Metric module spline spec value confirmation

[debun]

I’ve been working on a metric module spline calculator in excel and would like confirmation the accuracy. Could someone that has software or published standard confirm the highlighted values? SMAX, SMIN and DFE? Or if you have a standard for another spline I can run it through the calculator and post my values. I compared it to some values I found online, and they were different but I can’t find any errors in my calculator so I don’t know who is wrong.

 

[debun]

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[debun]

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[gearguru]

Nice spreadsheet, debun.
I do not have that standard and I only found one OLD spreadsheet calculating the same what you do, using the same standard but I do not know what revision of it was used. Below is what it calculated for me.
I did not create it, I am not sure how exactly it works.



FILLET ROOT - SIDE FIT
NUMBER OF TEETH 17
MODULE 0.5
PRESSURE ANGLE 30
MAJOR DIAMETER 9.00-8.89
PITCH DIAMETER 8.500
T.I.F DIAMETER (MAX) 7.97
MINOR DIAMETER 7.49-7.60
BASE DIAMETER 7.361
MAX. EFFECTIVE CIRCULAR TOOTH THICKNESS 0.785
MIN. EFFECTIVE CIRCULAR TOOTH THICKNESS 0.771
MAX. ACTUAL CIRCULAR TOOTH THICKNESS 0.773
MIN. ACTUAL CIRCULAR TOOTH THICKNESS 0.759

 

[gearcutter]

The ANSI B92.2M tolerancing system is based on the ISO 4156 system.
The software I use is based on the ISO system.

Smax = 0.774
Smin = 0.759

Results are the same as the ones gearguru worked out but slightly different to yours.
Your base pitch results are incorrect. For a given pitch; as the pressure angle changes, so does the base pitch.

Ron Volmershausen
Brunkerville Engineering
Newcastle Australia

http://www.aussieweb.com.au/email.aspx?id=1194181

 

[debun]

I sorted out the issue. I fat fingered in space width and tooth thickness total tolerance. Thanks for everyones help. I think I have everything sorted including base pitch but can someone confirm

form diameter external (DFE) 7.9681




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