1. ## Lesson 1 proposal/suggestion.

What I'd like to see is a pocket design lesson. Emphasis on placing entities in the exact postion on the screen, trimmed etc. Here's what I suggest for a real world design:

A part that is 4 inches by 3 inches by .75 inches thick. It has four 0.5 inch holes placed in each corner with the centers .75 inches from each edge. In the center of the part is a pocket machined .250 inches deep, the pocket has an approximate shape of a keyhole; an arc with a radius of .490 inches joined with a rectangle of .45" wide and 1" long.

Once drawn, I'd like to see the steps for generating the tool path that only cuts the pocket, not the entire surface & not the holes which must be drilled.

This can & should span several tutorial threads for each step.

Perhaps an inverse of the design where the keyhole is an island instead of a pocket. I know there is more than one way of doing it, using primatives & boolean functions is quick, but I'd like to see it done using the conventional drawing tools. I'll even do homework & practice! Thanks!

2. Well, I have figured out how to spell CAD. I am working on the other one "CAMM" or something like that. I installed the v20 demo of BobCAD and was thrilled that I could open an example file of a bottle. Big question is, "howcome it's only half a bottle?".

3. Originally Posted by rustyolddo
What I'd like to see is a pocket design lesson. Emphasis on placing entities in the exact postion on the screen, trimmed etc.
Sorin has this tutorial. You may wish to contact him or Bobcad about a training course. They are pretty cheap and Sorin gives you several tutorials in a computer video format.

4. Have you looked at Bobcad's web sight.

• The reason that there is only one half of the bottle is because you can't machine a full diameter bottle on a mill. It must be a core (upper half ) or a cavity (bottom half. Just itry to imagine ast the tool goes abover top of the bottle and mills it , now it has to go down below and cut the bottom....alt the top will cut off. If you want to see the whole bottle, rotate the bottom (or upper half that you have and choose "make copy). There you have it...Cheers, a adult beverage of your choice...LOL
Hope this helps. I want to take you guys one the lesson program and actually do video on how to do the key hole example. The problem is that the video file size can be a bit large for an email. Any suggestions???? I can burn it on a CD but now we are talking mailing expenses. I have some clips that will take you from creating the drawing to getting the G code done. Plese let me know of you have any suggestions on how to post them here for you.
Happy New Year to you all!
Sorin
PS: Make sure you wear some type of wrist brace while using your PC... Just got a Carpall Tunel surgery last week on my right hand..Not a fun thing trying to be a lefty for a while.

• you can upload them to a site I read about and then everyone can go to that site and download them . I wil look and find the site for you and post it . It is a free site also.

• www. yousendit.com

you can upload and send emails to those who want it. Then they go to the site and download simple.

• Thanks Ken,
I will check it out and then gladly have there for you guys. I will need a couple days for my hand to get better. I just had a carpall tunel surgery and will like to saty of the PC for a couple days....that if I can resist. LOL
Best wishes to you all,
Sorin

• sounds good . you should let everything heal first

here is my email whenever you feel like doing it let me know and I will defanatly download them thanks

• Hand is starting to feel better......I will start with first tuturial tomorrow evening. That will be on how to draw the part using Bobcad (i will be using V20.5 but V18 or 19 will work the same). The second tutorial will be creating the pocket for the key hole and next how to generate a G code from it. The last one will be for creating tool path and leave the key hole as a island. A fair warning to you all....I was born in Romania and live in the US for over 30 years now but still have an accent. You former students know what I mean....LOL
Best regards to you all and I hope that you will enjoy the class.
Sorin
PS: The files will be posted at www.savefile.com

• Attached is the finish drawing of the part that we are going to work with. It is drawn in 2 D since that is all that we need for this particular part. I have changed from just a plain square for the key hole to 2 lines at 240 and 300 degrees so the part looks more like a "Key Hole" as per your request. I also added some filets to the sharp corners of the inside of the "key hole". The video on how to do this will be uploaded sometimes tonight. Hope you all enjoy it.
Best regards,
Sorin

• Hi Guys,
Sorry it so long to get this done. I kinda pushed my lock with my surgery on my arm and and I was in lots of pain...However, I got the first video done. It shows how to draw the part that you were asking for and I have psted as a DXF in my previous post. So here it is, I hope to have the rest done tonight (it wil be another one that is going to rough the inside of the key hole, one that is going to rough the part and leave the key hole as a island and another that is going to cut one of the tool paths.
Best regards,
Sorin

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