New Z-Axis (Non Milled Acme rod with AntiBacklash Nut)

discussion of design changes / improvements / suggestions
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jzhvymetal
Posts: 21
Joined: Thu Nov 22, 2012 1:36 am

New Z-Axis (Non Milled Acme rod with AntiBacklash Nut)

Post by jzhvymetal » Sun Mar 02, 2014 3:59 am

Not happy with my current setup of the Z-Axis, I decided to design something that will work with current AntiBacklash Nuts. I wanted to post it to get feedback about the design. With this setup you do not have to mill the down the ACME rod. This means that you can select multi-start rods to speed up the axis. Also the acme rod can be cut to length to any size.

The setup will use the following

http://us.misumi-ec.com/
2x HFS5-2020-100

http://www.dumpstercnc.com/acme_38122.html (Can be other 3/8" rod, I chose 3/8" 2 Start)
1x AC38122-LN
1x AC38122-AC
2x AC38122-TC

http://www.mcmaster.com/#99030a024/=qwv4ly
1x 3/8"-12 Size, 1/6" Travel/Turn, 3' Long, Right-Hand Thread, 2 Starts

2x 3/8" id Flanged, Shielded Ball Bearing (FR6ZZ)

Also I will have to find Square head bolts to adjust the wheels since they will be using T-nuts into the 20x20 extrusion. Sorry it is only rendered in 2d I have not learned to CAD in 3d yet.
Attachments
New Z-Axis.jpg
New Z-Axis.jpg (88.91 KiB) Viewed 2120 times

dataway
Posts: 107
Joined: Tue Aug 27, 2013 7:38 pm
Location: Big Bear Lake, Ca

New Z-Axis (Non Milled Acme rod with AntiBacklash Nut)

Post by dataway » Sun Mar 02, 2014 5:46 am

Wow very cool, I will be watching your progress..how are you mating the rod to the motor, does it need to be machined down to fit into the coupling?
Shapeoko 2, Dewalt DW660 1/4" shaft/ 1/8" shaft, 3D printed Dust Shoe,Dual Y Axis.

jzhvymetal
Posts: 21
Joined: Thu Nov 22, 2012 1:36 am

Re: New Z-Axis (Non Milled Acme rod with AntiBacklash Nut)

Post by jzhvymetal » Sun Mar 02, 2014 7:01 am

Dumpster CNC motor couplings and shaft collars are threaded with compression. Meaning no milling is required and it will not hurt the threads. Motor coupling is ordered based on motor shaft and other end is threaded with a compression collar. Shaft collars are used to hold the flange bearings in place. All other DIY CNC use the same design and has been proven to work.

dataway
Posts: 107
Joined: Tue Aug 27, 2013 7:38 pm
Location: Big Bear Lake, Ca

New Z-Axis (Non Milled Acme rod with AntiBacklash Nut)

Post by dataway » Sun Mar 02, 2014 4:42 pm

Thanks for all of your research I may follow your lead on this to see if I can also put this together on my S2
Shapeoko 2, Dewalt DW660 1/4" shaft/ 1/8" shaft, 3D printed Dust Shoe,Dual Y Axis.

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