====== Existing small radius ======
> **Summary:** //When working with multiple fillet radii, we start with the largest values first and progress in order to the smallest radius, to avoid running a fillet off the edge of a surface it is following. This tutorial shows a technique to use when an existing smaller fillet is complicating things.//

=====Small to big=====


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| {{:legacy:en:SmallToBigStart.png}} | The existing fillet is 3mm.  We will add a 4mm filet around the top edge. |

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| {{:legacy:en:SmallToBig01.png}} | Run FilletEdge with 4mm.  It will do what it can and fail. |

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| {{:legacy:en:SmallToBig02.png}} | Extract the two 4mm surfaces, and the 3mm surface. |

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| {{:legacy:en:SmallToBig03.png}} | Split the red surface by isocurve where it intersects the edge of the 4mm filet surface. |

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| {{:legacy:en:SmallToBig04.png}} | Delete the top piece of the 3mm surface. |

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| {{:legacy:en:SmallToBig05.png}} | Untrim the fillet surfaces. |

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| {{:legacy:en:SmallToBig06.png}} | Use FilletSrf to make the curved transition surface. |

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| {{:legacy:en:SmallToBigEnd.png}} | Join all the surfaces to the polysurface, and cap to replace the missing top surface. |

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