How to fasten mate a cylinder into a slot

matthew_roche

Hi,  I want to fasten a linear bearing block into a square slot in a piece.  I know I could make the slot round and then mate would be easy.   However I want it so that cylinder fasten mates with the slot.   I have a diagram of what I want:  I need the cylinder to mate into the slot with the round face in the same plane as the slot face and tangental to the sides of the slot.  it must be fastened to the part.  I cant figure out how to get the correct mate combo.   Any help would be appreciated.
 

dirk_van_der_vaart

Try the Tangent Mate

eric_pesty

Depending where that cylinder is coming from you could add an explicit mate connector to it to make it easier to mate in the assembly.
Otherwise use either a fasten with an offset (make the offset the same as the radius of the cylinder, just be aware that it won't update automatically if you change the size of the cylinder), or use a slider together with a tangent mate (replace the slider with a "pin-slot" if you need to allow rotation)...

See the different configurations in this example:

https://cad.onshape.com/documents/73795c306059d251fcee5536/w/6ae520da9ed4c5308f323eb9/e/de4b071b9aa14ae754891b5d?configuration=List_nWtnKan2OsUWGU=Create_MC_on_part&renderMode=0&rightPanel=configPanel&uiState=63f52db54ad082734fc04034

matthew_roche

Ah Brilliant. the fasten with offset worked and is good enough for my needs.

I would prefer the tangent as it does not depend on a constent offset.   I dont like magic numbers in the drawings.  Would prefer something parameterable.   
I tried the tangent mate but it insisted on making the cylinder tangent with the end of the line.  I need it to be tangent at the center of the line.  I could not figure out how to make tangent mate do that.  Thanks for the reply and help @eric_pesty and @dirk_van_der_vaart.