Newbee looking for advice

[dandy]

how do i get this picture big enough to see???????????

[Clive S]

how do i get this picture big enough to see???????????

it is big enough to see if you double click on it. What are you going to use this for?

[dandy]

im hoping to get this to slot into my bench when needed, do a bit of routing, like signs and name plates and house numbers and so on, and when its in the way i can take it out, put it on the shelf - or in the bin and be done with it. TBH if im really honest i dont really know. but i want to build a cnc

[JAZZCNC]

Your wasting your time with this design and approach. It's doomed to fail. Far too complicated for no gain and woe fully under built to be any use for cutting anything but chocolate.
I suggest you take step back look around the forum at other builds to get an idea of whats required for good machine.

The simple truth is there is no quick cheap way to build CNC and trying to cut corners will just cost you more money in long run, Happens time n time again. Theres also no point trying to reinvent the wheel or waste time and money with proof of concept. Only so many ways to build router so just look around find what looks and works good then copy or use it for base of your design.

Get looking and do some serious research. DONT BUY ANYTHING other wise 99% chance you'll waste money.

[dandy]

And there I was getting ready for the Queens prize for engineering, bought the tie aswell, you really took the jam out of my donut there jazz!! But on a serious note the sketch was just to show what I was thinking with the belt. It looks like I better start with a stand alone system to begin with. Done a bit of research last night and hats off to jazz,Clive s and a few others, pointers and advice coming from all directions so keep up the good work, this place is nothing without your help

[dandy]

I want my jam back.....

[dandy]

heres my first attempt of the bed. made from 50x50x2 box section for the main frame and the bed will be 40x20x2. i will have A-frames under the centre of each beam and get rid of the uprights. this will also allow for ball screw option for the x axis.

i cant help thinking here that 50x50 isnt stiff enough but with A frames should be ok

the actual size is not determined yet, im just hoping im barking up the right tree here but probably looking at 1100y 900x

hiwin or similar rail for the x, not round i just dont like it.

big question ???? how accurate or square do the x axis members need to be with regards to setting up the rails? i suppose i mean if theres a slight twist in the box section.

must do more research

[Clive S]

TBH if im really honest i dont really know. but i want to build a cnc

Ok but if you are really serious you need to get some proper drawing done but first look through some of the build logs on here to get ideas as the the one you have put up I don't think will even ice a cake. Please don't let this put you off. So decide on a cutting size you want and then half it. To build a decent machine you will need a budget of around £1500 - £2000 using decent drive, motors, screws rails etc. Also the golden rule is don't buy any electronic stuff until you have the frame designed and sorted. Good luck with the build. My first one took me about 10 months from start to making chips and all knowledge was gleaned from this forum.

[dandy]

ho right its a thumbnail so just click on it.........


so the trasparent like boxes were my original thought of twin motors driving the screws, but as pointed out by jazzcnc a single motor with a belt running the two screws would be a better option. Now looking at it i would need a few extra pulleys because i want this belt outta the way hidden in the box section, nice and neat, like a pro who knows exactly what needs doing right!!!!
........any comments greatly appreciated as its my first build.

the gantry will be riding along the x supported by bearings i have lying around which will be driven by the screws through slots in the x(in red in the thumby thing for the feckless incompetent wannabees who keep asking for constant advice and inspiration and general nappy changing) , now the footprint for the gantry isnt quite complete, infact scale is out the window here its just concept like a guy in his shed out of earshot from the missus and nothing to do but build (or try to) (or think to try to) a cnc system.

im still thinking on leads for the x purely so i can weld straight to the nuts, no fuss with the bare minimum expense just to prove test, after which i can replace with suggested ballscrews and use said leadscrews for shelf supports............... pictures to follow

of course the z is missing as its far beyond comprehension right now.

the reason it is designed like this is because i want it to drop into slots i am yet to cut out of my bench and clamp into place, the bench coincidentally doubles up as a table saw, but you dont want to go there..... no yet.......not with a 24" blade,

the question really is does the belt fit the design?


so TIA for any comments or questions,