Building My First CNC Router, Looking for Advice & Other Info

[Clive S]

Hi All,

Low Profile L1016 Linear Rails & Carriages from Automotion Components - On all Axis

4NM Nema 23's on All Axis ( This Kit: https://www.cnc4you.co.uk/CNC-Kits/S...-4-Axis-Nema23 )

Dual RM2010 Ballscrews on X Axis
Single RM2010 Ballscrew on Y Axis
Single RM1605 Ballscrew on Z Axis

Appropriate Fixed & Floating Blocks on each Axis.

Ebay / Chinese 2.2kw Water Cooled Spindle


So that is the rough spec of the machine currently, the main things i am concerned about so far are:

- Controllers - The motor & driver kit comes with a parralell breakout board, however i want the machine to be compatible with newer Laptops (Windows 10 x64),

- Endstops - Mechanical endstops are common practise on 3D printers, i see many Router builds done using proximity sensors or hall effect sensors, are any recommended for maximum repeat-ability?

- Resolution - Will the 10mm pitch and 5mm pitch provide me with a balanced resolution / speed combination, i was advised previously that 2005 screws on the X & Y might hold back achievable speeds - or that i might be disappointed with the feed rates they would achieve.

- I was considering buying the ballscrews from china, if they arrived with runout evident, could they be straightened, or might they straighten out once fixed in position?

Any help / criticism / heads up on missed items would be greatly appreciated.



Thanks

Alex

Welcome to the forum Alex.

Some comments: Kits of parts are never a good idea, I hope you have not purchased them yet.
Nema 23 4nm are overkill I would use and have done several times nema 23 3.1nm from the same source now then that kit is using a 36v power supply you really need about 68v to get the best out of the motors so build your own (look up Joe's excellent vid https://www.youtube.com/watch?v=WISDqx-e23M ) go for AM882 drives from China as they have stall detection etc (you will need that if you are putting two motors on one axis)

Linear rails and ball screws can be got from Fred at BST [email protected] China very reliable guy.
Just email him for a quote and mention the forum. You may need to have the F length on the screw to be altered from standard 15mm say to 30mm to fit the pulleys Your screws are fine for what you want to cut.

Spindle again China be careful with the vfd as there are two types that look the same to the untrained eye. So post a link here before you buy.

proximity sensors are good and cheap about £3.50 china or ebay

Finally keep all your questions in one place then people can see what you are doing and chime in
Good luck with the build

Edit go for 20mm rails all round 15mm are fine but much harder to deal with.
Edit Just noticed the screws 20mm!! I would use 16mm all round but it depends on the length.