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Messages - JoeS01

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In AutoCAD 2018, I  made a simple drawing , a U shaped 3 sided drawing, with the 4th side a curve of radius 150mm. Save as a dxf file and a pdf file showing the dimensions ( see attached).
In AutoCAD, in DWG TrueView and in DWG FastView, and in  DWGSee Pro, the curve is very smooth, no sign of any faceting.

When this DXF file is imported into Mach3, the end result is a faceted curve, and the CNC router cuts it like that.
When the DXF file is imported into Easel (see Inventables.com), the faceted curve appears again , as per the attachment CNC Image.pdf

Can anybody please advise what might be happening to make these faceted curves appear, and the best way to prevent it and get a smooth curve on the CNC router?

kind regards to all,
Joe

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Mach4 General Discussion / Re: System recommendation for newbie
« on: November 04, 2019, 04:57:17 PM »


Quote
as opposed to Darwin

Thanks Craig. Loved the Mach 3 reference

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Mach4 General Discussion / Re: System recommendation for newbie
« on: November 04, 2019, 03:38:00 PM »
Thanks joeaverage and Tweakie.CNC for your helpful replies.
JoeA nicely articulates why my preference is for Mach4. So with my old Compaq dc7700 computer with parallel port , USB and Ethernet sockets, what operating system do you suggest I install - Win 7 32 bit ?
I like the strong support here for Gecko G540. Do you connect each of the 3 stepper motors directly to it? And does it have a speed control for the spindle motor?
On the faulty Chinese CNC3040 controller that I have, the supply to the spindle motor is 48V DC at the output of the bridge rectifier, but it rotates  when tested with a small 9V battery, albeit slowly. So I am not sure what actually reaches the spindle motor after its speed control electronics.

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Mach4 General Discussion / Re: System recommendation for newbie
« on: November 04, 2019, 07:09:09 AM »
Thank for taking the time to do these replies, I appreciate your effort sharing your knowledge.
I  was given a CNC3040 by a relative who bought it off someone who had given up getting this working. I  have never met the original owner. I  have never seen a CNC controller before.
I  checked the controller and found the 48V to the spindle was not on the output side of the bridge rectifier on the PW3618 circuit board. There was the correct voltage from the toroidal transformer.  I  could not find a replacement circuit board. The previous owner had bodgied it up, and tried to use parts of the controller, and parts of a remote controller  with 3 stepper motor drivers.
So I  had to start from scratch. I  thought the best way to go was to get a new control box to replace the existing one shown in the pictures found here: http://www.dasq.com.au/CNC/

i  found a Compaq dc7700 with an integrated parallel port and USB socket , and thought this might be able to be used to drive a new controller, but am uncertain as to which software to use ( Mach3 or Mach 4)   and what computer operating system and interfacing equipment was needed to interface to the controller.

That is where I  am at right now. any and all help is greatly apprecaited

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Mach4 General Discussion / Re: System recommendation for newbie
« on: November 04, 2019, 04:27:26 AM »
I  have tested the 3 stepper motors. Firstly the 2 coils on each have the same resistance ( about 3 ohms). When connecting a LED across each of the windings, it flashes when I  turn the motor by hand. It does not turn smoothly, but rather in little steps.

 When I apply a 9 volt battery to each winding, it steps in one direction, depending on polarity,  and then locks until the polarity is reversed.

Does this indicate what type of servo it is?

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Mach4 General Discussion / Re: System recommendation for newbie
« on: November 04, 2019, 03:33:04 AM »
Thanks KatzYaakov, how do I do that, please?

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Mach4 General Discussion / System recommendation for newbie
« on: November 04, 2019, 01:09:35 AM »
Hello, I am new to CNC.
 I have a CNC3040 mini-CNC 3 axis engraver with faulty controller that needs replacing. The manufacturer wants a lot of money for it.
I have an old HP Compaq dc7700 low profile desktop computer, 2 GHz CPU and 4GB RAM  with a Windows 7 32 bit system. This PC has a parallel port, USB 2.0 and Ethernet ports. It also has a separate Radeon 6450 video card with 1GB memory.

Can anyone please suggest the best configuration of hardware and software to get this system up and running ?  My preference is to run Mach 4 software if you agree that is the best way to go

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