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CNC Router! (Drawing Ukulele Components)

Here's the place to talk about all your table saws, bandsaws, routers and dust extractors. In fact anything that makes noise and uses electrickery.

Re: CNC Router! (Linear Bearing Rails)

Postby Malc2098 » 25 Jan 2022, 11:24

Robert wrote:I watched a couple of youtube videos of people building this brand CNC this morning. Not the full build just partial. Reviews were generally pretty good. One commented the mechanical parts had good accuracy. Also said the mechanical instructions were very good and the electrical ones not so clear to follow.

Keep posting :)


As you can see, Robert, I've got the framework instructions in front of me and ticking off each part as I go.

They're right about the electrical and programming instructions; they assume a prior knowledge, of which I am lacking, and have had to research.

There's several YT videos series available to see how to construct, wire and program this machine. They all seem to know what they're doing. I don't. :D So I won't make a video series, but for us on here, I might video short pieces where movement is not obvious in a photo.
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Re: CNC Router! (Linear Bearing Rails)

Postby 9fingers » 25 Jan 2022, 11:44

Malc,
I'm sure somewhere there will be an enthusiasts forum for this machine and just like here, there will people who tend to be helpful and their names will keep popping up and equally there will be sources of random noise.
I tend to lurk for a while and work out the helpful guys and how to drive the search function.
Research your queries and then post questions to clarify your uncertainties and see what the helpful guys say.

Watching with great interest.

Bob
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Re: CNC Router! (Linear Bearing Rails)

Postby Malc2098 » 25 Jan 2022, 11:54

9fingers wrote:Malc,
I'm sure somewhere there will be an enthusiasts forum for this machine and just like here, there will people who tend to be helpful and their names will keep popping up and equally there will be sources of random noise.
I tend to lurk for a while and work out the helpful guys and how to drive the search function.
Research your queries and then post questions to clarify your uncertainties and see what the helpful guys say.

Watching with great interest.

Bob


OK, Bob. I have another source, but let's try here, too.

Can you see any issues with this?
Power Wiring V4.png
(113.58 KiB)


It's still a work in Progress; I forgot to move the earthing block and there's a communication wire between the controller and the VFD, which is new in the development in these electronics.

And, would there be any need for the additional E Stop if the primary E Stop causes the signal to be sent to the VFD to power down the spindle?
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Re: CNC Router! (Linear Bearing Rails)

Postby 9fingers » 25 Jan 2022, 12:26

A couple things come to mind.
I not routinely be stopping and starting the spindle with the contactor. Far better to use the low level inverter controls. you may already have this in hand as this is only the power diagram.
There are multiple levels of Estop/stopping you might want to consider.

Incoming power loss NVR where you will possibly lose all settings such as current position XYZ and starting datum unless you have some sort of UPS to retain these.

End of the days work. Possibly similar to above but maybe the computer is still up to retain data for restarting the job the next day

The oh sh1t situation where you can see a forthcoming snarl up and want to tweak something but retain everything for a clean restart.

A second oh sh1t case when it has done something wrong and wrecked the job which is arguably similar to the first case.

How you want to handle these and indeed what the controller software already has "in mind" would be the areas for investigation. 2 and 3 will obviously need the power left on unless you programme in a safe parking place with safe trajectories to near extremes of XYZ values from which you can restart.

I say this from hopefully a logic engineering approach but zero experience of CNC. However I'd expect these fundamentals to have been thought about by the designers and being inbuilt in the system design.

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Re: CNC Router! (Linear Bearing Rails)

Postby Malc2098 » 25 Jan 2022, 16:14

Thanks for the advice, Bob.

I'll be switching the VFD on and off by means of its own isolation switch shown in the diagram after the circuit has be made live via the contacter. The spindle can be manually controlled from the keyboard of the VFD or from the Controller Interface. I've no intention of switching off routinely from the action of the connector stop/start switches.

I will develop a routine for switching the machine on and off at the start and finish of a day's work.

There are various YT vids of how to set up 'home' and 'zero' locations and to lift the Z axis first to avoid any obstructions. Likewise there are macros to park the spindle in a convenient place for tool changing, and to continue with the next tool path.

I am hoping both the osh1t situations you describe will be covered by the estop button connected to the Controller, but the contacter stop can be a backstop in extreme emergency, which should cut power to the VFD and the Spindle, while leaving the controller powered.
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Re: CNC Router! (Linear Bearing Rails)

Postby Malc2098 » 26 Jan 2022, 19:35

Time to prepare the bearings.

4D315203-4835-49CF-A2D1-1B3AF8C28DB6.jpeg
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Four for each Y axis rail.


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Strange looking things when you're used to seeing round ones!

And they're covered in transit lube, but not as gloopy as some YTers have said they've got theirs. perhaps the suppliers have listened to feedback. Anyway, a quick wash in meths.

36F2EB51-B4AB-465E-8631-D7B6D41BAE6D.jpeg
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Followed by some special lube.

D11535B4-B2C5-42FF-A5D1-9FBE08425516_1_201_a.jpeg
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I gave two gentle presses each end till I could see the lube exit by the closest balls.

4207A8EE-70F0-4BA1-8042-44954736CD81.jpeg
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Then gently pulled the balls round with a cotton bud till all the balls had passed through the lube. There are four oblong races in each bearing.

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All eight bearings done and fitted to their rails.


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Time to fit the Y axis rail end plates.

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After both end plates fitted, time to fit the first Y axis rail to the spoil board support frame.


At this point I have decided to leave the bearing rails loose on the beams because even with 17 T nuts fitted in each beam and screwed through the rails, before tightening there is noticeable play. So before I fit the X axis plate to the bearings I need to ensure that both rails are not only parallel, but also the correct distance apart. Job for tomorrow, after I've fitted the plates to the other Y axis beam.
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Re: CNC Router! (It's Getting Heavy!)

Postby Malc2098 » 27 Jan 2022, 17:51

The more metal I start fixing to it, the heavier it gets! I'm going to have to work out a way to remove it when I need the table saw. Probably a joist hoist to raise it to the tie beams.

Anyway I fitted the Y axis plates.

EA7BBEF9-2BA2-4F44-B361-182592D67A11.jpeg
(314 KiB)


Then I fitted the first lead screw and its bearings, round ones this time, and then tested the transport with a cordless drill.



https://youtu.be/0aTwYMuQQgw

Then I fitted the second lead screw to the other Y axis beam. One of them is noticeably less free than the other. I've narrowed it down to the plastic nut block and am online seeking advice from other owners.

So then I fitted the X axis bearing rails and bearings to the X axis beam.

C9FBC661-7058-4401-9523-46FC632086E6.jpeg
(398.08 KiB)


That was it for today.
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Re: CNC Router! (It's Getting Heavy!)

Postby Malc2098 » 28 Jan 2022, 15:33

The X gantry is fitted.

3F81F30F-45E7-4921-9699-1275C7985984.jpeg
(308.41 KiB)



I've removed the Y axis lead screws for now. The online advice was to use PTFE spray for lubrication between the metal lead screws and the plastic nut blocks. Then I read through the instructions again and watched a couple more videos and realised I was getting ahead of myself. The leadscrews cannot be tensioned until the stepper motors are fitted. So, I'll fit the X and Z screws first and then go back to the Ys.
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Re: CNC Router! (It's Getting Heavy!)

Postby Robert » 28 Jan 2022, 16:55

Does the manual give a total weight for the machine? Couldn't see any mention of weight on Ali ex.
Obviously would have to add the weight of the MDF panel.
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Re: CNC Router! (It's Getting Heavy!)

Postby Malc2098 » 28 Jan 2022, 17:24

Robert wrote:Does the manual give a total weight for the machine? Couldn't see any mention of weight on Ali ex.
Obviously would have to add the weight of the MDF panel.



I've just taken the packing to the tip. I'm sure I saw 75kg on it.
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Re: CNC Router! (It's Getting Heavy!)

Postby Andyp » 28 Jan 2022, 18:08

75kg ! and you are going to hoist it up and out of the way when not in use. :o . That seems like a very
sensitive piece of equipment that wont take kindly to being knocked.
I do not think therefore I do not am.

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Re: CNC Router! (It's Getting Heavy!)

Postby MY63 » 28 Jan 2022, 19:07

Malcom I saw an electric engine hoist in Lidl last year or maybe the year before lost track :D maybe on a base with some locking pins when lifted.
Nice work BTW.
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Re: CNC Router! (It's Getting Heavy!)

Postby Malc2098 » 28 Jan 2022, 19:46

I shall do some proper weighing when the build is complete. Then I'll be able to determine it's best method of moving around the workshop. Currently it fits nicely on the table saw, and because that's on heavy duty casters, I can move it around to get all the way round the machine. But, I can only see it going upwards when I need the table saw.

Got some more done.

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(346.27 KiB)


D1DCF361-8951-43A7-9D2B-D29E81EEB91C.jpeg
(312.52 KiB)


Although it's not easy to see in the photo, the first stepper motor is fixed to the Z axis.
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Re: CNC Router! (It's Getting Heavy!)

Postby Malc2098 » 29 Jan 2022, 17:52

Well basically that's the framework/chassis finished with the leadscrews and stepper motors fitted.

Drag chains and wiring next.

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Re: CNC Router! (It's Getting Heavy!)

Postby DaveL » 29 Jan 2022, 17:56

That's coming along nicely
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Re: CNC Router! (All wired up!)

Postby Malc2098 » 31 Jan 2022, 17:01

All wired up.

Now I've got to test continuity of all that wiring and then start connecting it to the controller and VFD.

I think I'll just connect to the controller first and see if they'll move around. :)


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Re: CNC Router! (All wired up!)

Postby NickM » 31 Jan 2022, 17:02

Exciting to see it coming together.
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Re: CNC Router! (All wired up!)

Postby Malc2098 » 31 Jan 2022, 18:55

NickM wrote:Exciting to see it coming together.



It's getting frightening! I might have to switch on tomorrow! :o

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Re: CNC Router! (All wired up!)

Postby RogerS » 31 Jan 2022, 19:57

Brilliant WIP, Malc. :eusa-clap:
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Re: CNC Router! (All wired up!)

Postby Andyp » 31 Jan 2022, 20:01

Malc2098 wrote:It's getting frightening! I might have to switch on tomorrow! :o


Good luck. I'm certainly enjoying watching from here.
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Re: CNC Router! (Switched on!)

Postby Malc2098 » 01 Feb 2022, 22:52

Well that wasn't a good start.

The documentation is written in techspeak! I only did Latin, French German and Russian!

F049BB22-C06B-4D2E-9318-C8B5C07A438A.jpeg
(898.13 KiB)




https://youtu.be/DuZuAcRRrAo

That noise is EMI, I think it's called, coming from the stepper motors, which weren't moving. In fact nothing moved.

Whenever it will work, I think it will be good. What you see on the screen is the wifi connection between the laptop and the controller. I even got that on my phone, too, so I could control it from there….when it works.
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Re: CNC Router! (Switched on!)

Postby Robert » 01 Feb 2022, 23:33

Watching with interest :)

If it is any help CNC punching machines had to be 'homed' before they could do anything. Guess yours needs that to get started.
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Re: CNC Router! (Switched on!)

Postby DaveL » 02 Feb 2022, 01:11

I am not sure it should make that noise.
On my home made CNC I used a grbl controller based on an Arduino and it was quite at rest.
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Re: CNC Router! (Switched on!)

Postby Malc2098 » 02 Feb 2022, 11:32

Thanks, Gents.

Robert, in theory, that should be how you start a job by homing, but I can't yet get the motors to move.

Dave, I've used two different grbl controllers, including the one in the controller firmware, but still now proper control.

I'm reaching out to cyberspace. Might have had some replied overnight.
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Re: CNC Router! (Switched on!)

Postby RogerS » 02 Feb 2022, 11:34

Silly question but there isn't a mechanical lock/carriage protection gizmo inside the motors that has to be removed?
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