I would like to apply the chamfer to the 4 holes below but that would not work because it reduces the material thickness. I want to apply an indent feature on holes with a indent diameter of .375 and a depth of .0625. How can I do that? I've also attached the part file.
,,, Yea,, me too. Not sure why that would be required, but it does look like Russell knows what he is doing.
Hello Russell,.. you could do the chamfers,.. surface offset their faces and then thicken? (image attached)
@Paul Salvador the only problem there is it looks like it produces knife edges underneath. You could put a small fillet rad in but I would hazard a guess the detail would virtually disappear.
When I did the surface offset then thicken, I got this... What went wrong?
I got it thanks guys
FYI.. This is the sort of result you will get with the indent tool. The thru hole has to be after the indent. Uniform thickness but you can see what the thru hole looks like.
Edit:.. Of course you could put a ruled surface on that and end up with this??
Hello,
Since this is a casting (or forging), the sharp underside radius isn't practical.
Also, the top wall is thinner than the two walls, again problematic.
The sharp of the top surface at the chamfer indicates a machine intersection, not an cast/impacted one.
I would probably lean toward a cast/forged (circular?) boss on the underside to add material to eliminate the knife edge (and recover strength) from a machined thru hole and chamfer.
Alternatively, the chamfer and thru hole can be cast/forged in, with the added underside material, if the slop of a cast/forged hole/chamfer is permissible (or w/further processing to true it up).
But also there'd be a rounded entrance to the chamfer, as a form tool would do with sheet metal (at a generally smaller radius for this situation).
What do you think?
Cheers,
Kevin
All good points Kevin. It has been 3 or 4 decades since I have had anything die-cast but I do remember having issues with varying wall thicknesses. Not so sure a boss would be needed if this was to be machine c'snked but if didn't interfere with material flow, shinkage, and what not. too very much I would feel more comfortable with it. Yes, if it was to be formed, or cast in, some radii would be required. I was thinking about adding that into the indent tool..
Certainly points to ponder.
Hello,
If you have control over the flat head fastener spec, then an undercut profile head can be substituted for a std head and the head height difference can be applied to raising the countersink, possibly eliminating the knife edge/thinness of the thru hole.
A #10 std head is 0.127 and an undercut head is 0.081. Not much, but may be enough.
McMaster-Carr has some, but the sizes and lengths are limited.
Cheers,
Kevin
Russell,, This is a chamfer resulting in the dimensions you require.. Do you not want to do it like this? Do you want to form the material?