Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 13 of 13
Thread: CNC 6040 Router Z-Axis Problem
-
17th June 2013, 06:20 PM #1Novice
- Join Date
- Feb 2010
- Location
- Guildford, NSW, Australia
- Posts
- 11
CNC 6040 Router Z-Axis Problem
Hi All
I have a CNC router which has worked reliably for about 12 months. Its a Chinese one I brough off eBay. I think it was advertised as a "6040" machine. I think it has NEMA23 stepping motors as the measure 2.3" square.
The other day I made a programming error and ran the z-axis against the bottom stop which physically locked the lead screw. Unfortunately did not notice for some time that the motor continued to try and turn the lead screw. Since I did this I have a problem with the z-axis. If I zero it and start a program it seems to loose its zero position. To see what is happening I have set the z axis to go up and down 20mm 50 times from zero and then return to zero. The carriage returns to a different position each time I do this between 11 and 34mm below the original zero.
Obviously I have either damaged the motor or the driver board. I have taken the stepping motor off and when I turn it by hand I cannot feel any roughness or problem. Similarly the lead screw feels fine and turns freely.
Do I replace the motor the driver board or both and see if it improves? Could I have damaged the 4 wires between the motor and the driver? Physically they look fine, they were not crushed or anything. Should I swap it with the x-axis motor and see if it makes any difference. Would I run the risk of damaging the x-axis motor is the driver board is faulty?
I am not sure what to do next. Any suggestions would be welcome. Thanks in advance for your help.
Regards Robert
-
17th June 2013 06:20 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
17th June 2013, 08:13 PM #2
Before you do anything too drastic, I would try tightening the screws on the motor shaft. It is possible that the shaft could be slipping a bit.
Bob Willson
The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.
-
17th June 2013, 09:29 PM #3Novice
- Join Date
- Feb 2010
- Location
- Guildford, NSW, Australia
- Posts
- 11
Hi Bob
just went and checked the coupling is tight and I cannot make it slip. Thanks for the suggestion.
Regards
Robert
-
17th June 2013, 09:38 PM #4
Change the motor over with your X or Y and see what happens. David
giveitagoturning @hotmail.com
-
18th June 2013, 12:40 AM #5
When you turn on the machine and the motors lock, does the motor lock properly?
What sort of setup do you have on your Z axis?Bob Willson
The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.
-
6th July 2013, 05:15 PM #6Novice
- Join Date
- Feb 2010
- Location
- Guildford, NSW, Australia
- Posts
- 11
Further Information
Hi All
I had sometime to play a bit with much success, here is what I have done
1) When I turn the power on all three axes lock and I cannot turn them
2) The set-up on the z-axis is Steps per 320, Velocity 799.8, Acceleration 37, Step Pulse 15, Dir Pulse 10. I have used these settings for some time successfully before the present problem
3) I have swapped the z and x axis motors - the z-axis still loses zero
4) I have swapped the z and x axis driver boards ( the control box has three separate driver boards, a power supply and a break out board) - the z -axis still looses zero
5) I have complete disassembled and reassembled the z axis and can find no problems
6) I tried another piece of program that had worked previously - it too loses z zero this time by 9.5mm
Should I try a new parallel board in the computer or a new break out board in the controller box?
Could it be the control box power supply? With a DC volt meter the supply looks ok.
Could it be the cable connecting the controller board and the stepping motor?
Any other suggestion?
Thanks in advance for you help
Regards
Robert
-
6th July 2013, 06:47 PM #7
Try dropping the velocity to 200 and see what happens then.
Bob Willson
The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.
-
10th July 2013, 07:53 PM #8Novice
- Join Date
- Feb 2010
- Location
- Guildford, NSW, Australia
- Posts
- 11
Hi All
Tried lowering the velocity to 200 and reran the test. The z-axis still lost it zero. Any further advice? Thanks
Regards
Robert
-
10th July 2013, 09:09 PM #9
i had random movements of the zaxis , it would come down touch the surface then reverse on contact ,
basically random movements , not really loosing zaxis zero , but might be the same problem
broken wires in the chain carriers , my z went first , followed soon by the y axis ( china 6545 )
the wire they used was too stiff , and snapped with movement
i used the small 4 core wire , off the shelf from Jaycar ( their only 4 core ) and have ran it for over 200 hours since , also changed the plugs over to "molex" 4 pin hard drive plugs at the same time
??? clutching at straws ??? build up of friction on the rails / screws , ive been using "Lanon " in a spray can every 8 hours , it the oil off a sheep's backhow come a 10mm peg dont fit in a 10mm hole
-
11th July 2013, 09:17 AM #10
Good thought sawdust. It could well be that.
Bob Willson
The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.
-
11th July 2013, 09:25 AM #11
Same issue here
I have the same problem with my home made machine, ran for 3 years with no issue then Z started losing zero
I have had a new driver board , Z axis , Stepper motor and still have the same issue , is it possible that a broken or frayed wire in the harness could be the culpret
I'm no good at electrics or anything brainy so I am stumped
Cheers GaryIf ya can't make it perfect, make it rustic
-
11th July 2013, 01:34 PM #12Novice
- Join Date
- Feb 2010
- Location
- Guildford, NSW, Australia
- Posts
- 11
Hi All
Thank you for the suggestion, its worth a try. I will get some wires and connectors on the weekend are replace the wiring to the stepping motors. I have looked at the Jaycar web site, Is this the right type of wire?
4 Core Screened Professional Microphone Cable
Super flexible black matt finish PVC low noise cable with tinned copper screening.
High quality mic cable for Public Announcement, stage or semi professional use.
- 11/0.20 x 4 core +112/0.12
- Colour: red, white, yellow & Black.
- Outer dia: 6.2mm.
- Roll length 100 Metres
- Sold per metre
Thanks again
Regards
Robert
-
11th July 2013, 08:24 PM #13
Yes
Bob Willson
The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.
Similar Threads
-
6040 CNC (800 Watt Spindle VFD Settings Problem)
By ishtalk in forum CNC MachinesReplies: 5Last Post: 28th May 2012, 04:39 PM -
5 axis CNC Router for woodworking
By AJGrupp in forum CNC MachinesReplies: 14Last Post: 9th June 2010, 09:08 PM -
Anyone in melbourne with a 3 axis cnc router?
By gmh1975 in forum WOODWORK - GENERALReplies: 0Last Post: 29th May 2010, 12:15 PM -
Fourth axis on router
By simso in forum CNC MachinesReplies: 8Last Post: 9th November 2008, 06:03 PM