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  #1  
Old Fri 04 December 2009, 12:10
lumberjack_jeff
Just call me: Jeff #31
 
Montesano, WA
United States of America
Anyone familiar with Nexen roller pinions?

At first glance, the technology seems brilliant for our application.

http://www.nexengroup.com/nexen/prod...87&mainpn=true

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  #2  
Old Fri 04 December 2009, 12:43
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Search this forum for nexen to see a lot has been said about it.
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  #3  
Old Sat 23 August 2014, 08:24
ger21
Just call me: Ger
 
Detroit, MI
United States of America
The previous post is probably a spammer who brought this thread back from the dead, but I have something to add.

I'm building my own design 4x8 router. I happened top stumble across a pair of used Nexen roller pinions on Ebay, and bought them $180 each.
I spent a few hours creating an AutoCAD macro that would draw the tooth profile for the rack, and cutout a sample rack from baltic birtch.
The idea was to machine the rack from 3/4" phenolic plate on our Morbidelli router at work.
The sample looks like it should work fine, but I need to machine a sample from phenolic to see how precise I can get it.

My original plan was to use a custom made version of the Servo Belt drive system. http://bell-everman.com/servobelt-linear-drive

I'm still on the fence as to which method I'll use, until I make a sample rack for the roller pinions.
But I think this could be a viable option if the rack can be fabricated accurately and cheaply enough.

One issue I ran into was that these pinions are rather large, and need to use some type of gear reduction. After a few days of searching, I picked up a pair of 21:1 planetary gearboxes with 0 backlash from Ebay. These will be used with 400w brushless servos.
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File Type: jpg nexen 016_mm.jpg (96.9 KB, 159 views)

Last edited by ger21; Sat 23 August 2014 at 08:28..
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  #4  
Old Wed 27 August 2014, 16:07
Jason Marsha
Just call me: Jason
 
B'Town
Barbados
That is a big pinion. What is the bore size for the shaft?

Jason
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  #5  
Old Wed 27 August 2014, 16:37
ger21
Just call me: Ger
 
Detroit, MI
United States of America
I think it's 30mm. But I don't need to mount it to a shaft. I turned an adapter to mount it to the face of the gearbox.
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File Type: jpg X Drive 1mm.jpg (52.8 KB, 103 views)
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  #6  
Old Thu 28 August 2014, 03:22
Fox
Just call me: Fox
 
Amsterdam
Netherlands
However good or bad those Nexen rollers are, I still think that the rack and pinion system is by far the most affordable, easy to maintain, install, to get, etc for a Mechmate user, like Gerald intended with his K.I.S.S design approach.

If anything I would rather upgrade to helical rack and pinion then a Nexen system I think. Still nice to see the outcome of your endeavors though.
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  #7  
Old Thu 28 August 2014, 03:55
KenC
Just call me: Ken
 
Klang
Malaysia
IMHO, this is good when there is a space constrain.
If gearbox is needed, then that would defeat the space-saving advantage.
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