50 000 parts fitting in your one hand

[Tr2sa]

If got your attention:

I am looking for a supplier for the parts, material is 1.4301/AISI 304, parts are described in attached drawings. Production quantities start at 1000 parts, yearly need is around 60 000 each. Validation and qualification samples are mandatory. If you have anything to clarify, feel free to ask.

To avoid previous pitfalls at the start:

*Tolerances are metric
*The radii are correct, 0.02 is maximum allowed
*Parts have to be concentric

[zedzero]

Tricky little job....just interested,how do you check the .02 internal radius

[Rapid Tech]

My guess would be an optical comparitor. A tricky job indeed.

[Tr2sa]

My guess would be an optical comparitor. A tricky job indeed.

Correct - the first test is optical compare. The main problem is that the assembly loses critical function if radii tolerance is not met.

[lerman]

Instead of the small radius? I wouldn't think that would impact the function.

Ken

[CNCDesk]

Is an undercut acceptable?

Ron
__________________
Ron Smith
"The Cyber Shop"
1424 Kansas Lane
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Phone: (615) 772-7990

[handlewanker]

Hi, I would think that the quantity and tolerances involved would lend itself to sintering.
Ian.

[Tr2sa]

Unfortunately even small undercut can be cause of unwanted effects in assembled device. Modifications to the parts are not acceptable at the moment.

Is an undercut acceptable?
Ron

[Tr2sa]

Hi, I would think that the quantity and tolerances involved would lend itself to sintering.
Ian.

Sintering is an interesting option for micro manufacturing; I am not familiar with the current sintering possibilities. What I have found, is that lots should be bigger to be cost effective - monthly volumes around 100 000.
Also offered raw surface finish seems to be close but not enough without secondary smoothing operation. In addition to that there are ejector marks, differences related to stress tolerance and wearing.

[handlewanker]

Hi tr2, know what you mean, but when the desire outstrips the ability to satisfy the customer's needs, then it's back to the drawing board to modify until you can.

I was taught this by the chief mechanical draughsman in our drawing office, and it was a rule that he applied to all would be design engineers who made drawings of things that could not be made.

This concept was also applied to some of the designs of parts supplied by Rolls Royce at a firm I worked for in the UK in the '70s, and there were many modifications that otherwise would have made manufacture an impossibility.

At my last employ, before I retired, we had stainless steel sintered parts made that were vibro finished to give the surface finish required, as the volumes exceeded many thousand parts per week.
Ian.

[g-codeguy]

Yeah, been times I would loved to have some of these engineers make parts per their own drawings.

[robinhuxd]

Sintering is an interesting option for micro manufacturing; I am not familiar with the current sintering possibilities. What I have found, is that lots should be bigger to be cost effective - monthly volumes around 100 000.
Also offered raw surface finish seems to be close but not enough without secondary smoothing operation. In addition to that there are ejector marks, differences related to stress tolerance and wearing.

You can try automatic lathe machine that is used to make electricity plug pins. If qty is real, this can be made less than 0.10usd/pc. I do not have this machine but I can help if you are interested. My email is sumomoto@gmail dot com