They issue torque settings for wheels on, or wheels off.

NB torquing up a TR set to full contact, is good as long as it is enough given the variables IE assembly. And not so much as to damage the bearings.( easier done than you think). Backing off and re torquing is arguably the wrong way to do it. Backing off a locking nut a given number of Deg is the correct way, since with a known pitch this would give you an actual clearance. IE it is absolute.

Vern.

Here's my diagram showing the uni joint sliding spline...oops...I mean the comparative lengths and positions of the Outcast and Sheldon shafts.

The spline on the outcast is approx 89mm.

Forgot diagram edit

http://www.aulro.com/afvb/attachment...t-imgp3250.jpg

The diagram only works if we assume both our MSA flanges are in the same relative position to our gearboxes - must assume this is the case if both our cases are 173mm. Otherwise, there is something fundamentally different that has not been accounted for - maybe the length of our MSA output shafts?

The long splines in my input gear are approx 70mm length. My Outcast shaft, when looking from the pto cover end, is just 3-5mm past the last of the spline. If my diagram is correct then the Sheldon splines are too far forward to the pto cover to take full advantage of a long spline input gear - unless there is something unaccounted for in the diagram?

Quote:

---

Originally Posted by Vern

Yeah it will steve, the 70mm is measured roughly from sheldons shaft which fits the long spline input gear

---

Sheldon's shaft only had a short spline length, but the rest of the shaft up to the seal area was reduced to spline root diameter so would fit both long and short spline gears but only bear against part of the long spline.
Can't find a piccy of the outcast one, but from memory that was long spline and was still full spline diameter up to the seal area.

IMO it would be preferable to have the longer spline from a wear perspective but I don't have sufficient knowledge to say if that creates other issues with the transition between the splines. AM's one had the seal land on the shaft so different in that respect.

Make sense to you - or only me??

Steve

I suspect if you had a long spline on your input shaft you would be able to take both the long and short spline input gears. The through tunnel would have to be the same in each. Maybe there is an applicable design principle that Sheldong followed that required short spline for short gear and long spline for long gear - so to speak. Wish he was still on line even if not making stuff. Just digging around for a diagram I made when I had both on hand at one time.

Steve, sheldons 10 spline is 70mm long, same length as my new Ashcroft cross drilled input gear spline, the gear in my spare 1.003 trans case spline length is shorter than this, and the broken shaft has wear marks on it from my 1.003 that's in the car, these measure just over 40mm in length.

Quote:

---

Originally Posted by Vern

Steve, sheldons 10 spline is 70mm long, same length as my new Ashcroft cross drilled input gear spline, the gear in my spare 1.003 trans case spline length is shorter than this, and the broken shaft has wear marks on it from my 1.003 that's in the car, these measure just over 40mm in length.

---

My bad. I was thinking the Outcast shaft with full splines up to the seal land was necessary for the long spline input gear. Obviously not.

As I thought - you've got it under control :)

Steve

http://www.aulro.com/afvb/2300425-post512.html May be this will help you workingonit, just another idea for you to draw up.
:D

Quote:

---

Originally Posted by steveG

My bad. I was thinking the Outcast shaft with full splines up to the seal land was necessary for the long spline input gear. Obviously not.

As I thought - you've got it under control :)

Steve

---

Of course I have steve, just need to work out how I measure up the spacer section of the shaft to control the end float. My wee brain is gonna hurt:confused:

85 county.

Nice thread.

So in wannabee terms what I've been calling preload you would prefer referred to as end float, slap or clearance depending on application - fair enough. To be clear on the distinction, what would you see as clear cases of applied preload, what you yourself would call preload - I guess in the context of shafts, gears and their respective bearings?

Don't be silly Vern...sounds like a borg warner...but how bout a freelander viscous coupling...

As steveG says the outcast spline up to oil landing is not necessary. The long spline in the input gear falls in between the collars that stop the bearing being pressed on - and almost the same length as the space between the collars. Anyway, as steveg says you probably figured that.