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Gingerbread cutter
pavel_černý444
Member Posts: 6 ✭
Hi,
I need a help, im totally newbie in onshape. i already tried couple basic models with no problem, today i want something, for me, more difficult, and i cant get it working.. :D
on the side of "top plane" need a chamfer, to make it cutting thru the dough. on the opposite side, something like offset ring around the circumference of the cutter to make it stronger, are u guys able to help me ? model is sketched from the image
https://cad.onshape.com/documents/c585495fcac41c41f6564091/w/0ca0338b6b7c3ac0c3e372cc/e/b30d54086b110ef0d299d72e
Comments
The concept of a cookie cutter is simple enough with less complex shapes which you could probably figure out how to do but when you have all these curves and sharp geometry corners its gonna present some challenges.
You're gonna have to study up on the limitations that onshape has with overlapping geometry. and how to avoid/adjust for it when it becomes an issue. It's kind of hard to explain in text. Wish I had a visual saved to share.
The ring around the top while not straightforward was not bad to create but was limited to 2 mm wide due to avoiding overlapping geometry. in certain areas. With some selective fillets prior to making that flange I could probably get it wider. But essentially I created a plane 1 mm from the top of the cutter and split all the outside surfaces using that plane and then thickened those surfaces and added a nice fillet which also needed some tlc in certain areas to accomplish
The cutting chamfer on the bottom is likely a nightmare for the same reasons, but probably not impossible. It might take you down the rabbit hole of surface modeling to accomplish that. I'll play with it some more to see if I can't come up with a digestible method.
Alright I spent way too much time figuring this out. But essentially to get the knife edge I had to resort to splitting the inside perimeter faces with a plane. then delete that face and the bottom face and apply a bunch of lofts carefully playing with connections along the edge to prevent overlapping geometry as the loft traveled along the sharper bends.
I got a sort of passable result with an extrude draft: https://cad.onshape.com/documents/60360e0604edd9a917d342a8/w/4c94d7d2489e941b3c49da9f/e/df0974ea81eaf382f051b854
In my experience, that behaves better than chamfer in cases like this. I couldn't get the blade's edge to zero thickness, but you presumably don't need that in practice anyway.
Good idea Anton. didn't think of that draft option. little heavy on the regen time though. With the surfacing lofts total regen time was 2.6s. with the draft on time was 900% more 27s. ouch lol. Probably not a concern for hobbyist's making cookie cutters
Yep, there are several ways to skin this CAD. Don't know if there's an approach that's not fiddly, though, even with OP's commendably clean sketch.
appreciate it, let me know if u succeed
appreciate it a lot, i’ll have a look at it in couple hours
Yes agreed. nice clean sketch. Only tip would be to constrain the magnitude lines to each other for tangency where applicable.