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Split parting line draft help
nick_papageorge073
Member, csevp Posts: 818 PRO
Hello, I'm trying to make this exact parting line split (draft exaggerated for clarity). I can make it without issue by splitting the part, drafting each resultant part independently, then boolean union the two back into one part. What I can't figure out is how to do it using the "parting line" option within the draft command. I read the help on that to split the face, and I was unsuccessful with even the split. Would someone be so kind to do it in this document so I can see what you did? Thanks greatly.
https://cad.onshape.com/documents/00ef86a3465d95f1b358b19e/w/b752dc491a31ef71ed32990d/e/ba76bbfe8f1632f72b7bd716?renderMode=0&uiState=643a02690d72e778f044f1a9
https://cad.onshape.com/documents/00ef86a3465d95f1b358b19e/w/b752dc491a31ef71ed32990d/e/ba76bbfe8f1632f72b7bd716?renderMode=0&uiState=643a02690d72e778f044f1a9
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Best Answer
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S1mon Member Posts: 2,980 PROThat will leave a steep shut off. It's possible, but it will reduce tool life. The initial DFM feedback may not have caught this detail, but often when they get into the detailed work on the tool (and there's a PO) then you might get challenged on things like this.
I would recommend doing something more like this (P/L in red):
At the very least, you want the shutoff surface to be 5 degrees, but you have room for a gentle ramp which is better for shutoff. Depending on how you want to do it, you can make the parting line have no mismatch, but it will make the nominally flat surfaces need to warp a little.1
Answers
The issue with the "parting line" option when using two sides is that every edge you pick has to have two faces to draft. In you example you have several edges that only have one "side" to draft.
Here's an example where the split line is higher up so that every edges has two faces to draft:
https://cad.onshape.com/documents/1999d7ea6b53f445e3424de2/w/cb3b4a2a9c5b62df6e253f55/e/8cf017727ba5662130a1120a?renderMode=0&uiState=643a17710db2af427b1a15e7
I would recommend doing something more like this (P/L in red):
At the very least, you want the shutoff surface to be 5 degrees, but you have room for a gentle ramp which is better for shutoff. Depending on how you want to do it, you can make the parting line have no mismatch, but it will make the nominally flat surfaces need to warp a little.
Anyway, I know how to change it now if the toolmaker requests it. thanks.
And yes, I know the "actual" toolmakers cutting the steel don't even look at any parts until the PO is signed. ha ha.