General thoughts on this CNC?

conetip said:
You are correct about the quality of some places to make rolled ball screws. The latest I have seen on rolled screws from Germany, are as accurate as ground ones.

The video is nice, but preloaded backlash free ballscrews are not that free moving.
Neil
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What? you must be joking about preload?
But yes , most people think china rolled ballscrew, They are not even precision rolled. Just rolled

Here machine that makes molds everyday in rigid foam, just as hard as aluminium in some cases

https://www.youtube.com/watch?v=BX50c36z__E
 
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conetip said:
I can't speak for George, but on the set up I am buying, I helped in it's initial design and manufacturing. On the ball screws, there is only a thrust retention on 1 end of the ball screw. Thrust and secured from 1 end only, the other end is supported but can float in the axial moment. This was intentional on our soon to be My machine. The reason was the screw is steel, the frame is Aluminum. They expand at different rates, so allowed for the difference in lengths to take place in the end shaft support. This is done on all the axis screws. The total movement between a hot day and a cool night is not really huge, but it is still there.
The motor to the shaft is coupled through one of those special flexi couplings just like what Hardinge use on their super precision lathes, but only smaller ones. The other option was to use wavey spring packs on the end of the leadscrews to keep tension on the screw the whole time. But there has not been any problem with what we have made so far. The only upgrade is going to be more powerful stepper on the 3 axis to handle the ruffing out of steel parts.
Neil
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You would not use a thrust bearing on a ballscrew, You use angular contact bearings.On motor side double row for axial and radial load support. On free end is a radial bearing.
On a real ballscrew you would not use spring packs? you use sping on leadscrew (acme screw) Steel parts, any size motor will do steel. when doing steel , rails and low RPM spindle are the most important
 
LGSM3 said:
Neil, your method of retention is sound as well as typical of good machine design. It is exactly what I'm questioning on the zero machine
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I don't understand questioning XZero machine?
I use proper bearing, motor side double row, with max 10miron run out.
Free end side has 5mm to move freely if needed . if lucky 2 micron movement with expansion
 
LGSM3 said:
Randy,

I find that odd as well. Is it common for ballscrews that are sourced from Taiwan or Japan to be routed through Hong Kong?

Don't get me wrong, I don't want to be that guy who only tries to blow holes in his scenario, but I am that guy who believes that if it seems to good to be true then it usually is.

With all that being said, if George would consider threading the ballscrews and confirm the origin of ballscrews to be a quality source, I'll buy a frame
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Threaded ballscrew is not a problem, But with double row angular contact you don't need to have nut for preload on bearing because they are already preloaded
 
LGSM3 said:
Randy,

I find that odd as well. Is it common for ballscrews that are sourced from Taiwan or Japan to be routed through Hong Kong?

Don't get me wrong, I don't want to be that guy who only tries to blow holes in his scenario, but I am that guy who believes that if it seems to good to be true then it usually is.

With all that being said, if George would consider threading the ballscrews and confirm the origin of ballscrews to be a quality source, I'll buy a frame
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Honestly, I could care less where they come from. I know first hand there are more than a few guys completely STOKED with their machines from George...

BTW.. I could have spent the 26k to get the Techno, but I'd rather have 4 of George's
 
gio-XZero said:
I don't understand questioning XZero machine?
I use proper bearing, motor side double row, with max 10miron run out.
Free end side has 5mm to move freely if needed . if lucky 2 micron movement with expansion
Click to expand...

George

A little scrutiny never hurt anybody, especially the open minded. I will reiterate that I appreciate your machine.

What I'm questioning is exactly what you stated above. You use a bunch of brilliant parts and then hold them together with a $5 coupling that relies on an M4? Set screw through aluminum . So yes, it kinda concerns me. How many OEMs who your product truly threatens actually resort to this method? I'll answer that, none of them. They provide components half as good as yours yet they still secure them properly.

It's just food for thought George, you have a good product at a good price point that will likely evolve. I hope it does. I also know that as you grow you will be scrutinized by people who actually know what there looking at, at which point you will likely fight this battle again.
 
pescadoman said:
Honestly, I could care less where they come from. I know first hand there are more than a few guys completely STOKED with their machines from George...

BTW.. I could have spent the 26k to get the Techno, but I'd rather have 4 of George's
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To be a million percent honest, I would take one of his machines over a Techno. I would just thread the end of the screws when they got here
 
LGSM3 said:
To be a million percent honest, I would take one of his machines over a Techno. I would just thread the end of the screws when they got here
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That is true, Tekno machine will not hold tolerances of my machines.
If i did have a problem with coupling, i would be first to change. Only problem i ever had was threaded screw.

I would not go through making my own bearing housing , ballnut housing which are expensive to make for precision needed and could use cheap china ones if i has trying to save money
 
I see a pool cue machine that looks close to a machine i made 8 years ago when i started , Machine used to sell starting at $1300. There price around $8000 to $16,000
iT was the Viper machines.
Reason i stop making the is because of the round rails,
My goal is to make the fastest, strongest and most accurate machine on the market for a real price and that where they are at now .Check pricing on profile rails and blocks, Price is over 1/3 the price on machine
 
LGSM3 said:
To be a million percent honest, I would take one of his machines over a Techno. I would just thread the end of the screws when they got here
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There is no problem getting ballscrews threaded if wanted and would not cost anything . I myself find coupling way better
 
On Threading, you have bearing retaining , then step down to thread.Then another step down for coupling. Which give you less holding surface for coupling.Which means weaker
Better than threading would be to use LOCKTITE bearing retaining compound .But leaves it almost impossible to remove bearing after without a lot of heat
 
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gio-XZero said:
There is no problem getting ballscrews threaded if wanted and would not cost anything . I myself find coupling way better
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I've been trying to log on to (register)your forum page for 20 minutes so as to purchase one of your machines but it won't let me. It wants a forum members name and I've tried a number, even your's, but it keeps rejecting them. I want to order today as some of your options dry up today. Any help would be beneficial to both of us.

Dick
 
rhncue said:
I've been trying to log on to (register)your forum page for 20 minutes so as to purchase one of your machines but it won't let me. It wants a forum members name and I've tried a number, even your's, but it keeps rejecting them. I want to order today as some of your options dry up today. Any help would be beneficial to both of us.

Dick
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Hi Dick , you just have to send email to info@xzerocnc.com for contact for machines.
To register on XZ forums, the code is XZero on the question
 
Exactly, how does the 2200.00 machine come equipped compared to the 1850.00 machine. Does it come with steppers?, a control box with drivers and such? After receiving the machine, what will I need to add to make it work? I'm sure it will need a spindle and probably a computer, CNC software, and of coarse cad/cam.

How late today have I before the sale ends?

Dick
 
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Pre sale pricing

Limited Time till April 20th or when limit is reach . After that date this price will be frame only and rest option
18x18 $1800us
18x24 $1900us
18x36 $2000us
18x48 $2200us

15mm profile rails
1605 Y & Z Ballscrews
2010 X ballscrew
Table top
MX3660 3x282oz motors , 48v power supply
cable chain
machine feet
proximity senor

Frame only
18x18 $1450us
18x24 $1550us
18x36 $1650us
18x48 $1850us

15mm profile rails
1605 Y & Z Ballscrews
2010 X ballscrew
Coupling
Motor Mounts


Some updates
Changed to 4 1/2 from 4 clearance without table top from base to bottom of gantry.
Changed to 4 longer bearing on the X long axis.
New profile with profile rail support , High precision for straightness , flatness ant twist

Mounting for two 1 inch backing bars

I need a title....like XZERO AZ liason
 
rhncue said:
Exactly, how does the 2200.00 machine come equipped compared to the 1850.00 machine. Does it come with steppers?, a control box with drivers and such? After receiving the machine, what will I need to add to make it work? I'm sure it will need a spindle and probably a computer, CNC software, and of coarse cad/cam.

How late today have I before the sale ends?

Dick
Click to expand...
For the 2200.00 special, you would need wires to steppers and an enclosure with a E stop button. Then a spindle and whatever software.
 
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