|sam sokolik||22/10/2020 15:59:05|
|67 forum posts|
Some more fun with cnc...
|Michael Gilligan||22/10/2020 22:39:22|
16639 forum posts
Clever stuff, Sam
Keep sharing your adventure
|282 forum posts|
A couple of questions:
Right now, it is effectively converting a closed shape into a series of (X, A) coordinate values, where I guess the A- increment can be arbitrarily small.
How easy would it be to make it turn 90 degrees and produce (Z, A) values? I am thinking of a face cam, as used in Brierley and Rush drill grinders.
Second, does it have any built-in idiot-proofing? If I sent it a circular hole with a keyway cut out, would it tell me to go away and pound sand due to the discontinuity in the profile? As a corollary to this, what is the most acute internal angle with which it is comfortable (e.g. an equilateral triangle-shaped bore)?
|Nigel Graham 2||23/10/2020 09:04:43|
|802 forum posts|
I'm not an expert on CNC machining but I don't think the keyhole would be a problem unless the corner radii are very critical . Rather, won't the minima on milling internal dimensions including angles, be controlled by practical machining criteria like the diameter and lengths of the cutters, more than the tool paths?
I recall seeing a drawing at work of something resembling the internal profile of a hollowed stepped pulley, in which one of the steps was shown with a small pocket, perhaps for a form of key, milled into it. The pocket's size and 2mm corner radii were so small, and it was so far down the overall cavity, I could not imagine how it could be machined with any standard slot-drills.
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.