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  #1  
Old Mon 04 August 2008, 06:52
bradyaero
Just call me: Greg #19
 
Smiths Falls, Ontario
Canada
An approach to extending Z-Axis.

Hi Gerald,

Can you critique the following approach to extending the z-axis. (My application is 90% foam cutting).

Is it possible to add height to the parts 1020451PA and 1020456PA in such a way that torsional stiffness is not comprimized? Is there another way that makes more sense?

Thanks, Greg

btw the parts from domino11 are works of art! Thanks Heath.
Attached Images
File Type: jpg zheight.jpg (41.6 KB, 1852 views)
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  #2  
Old Mon 04 August 2008, 09:42
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
I wouldn't do it.
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  #3  
Old Mon 04 August 2008, 11:17
Robert M
Just call me: Robert
 
Lac-Brome, Qc
Canada
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Greg, Why would you want risking rising the gantry assy & felx when you could just conceive a lower table ( Lowering the X-bearers ) ??
Playing with flex, I would say !!
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  #4  
Old Mon 04 August 2008, 11:24
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Greg,
I actually have a bolt together table so I can remove the center of the table and cut up to 48" below the Gantry as designed. I am currently remaking my Z-slide with a few Gerald suggested changes to accommodate a 36" stroke z-slide.
I have taken a few pages from the SB forum by raising the machine slightly off the floor to allow for a complete 48 x 48 x 96" billet of EPS foam for mold making.
I trust this is a similar approach you are considering.
Let me know...maybe we can compare notes.

Sean
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  #5  
Old Mon 04 August 2008, 18:05
bradyaero
Just call me: Greg #19
 
Smiths Falls, Ontario
Canada
Ahhh nice,

So if I keep the upper structure as designed, and put my energy into lowering the table center I can achieve my goal?

Thanks for the Info Sean.
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  #6  
Old Mon 04 August 2008, 18:07
bradyaero
Just call me: Greg #19
 
Smiths Falls, Ontario
Canada
here we go.. I think it'll work great!

Last edited by bradyaero; Mon 04 August 2008 at 18:11..
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  #7  
Old Mon 04 August 2008, 18:10
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
Greg,
No problem , glad you like the parts.

Sean, Greg,
Hopefully you will compare notes in a build or mod log so the rest of us can chime in?
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  #8  
Old Tue 05 August 2008, 06:31
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Chiming in will be no problem.
I have already sent the new, longer and larger spider to laser cutting.
I hope to have it back in a week or two. It's on the LOW priority list at the cutters. They said they would put in the works when the table had a large enough drop to accommodate it. Nils was kind enough to order the eccentric bushings and additional bearings for me with his order, thus I have most everything I need on hand now.

Sean
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  #9  
Old Tue 05 August 2008, 06:44
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
This sounds really interesting.
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  #10  
Old Tue 05 August 2008, 07:09
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
I sent Sean a "doodle" I found on PC. Can't remember when or why I did it. To use entirely at own risk . . .

Change the attached extension to .dxf when you save it, open with CAD. Wonder if the holes still line up?
Attached Files
File Type: txt TallSlide.txt (36.7 KB, 231 views)
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  #11  
Old Tue 05 August 2008, 08:41
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
I did change a few holes, added a few to match the Mamba carriage and extended the open area for the gearmotor stepper clearance.
pm me if you want the cadfile i can't get the revised version under my kb limit sean
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  #12  
Old Tue 05 August 2008, 10:27
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Okay Sean, you finish the development on that, and then we will place your drawing in the set.
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  #13  
Old Tue 05 August 2008, 18:38
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
...I LOVE being the guinea pig
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  #14  
Old Tue 05 August 2008, 18:45
bradyaero
Just call me: Greg #19
 
Smiths Falls, Ontario
Canada
Wow, now that's nice! Is there a bending schedule or does it pretty much follow the smaller spider plate?
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  #15  
Old Tue 05 August 2008, 19:43
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
The bending schedule is identical to the regular spider plate.
Nothing on that front to change. I have attached the plate with modifications as a general reference of the idea.
Sean
tallslide_reference.jpg
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  #16  
Old Wed 06 August 2008, 02:51
sailfl
Just call me: Nils #12
 
Winter Park, FL
United States of America
Sean,

That is one strange looking plate but I am looking forward to seeing you use it.
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  #17  
Old Wed 06 August 2008, 03:32
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Maybe we can call it the "pirate" plate - a skull with an eye-patch?
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  #18  
Old Wed 06 August 2008, 07:01
Marc Shlaes
Just call me: Marc
 
Cleveland, OH
United States of America
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yeah, I can't say I understand what I am looking at.
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  #19  
Old Wed 06 August 2008, 07:15
Greg J
Just call me: Greg #13
 
Hagerman, New Mexico
United States of America
I'm in Marc's camp.

Shouldn't the holes for the V-rollers line up with the long axis (up/down in the drawing).
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  #20  
Old Wed 06 August 2008, 07:29
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
It is a way of getting 2 more z-rollers above the z-motor. Bottom half is the standard spider.
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  #21  
Old Wed 06 August 2008, 07:36
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Does this give the hint?:

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  #22  
Old Wed 06 August 2008, 08:04
Marc Shlaes
Just call me: Marc
 
Cleveland, OH
United States of America
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Oh, the z motor "peeks" through the big hole????
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  #23  
Old Wed 06 August 2008, 08:20
Alan_c
Just call me: Alan (#11)
 
Cape Town (Western Cape)
South Africa
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This might help clear things up, based on Geralds original drawing.

tall spider.jpg
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  #24  
Old Wed 06 August 2008, 08:48
Alan_c
Just call me: Alan (#11)
 
Cape Town (Western Cape)
South Africa
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You can see why Sean had to make some changes, the motor bracket would foul the spider and the holes dont line up with the car, thats why its called a doodle

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  #25  
Old Wed 06 August 2008, 09:01
Greg J
Just call me: Greg #13
 
Hagerman, New Mexico
United States of America
Thanks Alan and Gerald,

Nice models.
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  #26  
Old Wed 06 August 2008, 09:44
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Thanks Alan!
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  #27  
Old Wed 06 August 2008, 10:36
Marc Shlaes
Just call me: Marc
 
Cleveland, OH
United States of America
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I'm impressed.
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  #28  
Old Wed 06 August 2008, 10:41
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
Impressive,
Maybe we could call it the super spider.
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  #29  
Old Wed 06 August 2008, 10:58
Marc Shlaes
Just call me: Marc
 
Cleveland, OH
United States of America
Send a message via Skype™ to Marc Shlaes
Tarantula
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  #30  
Old Wed 06 August 2008, 13:42
Leko
Just call me: Leko
 
Kaukapakapa
New Zealand
Looks great! Now how long a z-slide can you have before it needs reinforced?

And once you get a 36" z-slide are we going to put on a little baby cable chain for the router's cord?

I suppose a 4:1 reduction on the gas spring will be needed as well so that it doesn't need to be 24" long...

wait..wait..wait...you know what we really need? Neon!
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