2 part question on PID

Bliksem

Active Member
Purpose of the PID is to get your alloy to casting temp as quickly as possible without extreme overshoot and hold it there as the pot drains. It will always over/under shoot some. Once tuned, PID numbers stay the same till next tune cycle. Some better controllers will try to tune each time the unit is turned on.
completely homogenous takes time at temp and stirring. I usually wait 15-20 min before casting, stir every once in a while during casting, depending on alloy content
Popper, the last piece about homogenous time I observed a few years ago completely by accident and since then have adopted that into my method as well. I had actually started a thread about this phenomenon on this forum and a number of interesting comments were left. I call this the alloy soak time prior to starting a casting session.
 

L Ross

Well-Known Member
I am such a techno-heathen. After my C-19 shot yesterday I wanted to cast up a bunch of XCB's. I was going to use two pots, (older RCBS bottom pours). One had my latest blend, I call it my, "By Golly I'm gonna use up some of this Lino before I die alloy." This consists of ingots stamped WOW, which stands for "Wheel Old Weights" which would be anything I scrounged prior to the 21st Century, and Linotype in a one pound of lino to five pounds of WOW. Unfortunately, the second pot was over half full of a much softer blend designed to maybe expand from my .38-40 and .33 W.C.F. that I threw together last Fall before deer gun season. Then in a fit of political pique, I shot my deer with the politically incorrect option available to me, an AR-15 with a 7.62x39 upper with a jacketed bullet.

Anyway....my casting shack is an old garage with an old milk house spliced onto it. The electrical system is, well, primitive. There are two outlets and one of them is even a three prong! There's fuse box and the system is 15 amp fuses. The problem is I can't plug in both pots, the hot plate, and the lights without over taxing the system.

So I only used one pot with the lino blend in it. My technique is to flip the switch on the RCBS, huh, the switch didn't light up. Plug in the pot, works much better. Then the mould is laying on the hot plate and I go to the window and shoot a bank of targets. Oh looky, the red light is off on the RCBS pot switch. Go stir the melt, and the red light came back on. Wait few minutes, stir again, now the light stays off, ready to cast! So is the red light in the switch my PID?

Upshot was I made two runs and got 20 lbs. of XCB's yesterday. If my math is close that should be over 800 bullets. It's a start.
 

Dimner

Named Man
I am such a techno-heathen. After my C-19 shot yesterday I wanted to cast up a bunch of XCB's. I was going to use two pots, (older RCBS bottom pours). One had my latest blend, I call it my, "By Golly I'm gonna use up some of this Lino before I die alloy." This consists of ingots stamped WOW, which stands for "Wheel Old Weights" which would be anything I scrounged prior to the 21st Century, and Linotype in a one pound of lino to five pounds of WOW. Unfortunately, the second pot was over half full of a much softer blend designed to maybe expand from my .38-40 and .33 W.C.F. that I threw together last Fall before deer gun season. Then in a fit of political pique, I shot my deer with the politically incorrect option available to me, an AR-15 with a 7.62x39 upper with a jacketed bullet.

Anyway....my casting shack is an old garage with an old milk house spliced onto it. The electrical system is, well, primitive. There are two outlets and one of them is even a three prong! There's fuse box and the system is 15 amp fuses. The problem is I can't plug in both pots, the hot plate, and the lights without over taxing the system.

So I only used one pot with the lino blend in it. My technique is to flip the switch on the RCBS, huh, the switch didn't light up. Plug in the pot, works much better. Then the mould is laying on the hot plate and I go to the window and shoot a bank of targets. Oh looky, the red light is off on the RCBS pot switch. Go stir the melt, and the red light came back on. Wait few minutes, stir again, now the light stays off, ready to cast! So is the red light in the switch my PID?

Upshot was I made two runs and got 20 lbs. of XCB's yesterday. If my math is close that should be over 800 bullets. It's a start.
*Thread drift alert*

Are you using those XCB's in a garand? I have a garand I'm going to start casting for this weekend. Starting with the good ol 311299. I have a bunch of other 30 cal molds too. I'll be doing CMP highpower format shooting at 100 yards with the M1. I only need maybe 2 moa accuracy, but the kick is, all my 30 cal molds are two cavity, so I may buy a new one with 4 or 5 cavities. Would the XCB be one of the ones to look for? If I remember correctly it stands for something like "Across the course". Meaning the course of CMP highpower ranges.
 

L Ross

Well-Known Member
*Thread drift alert*

Are you using those XCB's in a garand? I have a garand I'm going to start casting for this weekend. Starting with the good ol 311299. I have a bunch of other 30 cal molds too. I'll be doing CMP highpower format shooting at 100 yards with the M1. I only need maybe 2 moa accuracy, but the kick is, all my 30 cal molds are two cavity, so I may buy a new one with 4 or 5 cavities. Would the XCB be one of the ones to look for? If I remember correctly it stands for something like "Across the course". Meaning the course of CMP highpower ranges.
Herein lies the danger of a faulty memory. My data on my friend Jon's load was not correct. Not dangerous in any way, just not correct. I just contacted him when I had a niggling doubt bothering me. His reply was he got his load from Ed Harris. Bullet, 311299, 34 to 36 grains of 4895 with 1 grain of dacron filler. Sorry for any misunderstanding. I will take this as a lesson to verify before running my keyboard.
 
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Mike W1

Active Member
Popper, the last piece about homogenous time I observed a few years ago completely by accident and since then have adopted that into my method as well. I had actually started a thread about this phenomenon on this forum and a number of interesting comments were left. I call this the alloy soak time prior to starting a casting session.
I'd like to read that thread. My search skills seem be not so hot. A point in that direction would be most appreciated!