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My 4th Axis
« on: July 03, 2010, 12:27:17 PM »
Hi All,

AT LAST ! my need for rotary is fulfilled  :D

The table uses a 5Nm stepper onto a 2:1 pully driving the worm.
I 'just' need to sort out the CAM and start some serious chomping.
Initially I will use the 4th Axis as a progamable trunion indexer - plan is to use a length of 50mm square mild steel to jig up 5 parts per side which will save a whole load of tool changes on the parts I make.
I'll upload a video to the Tube in a while.
The long term aim is to set it up to do some 'proper 4 axis work' but for now just glad its all working !!!

Mach is great !

Derek


« Last Edit: July 03, 2010, 12:30:26 PM by derekbpcnc »
You can "chop it off" but can't "chop it on"
Re: My 4th Axis
« Reply #1 on: July 03, 2010, 01:10:47 PM »
a short vieo, indexing air :D

http://yfrog.com/0xmvi7112z
« Last Edit: July 03, 2010, 01:12:56 PM by derekbpcnc »
You can "chop it off" but can't "chop it on"

Offline Hood

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Re: My 4th Axis
« Reply #2 on: July 03, 2010, 06:51:54 PM »
Looks good :)

What kind of backlash do these Vertex tables have?
Hood

Offline Greolt

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Re: My 4th Axis
« Reply #3 on: July 03, 2010, 08:14:15 PM »

I 'just' need to sort out the CAM and start some serious chomping.

That looks great Derek.

The best price wise, real 4th axis CAM that I have found is DeskProto.

They have just introduced special hobby pricing for their full version.  248 euro.  Worth looking at.  30 day trial version.

Then there is the poor man's option of Wrapping XYZ toolpaths. 

A lot can be  done with this method but it is not REAL 4th axis CAM.

CNCWrapper is an excellent utility for this.   http://www.cncwrapper.com/

Greg
Re: My 4th Axis
« Reply #4 on: July 04, 2010, 06:20:34 AM »
Hi Hood,

The worm is on an eccentric, and is easilly adjustable (its the bronze coloured ring to the left).
Worm also has a thrust race that is preloaded and the eccentric has a clamp collar to remove just about all the end float.

I  just tested the back-lash, with a DTI touching the jaw of the chuck (max radius) and indexing via mach, backlash of 0.035ยบ or if I try and wrench the table round by hand, there is about 0.04mm of play, but it's more the spongyness of the drive train than "real" backlash.

So that looks good sitting on the bench, wonder what it works out in the real work when cutting some metal !!! time to find out :-)

Greg, I like the look of DeskProto, when I have a moment I'll install the 30 day trial.
ATB
Derek

Looks good :)

What kind of backlash do these Vertex tables have?
Hood
You can "chop it off" but can't "chop it on"

Offline bowber

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Re: My 4th Axis
« Reply #5 on: July 04, 2010, 07:28:11 AM »
I have a similar setup but the stepper is direct onto the 90:1 spindle, worm is adjustable on an eccentric and it seems OK for machining however I'm not doing critical stuff with multiple tools, just odds and ends of model engines etc.

Steve

Offline Hood

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Re: My 4th Axis
« Reply #6 on: July 04, 2010, 07:39:36 AM »
Sounds like a nice setup Derek, 4th axis is on my plans, maybe one day ;D

Hood

Offline Tweakie.CNC

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Re: My 4th Axis
« Reply #7 on: July 04, 2010, 08:12:45 AM »
Nice piece of kit Derek.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.