New build - Steel - 3 Axis initially then conversion to 4 axis.

[Slixxor]

Hi guys,

Dave here. I'm designing a new machine for the office in the hopes of carving precision rifle stocks (4 axis) and whatever else is required from hardwood and aluminium. :)

The build is already underway and frame currently ready to be painted.

Details of the build
==============

Linear bearings: SBR20 fully supported rails - X:1300mm - Y:1000mm - Z:450mm
Ball screws: RM2005 Chinese - X:1350mm - Y:1050mm - Z:500mm
Steppers: Nema23 - 23HS45-4204S
Drivers: M542H
PSU: 48V 600w DC

Frame/Chassis: 65x65x3mm box steel
X axis chassis: 75x75x4mm box steel
Gantry cross beam: 200x100x5mm box steel
Gantry supports: 300x125x10mm steel angle
Z axis supports: 200x480x10mm steel plate

Contrary to most builds on here I do not have a CAD diagram to show as the build is a running design at present. I have very little CAD skills unlike my wife, who regularly makes designs in Solidworks.

Here's some pics of the current build:

original design


Adjustible feet


Front on view - all level within ~1mm


Side view


Z axis setup.


Gantry side on.


Anyway, thought i'd share guys. let me know what you think. :)

- Dave.

[routercnc]

Looking good so far Dave.
Any reason for the 2005 ballscrews? The 1605/1610 are more popular because they have lower inertia which helps with the acceleration and deceleration, especially on the modest 48V you are using.

[Slixxor]

Looking good so far Dave.
Any reason for the 2005 ballscrews? The 1605/1610 are more popular because they have lower inertia which helps with the acceleration and deceleration, especially on the modest 48V you are using.

I havent purchased the PSU yet. so may go larger. the motors claim to have a max voltage of 48v. i can get a 60V no troubles but am not sure of the impact that would have on the steppers. As far as the RM2005's goes, i was aiming for a rigid setup for cutting aluminium and didnt want any wobble from ball screws. Feed rate isnt that critical for me.

[Clive S]

I havent purchased the PSU yet. so may go larger. the motors claim to have a max voltage of 48v. i can get a 60V no troubles but am not sure of the impact that would have on the steppers. As far as the RM2005's goes, i was aiming for a rigid setup for cutting aluminium and didnt want any wobble from ball screws. Feed rate isnt that critical for me.

I wouldn't be worried about the steppers but the drives in your spec you have said that you are using these M542H If I am not mistaken the max voltage they will handle is 50V so 48V would be too high for them. AM882 drives would be a better choice running at about 68-70 V.

If you want a decent machine you have to have decent electronics.

[Slixxor]

I wouldn't be worried about the steppers but the drives in your spec you have said that you are using these M542H If I am not mistaken the max voltage they will handle is 50V so 48V would be too high for them. AM882 drives would be a better choice running at about 68-70 V.

If you want a decent machine you have to have decent electronics.

Ok, it's now being considered. :) havent bought the drivers yet either. you are right indeed, my voltage restriction was the M542H. price is only AU $20 more per driver.

[Clive S]

Ok, it's now being considered. :) havent bought the drivers yet either. you are right indeed, my voltage restriction was the M542H. price is only AU $20 more per driver.

Ok then if you have not bought the motors either then try and find 8 wire so they can be connected in parallel and get the lowest inductance motors you can find these are proved and tested by many over here :- http://cnc4you.co.uk/resources/Stepp...1B%203.1Nm.pdf.

Good luck with the build.

[Electroconducive]

Rails on the spindle plate. To make a variable lever. Bearing blocks spaced at 50% of z travel and as wide as possible.

I'll let the resident experts correct me if I am wrong. I'm still drawing up my design. However, this is my understanding.