new build opinions required

[george uk]

Hi

Thanks all, exactly the info i needed, i was not thinking about these

The Nema24 motors are 4mH/phase and ideally need 60v but are shipping with a 36v supply and 42v drives . The Nema23s are 3mH/phase and ideally need 55v and ship with 38v supply and 50v drives.

and

Now the thing you don't realise is that what's important is the Inductance rating and often the larger 4Nm motors have much higher inductance than the lower 3.1Nm and this means they don't perform has good.

are both important bits of info, dont you just love proper hobbyist forums

Honestly I'm not just being Negative or pulling down

I like direct answers like that, and am listening and reading.

Now it seems to me your Rushing and not really knowing what your buying or what Mass you have to move.

AM not rushing, but am eager, i have the funds in the bank.

The gantry i have planned will be below 40kg, fully loaded, probably closer to 35kg, I know how i will do the gantry, but have not finalised the design, as i need to think about what i might need to strap on to it.

I want to incorporate a turret on the end of the table, and a rotary table or b/c head on the table. and a geared 4th axis

I'll PM you my number if you want to ring me and I'll try to help.

.

I will write up fully on here what am doing and mp you, thanks.

Thanks to all of you for your replies,

[Boyan Silyavski]

AM not rushing, but am eager, i have the funds in the bank.

Me also from a month/at last/, but as i have still not finished the detailed drawing i am not eager to spend hard earned cash.

The gantry i have planned will be below 40kg, fully loaded, probably closer to 35kg, I know how i will do the gantry, but have not finalised the design, as i need to think about what i might need to strap on to it.

George,
i wonder how that really will be with the specifications /size/ you stated in the beginning? Are you sure you did not forget something? What type of gantry will that be?

[JAZZCNC]

The gantry i have planned will be below 40kg, fully loaded, probably closer to 35kg, I know how i will do the gantry, but have not finalised the design, as i need to think about what i might need to strap on to it.

I want to incorporate a turret on the end of the table, and a rotary table or b/c head on the table. and a geared 4th axis

Think you'll find your miles away with weight and to be affective and sturdy enough for cutting stone you'll be least in the 60-70's.
Like you say Speed isn't important but rigidity is massively important for cutting stone or any hard material with accuracy. To surface and cut stone effectively you'll need a slow spinning spindle with high torque, this alone will mean heavy spindle motor which will require a substantial Z axis to attach it too which will be heavy enough.
Mass greatly helps with surface finish so don't be chasing weight.!! . .. Better to be Chubby and Slow than Slim and weak.!

I wasn't going to mention this has seems you'd already ordered them but seen has Silva has already commented I will Confirm what he's saying. The cheap round rails will not take the Water and fine Grit that comes from stone dust, Add to this the weight and high vibrations that cutting hard materials will put thru the frame and they will die in short order.!!

My advise is cancel the order and Buy Proper Liner bearing other wise your wasting your time if your wanting accuracy and to cut hard materials. If you can't Cancel then sell them before using so still new and buy the correct components for the Job.