No idea how to model this part

servet_coskun

Hi OnShapers, I'm still fairly new to CAD modelling and I'm trying to model my first complicated part. I've tried measuring as much as possible with a caliber, but have had little to no success in modelling the part: https://cad.onshape.com/documents/697604be5aef113d068544b8/w/66b3cc6d39ef9d4ecaf342f2/e/41fceda143bfeb90be08badb

It is the L-arm here seen with 2 out of the 3 mounting screws. Here are some more images

Any advice would be helpful, I only have a ruler and a caliper to do measurements with. Thank you for any help
Btw sorry for the blurry image, my camera had a hard time focusing..

Jason_S

After adding images like @Jake_Rosenfeld mentioned, I like to start with the largest, most driving/characterizing geometry on the object, and worry about the complicated bits later. In this case, the large arm that connects to the steering rack.

Once we have the general shape, measure bits and create the geometry that you use as your datums when measuring the part. 



https://cad.onshape.com/documents/999a88030dcdd61235ca4b72/w/54c613535b4ab82a96d15f25/e/ecde5d51fb89b82162811760

I hope this helps. If it were me, I would use Edit in-Context to make sure the mating surface of the knuckle and the steering arm you have match up correctly.

Also, if you are looking for help, like @paul_premakumar said, check out our Video Library as well as our new Learning Center!

Good luck!

Jason

Paul_J_Premakumar

Hi Servet,

 Welcome to Onshape. We have a variety of video tutorials, which cover the basics of CAD modeling with Onshape. These should help you get started. Check these out : https://www.onshape.com/videos/topic/tutorials.

mbattistello

You have to think thru the part in terms of the basic operations in CAD. Find flat sections that can be converted into sketches and then extruded. Then add things like fillets and holes. 

I took a quick pass at this part in this doc - https://cad.onshape.com/documents/f7825f359a519d2742fa0761/w/0e98713859c2ddc234f7c2cb/e/f670dcc41c5340733d4a8a49

Jake_Rosenfeld

To add to this,

It may be useful here to use a "Sketch image".

https://cad.onshape.com/help/Content/sketch-image.htm

You could take a snapshot of your part as straight-on as possible, trace around the part using sketch tools, and then build the part based off that template.  Here is an example of something like this that I did:

https://cad.onshape.com/documents/ec4d9c75a4f6b2b6741f2799/w/790919b65a6679b9e59ec03e/e/2a1630ebfa945ac5703a4289

Unhide the "Blade Image" sketch to see the original image.

AZΘRÆN

you could do 3 sketches/extrudes. one for each plane and have them intersect and then do a boolean operation to save only where the three meet. you could also do 2 sketch/extrude and then the boolean, then the last extrude and another boolean.

Jason_S

After adding images like @Jake_Rosenfeld mentioned, I like to start with the largest, most driving/characterizing geometry on the object, and worry about the complicated bits later. In this case, the large arm that connects to the steering rack.

Once we have the general shape, measure bits and create the geometry that you use as your datums when measuring the part. 



https://cad.onshape.com/documents/999a88030dcdd61235ca4b72/w/54c613535b4ab82a96d15f25/e/ecde5d51fb89b82162811760

I hope this helps. If it were me, I would use Edit in-Context to make sure the mating surface of the knuckle and the steering arm you have match up correctly.

Also, if you are looking for help, like @paul_premakumar said, check out our Video Library as well as our new Learning Center!

Good luck!

Jason

servet_coskun

Thank you for the feedback guys, I will take a closer look at the video tutorials. Also thank you so much for giving it a try, I really didn't expect that and I have since recommended OnShape to professors and students around campus.