TVP,
you mean the cut-off value I think.
ISO 4288 recommend these cut-off values:
Ra cut-off
<0.02 -> 0.08
0.02 - 0.1 -> 0.25
0.1 - 0.2 -> 0.8
2-10 -> 2.5
10 -> 8
Value 4 means an expected Ra between 2 and 10.
In this case it will not be a critical value because...
It seems that Pt 12 is the maximun allowable value of Pt.
We don't understand the mean of the number 4.
We checked the roughness of the samples and we found these values:
Ra=1.2 Pt=6.5 measured on 1.75mm lenght.
Yes it is a metal part.
I don't know the roughness standard they are using, but our customer is a german supplier of a big automotive brand.
On some surface of the piece they require Rz16.
Hi, does someone could help me, please?
An Automotive customer ask us for a mechanical part made by turning.
The surface roughness required is 4/Pt12.
Does anybody know what it means?
Thanks.
Hi, I’am a new user.
I’m trying to draw a tooth gear but I don’t have formulas and data table to do this because ( I think ) it is a Stub tooth gear.
These are the straight spline specification:
- Tooth profile Involute
- Module 0.7
- Numb. Of teeth 26
- Pressure angle 45°
- Pitch diam. 18.2 mm...
