a.squibload
02-28-2012, 03:53 AM
Finally tried the HP pins in my NOE 429421.
Used the plain pins before, made good SWCs with it.
The HP pins usually release OK, but the mold doesn't want to release the boolits.
Had to apply a little force to get the mold open.
The side of the mold opposite the pins doesn't let go.
That makes the pins drag the boolit out of that side, and leaves marks from the
corners of the lube grooves.
Sometimes the boolit nose got ripped open.
This was all done gently, I'm not a mold beater! (No whacking.)
Alloy is 50/50 soft / WWs with a bit of tin.
Pot was running around 700º, I read laterin the instruction sheet that 600º is recommended
so I turned it down (my burner is kinda hard to adjust).
I tried casting faster, or slower, never got it right.
Since it made good boolits with the other pins I assume it's operator error
relating to HP technique.
Suggestions?
https://lh3.googleusercontent.com/-vt38Suk4rD0/T0yMa0wrKzI/AAAAAAAAAX4/ECmxaPKaPsw/s640/HP%2520mold%2520nicks.JPG
https://lh6.googleusercontent.com/-O90tsBKHfho/T0yMarVXggI/AAAAAAAAAXw/s_nTx3lYFpo/s640/HP%2520mold%2520nicks%25202.JPG
Used the plain pins before, made good SWCs with it.
The HP pins usually release OK, but the mold doesn't want to release the boolits.
Had to apply a little force to get the mold open.
The side of the mold opposite the pins doesn't let go.
That makes the pins drag the boolit out of that side, and leaves marks from the
corners of the lube grooves.
Sometimes the boolit nose got ripped open.
This was all done gently, I'm not a mold beater! (No whacking.)
Alloy is 50/50 soft / WWs with a bit of tin.
Pot was running around 700º, I read laterin the instruction sheet that 600º is recommended
so I turned it down (my burner is kinda hard to adjust).
I tried casting faster, or slower, never got it right.
Since it made good boolits with the other pins I assume it's operator error
relating to HP technique.
Suggestions?
https://lh3.googleusercontent.com/-vt38Suk4rD0/T0yMa0wrKzI/AAAAAAAAAX4/ECmxaPKaPsw/s640/HP%2520mold%2520nicks.JPG
https://lh6.googleusercontent.com/-O90tsBKHfho/T0yMarVXggI/AAAAAAAAAXw/s_nTx3lYFpo/s640/HP%2520mold%2520nicks%25202.JPG