BIG Problems with my CNC

BIG Problems with my CNC

Postby Roskrow » Wed Feb 15, 2017 6:17 pm

I use a GX -6060 CNC
I have had the machine for a little over a year, and have had no problems until now.

It appears that the X and Y axis are both working fine. But the Z axis has gone mad.

If I set it up so that everything is set up that zero is the bottom left corner. It starts correctly, but within a few second the Z axis does not respond and just cuts lower and lower into the work. I now use Aspire, but previously was using another well known Software. I have tested it using bothe types of software, but with the same result.

If I move the Z axis down to the surface and then raise it instead of rising smoothly it now rises in, I can only say. 'lurches'

Has anyone any ideas as to what is wrong. For example is it a fault in the Router, or is it likey to be a fault in the electrical equipment within the machine.

Any suggestions would be MUCH apreciated and/or does anyone know a CNC expert in the Bristol are who might be able to come and sort me out.
In anticipation many thanks
Malcolm Farrant
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Re: BIG Problems with my CNC

Postby kyeakel » Wed Feb 15, 2017 9:55 pm

I don't know your CNC machine, but I'd look for loose mechanical connection between Z axis motor and ballscrew or pinion gear. If not check for binding, lack of lubrication on Z axis bearings. There could be an intermittent connection to the Z axis motor, have you checked the connector and wiring? To check for Z binding, loose mechanicals I'd write a small G-code program that just moved the Z up and down repeatedly.

Kipp
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Shopbot PRT 9648
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Re: BIG Problems with my CNC

Postby Roskrow » Thu Feb 16, 2017 10:58 am

Thanks Kipp I will investigate.
Best wishes
Malcolm
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Re: BIG Problems with my CNC

Postby garylmast » Thu Feb 16, 2017 1:41 pm

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Re: BIG Problems with my CNC

Postby Roskrow » Thu Feb 16, 2017 6:13 pm

Garylmast, Many thanks for the link.
The last itm in that is MOSt interesting. I will have a word with a Friend whi is a computer Wizz Kid and seek his view.
Best wishes Malcolm
Roskrow
 
Posts: 22
Joined: Sat Jul 09, 2016 7:02 pm
Location: Bristol UK
Model of CNC Machine: GX-6060 CNC Router Table

Re: BIG Problems with my CNC

Postby Roskrow » Sun Feb 19, 2017 5:07 pm

MY PROBLEM IS SOLVED.
Thank you all for trying to assist me.

By sheer chance I found what was wrong.

I bought this machine diect from China. I had earlierv had a number of issues as to how they had finished my machine.

What I discovered was that the Z drive motor is connect to the drive shaft by a link with 4 allan key bolts. These I discovered were slightly loose.With the result that at times the shaft was not turning accurately.

All so simple, and at no cost (except my brain which has driven me even more mad)
Once I had tghtened up all four bolts my CNC worked like a dream

Again thank you all
Malcolm
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Posts: 22
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Location: Bristol UK
Model of CNC Machine: GX-6060 CNC Router Table

Re: BIG Problems with my CNC

Postby martin54 » Sun Feb 19, 2017 8:25 pm

Malcolm, good to hear that it is fixed, that was actually what Kipp told you to check for in the first post after your question :lol: :lol: :lol:
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Re: BIG Problems with my CNC

Postby coherent » Thu Mar 02, 2017 1:29 pm

Glad you found the issue. 95% of the time missed steps are caused by a mechanical issue. A good practice is to use some thread lock on everything that moves or vibrates!
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