What spline is this?? 2

[Madness42]

Hello all.

Appologies in advance, this seems too much of easy question, but its been giving me real trouble.

I received a spline with these approximate dimensions.

10 Splines
OD 46.2 mm
ID 39.5 mm
Looks like an involute spline.
I am not sure whether it is metric or imperial.

Does anyone know what spline it is, or where I can find out?

Also an Inventor/AutoCAD drawing would be very useful if you could point me in the right direction.

Thanks in advance.
Madness

 

[dimjim]

It looks like it might be a 6 Diametral Pitch Spline
or a 6/12 spline. Probably a 30 degree involute
spline.

 

[lbmakem]

hi
do you know its country of origin this could help identify if its Module or dp, its not a standard BS3550 spline nor a ANSI B92.1 as the depth is shallow by almost .100" to both of these. its the shallow depth thats bugging me it could be a none standard spline/gear, is there any other info that you can get from it.

 

[gearcutter]

INVOLUTE SPLINE CALCULATIONS TO DIN 5480

nominal diameter dB mm 47
number of teeth z 10
normal module m mm 4
pressure angle a 30.°00´00´´
centre ( F=side fit, O=Outside, I=Ins ) F = centre side fit

Spline Description DIN 5480 - 47x4x30x10x11H 9h

External Spline Internal Spline
Shaft / Hub Description DIN 5480 - W 47x4x30x10x9h DIN 5480 - N 47x4x30x10x11H

tolerance DIN 5480 9h 11H
profile shift x * m mm +1.3000 -1.3000


addendum coeff. Standard=0 / 0.000 0.000
addendum coeff. hap0* 0.550 0.55
tip-diameter da mm 46.200-0.160 (h11) 39.000+0.160 (H11)
standard pitch diameter d0 mm 40.000 40.000
Root form diameter dFf mm 39.080 max. 46.280 min.
root diameter df mm 38.200-0.923 47.000+1.042
base diameter db mm 34.641 34.641
tooth thickness tolerance T µm 71 140
TE µm 45 90
T-TE µm 26 50
Ase / Aei µm 0 0
Asi / Aee µm -71 140
AseE / Ae µm -26 50
radial runout Fr µm 36 71
tooth thickness s mm 7.784 4.782
working tooth height min. hzt mm 3.440 3.440

base tangential length over / between 2teeth 3spaces
Finish. dimension mm 19.486 - 0.023 30.369 +0.121
- 0.061 +0.043
mm = 19.425÷ 19.463 = 30.412÷ 30.490

dimension over / between pins mm pin ø 10 pin ø 6
Finish. dimension mm 59.393 - 0.032 35.413 +0.220
- 0.086 +0.079
mm = 59.307÷ 59.361 = 35.492÷ 35.633

backlash mm 0÷ + 0.183 0÷ + 0.183

 

[mog69]

Crikey !

 

[dimjim]

Go gearcutter.
I gave you a star on this one!

 

[Madness42]

Thanks all. Especially gearcutter. Gave you a star too!

Its not correct. But its about as close as I think I am going to get.

But here's a little more info anyway.

Country of origin. Italy. (not much help)

Shaft OD 46.2
ID 31.5

Hub OD 46.4
ID 39.65

Yes these are correct. Very deep on the shaft.

 

[gearcutter]

Can you confirm if the measurments across pins or tangential span, I gave, are the same on the samples?

The original shaft minor diameter was 39.5 but now you say it's 31.5; are you sure?

Is the root of the external "full fillet" or "flat root".

The hub's major diameter suggests that the spline is "top fit". Is there tooth tip chamfering on the external's teeth?

 

[Madness42]

Appologies. I gave approximate dimensions for the hub first time round.

The hub looks like it is designed for flat root, but the shaft looks as it is a very deep fillet.

There is no chamfering on the external teeth. But then I also doubt that the shaft is of the original design.

It might very well be "top fit".

Where did you get your info from or is that a secret?

 

[gearcutter]

Again, can you confirm if the measurments across pins or tangential span, I gave, are the same on the samples?

To confirm, based on your dimensions, is there really 4.075mm clearence between the shaft minor diameter and the hub minor diameter? This seems like an excessive amount.

Calcs were done using Excel.