operation cnc

[kingcreaky]

Hi All.

Quiteness is due to a lot of thinking, and sketching.

Towards the end of last week, I was put in touch with a guy who was selling a used "branded" machine, capable of cutting 8x4 sheets, with vaccum bed etc. It was going cheap due to all the electrics being shot. However, cutting a long story short I dont think its still a viable option, he was initially talking about a lot less money than he is now, then there is the logistics of moving it etc, and I dont think its going to be exactly what im after.

Im thinking 1400mm x 800mm x 300mm. with the conventional setup (having x being the widest axis) and having a shorter y. Unlike what I previously suggested earlier in this thread.

Being Realistic, I simply do not have the skills to be able to pull off a spun- ball screw nut. Manufacturing all the housing etc is just out of my depth. (as previously suggested), so my first question is

1,)What is the maximum length I can have, with a conventional 'spun-ballscrew' setup (keeping the nut static)?

I intend to have two screws for the x axis, (one on either side)

The ballscrews descibed in the ebay auctions (linearmotionbearings2008) detail as being 'end machined'

4 pcs of anti backlash ballscrews RM1605-350/800/1450/1450mm-C7(4screws+4ballnuts+4endmachined)
4PCS NUT HOUSINGS/BRACKETS FOR THESE 3 BALLNUTS
4 sets of BK/BF12 with locknuts and circlips+ 4pcs 6.35mm*10mm flexible couplers
Linear slide rails SBR20-600mm(2 supported rails+4 SBR20UU bearing blocks)
Linear slide rails SBR20-300/1400mm(4 supported rails+8 SBR20UU bearing blocks)


so with the 'flexible couplers' also supplied in the kit, I assume will fit my steppers ?
Nema23 Stepper Motor 3.1Nm x 3