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Oversize reamed holes


I have 120 oversize reamed holes. The print calls for .3118" to .3125", my holes are oversize to .3130". Is there an economical way to bring these holes back to size? Material is 1045 steel, the holes are in a a ring 48" in diameter 1.250" thick. The reamed hole is thru into an opening for a length of .280"

Robert Hahn
- Cleveland, Ohio

First of two simultaneous responses -- 2003

That depends on what your customer will allow you to do. You could bore out and freeze fit (liquid nitrogen) inserts or make a new one. IF, your customer will allow it, you could add 0.0004 of electroless nickel (to each side = a 0.0008 reduction in diameter and will keep very nearly the same surface finish. The rest of the part can be masked off to not be plated, but this is a time consuming operation that will add to the cost. Only about half of the EN jobshops will have tanks big enough to handle your part, so plan on shipping it some distance.

James Watts
- Navarre, Florida

Second of two simultaneous responses -- 2003

Not knowing the cost to scrap and make the part again or other possibilities I ignore if the following seems economical, but brush selective plating can do the job. Price can vary a lot depending on vendor, tolerances, overall size of part, complicated masking, etc. You probably can get it done for US$10 per hole or less. There are companies in your state.

Guillermo Marrufo
Monterrey, NL, Mexico

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