How long to turn?

[Marshal]

I've got a local company making some parts on a lathe for me, and I'm curious if anyone can give me an idea of how long it should be taking them to make them. The latest ones are a simple pin, 0.1875" dia, 0.75" overall length, with a 0.150" length x 0.063" diameter pin on the end. The tolerances are +/- 0.003", and they're made out of 12L14 Steel. How long should it take to make 500 of these on an average CNC lathe?

[GoetzInd]

Around 15sec/pc w/ a nice finish IMO.

 

Mike

[Marshal]

I didn't think it should take very long. They're cutting them off a bar and leaving a piece on the end and then hand finishing them on a deburring wheel. That seems like a huge waste to me, and I don't have any experience with a CNC lathe

[GoetzInd]

They're cutting them off a bar and leaving a piece on the end and then hand finishing them on a deburring wheel.

 

Very difficult to eliminate this completely if there is no sub spindle available. If the qty. is descent, a swiss shop might be interested and they would fly through those things without any post machining operations.

 

Mike

[workmantm]

They may be limited on RPM due to L:D. High RPM will have that warping and running out that small. Our bar puller takes 10 sec per cycle. I factor that into every job we run. No way to get around that delay. I can see this taking 45 seconds, especially if they are hand breaking the parts off instead of using a parts catcher to prevent damage as the part is removed. Lots of factors on the lathe to consider. This does sound like a good parts for swiss though. Being able to keep the material from warping at RPM is a huge time factor.