[assadi]

Hello,
Does anyone have tried the CCM rails for building CNC plasma ?! It seems suitable for that. According to the manufacturer
CCM W45-15 linear module
Positioning repeatability: <0.05MM
Load capacity:*15KG
Width: 40MM
Pitch: 75MM (the linear travel distance is 75mm per one motor rotation, so if i used nema 23 motor with 1000rpm the speed is 1.25m/s)!!!
Max length: 4*meters
1) high accuracy
2) customised length up to 4*meters
3) anti-corrosion
4) maintenance-free
5) noiseless
6) low vibration
7) high reliability
8) high durability
9) flexible*add-ons
10)*warranty up to*5 years
According to this parameters is it suitable for plasma cnc ?!

https://www.ccmrails.com

http://www.mjunit.com/

Can i use 3 units 2 for x axis and one for y axis ?!

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[mrsa]

what is the difference between ccm rails and mjunit ? Seems both sell the same products..

[rodw]

You really need to add a 3:1 reduction ratio to get your motion back in the right range otherwise you will get a lot of jerky motion (I nearly made the same mistake as you but a couple of guys stopped me). The gear boxes will usually have a fair bit of backlash but its not hard to build a timing belt reduction that bolts onto the NEMA 23 mounting holes (which is what I did).

Read my journey here https://forum.linuxcnc.org/30-cnc-ma...e?limitstart=0

PS, I found the maximum speed I could get out of my cheap NEMA 23 was 750 rpm using hardware step generation from a Mesa 7i76e ethernet board and 20x microstepping. I doubt you'd get that speed out of a standard breakout board. (the Mesa board can do up to 10 Mhz). I had worked on max RPM of about 460 rpm based on my experience with an Arduino so I was very surprised!