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Author Topic: pocketing and profiling  (Read 2798 times)

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pocketing and profiling
« on: October 17, 2015, 09:27:12 PM »
I'm going to try inlay on my cheap 3020 mill, starting with a 1" circle, pocket no problem, profile is either to big or to small, I can get them the exact same size, but need a little clearance to fit properly, I know I can make adjustment by changing profile a little smaller, but when I import designs it wont be that easy.  I know I will have to mirror the image before I run the profile but I think they will end up the same exact size which I could hammer in and make fit but the inlay will be to fragile to do that without breaking. I use bob cad/cam.  any help would be really awesome!

Offline Tweakie.CNC

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Re: pocketing and profiling
« Reply #1 on: October 18, 2015, 02:52:21 AM »
It takes some trial and error to initially find the right settings but for inlay work I create one Gcode for the 'pocket' cut on the inside of the line and the Gcode for the 'inlay' flipped and cut on the outside of the line with the line width (being the kerf width) determined in the .dxf artwork. Difficult to explain but try it and I am sure it will make sense. This approach works equally well for laser as well as rotary cutting.

Tweakie.
KEEP SAFE !
Re: pocketing and profiling
« Reply #2 on: October 18, 2015, 06:52:36 AM »
Thanks Tweakie,

OK so if I make an adjustment to the cutter dia comp.   example using a .125 tool the cutter comp is adjusted to .0625, I could set the comp to say .0605 and the actual cut will be .02 smaller? if thats correct that makes sense, now how to reset comp?  it sets the comp automatic when I enter a tool, do I just set the tool size a little larger, not sure if I can just change the comp I will have to see today where that is set, I thought that was done when I posted to gcode? I can see the comp at the begining og the code, can I change it there?

cant wait to change the dots on the fret board to something Cool

also to fit a part into another, is there a basic dimension for the fit. say 2 thou less gets the fit perfect?
Re: pocketing and profiling
« Reply #3 on: October 18, 2015, 06:57:11 AM »
opps I mean .002

Offline ger21

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Re: pocketing and profiling
« Reply #4 on: October 18, 2015, 07:22:51 AM »
Asking on a BobCAD forum might get you more help.
Quote
also to fit a part into another, is there a basic dimension for the fit. say 2 thou less gets the fit perfect?

There are many factors that will affect the fit, such as cut direction, feedrate, tool deflection, and flex in the machine. It's really something that takes a lot of trial and error to find out the exact parameters that work best for what you're doing.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: pocketing and profiling
« Reply #5 on: October 18, 2015, 07:37:17 AM »
bobcad seems to want to get paid for any advice, I did not get any response

Offline ger21

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Re: pocketing and profiling
« Reply #6 on: October 18, 2015, 07:55:58 AM »
There's a very active bobcad community at cnc zone. Try asking there.

I have no idea why people continue to buy BobCAD, when all they get is bad press year after year.


Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: pocketing and profiling
« Reply #7 on: October 18, 2015, 08:35:22 AM »
didn't know any better!!!! don't like how they keep changing versions an expecting you to buy every new version! hard to open the wallet for a new program, any suggestions on something better?  I could see if I was in business doing this stuff, but it's just a hobby.

Offline ger21

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Re: pocketing and profiling
« Reply #8 on: October 18, 2015, 08:44:43 AM »
Quote
didn't know any better!!!! don't like how they keep changing versions an expecting you to buy every new version!

Even worse, you apparently don't get any bug fixes unless you pay for a support contract. And new BobCAD releases are known to be very buggy.

As for alternatives, look at Vectric's products.
Or, sign up for a free copy of Fusion 360.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: pocketing and profiling
« Reply #9 on: October 18, 2015, 08:59:02 AM »
If you have BobCAD V25 with either of the last two builds it's really solid and capable with very few bugs, none that affect 2D, 2.5D, V-Carve, 3D with 3 & 4 axes, boy was I lucky ;-)
V28 might be very good if they fix a few annoying bugs and don't introduce any significant new ones,

 - Nick