I'm trying to layout a AAx2 battery holder and I'm having trouble with tolerance stackup - I just can't see it logically in my mind.
Each lead is spec'd at 0.81mm +/- 0.25mm. Assuming my PWB manufacture can drill within 0.25mm, I think that means I need 1.31mm +/- 0.25mm for my layout drill hole and 2.50mm diameter for my pad should be sufficient.
What I'm really having a hard time with is if drill holes should be made bigger due to tolerance stackup. The distance between the two drill holes is 14.99mm +/- 0.25mm. I think that my drill holes need to increase another 0.125mm to 1.425 +/- 0.25mm. But I'm not sure if this is correct.
I'm not a mechanical guy - my brain doesn't work this way.
Is this right?
Each lead is spec'd at 0.81mm +/- 0.25mm. Assuming my PWB manufacture can drill within 0.25mm, I think that means I need 1.31mm +/- 0.25mm for my layout drill hole and 2.50mm diameter for my pad should be sufficient.
What I'm really having a hard time with is if drill holes should be made bigger due to tolerance stackup. The distance between the two drill holes is 14.99mm +/- 0.25mm. I think that my drill holes need to increase another 0.125mm to 1.425 +/- 0.25mm. But I'm not sure if this is correct.
I'm not a mechanical guy - my brain doesn't work this way.
Is this right?