looking to make a shopping list

[JAZZCNC]

hi thanks for the welcome, i do have 1500 in the kitty but buy the time i get started i will have more, i was looking at starting with the ali extrusion,rails and ball screws
daveo

Don't start with anything.? By this I mean dont buy a single thing NOTHING AT ALL. The most common mistake made is buying parts before final design is choosen and components decided upon.

Even then still don't buy anything until you are actually ready to build then build in phases. It's good idea to get all the mechanical parts before starting on the frame so can offer them up and see any potential hidden problems you missed in the CAD design stage.

Electrics are one of the last things you'll need so don't buy those until mechanical is nearly finished. While it's tempting and exciting when it's first machine to buy motors etc and have spinning on bench it's also numb thing to do because your wasting warranty.

Don't rush and have clear plan and design in mind. Ask questions and do plenty of research until your sure you know exactly what's needed and understand why it's needed then ask again just to check you really know what you think you know.!!

Good luck.

[cropwell]

Whilst I agree with you Jazz,

I have bought most of the build kit, with only a roughed out design. I had good reason to do it that way, I had to spend the money before my wife decided something else was more important. I know that warranties will be wasted and some bits may not turn out to be appropriate, but I didn't see my build EVER happening otherwise.

At least now it won't be new carpets, furniture, decoration, etc instead. I have enough in the garage to start a construction and except for a pulley or belt or something, probably finish it too.

As my granddad used to say before they took him away - 'There's method in my madness'.

Cheers,

Rob

[JAZZCNC]

Whilst I agree with you Jazz,

I have bought most of the build kit, with only a roughed out design. I had good reason to do it that way, I had to spend the money before my wife decided something else was more important.

Easy sorted.??? . . . . Do what I did get rid of the Fat controller and retro fit with newer younger model. When starts putting demands on system do another retro fit. .

[Daveo]

ok, so can any point me to a few links so i can get an idea of what i want.as i said i would like it around 1200mm x 600mm
daveo

[Daveo]

how about these for the sides
http://www.ebay.co.uk/itm/ballscrew-...MAAOSwtnpXkHTK
extrusion
http://www.ebay.co.uk/itm/V-Slot-Alu...gAAOSwv0tVCusb
daveo

[cropwell]

Can you give us some idea what you want to cut ? It makes an awful lot of difference if we know whether you just want to gently slice spongecake or hew titanium at warp speed.

Ta

Rob

[Daveo]

hi
i want to cut carbon fibre and ally, my boy wants to do skate board decks
daveo

[Clive S]

ok, so can any point me to a few links so i can get an idea of what i want.as i said i would like it around 1200mm x 600mm
daveo

Have you done any research on the forum and looked at some of the very capable machines if you are not careful you will waste a lot of money.

It shows you have not done much as you are looking at 25mm ball screws with linear supported rails.
for a decent machine for the size you are looking at you will need 1610 on X and Y and 1605 on Z also the square rails have come down a lot in price are are far better.

First start a build log with a new post to keep all the questions in one place and then design something in cad there is no problem copying other people designs and then you will have a much better idea.
The golden rule is don't buy anything until you have a design sorted then the wise ones on here will put you right.
Good luck with the build .

[Daveo]

hi
yes you are correct, still trying to find out what i want, i have looked but cant find any builds like i want and was hoping for a few suggestion and then start reading
so the 25mm ball screws i was looking at are to big?
thanks daveo

[Neale]

Believe it or not (and you probably won't until you do the sums) an oversized ballscrew will be a bigger limitation on performance than, say, the weight of the gantry. Especially a 5mm pitch as it has to spin faster than, say, a 10mm pitch, for a given speed. When the gantry accelerates from rest, you have to spin up the ballscrew and the rotational inertia of the ballscrew will be a major factor slowing it down. Ditto fitting a too-big motor - a combination of inertia and other electrical factors will reduce performance. This is why it's important to take guidance from the community here - use their experience rather than paying for your own!