Im new, am a 3D designer. Need a New cnc machine and need advice and guidance

[FlyHighRC]

ahh yeah, just looked at this site, not too bad at all 31T10/25-2 | Ondrives

Im revamping my old design, the frame im happy with...i cant see there being much wrong with it after i strengthen it which was the main critique with it. So I have stiffened that up now. Also the gantry is sitffened up which I will show later, mian change is 2 pieces of 6mm plate welded onto the box section and did away with angle Iron(Which I call L Bar) where the Lbar was is now replaced with 6mm steel welded onto the boxsection

Green is 6mm plate, Note, I will need to extend the bottom 6mmplate awayslightly to make room for the bolts close to the vetical 6mm piece

[Clive S]

As a matter of interest have you thought about how you will fix the ball nut and bracket to drive the Y axis it seems you are running the screw through the uprights in the gantry. Also there are cheaper places to buy belts and pulleys. ..Clive

[FlyHighRC]

Yeah I realised that haha, Did it at half 7, Ill put it to the mrning haha, those uprights in the gantry will be behind the horizontal box sections

[JAZZCNC]

ahh yeah, just looked at this site, not too bad at all [url=http://www.ondrives.com/p/9519/31t1025-2]31T10/25-2 | Ondrives[/url

Nah too expensive try these people or go to your local bearing supplier as they are often cheaper and will sell without Vat for cash.
http://www.beltingonline.com/timing-pulleys-bars-272/

Your gantry is looking slightly better but still needs work. Also by the looks of it you haven't given much thought to how the ballscrew end bearings will mount and how the motor will connect.? Has it stands now it can't be done without special machining and using FF/FK bearing blocks.

10mm plate would be better for the bearing plate 6mm is still a bit flimsy.! Can't afford any flex or resonance here.

[FlyHighRC]

Nah too expensive try these people or go to your local bearing supplier as they are often cheaper and will sell without Vat for cash.
Timing Pulleys

Your gantry is looking slightly better but still needs work. Also by the looks of it you haven't given much thought to how the ballscrew end bearings will mount and how the motor will connect.? Has it stands now it can't be done without special machining and using FF/FK bearing blocks.

10mm plate would be better for the bearing plate 6mm is still a bit flimsy.! Can't afford any flex or resonance here.

Do you have any SW fil;es for the pulleys? what Pulley width? Im assuming 16mm should do it? That belt must be very strongi guess? When the gantry comes to a sudden stop wont its inertia and the belt cause it to pendulum a little?

[FlyHighRC]

Right, I have beefed up the gantry quite a bit now, Though the problem IM having now is difficult access...

As you can see from the pictures below, having mounted the block the ballscrew doesnt extend far enough so i though i could add a coupler than add some 6mm rod which will go on one end of the coupler and the other end, the pulley. Pretty complex way so unless you guys say thats ok ill scrap that idea... would also need to cut a whole in the vertical box section to be able to tighen the coupler

[njhussey]

How's your ball nut on the gantry going to connect to the Z axis? The way youve got it its going to be impossible to connect...

Sent from my Galaxy S5

[FlyHighRC]

Yeha i know haha, did that at like 7 right out of bed thus was a design that cant be done haha. They will be behind the horizontal box sections :)

Is the pulley mounting system ok? Or in need of a severe redesign?

[gavztheouch]

It might be easier to use one large piece of box section for the gantry. Something like 150mm by 75mm, that way you have one nice flat surface after expoxy leveling to mount all your rails and ballscrews bearings. You also need a way of tensioning the motor and pully belt, slots in the mount would be fine. You might want your slots in the same axis as the center to center of the motor and pulley?

Another thing, you want to keep the pulley on the ballscrew as close to the bearing as possible.

[FlyHighRC]

Another thing, you want to keep the pulley on the ballscrew as close to the bearing as possible.[/QUOTE]

so now coupler as a way to extend? :/ If so that allot of travel lost in the y axis... as i would need to bring everything closer but keep machine dimensions similar..

i think the best thing to do is a gantry re design perhaps??