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Hey,
Just found this video of a 4th axis in action, i liked the design he was cutting and also think its a good example of what you could do if you went for a 4th axis !
http://www.youtube.com/watch?v=O-RzYjSPzP4
Is anyone looking to add a 4th axis or ?
Lee
Is that a 4th axis or merely a rotary X or Y?
?????? Sorry can you explain the difference ?Quote:
Originally Posted by BillTodd
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I was expecting to see 4 axes in motion.Quote:
Originally Posted by John S
Here's one I did earlier :dance:
http://www.youtube.com/watch?v=fps0OR1eF_s
Ignore the dancing about, the X3 was on a transport stand ready to go to the 2006 Harrorgate show and the castors were not locked down.
This is another gear but instead of being done on a rotary table or 4th axis this one is just done in X, Y and Z fixed in a chuck bolted to the table.
http://www.youtube.com/watch?v=RV8Dq6mslnE
The model came out of a CAD parts file off the web as an STL file, programmed in Vectric's Cut3D and cut with a 2mm ball nose cutter.
The video shows the final clean up pass in the opposite direction to remove some of the cutter marks.
It could have been a lot better if I had reduced to stepover but as I'd not done one before I didn't want to waste a lot of cutting time if it didn't work.
Never got round to doing a finer pass gear and some bastard nicked that one anyway [ probably Kip :whistling: ]
Spiral helicals are one of the hardest type of gear to cut and a one off can take well over a day to cut in a home shop.
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When there's only 3 axes moving! (else I'll claim by engraver is a 9 axis machine - 'cos I've yet to build the other 6! )Quote:
Originally Posted by Kip
[edit] Just remembered it has a unused 4th axis already so only 5 to build ;)
Out of interest, is there a general thread for CNC videos?
No not as such, we do have a Video Gallery but it hasnt been used that much. I add video's as i find them, your more then welcome.Quote:
Originally Posted by tribbles
On the subject of axis'sss whats the diference between 2.5d and 3d ?
Rough difference.
2.5 D is where the Z axis drops to a predetermined depth and the shape is produced in X and Y whilst at this depth. X and Y can work together like doing a circle and it's called interpolation.
Typical example is doing a pocket down to 10mm deep in stages of 2mm at a time.
3D is where the Z axis is changing all the time as the X and Y are moving, imagine machining the aerofoil section on a plane wing.
Virtually all machines with a powered Z can do 2.5D and 3D, the difference is in the CAM software to generate the code.
2.5D is relatively cheap but full 3D starts to get very expensive.
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So the router tables being built here and run with mach3 are all 2.5d ?
No they can be either.
It all depends on the code they are fed.
Mach is capable of 3D linear moves.
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So the trick is generating the code. .. ands that's what cadcam does?
I have some g code experience as i have an old Ikegai lathe with a fanuc 6t control on. Also used a mini mill but only as a production machine. Never got the chance to play with it and its now gone.
Would like to build a plasma / router combo 4' x 4' . Have been watching Tribbles link with great interest. Would that convert to plasma ?
I have a decent work shop with a bridgeport vertical mill ( manual) TIG and MIG so have got the gear. Pretty good with PC's but limited electrical experience. Also know my way around solid works.
I guess i'm just trying to convince myself to "have a go"!
Al
You have more than enough to get started! And we are all here to help!Quote:
Originally Posted by adscnc
You can't have a decent workshop if you have a Bridgeport :whistling:
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