About reference? Start your own build log thread, ask there questions, people will help you. Without knowing what you need, seeing your particular design drawing, working area, materials to be used, what is the main purpose of machine, knowing how much money you are going to spend, nobody could give you a good advice
Infact why not sit down and make full inventory of every small detail and give detailed pictures.?? . . . . Oh silly me you have.!! . . It's Here in this thread I just can't be arsed to bloody read.
Iman stop being Lazy and expecting everything handed on plate. Do some reading like all the others with successful builds have done.
Welcome to the forum. If you are just starting out then have a look here - it shows some of the finished machines built by forum members:
The Following User Says Thank You to routercnc For This Useful Post:
I have a question about rotating bull nut. when we use this method how fix and install the screw in table?
I want to design and then building a industrial CNC. the aim of design is milling Aluminum and moving axis must have
2500mm X axis - 2000mm Y axis and 600mm Z axis.
for this condition i start to design a cnc machine. this is a initial design and i have must better my design.
I have some question. please answer me.
1- because X and Y axis is long I used rotary bull nut. for this condition I design a rotary bull nut mechanism. is it important to use Super-precision angular contact ball bearings: High-speed for example 7015 or typical angular contact in good for this mechanism. It's notice that MY cnc machine is used for milling AL and i want to build it.
2-if the rotary speed of Spindle motor is 6000 rpm how design my cnc that vibration of this is minimum. how simulation I do in software? for example Harmonic response? and what the condition of analysis?
3- because i want to build this what's the important notice in design and assembly of the part?
Best to start a new build thread for your design questions.
Have you built a cnc machine before, or have other building experience? 2500x2000x600 is a very large machine, especially for machining aluminium. Machining aluminium requires a stiff machine and having 600mm Z travel makes that very difficult, especially with a single gantry and large overhang.
1- I've not used rotating ballnut design but the stiffness of the axis is dependent on the AC bearing stiffness/quality so it will be a factor.
2- The simplest analysis to perform is to work out the stiffness at the collet in the X Y Z directions. The axes have to be locked in some way to stop them sliding when you do the analysis. 10-20 N/um (Newtons per micrometer) would be considered a very stiff / commercial machine. You need to apply 1N at the collet and get the software to work out the displacement. I don't think what you have drawn will come anywhere near that value.
3- Design and assembly. Make sure it can be built in a particular order so you can access the bolts as you build it. It is easy to design a set of parts which can't be put together especially if bearing blocks are near each other for Y and Z axes. Also, make sure you have slotted holes and adjustment in multiple planes. Assume the stock you buy will not be flat or straight or free from twist (although aluminium ecocast / tooling plate should be pretty good).
To give you some idea of commercial machines, here is the Mori Seki. Look through the pdf file and note the travel (way less than your dimensions), and note the weight.
Also have a look at this thread :
i will not lie to you. If you have mechanical questions how to make 600mm Z axis strong and this is your first build, better contract me or sb from forum to design you the machine. You will make mistakes, that's reality. It takes much more planning to make a perfect machine, and to tell you the truth common sense is much more better than simulation software
So either make your own build log where people help you for free, or contract sb to design you the machine, at the end it would be much cheaper, as every mistake there is very costly.
It's a dead giveaway - that email was meant for his wife, ..."Hi dear". But it was sent here by mistake.
Honestly, my wife would just say, build it with whatever x axis you want Love, you know best 😉
Last edited by CharlesJenkinson; 02-09-2016 at 08:31 AM.
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