Author Topic: 5 axis cnc  (Read 23207 times)

gocnc

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5 axis cnc
« on: September 30, 2009, 01:37:27 PM »

Is it realistic to think about 5 axis milling for people like us.
When I say like us I mean those people that arent engineers or programer


travis77

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Re: 5 axis cnc
« Reply #1 on: September 30, 2009, 02:21:35 PM »
Not really. Unless you want to drop some $$, you arent going to get the results with a budget DIY machine. Not to mention, there's not much help/info around for 5 axis software or hardware for the average garage builder. DIY people do venture into 4 axis stuff, which is do-able. I have no idea what CAM software they use though.

What are you trying to make with a 5 axis machine anyway?


Gabriel

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Re: 5 axis cnc
« Reply #2 on: September 30, 2009, 03:09:53 PM »
Right, the CAM software alone would probably be pretty expensive. I think MeshCam will do 4-axis stuff. I believe it's around $150, which isn't too terrible.

I haven't looked into it too much myself, but one program which I know does 5-axis is MasterCam. It comes in different versions, but the one I was looking at was well over $10,000.

You can still do a lot with a 3-axis machine though. You just have to be clever about it. Although, keep in mind that complex 3D parts take many many hours to cut out. That's tough work for a DIY CNC machine. It depends on the size of the part though. If it is a reasonable size, you should be fine, but, if you want to do something that is large, it's going to take awhile.

The material you're cutting also makes a difference. If you are cutting foam, then you won't need much in the way of roughing passes. This greatly decreases the amount of time it takes to cut out the part.

So, I guess that there are many variables to look into.

gocnc

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Re: 5 axis cnc
« Reply #3 on: September 30, 2009, 04:44:55 PM »
I went on youtube for 4axis cnc milling
I liked what I saw for now I have given up trying to do something with 5 axis
but how about 4 axis
 I will spend some time on this site MeshCam
Can anyone give me more info on 4 axis
Thanks

travis77

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Re: 5 axis cnc
« Reply #4 on: September 30, 2009, 05:46:25 PM »
Ill try to find some more 4 axis info that I have seen before.

But I do remember seeing this free multi-axis CAM software: http://www.cnc-toolkit.com/ and a linked site from there you may find interesting: http://www.doughtydrive.com/index.html

More info on this software read under the essentials tab: http://cnc4free.org/    In order to use CNC Toolkit, you need to be using GMax which is explained on the website.

Also search "4 axis" over on http://www.CNCzone.com, there's lots of info there.


gocnc

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Re: 5 axis cnc
« Reply #5 on: September 30, 2009, 06:22:45 PM »
Hi Travis
Thanks for those links and also for the links you posted yesterdays about buying the nuts and the bolts of a simple 3 axis cnc mill
I will am comparing prices and products and when I have any results I will share it with you guys.

Back to the 4 axis milling  I did some googling and I am still not clear as to exact concept
I must admit I didnt do enough research and I am short of time.
The main question that i have is that how does the Cad file get convert by the CAM program.
Is there programing involved and also what is the 4th axis called I figured maybe something like w
I would like to read a simple tutorial on the subject of 4 axis cnc milling
I spend a lot of time in this web site I like going there now and then

In google I entered these words but did not come up with any good links
TUTORIAL ON 4 AXIS CNC MILLING

pie_row

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Re: 5 axis cnc
« Reply #6 on: September 30, 2009, 08:01:02 PM »
http://www.machsupport.com/

I think that 5 axis has a bad rap.  The commercially built ones were built for high end users that had big bucks.  If the software is really as cheap as it looks then it should be not that hard to do.  I'd like to CNC port cylinder heads.  That takes a 5 axis mill.  The hobby stuff on those links,  Mach3 if it really works someone needs to start making and selling a 5 axis Sherline mill. http://www.sherline.com/


OK I'm Off of my soap box.

Edit= added
5-Axis CNC Mill @ Hogeschool Antwerpen
« Last Edit: September 30, 2009, 08:22:41 PM by pie_row »

pie_row

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Re: 5 axis cnc
« Reply #7 on: September 30, 2009, 08:41:16 PM »
A bit more thinking,

Someone needs to make a really cheap but functional 5 axis mill.  A hunk of junk.  Definitely VHS not Beta.  That would brake the 5 axis stereotype.

travis77

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Re: 5 axis cnc
« Reply #8 on: September 30, 2009, 10:44:20 PM »
Gocnc, the 4th axis is called the "A" axis. Im working on trying to dig up some homemade 4th axis stuff on google. It was harder than I imagined.

Someone needs to make a really cheap but functional 5 axis mill.

If there was a cheap and easy way to do 5-axis stuff, then everyone wouldn't be messing around with basic 3 axis stuff. Not to mention most controller boards are for 3 motors, some 4. So going to 5 axis would require a 5 motor board. Which Id assume would cost more since they aren't easily available in the DIY crowd. You could make your own cheap version probably.

Sherline mills and lathes are cool. More than I'd want to spend on one. If I was going to seriously buy a lathe or mill, I'd go full scale and buy used. You'd eventually want to make a bigger part, and your mini lathe and mill that you just spent a decent amount of cash on would restrict you.

CNC porting would be difficult I would imagine. That means you would have to 3D model the port in CAD software in order to turn it into code to be ran on the 5 axis. Also you'd have to take into consideration the limitations of the 5 axis. You could easily design a port in CAD that the machine physically couldn't mill out. Then also take into consideration that milling hard metals is nothing a MDF 5 axis garage CNC would ever be able to do.. There's a reason these giant precision machines that companies use cost so much.

gocnc

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Re: 5 axis cnc
« Reply #9 on: October 01, 2009, 07:31:28 AM »
Hi Folks
Thanks for your help
Here is someone selling a 4 axis cnc mill and the price is about 5,000 dollars.
http://www.microkinetics.com/4axis.htm

It uses this cam program
http://www.microkinetics.com/mmpfw/

I guess you make your design with your CAD program and this CAM program will give you the G code and I am not sure about this but there is an M code also for the A axis


pie_row

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Re: 5 axis cnc
« Reply #10 on: October 01, 2009, 11:20:22 AM »
Travis,

I know someone that is fully capable of designing a 5 axis controller.

Have you heard of lost foam casting? http://buildyouridea.com/cnc/IG-88/phase_four/phase_four.html This is a really easy way to make cast Aluminum parts.  Cats iron is a bit harder.  Concrete filled square mild steel tubes with welded construction.  Heavy solid stiff.  Home brew linear bearings. http://www.buildyouridea.com/foundry/lost_foam_howto/lost_foam_howto.html  http://www.buildyouridea.com/cnc/hblb/hblb.html These two pages show how to make one person's idea of a cheap HBLB.  For the ways I'm looking at cold rolled mild steel key stock.  One inch square.  For the rollers, cam followers.  They are cheap at junk yards.  Roller cam followers.

The question is why isn't everyone doing 5 axis stuff?

The programing.  Mach3 plus what else do you need to support it?

Converting a big mill ya that's a good way to go.

You should be able to build a CNC milling machine with a CNC router.

pie_row

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Re: 5 axis cnc
« Reply #11 on: October 01, 2009, 06:10:31 PM »
http://www.5bears.com/cnc01.htm

This link chronicles the build of a DYI CNC bench mill.

With this kind of construction, but with less expensive components, it should be possible to make a really good quality CNC for cheap.  And it should be up too doing cast iron.

For cylinder head work.  The head is held at the ends and allowed to be rotated around its long axis.  There is a slide that allows the port that is being worked on to be at the center of rotation for another axis.  Then there is an XYZ arrangement a 6 axis mill. 

How you do the ports is first by hand then you scan it in then you work out the tool paths. PITN

travis77

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Re: 5 axis cnc
« Reply #12 on: October 01, 2009, 11:26:27 PM »
Yep I've heard of lost foam casting, and have seen that guy's website "Build your Idea" very cool stuff over there.

The link to that bench mill build is very amazing. He build it using his lathe and mill though... Which i dont have. But the tolerances on that machine build are awesome. He spent a lot of time building and designing that one. He actually did use pretty standard DIY components for linear rails and guides as well as leadscrews, nuts, and aluminum t-slot. If you are wanting to build a solid, small, accurate machine, you really cannot go any cheaper than what components he used.

If you like the one you linked me to, check out this one. Its in another language so i used google to translate it. http://translate.google.com/translate?js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.devilmaster.org%2Fsections.php%3Fop%3Dviewarticle%26artid%3D40%26page%3D9&sl=es&tl=en&history_state0=

gocnc

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Re: 5 axis cnc
« Reply #13 on: October 02, 2009, 06:39:13 AM »
Hi Travis
Thanks for that link
I like the way he explains things step by step.

gocnc

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Re: 5 axis cnc
« Reply #14 on: October 02, 2009, 07:47:36 AM »
The parts like the extruded aluminum can be purchased at local door and window makers
How much of all those parts can be found ready to use
I am talking about the project on the devil master site