What he linked to was made of aluminum extrusions and ballscrews.

The screws mentioned are T8 with a brass nut, $5.00 ea. on Bangood!
Max.

 

But double sided boards are a challenge

The double sided boards will still be a "challenge" with a CNC machine.

 

The double sided boards will still be a "challenge" with a CNC machine.

I haven't found it too difficult. I got some 3mm dowels and I drill two 3mm holes to locate the board to maintain the position when flipping the board.

 

Why mess with that when you can get double sided, plated through hole for a 50c to a couple of $$'s?
I can just imagine a CNC M/C for $125.00!
Max.

I would be very happy if a $125 machine can make an accurate PCB. Very surprised, but very happy.

For $125, I'd buy a CNC machine just to look pretty in the garage!

Truth being told... I'm very skeptic about a $125 dlls CNC PCB milling machine... it is probably a scam.

That machine you linked is unbelievably low priced. As in, too good to be true. $125 would not even cover half the parts if ordered in bulk wholesale directly from a Chinese supplier. I second the assertion that it's likely a scam.

It looks to be very light duty with 3-D printed plastic parts. If it is brand new and you never abuse it, it might be okay for circuit boards. If it is used, it is probably loose and wobbly and no good for circuit boards. We couldn't even start to make it for that price.

If $125.00 is a lot of money to you, don't buy it. If $125.00 is pocket change, go for it. That is a cool toy and you may be able to keep it tight enough.

Reading the fine letter says it all.

If someone is offering you whatever the product is jointly with cracked software to operate it, do not be surprised that it could be a fiasco in the end or a stolen product. And not much hope of support later.

Unless it is someone hurried to get rid of good equipment thus the unrealistic price, which I doubt.

No matter what, a decent machine able to produce a passable PCB does cost, new, much more than that.

No need for cracked SW as there is lots of open source and/or free stuff out there.

ehm it's 215$ i made a mistake. sorrryyy c:

 

I am still suspicious @ $215. Maybe it is possible but....
I bought a DIY 3D printer kit a few years ago that cost me $500. It was made of 3D printed parts and some linear slides.
Maybe I overpaid.
Maybe the price has come down.
Maybe things are cheaper in your location.

I have not priced a PCB mill in a long time but years ago when I was looking, I gave up because I could not find anything that looked legitimate for under $1,000.

So I had good success with the chemical etching after a short learning curve.

 

My CNC3020T cost me £326, $437.

 

No need for cracked SW as there is lots of open source and/or free stuff out there.

Precisely that makes me to suspect. Was the seller someone who knows little of what he is trying to sell, the reference to cracked SW would not be there.

 

Precisely that makes me to suspect. Was the seller someone who knows little of what he is trying to sell, the reference to cracked SW would not be there.

I still kinda trust the seller
there's a tiny bit more expensive version that has a laser too. this one only has a mill. and they say it can't really mill anything it's mostly for engraving.

this is 342$
http://shop.aftabrayaneh.com/3_Axis...AFTAB.html?search=cnc&sort=p.price&order=DESC
also a diy kit

the last one also had 3d printed parts in the pictures.
lol there's a 150$ one that only has a laser on it
maybe the extra mall build area is the reason?

I attached the English user manual for the 215$ cnc! if I can't use it for fancy SMD stuff then I rather not buy it!

 

I still kinda trust the seller
there's a tiny bit more expensive version that has a laser too. this one only has a mill. and they say it can't really mill anything it's mostly for engraving.

this is 342$
http://shop.aftabrayaneh.com/3_Axis...AFTAB.html?search=cnc&sort=p.price&order=DESC
also a diy kit

the last one also had 3d printed parts in the pictures.
lol there's a 150$ one that only has a laser on it
maybe the extra mall build area is the reason?

I attached the English user manual for the 215$ cnc! if I can't use it for fancy SMD stuff then I rather not buy it!

OK Your call. Good luck!

 

OK Your call. Good luck!

I mean I only trust it to not be a scam meaning I do get at least some sort of CNC
does anyone have any idea what kind of PCBs I can make with it?!

 

What are you talking about? What he linked to was made of aluminum extrusions and ballscrews.

There are many plastic parts on that.
Maybe the whole left to right carriage is plastic.
The lower left view doesn't have an end bearing on the lead screw.
Any kind of milling machine would have a cast base / frame even if it is aluminum, not an assembly of many extrusions. There isn't even a cross brace on the bottom square frame.

 

T8 (Acme) with Brass nut.
Max.

 

T8 (Acme) with Brass nut.
Max.

With probably considerable backslash for PCB purposes... unless it's somehow preloaded, but I can't see it in the pics

 

I am not sure how many low end systems have backlash compensation built in.
Where the back lash is measured with dial gauge and then the number is entered into a parameter, it comes into play when when a screw comes to the end of a move and then reverses, the screw turns the amount of the backlash before the distance is is recorded as moving.
Higher end systems use this method.
Max.

 

I am not sure how many low end systems have backlash compensation built in.
Where the back lash is measured with dial gauge and then the number is entered into a parameter, it comes into play when when a screw comes to the end of a move and then reverses, the screw turns the amount of the backlash before the distance is is recorded as moving.
Higher end systems use this method.
Max.

That's one way of doing it, but wouldn't backlash in the axis that is not performing motion make the tool vibrate somehow while cutting?

 

There are many plastic parts on that.
Maybe the whole left to right carriage is plastic.
The lower left view doesn't have an end bearing on the lead screw.
Any kind of milling machine would have a cast base / frame even if it is aluminum, not an assembly of many extrusions. There isn't even a cross brace on the bottom square frame.
View attachment 136125

Good catch. I didn't notice. They 3D printed everything to look as if made from aluminum. They fooled me already and I didn't even order it.

 

That's one way of doing it, but wouldn't backlash in the axis that is not performing motion make the tool vibrate somehow while cutting?

With a stepper, it would have to rely on the holding torque, with a servo, the controller knows via the encoder if the axis has moved by some external means and not from positioning and should correct it.
Many of the high end servo controlled CNC systems have the option.
Max..

 

With a stepper, it would have to rely on the holding torque, with a servo, the controller knows via the encoder if the axis has moved by some external means and not from positioning and should correct it.
Many of the high end servo controlled CNC systems have the option.
Max..

Maybe I didn't explain myself correctly. Even if the motor (stepper or encoder) firmly holds the screw in position, if the nut has backlash it will be reflected in the finish and precision of the cut being made due to its possible axial oscillation during the process. That's why I always use preloaded nuts in my designs.

 

Oh well no cnc for me then Lets hope easyEda sends me my PCB and it works cause I don't wanna wait another 40 days after the 40 days shipping is done if they are actually right.

 

That's why I always use preloaded nuts in my designs.

Me to, But the 'Big Boys Systems' have this feature, for good or bad!
Max.