How do I make a 45deg chamfer to a half cylinder

alexander_tsybulsky

I want to clean-cut half of the cylinder edge by 45 deg. Somethig like this (see the picture). How to do it in the onshape?

KR, Alex

eric_pesty

If your sketch plane for the triangle references the cylinder (using a mate connector on the cylinder would be a good way to ensure this if you cylinder isn't centered on one of the main planes) it should be fairly robust.

Here's a quick example of the split/move workflow (I used "realign" for the split mate connector but you could also rotate it 90deg along X if you cylinder is in a weird orientation)

https://cad.onshape.com/documents/628b8f6747374a48405d71c9/w/0f86188b7e24900cac81e96d/e/839963c7d197fc6e3c1166b8?renderMode=0&uiState=64b19bae695d1875b4ad91fb

eric_pesty

The two easiest options would probably be using a 
Cut extrude (with a triangular sketch) or you could do a split face (with a sketch or just a mate connector) + moveface/rotate

alexander_tsybulsky

Do you mean drawing triangle on a plane, opposite to the part? (it is an option but looks a bit brittle ...)


And could you give some hint to a youtube or tutorial about option2? I'm quite new to the onshape (in fact I'm designing my 2nd part, before I had some minimal experience with freecad, so I'm not on level zero but ... almost there

eric_pesty

If your sketch plane for the triangle references the cylinder (using a mate connector on the cylinder would be a good way to ensure this if you cylinder isn't centered on one of the main planes) it should be fairly robust.

Here's a quick example of the split/move workflow (I used "realign" for the split mate connector but you could also rotate it 90deg along X if you cylinder is in a weird orientation)

https://cad.onshape.com/documents/628b8f6747374a48405d71c9/w/0f86188b7e24900cac81e96d/e/839963c7d197fc6e3c1166b8?renderMode=0&uiState=64b19bae695d1875b4ad91fb

BenTaylor

@eric_pesty you could do this with a single split feature. Split the part, selecting the top mate connector. Edit the mate connector > Move > rotate around X by 45°. Then deselect keep both sides, and you have a chamfered cylinder. I'd still choose the sketch + extrude method for the most robust solution, but this eliminates one feature. 

https://cad.onshape.com/documents/7afb15aa2c0fd9661f64efb1/w/46157cb2ae2d51eff49252f0/e/f2ebd53c29336bca169bdb2a

eric_pesty

@BenTaylor
True, you can use the split directly, not sure why I didn't show it like this...
Also when I know I am going to do something like this, I try to add line segment in a previous sketch if possible to make the mate connector selection quicker (i.e. without needing to rotate/re-align).

alexander_tsybulsky

@eric_pesty Thanks, that was what I need!

@BenTaylor Could you please detail on the last step of your approach? I managed to have this (below) but it does not cut the shape.

BenTaylor

You're almost there - at the top of the Split dialog window, it shows you're splitting the face. You want to select Part and choose the cylinder to split.

alexander_tsybulsky

@BenTaylor: Thanks ! 👍