I've been doing some research on mold making lately and have a couple of questions I could use some help with.
Shut-off land - for sealing of the cavity, right?
How wide should the shutoff land be? Do I make it the whole insert? If so, how big should the insert be compared to the part?
Should the shutoff land be .001" above the A and B plates for ABS plastic? What about the runners? should they have their own shutoff land? or just keep them flush with a and b plates and use the .001" to vent the runner?
I have attached a pic to give you an idea what I'm talking about.
One more question. Can I make have the mold out of steel and the inserts out of something like QC-7 to use for runs of 5000 or so? The parts are small (2"x3".5") electronic enclosures.
What are the advantages/disadvantages to having the base out of aluminum vs. steel for this application?
Thanks,
David