Sturdy and Fast all Steel CNC , my first build

[JAZZCNC]

However i wonder what step/micro-stepping should i use with the 1605/z/ and the 1610/x,y/ ballscrews? having in mind the way i build the machine.

Well depends a lot on your PC and how good the parallel port is and what speeds your looking to achieve. PP and PC speed to some degree will determine the Kernal speed in Mach3 and how many pulses you can put out which in turn will determine the speed you'll get from the machine. Higher micro steps require more pulses to achieve same speed has lower MS but they give smoother running motors and to a lesser extent some resolution.
Personally I don't go higher than 10x or 2000ms and this is my preferred choice if PC can handle it. Higher MS also helps with resonance but these drives are great with handling resonance so it won't be a problem and if it is you can change tune it out using the software.

So i asume rising is Pul High and falling edge is Pul Low. I wonder which one will work with my C23 board from CNC4PC

I would agree but check with Arturo and I'm think it may even be possible to change a jumper on the board has well to suit but either way your covered because the drives allow it.
If you can't find out then you'll have to make some witness marks run some G-code and then check if it's lost position. If the pulse is on the wrong side it will drop a step on every direction change so won't take long to find.

[Boyan Silyavski]

Thanks a lot guys!

Yes 300ipm / 8mpm/ is the speed i aim considering the tooling/price and the spindle speeds.

8 microsteping was what i had in mind. I have tested the PC upto 100Mhz as far as i remeber and it was Ok. With other BOB, but i assume will run with this also.

Anyways i will make to files for Mach3, one for 100ipm and one for 300ipm, as the guy is new to this, so at first untill he is aware what he is doing...


On my small commercial machine the z steps in mach3 was set to 10000? this is quite high micro stepping, thats why i wondered, on the other axis is 8 microstepping. reverse calculating it the microstepping in z is 256, i am not quite sure now for the 10000 but it was ridiculously high.

[JAZZCNC]

8 microsteping was what i had in mind. I have tested the PC upto 100Mhz as far as i remeber and it was Ok. With other BOB, but i assume will run with this also.

Don't run that high thou otherwise high chance of troubles. Only set the Kernal speed high has needed and no more. 25Khz is the best and every increase above increases chances of trouble. Wouldn't go above 60khz no matter what driver test says or PC thinks it can do.!!
If you need that high pulse rate then buy motion control card, in fact I'd buy one anyway if you want the best performance from machine.!

[Boyan Silyavski]

Hi guys,
thanks to all for the valuable inputs.

For now i have to wait until they cut with laser the pieces, so i can proceed further.

Meanwhile as a thanks to all for the help , here is the Sketchup file/its in winrar format for easier transfer/. So anyone who wants can use it as it is, use parts of it or just use the components or table drawings. Before ordering the laser cut parts i revised it piece by piece and against the ballscrews, housings, etc. So all small errors are fixed. It cost me a whole day to rework it precisely. The empty spaces are for epoxy, there are some clearances where necessary. The machine has work area of 400x1000x200 . Any questions are welcome if you have something that is not clear. The main point being here is that the machine is completely scaleable up to the limit of the ballscrews or with minor adjustments even up to 4x8 , this without changing the type or thickness of the profile. Other main point is that the drawing is final drawing, no need for correction before real assembly, however there are some steps to be followed, but easy to figure when playing and simulating the actual assembly. If by channce there is a small error i will fix it right away in the future.



So enjoy it and thanks again. Will update when i have more to show.

[cncJim]

Hi Silyavski,

Thank you very much for putting your sketchup files up for everyone. I am in the process of designing a new machine and learning sketchup so your files will be a big help! :)

What sort of rough price does the laser cutting cost?

Looking forward to seeing your machine come to life!

[ba99297]

I dont understand something
The cncrouter will have legs down to ground or the cnc on the left of your scetchup will be put on the white table

[Boyan Silyavski]

Hi there,
The table on the right is if sb wants to upscale it to 1000x1500 or similar,with small adjustments, using the gantry from the left. On the left is the complete machine 400x1000 which i am building now.

Furthermore have in mind the gantry can be simplified removing the raise sides if intended mainly for aluminum.

[Boyan Silyavski]

...
What sort of rough price does the laser cutting cost?
....

I ordered them in my country/ Bulgaria/ and they cost there 250 euro. + 50 for a guy to bring them when he is coming back from there in 2 weeks.

Here in Spain, the price would have been outrageous.

Anyways, its a lot of metal. I don't have the means here, that's why i preferred laser cut. But in fact if you can cut and drill and have spare time, they are quite simple to produce at home.

Now i am designing my next build and definitely will try to lower the number of parts.

[ba99297]

Let me ask something
I am planning my cnc 1500X1000 and i am very close to these plans
Is it better to weld everything together or make seperately the base and then the cnc machine that will "sit" on the table. I am asking because if i weld evertything together my construction will be very heavy ( difficult moved even by 3 or 4 people )
What is better
Solution 1
one unique construction ( both table and cnc together ) or

Solution 2
two seperate constructions( the cnc and the table). Will this second solution have stiffnees issues ?

Thanks for your time

[ba99297]

By mistake i upload the same reply two times. Sorry