What is the maximum diameter a bur for placing a post should be?

When determining the maximum diameter a bur should have for placing a post, the guideline suggests using a bur that is one-third the diameter of the post. This approach is crucial because it ensures there is adequate space for the material to anchor securely while maintaining structural integrity. A diameter that is one-third allows for the optimal balance between stability and the ability to adequately surround the post with the necessary material to support it.

Using a bur that is larger than one-third could compromise the surrounding structure, making it less stable or potentially leading to issues with post retention. Conversely, a bur that is smaller may not provide sufficient support for the post. Therefore, utilizing a bur that is one-third of the diameter of the post is considered the best practice for achieving a secure and effective placement. This principle helps in ensuring that the post is firmly embedded and can withstand forces it may encounter, such as weight or movement.