Metal Casting Zone

Thanks Wickee! Great info, I appreciate it.

I have found a few casting books on-line, which I have ordered.

Thanks guys.

Zinker

happy to help.
hope you find the info you need. let us know what you find out.

those are ejector pin locations

Hi Kin,

Thanks for the confirmation! I checked out your website, looks like some great info and some great products you produce. I looked around a bit on there to see if I could see any similar products you produce with similar pin marks, but didn't see any. Do you have any available somewhere you can point me to?

One of the big questions I have on these ejector pad marks is that they are each at different elevations. Sometimes they are flush with the back surface of the badge, sometimes they are a little recessed and sometimes they are a little higher than the surface of the badge. I have a few of these badges and each pad is at a different height and they always vary. I was just wondering how it is possible to get the different heights of the pad each time? If this was done with steel ejector pins that are spring loaded, I would think they would always sit at a consistent location each and every time they are used. Can you verify that?

Thanks

Zinker

I think because of how old the badges are and the mold being built during war time the tool makers were not too concern about the pin heights being the same. Maybe being a few thousands off may have been good for them.because the marks on the badge being on the back side of the badge. Or it could have been how the mold was built. I being a mold maker having built molds had experiences like this.

Zinker wrote:
Hi Kin,

Thanks for the confirmation! I checked out your website, looks like some great info and some great products you produce. I looked around a bit on there to see if I could see any similar products you produce with similar pin marks, but didn't see any. Do you have any available somewhere you can point me to?

One of the big questions I have on these ejector pad marks is that they are each at different elevations. Sometimes they are flush with the back surface of the badge, sometimes they are a little recessed and sometimes they are a little higher than the surface of the badge. I have a few of these badges and each pad is at a different height and they always vary. I was just wondering how it is possible to get the different heights of the pad each time? If this was done with steel ejector pins that are spring loaded, I would think they would always sit at a consistent location each and every time they are used. Can you verify that?

Thanks

Zinker

Whickee920 is right the original mold has a lot to do with the ejector pin heights and variations of heights. Long ago we did not have digital equipment and CNC machines.
Pin locations and heights were not as consistent as today. The pin lengths are only one of many factors that can effect the height or depth of those pads. Here are a few reasons the pad can vary:
1. Pin length not controlled.
2. Pins not cut straight or ground flat on ends.
3. Pin plate c'bores not cut to exact depth.
4. Pin plate gets loose while producing parts.
5. Pin plate get bent while producing parts.
6. Machine does not hold the pressure and the die opens during production.

Some of these reasons are more likely than others but they all can happen. As far as showing ejector pin pads on my site.... We do not like to show them because it is a necessary evil in the die casting process and many buyers do not like them on their parts. If you look closely at these photos you will see a few www.kineticdiecasting.com/kdcgallery/index.php