Denford Software & Machines

Posted: **Wed 28 Feb , 2018 19:17 pm**

sneakym8 wrote:The motor probably just needs new
bearings

Just seen this too! I'll pull it apart and have a look.

On a plus note the Z axis is fine it was just the Jib moving and jamming the z axis. As you say - the head falls down on its own without the gas spring

Posted: **Fri 02 Mar , 2018 23:36 pm**

sneakym8 wrote:The motor probably just needs new
bearings

Had a look tonight - looks like the cap/cover for the encoder got pushed down a bit far and the noise was just the end of the servo shaft catching on the cover.

Hopefully I may get to fire her up over the weekend

Dave

Posted: **Sun 04 Mar , 2018 10:26 am**

Thats all good news then .
Looks like it was an easy fix.
Has it still got the Bob Cambell
Break out board fitted ?

Posted: **Sun 04 Mar , 2018 11:24 am**

sneakym8 wrote:Thats all good news then .
Looks like it was an easy fix.
Has it still got the Bob Cambell
Break out board fitted ?

Yes that's still there. It looks exactly the same as it did in the pics you posted in your build thread on here Colin.

I posted some pics I took in that thread yesterday.

Dave

Posted: **Mon 05 Mar , 2018 12:40 pm**

Have you had any issues with the spindle making small movements when it is supposed to be idle?

Posted: **Mon 05 Mar , 2018 13:29 pm**

Nope but it has only been powered up for an hour yesterday...

As I say it all seemed to work okay. It doesn't move as fast as it did in your video but I think that maybe set-up with Mach.

Do you happen to have the settings you used in Mach?

I'm also trying to figure out the limit switches - the original ones are all in place (2 per axis) but they don't trip the machine.

There are 3 proximity switches (not sure of the correct term ) the do trip when the metal brackets move over them (y and z only the X is dangling loose). I'm assuming they are to be set as home sensors?

I need to set up some soft limits in Mach as I don't want to damage anything.

Dave

Posted: **Mon 05 Mar , 2018 18:38 pm**

Yes they are home switches . The dangling one is definatly not as it was . I will dig around see if i kept the settings . I think it was safely fast traversing at 5m/min
If it had a bit more voltage at the drives it would go a bit faster i think i had a 55v transformer and i think it would go to about 70v , (all this is from memory).there is current limiting resisters on the input of the

Posted: **Mon 05 Mar , 2018 18:44 pm**

Cambell board this is to protect the 8v proximiters fom the 12v coming from the board. The guy that got it from me could not grasp that and thought i had done something really bad wiring the 8v proximiters to 12v so i thought i would explain.

Posted: **Mon 05 Mar , 2018 18:46 pm**

Just thought i would add . The 8v proximiters are original denford and were already fitted.

Posted: **Mon 05 Mar , 2018 21:40 pm**

i think have what you want but can't upload the file here
pm me your email and i will send it

Posted: **Mon 05 Mar , 2018 22:57 pm**

Just PM'd you Colin

Posted: **Mon 22 Jul , 2024 16:06 pm**

Just for info as it's been 6 years or so since I was working on this Triac and life got in the way...

Anyway, I never did get it going again but I started to go back over it last week and I'm just refreshing my memory on what is what with this thread and add a little more for future reference.

Jobs done:
- X axis ballscrew has to be shimmed as I found the mounting faces for the nut not 100% parallel?
- X axis ballscrew replaced and preloaded with less than a thou backlash.
- Oiler pipe for the X ballscrew fixed and re-positioned as the oil was tracking down the pipe and not dripping onto the screw (possibly why is
failed in the first place?
- Cleaned the ways.
- Y axis screw preloaded and again less than a thou backlash.
- Oiler tested.
- Oiler wired up to test via a conventional plug. I need to find out if I can wire it into the board somehow so it operates when the spindle is
rotating. Note: is wasn't connected to any power so possibly why the X screw never had any oil?

To do:
- Re-shrink wrap the encoder wire that I ripped out of the Y axis servo...

- Drill and ream the new Z axis pulley and cut the keyway (when the broach arrives).
- Add the two seperate gas springs vice the one single it has now. I did suspect this was contributing to the judder in Z movement?
- Wire the X limit switches in and the home sensor.
- Test

A few pictures below. The poor thing has had to sit for may years and really deserves to be working and cutting some chips.