Z issues

All info relating to the Denford Triac series of CNC milling machines

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andy_con
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Hardware/Software: Triac Vmc with 6 station ATC
Starmills with ATC

Z issues

Post by andy_con » Thu 30 Nov , 2023 16:34 pm

can anyone offer any suggestions?

got a triac VMC and its starting to have z height issues. i do a lot of engraving and i set the z to zero, do a 5min job and when its finished its 0.6mm out.

ive done half a turn on the z gib screw but this hasnt made any difference, the screw is pretty tight.

all suggestions welcome.

andy_con
CNC Expert
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Posts: 188
Joined: Fri 05 Oct , 2012 20:06 pm
Hardware/Software: Triac Vmc with 6 station ATC
Starmills with ATC

Re: Z issues

Post by andy_con » Thu 30 Nov , 2023 21:54 pm

so an update

with spindle off and z in the air. if i move x and y around manually z doesnt change.

if i start the spindle and dont touch anything else, the z height drops.

so maybe some interference? .

Martin
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Re: Z issues

Post by Martin » Fri 01 Dec , 2023 12:36 pm

Can you post a picture of the inside of the electrical cabinet. I presume its a rack mounted control & drive fitted.

andy_con
CNC Expert
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Posts: 188
Joined: Fri 05 Oct , 2012 20:06 pm
Hardware/Software: Triac Vmc with 6 station ATC
Starmills with ATC

Re: Z issues

Post by andy_con » Fri 01 Dec , 2023 14:45 pm

video

https://youtu.be/stbWpra7O_4

so you can hear the z stepper moving the z axis, the z isnt just dropping down slowly on its own.

ive owned the machine for around 10 years and whilst ive had many problems, ive not had this issue before.
its not pretty inside sadly -

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andy_con
CNC Expert
CNC Expert
Posts: 188
Joined: Fri 05 Oct , 2012 20:06 pm
Hardware/Software: Triac Vmc with 6 station ATC
Starmills with ATC

Re: Z issues

Post by andy_con » Fri 01 Dec , 2023 15:12 pm

another small update, when i change the spindle speed that seems to make the z also move.
but the z also moves without a change in rpm

Martin
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Re: Z issues

Post by Martin » Mon 04 Dec , 2023 13:02 pm

I presumed you still had the original control fitted.

I would look at keeping the axis drive signals as far away form the spindle drive & spindle motor wires as possible.

andy_con
CNC Expert
CNC Expert
Posts: 188
Joined: Fri 05 Oct , 2012 20:06 pm
Hardware/Software: Triac Vmc with 6 station ATC
Starmills with ATC

Re: Z issues

Post by andy_con » Thu 07 Dec , 2023 10:31 am

ive owned the machine for 10 years and this issue has only jsut started happening.

so there is clearly a new fault somewhere, i just dont know how to find it

andy_con
CNC Expert
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Posts: 188
Joined: Fri 05 Oct , 2012 20:06 pm
Hardware/Software: Triac Vmc with 6 station ATC
Starmills with ATC

Re: Z issues

Post by andy_con » Thu 07 Dec , 2023 12:02 pm

heres an interesting development.

so when the z is at its height it would be machining at i get this z movement issue. if i lower the z right down to near the table, in a position it wouldn't be machining at i dont get the z issue.

so am now wondering if its some kind of cable issue. about a year ago i did have a cable break on the inside on the atc, the years of movements must have broken the cable.

andy_con
CNC Expert
CNC Expert
Posts: 188
Joined: Fri 05 Oct , 2012 20:06 pm
Hardware/Software: Triac Vmc with 6 station ATC
Starmills with ATC

Re: Z issues

Post by andy_con » Thu 07 Dec , 2023 14:34 pm

i appear to be finding more issues than solutions at the moment!!

just opened the black box at the back of the machine and noticed the below.

goo coming from the black hose connector block and then the electrical block below is wet. its gone all the way to the bottom connector.

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