William Ward
Cast Iron
- Joined
- Mar 28, 2003
- Location
- Upland, California,USA
First off let me say thank you again to Marcus and Nobby for the help with the rotary dressing a couple of months ago.
I have a new question about depth control and maybe finding a better approach to what I am trying to do.
I am burning a straight sub-gate that is .550 +\- deep. (Some tools are a bit less, some are as much as .200 more.) The gate itself is .015 dia. with a .002 land between the cavity and the sub-runner or runner drop.
The problem I'm having is controlling the depth of the runner drop so that the .002 land does not come out too long or too short as either of those conditions affect the gate vestige on the part. If the land is too long the vestige is too big from the first shot and if the land is too short the gate will wear oversize in short order which also creates a large vestige.
Currently I am burning the gate from the cavity side as deep as I can(.150+/-). Then I am turning the part over and burning the runner drop from the runner side. I am using one rough electrode to get as much material out as I can and to connect the gate with the runner drop more sooner than later so I can then use the gate to flush from the bottom on the finish burn.
I'm using Copper-Tungsten for both gate and runner electrodes and the work material is CPM 10V at 62 Rc. IonoPlus dielectric.
The rotary dressing solved my location issues as far as keeping the drop and gate concentric but the depth issue is kicking our A!%.
I've tried reaching in with a .016 carbide pin from the runner side to measure the depth but I'm not getting consistent enough results to have much faith in that approach.
I have a new question about depth control and maybe finding a better approach to what I am trying to do.
I am burning a straight sub-gate that is .550 +\- deep. (Some tools are a bit less, some are as much as .200 more.) The gate itself is .015 dia. with a .002 land between the cavity and the sub-runner or runner drop.
The problem I'm having is controlling the depth of the runner drop so that the .002 land does not come out too long or too short as either of those conditions affect the gate vestige on the part. If the land is too long the vestige is too big from the first shot and if the land is too short the gate will wear oversize in short order which also creates a large vestige.
Currently I am burning the gate from the cavity side as deep as I can(.150+/-). Then I am turning the part over and burning the runner drop from the runner side. I am using one rough electrode to get as much material out as I can and to connect the gate with the runner drop more sooner than later so I can then use the gate to flush from the bottom on the finish burn.
I'm using Copper-Tungsten for both gate and runner electrodes and the work material is CPM 10V at 62 Rc. IonoPlus dielectric.
The rotary dressing solved my location issues as far as keeping the drop and gate concentric but the depth issue is kicking our A!%.
I've tried reaching in with a .016 carbide pin from the runner side to measure the depth but I'm not getting consistent enough results to have much faith in that approach.
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