initial setup takes about 45-60minutes you are right on that, this is a one time operation, then put a stack of blanks on and hob them, change the stack and hob the next batch, the time to change the batch is about 5minutes tops, so lets do the math:
10minutes hobbing time per batch
+
5minutes changing time per batch = 15minutes per batch
60/15 = 4batches per hour * 5gears in a batch = 20gears per hour
2hrs/20gears/hr=6minutes per gear if you machine 1 batch
3hrs/40gear/hr=4.5minutes per gear if you make 2 batches and so on
Chuck Harris <cfharris@...> wrote:
lothar baier wrote:
still trying to figure out where you get the hour for hobbing the gear from !
Does your machine set itself up as you change gear types?
As I said, one gear will take a couple of hours to make, there
is some economy of scale, but you are unlikely to want to cut
more than ten gears in a production run.
....
those are small parts with fairly large DP in soft material, according to some preliminary calculations based on
delrin and my machine handbook it should take about 10-15minutes to hob 1gear !
The biggest challenge in casting is to get airpockets out, one way is to use a cylinder to push the epoxy into the
form until the material overflows out of a second hole, or you can put the form on a vibrator to achieve this, im not
an expert but i have seen some castings done and thats how they did it.
You use very thin epoxy casting compounds. They flow very nicely.
Once they are in the mold, you hit the vacuum, and draw the bubbles
out for a perfect fill.
-Chuck Harris
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