Need Help with some engine parts, Noob

[jmneissa]

Hey I am a newbie to solidworks and have been trying to get my footing for a while. I am currently taking the design of a Bentley BR2 engine book and turning it into a complete solidworks model for later machining. However I am struggling with some thing in it if you guys could help me I would be much obliged.

1. I Need to make and undercut how can I do this? I will post screen shots to show what I am talking about

2. I need to make a round chamfer you can see the 9 sided polyfon and then a circle lightly shaded I need to make a chamfer to go from there to the edge but round the circle not the edge of the polygon.

If you need any more infor please post and ask I would be happy to give you some. Thanks

Matt

[JerryFlyGuy]

Matt, your going to need to post a larger screen shot. Also, just read up on chamfers in the help menu's thats a pretty simple operation.

In solidworks there is no such thing as an 'undercut'.. if you can better describe [larger picture might help also]

j

[jmneissa]

Thanks, Here is a bigger picture, I will give a try at better describing at the top there is a hole bring through all the way now half way through the hole depth and I need to widen the hole to a larger diameter but keep the diameter at the top and bottom. Imagine a can with hole at the top and bottom of a smaller diameter then the can. i need to hollow out that inside space. Hopefully that can better describe it to you. Thanks

[Matt@RFR]

I'm gathering you need a slot on the wall of the ID of the part. If that's the case, you can either do a revolved cut, or a simpler way for someone who's learning is to:

-Create a plane at the midpoint of the part

-On that plane, create a sketch with a circle the same size as the current ID, and a circle the diameter of the slot

-Cut extrude to the width you want the slot.

[JerryFlyGuy]

The proper way to produce this 'undercut' is to do a revolved cut. The basic's are;

Pick a plane onto which you will sketch the cut geometry. Sketch a centerline on the same sketch thru the vertical center of the part. Use this sketch as your revolved cut center line. Do a 360 revolved cut.

I can get you a part file it that's not clear.. are you using '08?

[jmneissa]

That is great it makes sense now, a part file would be great just to demonstrate the concept yes I am using '08. So I am sketching on the top plane I would then create a plane going in which direction? I am guessing going perpendicular to the part that I am cutting? Then draw the center line to match up with the center line on the other plane and revolve the sketch around. please correct me if I have misunderstood you. Thanks so much again.

[JerryFlyGuy]

Heres a file which 'looks' something like yours.. The last feature is a revolved cut. Note, the geometry in the sketch which will be doing the 'cutting' [in this file it's just a simple circle] can be ANYTHING/SHAPE.. as long as it will intersect the existing model geometry at some point in the 360 [or however many degrees the revolved cut rotates].

When you save this file, just change the .zip to .sldprt as it's not really a zip file.. I just changed it to a zip extention 'caus we can't add sldprt files to messages..

Hth

J

[jmneissa]

thanks so much it is great now that I figured that out I think I am going to keep usig this thread if i need help with other engine parts as I know down the road i will probabley have a few more questions. thanks again

[jmneissa]

hey sorry about this but I can't seem to open the file I go into solidworks click open click on it and then solidworks pops up with a message saying the file is corrupt

[JerryFlyGuy]

Hrmm.. not sure why it didn't work for ya.. worked for me when I re-dowloaded it.. anyway.. heres the same file... but this time it's actually zipped..

[jmneissa]

that one worked great! I see your point so all I need to do is insert plane then draw the design on it and then revolve cut feature? Please say if I have missed any steps. Thanks again

[jmneissa]

I inserted a plane a drew the design on it then went up to features and it would not let me click revolved cut. What have I done wrong? Is there some special way of inserting a plane?