I'm developing a mechanism and I have a doubt that you may be able to help with. what do you think?
I attach some refference dimensions and a picture.
In short, no.
Usually only the hex is "punch".
How many do you need?
My first thought was also broach.
It's really dependent on the question Fredrick asked, "how many"? If you're making a handful or a bragillion. If you're making a handful you'd probably turn, broach and wire. If you're making a bragillion you could header and possibly fine blank although I'm not familiar enough with fine blanking to know the outcome of features that size for that thickness. If you can't fine blank you'd probably hob, broach or something else the teeth on.
In any case if I were making this part stamping it would way down on the approach list.
Chris Saller wrote: My first thought was also broach.
Chris Saller wrote:
can't broach the hex hole without rough cut first - Water cut can be done
I agree, I just didn't go into every detail of how to make the part. In general, from what I see on the outside...I would broach it.
On the hex? I've never heard of water jetting a blind pocket. Doesn't look like the hex goes all the way thru.
Matt Juric wrote: can't broach the hex hole without rough cut first - Water cut can be done On the hex? I've never heard of water jetting a blind pocket. Doesn't look like the hex goes all the way thru.
Matt Juric wrote:
Yeah! youre right ! I didn't look at the bottom view. it's blind hex hole - can't wate-jet cut
must be metal casting ?
More ways then one way to skin a cat. There's probably a dozen reasonable ways to make this part. Depends on a whole lot of variables and information that is not on the print. You might even be able come up with some really fancy way to get this done in a progressive die, but as I said that approach would be way down on the list.
Yes, I'll make that hex through.
Unless there is a good reason no to.
Maybe just buy one?
Can't tell you how many "great Ideas!" I've had over the year that when I did a search or looked around there was already one available. Now whenever I have an idea that is the first thing I do.
Absolutely not !!!
Quantity will make a big difference in determining viability of alternative methods. If of high enough quantity you could metal injection mold (MIM) this part. Otherwise, lost-wax casting if you have cheap labor.
The broaching thing might work OK, but you've still got the tiny details of sharp teeth and acute angles around the outer periphery of the part---those will be very difficult to form mechanically.
Hi everyone, thank you all for your help.
Answering to your questions:
The quantity we're expecting is between 2,000 and 5,000pcs.
We don't need machined quality. In this case our goal is a cheap cost.
The theet thickness is 0.8mm but in fact It'd work any thickness above 0.5mm, so if the process isn't accurate enough to produce ultra-sharp edges, if they fall between that range it's fine meanwhile the basic ratchet shape is formed.
So what whould you do?
Again, thank you!
I'd suggest sending your drawing to a few online proto gear makers... (links)
2K to 5K pieces seems like a good option for the "Loss Wax"/Investment casting process mentioned earlier. Without knowing stresses/wear etc you could get that kind of tolerance and net shape in one shot. You could then avoid the forming process and just cast the entire thing.
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