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  #61  
Old Wed 28 January 2009, 21:48
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
The I-Beam is stiff for bending, but it is quite flexible for twisting. If the router had to go on the face furthest from the V-cap rails, the cutter would be quite far offset from the rails. Looking down on the table from the top, cutting force in the y-direction would cause the I-Beam to twist clock/anti-clockwise. Unless you can get the cutter placed between the v-rails (still looking from top), the torsion becomes an issue. Generally, a box-section (hollow profile) is the most desirable for long overhung z-axes.
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  #62  
Old Thu 29 January 2009, 08:11
jhiggins7
Just call me: John #26
 
Hebron, Ohio
United States of America
Quote:
Originally Posted by Gerald D View Post
...Generally, a box-section (hollow profile) is the most desirable for long overhung z-axes.
I see your point. So are you thinking of something more like the extruded box-beam this fellow uses?

Regards,
John
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  #63  
Old Thu 29 January 2009, 08:50
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Actually,
When fabrication is complete, it will look very similar to Geralds post #33 in this thread.
The web and outside flange will be removed to allow for the router/spindle to be in the same position as the original z-slide. Thus, to reduce the twisting both of you are very keen to notice. Instead of manufacturing a long back bone, I just happened to have an I-beam the right dimensions.
Sean
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  #64  
Old Thu 29 January 2009, 12:14
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Sean, I knew you had thought that one through already. My last post was for the wider audience who might have been tempted to go and buy some I-beam. Yup, first use what you already got!
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  #65  
Old Fri 30 January 2009, 13:45
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Todays fun!
zslide-on spider.jpg
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  #66  
Old Fri 30 January 2009, 15:09
sailfl
Just call me: Nils #12
 
Winter Park, FL
United States of America
Today I was able to see the modifications that Sean is making to his machine and I am eager to see the new Z and Indexer in action.
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  #67  
Old Fri 30 January 2009, 20:07
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
The plot thickens!

Notice that the traditional wrong_way_bending of the the 2 small tabs in the spider have reared their head again, but you are surely not using both of them.
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  #68  
Old Sat 31 January 2009, 05:20
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
...yep. Noticed it. Not using either of them so I really didn't care. Keen eye Gerald!
Did you notice the extended "leg" on the diagonal. I had the laser cutter leave an arm on each side so the back gauge on the brake press would ensure a parallel bend without trying to "visual sight" the bend.
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  #69  
Old Sat 31 January 2009, 05:28
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Smart thinking on the gauge tabs for the back-stop - I thought they were for the red braces in post #41. What have you got under your V-rollers? Look a little small, the roller may "wobble" a bit (cantilever overhung from the spider).
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  #70  
Old Sat 31 January 2009, 08:44
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Machine drill index pin collars the same diameter as the bearing race. Temporary.
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  #71  
Old Sat 07 March 2009, 06:40
glintid
Just call me: David
 
Back in Toronto
Canada
Vibration.

Hi Sean,

Do you anticipate any vibration on the extended Z arm passed on by the router? I know that aluminum has a tendency to vibration. I'm looking to build a similar machine with an extended Z and your solution seems to be the simplest.
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  #72  
Old Sun 08 March 2009, 11:55
Art
Just call me: Art #2
 
Lancaster,Texas
United States of America
My try

Because of the laterial and vertical force involved the rack and pinion on the Z gets lost. I replaced it with a lead screw I have 10" of travel with the Z plate between all V rollers and up to 15" if I go past the top ones. Will have it installed and running next week.
Attached Images
File Type: jpg zaxis.jpg (95.1 KB, 1032 views)
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  #73  
Old Fri 13 March 2009, 15:35
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
bbq ready to start cutting

Today's installation.
Z-slide, balancer, and cable work well. Next stop....4th axis cutting!

z-done2.jpg

z-done1.jpg
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  #74  
Old Fri 13 March 2009, 15:56
Art
Just call me: Art #2
 
Lancaster,Texas
United States of America
Serious Z

Nowthat is a real serious extended Z! You gota show the whole machine in one picture amd working.
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  #75  
Old Fri 13 March 2009, 17:21
YRD
Just call me: Yuri #17
 
Brasilia - DF
Brazil
Uau
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  #76  
Old Fri 13 March 2009, 18:41
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
Sean,
I noticed in one of your pictures that the lowest set of rollers is now missing?
Is this a mod? Just curious, or perhaps the picture is of a non complete unit?
Looks awesome though!
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  #77  
Old Fri 13 March 2009, 19:11
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Heath,
I had a problem with the hole on the that side of the slide.
I needed to get cutting, so I left 1 bearing off. The threads were tapped slightly not square and was causing the bearing to not seat properly, so I left it off.
Thanks for noticing!
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  #78  
Old Fri 13 March 2009, 23:11
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Good work Sean!

I still think it would be good to bridge the gap. You could even go as far as the second router bracket . . .

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  #79  
Old Sat 14 March 2009, 05:32
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
...Planned, just not installed yet!
That's todays metal working challenge. For the life of me I couldn't wrap my head around that electrical cord exit, so I just said I will cut something to fit in the field.
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  #80  
Old Sat 14 March 2009, 06:48
J.R. Hatcher
Just call me: J.R. #4
 
Wilmington, North Carolina
United States of America
Send a message via Skype™ to J.R. Hatcher
Can't you rotate the router 90 degrees so the cord will be on the right side???
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  #81  
Old Sat 14 March 2009, 07:04
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Suspect it has to do with the speed control?:

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  #82  
Old Sat 14 March 2009, 07:44
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Gerald and JR.
You are both correct.
I have 2 router heads. One is the 7518 model which is single speed (for foam) and the 7519 model which I use for wood, metal, etc. So, you both are correct. I will try both heads today and see if I can't make it work. i'll be honest and say I didn't spend to much time on it yet.

Last edited by smreish; Sat 14 March 2009 at 07:51..
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  #83  
Old Sat 14 March 2009, 18:23
Art
Just call me: Art #2
 
Lancaster,Texas
United States of America
Z installed

I got the Z installed and rinnind and it looks great. With the Z all the way down ithe plate is still between all V rolers.
Attached Images
File Type: jpg zinstalled.jpg (84.2 KB, 951 views)

Last edited by Art; Sat 14 March 2009 at 18:27..
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  #84  
Old Sun 15 March 2009, 19:17
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Nicely done Art.
Today I was able to rotate the router 180 degree's and have the cord exit the rear next to the slide. Final stiffener bracket is in the works.
I have to add "one more rotation" on the cable balancer tension spring and I think my slide will be dialed in for vertical travel.
I have a small challenge with my indexer at the moment, but I will address that later this week.
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  #85  
Old Thu 06 August 2009, 05:10
sprayhead
Just call me: Francis
 
sydney
Australia
Quote:
Originally Posted by Art View Post
I got the Z installed and rinnind and it looks great. With the Z all the way down ithe plate is still between all V rolers.
Hi Art

My project has a similar setup as yours, with a lighter (shorter) gantry and I am at the moment a bit worried about my gantry not being heavy enough and lifting out of the tracks.

Have you made any attempts on testing how much force you need to put on the router bit with the Z fully extended (down) until the whole gantry starts to flip (wheels start to lift)?


Ultimatelly I would like to be able to calculate the exact force needed to start lifting wheels out of the tracks, but at this moment it's probably still out of my knowledge base.

thanks,
Francis
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  #86  
Old Tue 18 August 2009, 07:16
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Extended Z-slide summary

To All,
I have received a few emails lately on the performance and details on the slide extension I have modified for foam cutting.

In summary:

What is the Z-slide made of?
- W6" x 4.7#/ft Aluminum I - Beam
- custom z-spider
- BWC Vee Rail
- 8 - BWC #3 Rollers
- 1 35# constant force spring/cable balancer
- porter cable 3.5HP router
- 3dcutting.com 12" x 14mm round nose bit


Usable cutting distance
0 to -36" Z
0 to -12" Z you can cut all normal MM materials (ply, plastics, etc)
-12 to -36" you can cut foam upto about 22# density...I haven't tried more dense materials

In use for about 8 months with no issues.

Pictures for review:
z-long stroke-1.jpg

z-long stroke-2.jpg

z-long stroke.jpg

zslide-on spider.jpg
DO NOT PAY attention to the small little bushings behind the VEE wheels, this was a temporary set up for alignment use only. Use the MM specified bushings

z-spider.jpg
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  #87  
Old Tue 18 August 2009, 08:12
Doug_Ford
Just call me: Doug #3
 
Conway (Arkansas)
United States of America
Cool Sean. I'm amazed at the innovation on this forum.
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