Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Buggalugs on June 07, 2012, 04:50:33 PM

Title: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 07, 2012, 04:50:33 PM
 I am about to start my first serious milling task so please bear with me on this. I have taken my drawing from AutoCAD it is a new spindle mount which will take a smaller motor. The 200W spindle motor is a bit of an overkill with the size of tools and work that I will be doing. The mount I am wanting to make is a 34mm Split Collar type Clamp with a  a couple of Allen Bolts to close the clamp.

I imported the drawing into LazyCAM which created my G Code (So far so Good! ). To prove my code I put my trusty pencil lead into the chuck and set it away. Perfect.... or so I thought, but then things went pear shaped and ground to a halt  I will be using a 5mm End Mill to machine the job, which effectively means all my dimensions will be + - 2.5mm  I have started to look into the Tool Offsets but after 40 minutes or so I'm more confused than I was when I first started....

Am I on the right track here? Does Mach3 take care of the the offsets for you or do you have to force some calculations yourself?

Could some kind person put me in the right direction please...
Title: Re: Newbie Help Please with Tool Offsets
Post by: Hood on June 07, 2012, 04:54:41 PM
Usually your CAM will do the offsets for you. I dont use LazyCAM but I would imagine it too offsets if you tell it the tool dia you will be using.
Hood
Title: Re: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 07, 2012, 05:03:08 PM
oh, thanks for that, Ill look into that. Real pity there is no help files for LazyCam it seems to do as it says on the box. Is there any other CAM software about that you can recommend which will do the same? preferably on free/shareware.  I have just spent another 110 quid on an MPG  from the little yellow people - if I spend another penny I will be needing the help of a good divorce lawyer!
 
Title: Re: Newbie Help Please with Tool Offsets
Post by: HimyKabibble on June 07, 2012, 05:47:10 PM
I believe only LazyCAM Pro does offsets.  For the free version, you need to draw the toolpaths appropriately offset for the tool you will use.  All the common "hobby" CAMs (SheetCAM, CamBam, etc.) will to proper offsetting.  LazyCAM is *really* bad.  And don't even get me started on LazyTurn....

Regards,
Ray L.
Title: Re: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 07, 2012, 05:51:52 PM
I have found FreeMill......

Any good?????
Title: Re: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 08, 2012, 05:26:13 PM
Well looks like I have answered my own query... FreeMill ? it's FREE to use until you come to save your project. 'Cannot save in DEMO Mode' this really chips me off you know. Why the Hell do they say it's FREE when after nearly a day of poking and pressing you find, 'Well, it's not really FREE it is FREE to find out how it works.....

Real pity they have abolished hanging, these people are prime candidates    >:(
Title: Re: Newbie Help Please with Tool Offsets
Post by: RICH on June 09, 2012, 08:07:46 AM
Quote
Why the Hell do they say it's FREE

Most software allows the user to try t out and see if it's right for them. There are usualy some kind of restrictions though and one should read the info to see what they are. Cost's time and money to develop software. Nothing these days seems to be free other than the individual
donated time of outstanding folks helping others on this site...... ;D

For LazyCam there is a manual and has all the info you need on using it for milling. Just draw your desired profile in CAD, offset the profile to suite your cutter diameter in CAD, export as a version 12 dxf, import to LC, clean the file, select the profile, define the depth of cut,
post code to Mach or save as a file, don't do things like trying to cut a arc with a cutter bigger than the arc, ect, .....read the manual,
have fun. ;)

There are numerous CAM programs out there, each is different and costs vary, once you pick what you want you pay the price.

RICH
Title: Re: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 09, 2012, 08:24:28 AM
Hi Rich and thank you for your reply. Point taken about the software,  but why promote something as being FREE when it isn't... that is just short of deception and should be outlawed globally. Anyway, that is my 'Rant' out of the way for today.

I may have done FreeMill a bit of an injustice in my previous post as it DOES allow you to save certain parts of your work. On the other hand it is way too complex for my inexperienced brain to take in at this stage.
Title: Re: Newbie Help Please with Tool Offsets
Post by: RICH on June 10, 2012, 08:37:41 AM
Quote
On the other hand it is way too complex for my inexperienced brain to take in at this stage.
You just need to spend the time learning and there are no shortcuts.
CNC Programming Handbook by Smid covers all the basics to complex and is a book worth adding to ones library.

There's plenty of stuff on the internet you can read also.

Have a look at Tutorial #1 in the LC Manual. How you do the equivilant in another program may be different but the general jest of the
tutorial is worth readng.
RICH
Title: Re: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 10, 2012, 08:53:52 AM
Thanks for that Rich, I am going to try to stick with this FreeMill stuff for the time being, it is right what you say about it taking time to get to grips with, it is a very steep learning curve. I have heaps of Milling, Drilling, Engraving and making projects waiting to be exploited on this 'expensive toy' as it has been named by my wife.

No kiddin, I have wanted one of these machines for eon's, I tried making one about twenty years ago - I spent 5 weeks and only got as far as the gantry !

However the other half has commented that my 1Recreation Chemistry Hobby has been ignored of late! 



1Recreational Chemistry: Coverting Ales Wines and Whisky into urine.....
Title: Re: Newbie Help Please with Tool Offsets
Post by: Graham Waterworth on June 10, 2012, 11:21:57 AM
Have a look at CAMBAM its free and it works or you can pay a small amount and have the latest and greatest version.

http://www.cambam.info/

Graham
Title: Re: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 10, 2012, 11:29:27 AM
Wow... Thanks for that Graham. I have just had a quick peep at one of the tutorial videos. It looks quite good and relatively easy to get to grips with.

Thanks once again, I'll get back to and let you know how I get on.  :) :)
Title: Re: Newbie Help Please with Tool Offsets
Post by: RICH on June 10, 2012, 12:03:34 PM
Yep, all you need to do is supply the dxf, select what you want to machine and how, define a few parameters and post the code to a file
for MACH. I use it and think it's good program for the money but someone else may have a different take on Cambam.
It also has some advanced features that you can explore later on.
RICH
Title: Re: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 10, 2012, 12:13:59 PM
Hopefully this is what I need. Really looking forward to getting stuck in to it!

Does this resolve the kerf (Hope that is right word for tool offsets!) issues ? Thanks again to all.
Title: Re: Newbie Help Please with Tool Offsets
Post by: RICH on June 10, 2012, 05:01:05 PM
The program will provide code which accounts for the diameter of the cutting tool .
RICH
Title: Re: Newbie Help Please with Tool Offsets
Post by: nzinoz on June 11, 2012, 05:33:17 AM
Hopefully this is what I need. Really looking forward to getting stuck in to it!

Does this resolve the kerf (Hope that is right word for tool offsets!) issues ? Thanks again to all.
Hi Buggalugs I to am new to cnc and have found CamBam very helpful, it does all the basics like inside or outside profile cuts , pockets, several drilling cycles , and engraving, the full version is free for 30 uses. If you enter a tool Dia and generate paths you get an accurate preview you can the change tool dia and regenerate to see new path. I have only scratched the surface of the programme. Check out their forum
Title: Re: Newbie Help Please with Tool Offsets
Post by: Buggalugs on June 11, 2012, 05:47:38 AM
Hi Nick and thank you for your reply. I downloaded and installed an instance last night. I have only had about five minutes 'play' with it and look’s like it is going to fit the bill very nicely....

It is not badly priced at 98 quid but as you rightly say you can have forty or so 'FREE' un-tethered goes with it before you part with your pennies.. (Don't get me started on the 'FREE' bit again  >:(  )
Title: Re: Newbie Help Please with Tool Offsets
Post by: nzinoz on June 11, 2012, 06:04:51 AM
Hi Nick and thank you for your reply. I downloaded and installed an instance last night. I have only had about five minutes 'play' with it and look’s like it is going to fit the bill very nicely....

It is not badly priced at 98 quid but as you rightly say you can have forty or so 'FREE' un-tethered goes with it before you part with your pennies.. (Don't get me started on the 'FREE' bit again  >:(  )

Hi your up early :) I suggest you have a good long look at the HELP file accessed in the top right menu It will make your head spin but to my mind very good  ;D