Why are they no longer sharp...Driving bands

[runfiverun]

go back and read my posts on this thread I already explained it.

[lablover]

go back and read my posts on this thread I already explained it.

Yup, you sure did. Clearly it didn't sink in...LOL. What can I say, I was frantic and not in a good mood... I do appreciate the advice

[DerekP Houston]

go back and read my posts on this thread I already explained it.

Sometimes (at least for me) reading and doing are two separate things. I'm a better hands on learner.

[guicksylver]

I've seen that little volcano action going on before..not enough venting.....try loosening the sprue plate so that it swings closed with it's own weight....and then cast a couple dead center...I've found that NOE molds come with the sprue plate just a little too tight ...especially if you use sprue plate lube...it seals the air from escaping out between the top of the mold and sprue plate..you end up with round bases as well if it's too tight...some guys even relieve the upper edges of the mold ever so slightly to give it more venting and produce sharper bases...

[runfiverun]

yeah,,, sometimes you just have to see it for yourself
I have a mold here I am fidgeting with bit by bit the back cavity will leave a little swirl in the base if I fill it too quickly.
that's clearly a venting issue.
I worked over the plate and the scribed vent lines which fixed the front cavity.
I need to break the edges of the back cavity to allow more air to flow out of that cavity.