Sure is an old thread ya found!
Some standard ones may be cold formed (particularly the V-type splines found on fine spline Torana diffs as opposed to the squaretooth splines found on coarse spline Torana diffs), I've only ever seen them machined but I haven't worked in a factory that mass-produces them.
One of the problems with the typical production car splined arrangement is that the outer diameter of the splined area is the same as the shaft diameter. This means that you get effectively a smaller diameter axle under where the splines are situated. So you're using excessive material for the same torsional rigidity if that makes sense. Basically you end up with a spline diameter that is undersized and a shaft diameter that is nominally oversized (or both undersized in the case of a Torana LOL) and isn't giving you any strength anyway because that isn't the weakest point
The best way to do a splined shaft is to have a larger diameter at either end of the shaft, with a radius leading into that diameter so that there are no stress concentrations (another problem with the typical production car spline arrangement). If the smaller diameter matches the depth of the splines, then you just machine the splines into that larger diameter, back and forth with an indexing head of some description, until you reach the nominal shaft diameter. This also means that the axle is allowed to 'wind up' a little bit so that the peak destructive forces are spread out over a matter of a very small timeframe which seems to make a difference, and when you have a shaft of this design it ends up being lighter too, which in a diff is bloody important if you actually want to go around corners and get the car to handle as well as possible.
Fine and coarse spline axles
#26
Posted 03 June 2010 - 12:41 AM
#27
Posted 03 June 2010 - 06:59 AM
Take a good close look - you'll usually find that the splined part actually grows a little in outside diameter compared to the machined area prepared for itOne of the problems with the typical production car splined arrangement is that the outer diameter of the splined area is the same as the shaft diameter.
#28
Posted 03 June 2010 - 11:15 AM
With V-like splines, some to appear to grow a little bit (i.e. have the peaks of the teeth above the nominal diameter) and I'm assuming that's because the splines are formed in and that's where the metal kinda grows out to in the forming process. Fair assumption?
#29
Posted 03 June 2010 - 11:48 AM
#30
Posted 03 June 2010 - 01:29 PM
#31
Posted 03 June 2010 - 02:52 PM
#32
Posted 05 October 2010 - 03:28 PM
for example
LH sl,slr slr5000
LX sl,slr ,slr5000,ss
#33 _Spark Eater_
Posted 03 April 2011 - 06:31 PM
what should it cost to recondition a fine spline LSD? I can buy one for 250 that's worn down into a single spinner, but apparently the shafts are hardened, I'll get it if it's gonna be tough enough and not absurdly expensive to fix
#34
Posted 29 July 2011 - 08:41 PM
http://cgi.ebay.com....=STRK:MEBIDX:IT
#35
Posted 29 July 2011 - 09:22 PM
No such thing
#36
Posted 30 July 2011 - 11:05 PM
http://cgi.ebay.com....e=STRK:MEWAX:IT
#37
Posted 31 July 2011 - 10:10 AM
#38
Posted 31 July 2011 - 10:42 AM
#39
Posted 05 August 2011 - 08:00 AM
This guy is saying this is a Torana Banjo axle with 31 splines??? Wouldnt that make it a 9" axle?
http://cgi.ebay.com....=STRK:MEBIDX:IT
He now has 28 spline Torana axles for sale?
http://www.ebay.com.au/itm/TORANA-LH-LX-ORIGINAL-28-FINE-SPLINE-AXLES-V8-/330597199930?pt=AU_Car_Parts_Accessories&hash=item4cf920f03a
#40
Posted 25 October 2023 - 09:12 PM
Is that statement correct?
#41
Posted 26 October 2023 - 05:57 AM
LH / LX Torana fine spline axle = 23 spline???
Is that statement correct?
Pretty sure all of the later banjo and disguised banjo (little salisbury including Gemini) were 23 spline. The early ones were 10 spline. With gradual change-over mid 70's where the final XU1's and V8 Torana went to 23 spline first.
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