Summary for shot peening dimensions Discussion
shot peening dimensions can change, and the thread warns that the effect may matter a lot when tolerances are as tight as ±0.0005 in. J. R. Kightlinger asked whether shot peening would alter a previously machined 2024-T42 aluminum part and, if so, by how much. AF Kenton replied that shot peening can change dimensions depending on the media used, intensity, coverage, and other process variables, so some dimensional change should be expected with such a small tolerance. He advised discussing the job more thoroughly with an expert from Metal Improvement rather than relying on a generic estimate. The discussion does not give a numeric change for 2024-T42 aluminum, only a caution that the outcome depends on process details.
Q. Tolerances are within plus or minus 0.0005 inches
Does shot peening change the previously machined dimension on a part? If so, how much on 2024T42 aluminum?
J. R. Kightlinger
– Lincoln, California, USA
2003
 | A. Yes it will effect the dimension. How much depends on the metal peened, its hardness, the type of shot, the intensity (velocity) of the shot, the angle and the duration. I can not say that I have ever heard of aluminum being shot peened. It will also change the surface finish of the part. James Watts A. Answer yes! How much depends on: 1. type (material) of shot, 2. size of shot, 3. the force or pressure, 4 the position or distance of the part in relationship to nozzle. Lastly, the type of equipment, be it vacuum, pressure, or airless wheel systems, will also have an effect on the final finish and/or dimensions.
A. Shot peening can change dimensions, depending on the media used, intensity, coverage, etc. The tolerance that you stated is quite small, so I would imagine some change. You would be best to more thoroughly discuss this with an expert from Metal Improvement. Contact them through their website. Toby Padfield |
