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I am trying to assemble the parts of Plummer block and draw the half sectional views from the front as given here

I am facing some trouble understanding a few sectional views. In this view enter image description here

I am unable to understand why there are two different radii R32 and R34 marked in the front view of base.

In this view enter image description here I am unable to get why there are two different radii for brass shown R32 and R30. Also which component R38 represent in the front view.

Thanks.

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The semicircle in that front view steps to a larger diameter for part of its length. See the top view for reference:

front/top views showing double dimensions

Again, looking at the alternate view for the second component shows where those radii come from:

front/top views showing double dimensions

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