On Sunday, March 18, 2018 at 3:03:49 AM UTC-4, Perry wrote:


The part is about 2"/50mm wide and just over 1"/25mm tall.
The bottom face is say 6" x 2" = 12" squared.

If the vacuum pump sucks down to say 1/2 of atmospheric then I should
see 12 Sq Inch x 7.5 Pounds/Sq Inch = 90 lb down force.

The angled sides of the mold should prevent the part being thrust
sideways when flycut.


As all four sides are sloped I had thought of using a second aluminium
mold as a vacuum chuck. I would have to machine 5mm machined off the top
to expose the top face of the casting that needs to be machined back. chuck.


Wouldnt it be quicker to simply use a sharp X-acto knife to cut the
flashing away?


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That would remove the flashing but we want the bottom face to be
completely smooth. It's one of those jobs where aesthetics count.

How abouts using a belt sander to flatten the surfaco and remove the flash. If the aesthetics are okay it would be a bell of a lot faster.

Dan