Stell frame cnc 1500X1000. Adjustable table your opinion please

[Boyan Silyavski]

Hi Vagelis,

Normally people here on the forum use ball nuts and ballscrews bought from China. The most recommended vendors are Fred from BST Automation/aliexpress/ and Chai from linearmotionbearings /ebay/. BST for sure can provide the double ball nuts , i assume Chai also. No reason to buy 2 single, but depends on the design. On Jonathans build i asked about the spacers spring washers, he pointed from where, so the info should be somewhere there. Their prices are very similar, both do perfect machining, so really its up to you.

To resume various advices for my builds, that i received mainly from Dean and Jonathan , for your size machine
if stepper driven 1:1 with short belts and pulleys on all axis:
-short belt HDT5 15 size, if heavy gantry maybe 25 size, pulleys 20t
-z 1605 screw
-gantry 1610 screw if mainly woodworking for faster speeds ,1605 if mainly aluminum
-long axis 2010 or 2005 respectively, i see no reason to go to 25xx size

the following is my personal understanding:

-gantry supports ~ 30cm/normal/ to 40cm/heavy duty/ spacing of the bearing blocks , this including the blocks-
-gantry , depends on the design, but ~20cm spacing vertical and 25 horisontal i see as minimum./ including bearings./ 30 and 30 will make very strong machine/

PS. Dont be cheap and buy Hiwin or cheaper Chinese square rails not round