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Ok so we buy the cast bronze with a lead content of up to 11 %. That bronze material then gets melted in a nitrogen rich environment and is bonded to stainless steel. I am starting to believe it is coming from our cooling process. It is happening very randomly on only certain areas of the parts...

it has up to 11 % lead

Thank you for your responses. I am attaching a picture of the porosity. I am also working on the responses to the questions you guys presented.http://files.engineering.com/getfile.aspx?folder=1cc58ab7-731c-43e9-b641-6c9e1d9300ba&file=lead_pockets.png

Hello, We heat a leaded bronze to 1800 F it cools we then temper it at 725 F. Every once in a while we have a batch that has very bad lead distribution as well as voids. The guys in the shop say it always happens in the spring. Could barometric pressure or humidity play a role in the dispersion...

Hello, I am trying to trace the outline of quite a few things and i need to scan them and import into pro e as to have them laser cut. Does anyone know how to do it if its even possible? Thank you for your time.

I do not know the specifics of the broach, the person who was working here before did and the broach company will not release a drawing as of right now. We did try to take less material out per tooth and it didnt help. We have found taking bigger cuts when reaming this material prevents tool...

Thank you guys for your reply, The broach is made from PM4 about a 64-66 Rockwell C. The part is made form spinodal bronze AMS 4596 with a min 30 Rockwell c. Its fairly hard and its very abrasive. The spline we are pulling the broach through is about an inch in length. There is not much "meat"...

Hello, We are creating a spline with a pull through broach and a tolerence of .001 in spinodal bronze. The broach will do the job for around 20 to 30 parts then it out of range. My main question is should we be completely submerging the part and tool or is cutting oil flow over the top of the...

Thanks the unit that is in question is about .225 in thick so.. im not sure if this is thin enough so that thermal expansion wouldnt affect drasticly. So the nitrided surface should have a different expansion rate correct? Thank you for your time have a good day

Hello, I am working on a project that currently uses a LN2 bath to chill shafts for an interfearence fit. The shafts are made out of 15-5 stainless steel and need a core temperautre of -60 F to assemble with the outside component. The question I have is the shock on the steel and its affects on...

Hello, I am working on a project that currently uses a LN2 bath to chill shafts for an interfearence fit. The shafts are made out of 15-5 stainless steel and need a core temperautre of -60 F to assemble with the outside component. The question I have is the shock on the steel and its affects on...