A quill master only gives 2:1 speed up so would give me 6000rpm, no idea of what a speeder is?Quote:
Originally Posted by komatias
My high speed spindle gets me to 24,000 rpm, still low but very usable on aluminium.
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A quill master only gives 2:1 speed up so would give me 6000rpm, no idea of what a speeder is?Quote:
Originally Posted by komatias
My high speed spindle gets me to 24,000 rpm, still low but very usable on aluminium.
Some more progress...
Got the cabinet mounted on the side of the mill...
Attachment 18992
Also cut and welded up the pendant workstation and trial-fitted it on its suspension arm...
Attachment 18991
Not all the holes will have buttons but thought it best to cut spares and fit blanking plugs.
Slightly concerned about the strain on the 10mm stud holding the arm on the rear of the ram but it seems ok.
Dave,
truly inspiring!
You thinking of making a flood enclosure for the mill? It made my life so much better when I did.
I think it will need a chip control enclosure but I'm hoping to run mist coolant only.
Started panel wiring today, one of my favourite parts of a build :)
Got the grounds and most of the neutrals in, plus the motor supply from the VFD to the terminal bar.
Attachment 18993
The space at top-right is for the high-speed spindle VFD - can't fit that yet as its still on the mini-mill.
You are not putting the output from the VFD onto 3 separate switches are you ?
If one trips you will fry the VFD.
VFD has to go to motor with no breaks.
No, no, no ;)
The output from the vfd goes direct to the terminal bar and then to the motor.
The three contactors are:- VFD 1 supply, VFD 2 supply and Servo's supply.
The VFD's are for main motor spindle and aux high-speed spindle, only one will run at any time.
I think having a terminal bar in between motor and VFD is acceptable.
Yes that's fine Dave, hard to tell what someone envisages just from a picture
Of course, no worries ;)
A rough idea of the safety/control side of the wiring...
Attachment 18994
Sir,
Sir,
Query please?
You show pin 14 from the XPS as going to relay 1, relay 2 and the coil of K3 but you are also showing K3 across Y1 and Y2 ?
K3 controls power to the servo drives, the N/C contact on the XPS monitors the K3 unit, if it is jammed or fails to open, the XPS does not pull in and Mach will stay in reset as well as no spindle relay/contactor supply.
If K3 jams on despite pressing the E-stop or limits, it will not latch-in again.
It was a reasonable safety enhancement i think.
As with all systems, a catastrophic failure - in this case K3 welding shut on one or more lines will still leave a danger but the chances of a contact weld at these low currents is pretty rare i think?
You do realise that a standard contactor is designed so that if one contact welds shut, the others will still open?
Interesting, would the carrier still lift the aux contact block though? On these Sirius range of contactors, the monitoring/feedback contacts are by way of an aux contact block mounted on top.
The XPS will not work without an N/C pair on one of the output channels.
I never realised the XPS was through a NC contact.
It'll depend on the spec. Some will be designed so the contact closes regardless, others will hold it open. On larger contactors, you can normally wedge a small screwdriver in and close a single contact, which would then let you see if the NC contact opens or not, however smaller contactors are usually far more enclosed.
Having said that, at the currents you're working with, the contactor should never weld shut, so I wouldn't worry about it. Even if it was to stick and maintain full power, the power being maintained should not be the sole reason if the machine wasn't to stop during an e-stop.
I just like having things covered as far as practically possible - in this case if the e-stop is pressed, the CSMIO is told to stop as well as power being removed from all servo's and VFD's, both via separate channels. I think that should be ok, the XPS contacts are forced apart so pretty much guaranteed to open.
BTW, what happens if a servo encoder fails - does the motor runaway or stop??
On an AC/Brushless motor, the drive should detect a fault.
With a brushed DC motor, potentially run it into the limits at great speed.
You need clean underpants - don't ask...........................Quote:
Originally Posted by Davek0974
Got the panel finished, bench-tested, all passed 100% :)
Got the pendant rough-wired so i could bench-test the panel, seems functional.
All axes homed and jogged perfectly, no surprises, e-stop system seems to work ok.
Managed to lug the panel into the cabinet, nearly ruptured myself but it's in now and bolted down.
Tomorrow will be final wiring on the switches and limits etc, plus re-rigging the pendant for the next power-up test. Then I'll probably strip the pendant and send it out for powder-coating, or just spray it if impatience takes over ;)
Attachment 19009
Attachment 19010
Nice job Dave:encouragement:
Got the panel wired to the machine today, most of the big jobs done now, its running again, ready for testing.
Attachment 19037
Attachment 19036
Attachment 19038
Small jobs to do like secure some of the cables when i work out where they need to be, make the belt covers, cover the Z axis drive, fit the light, then figure out how to run her ;)
Bravo!
.Me
Fitted some chip covers for the ways, nitrile rubber, tomorrow will be making the belt covers for X&Y drives.
Lowest and most forward position...
Attachment 19054
The front cover will just hang over the front like many of the real CNC Bridgeports do.
Got the X&Y axis chip covers fitted today...
Attachment 19064Attachment 19065
Also found this on the welding bench....
Attachment 19063
Should help a bit :)
Quote:
Originally Posted by Davek0974
Its good to have a plasma machine at workshop
Made some button tags today, i've also had the console powder-coated :)
Attachment 19095
Coming along nicely
Very nice Dave and pro.:encouragement:
Looking great. Did you buy the blank tag material already made up or did you have to stick layers together? Can you let me know what the material is and where you got it? Thanks
I got it from here https://hindleys.com/index.php/ Its 1.5mm black-white-black engraving plastic, 600x300 sheet, £14 delivered.
First time i've used it and came out perfect, used a 30deg engraving tool, 0.2mm tip, 24000rpm, 900mm/min, air blast only and used an Aspire V-Carve path. Outer edges were cut with a 2mm single flute carbide bit with 6mm x 0.6mm tabs.
Thanks Dave one project to add to my list !Quote:
Originally Posted by Davek0974
I'm going to need some of that plastic soon - good to see a source of smaller pieces at not-too-unreasonable prices. An 8x4 sheet would last me quite a long time...
Dave very nice, what font did you use. IN fact could you post the dxf up.:barbershop_quartet_Quote:
Originally Posted by Davek0974
DXF attached for a square button tag, the font is Arial BTW
Attachment 19102
Got the panel finished, just need to find a few blanking plugs :thumsup:
Attachment 19119
Ah ah just bought 2 of those KB of flee bay.Quote:
Originally Posted by Davek0974
Very nice again Dave. How come you did not put some grad marks on the feed and speed:congratulatory:
I have made a few for mine but cut them out just with the 60' V cutter. Saves changing tools.
Did you use Bold Arial
:)
Grad marks would be meaningless i thought as its based on the screen display not any real position so i didn't bother, i can always redo them i guess one day ;)
Yes it was Arial Bold and a v-carve path
Anyone have any views on what sort of speed and acceleration i should be aiming for?
Bearing in mind it has a relatively low spindle speed, even in aluminium, the feed rates are pretty low, I don't think it's worth going much above 2500mm/min?
I have read that there is a point in acceleration where Mach starts rounding corners etc, is this a known point or just something that can happen at some setting value?
Its currently set for 1000mm/min but that seems quite harsh when you do a rapid, it makes the machine shake a little at start/stop of the move.
Judging from power servo feeds made for that machine, ~900mm/min is the maximum. i think a machine like that could even reach a maximum of 5000mm/min but with slow acceleration. So if servo motors could do the trick of moving it fast, its up to you to decide the balance between speed and acceleration, depending on what you would be doing.
I have to ask Jeff who has a servo driven similar machine, but as far as i remember once he told me, he doesn't push it more than 500mm/min ever.
So no point of making it run away from your workshop if not needed. I would leave it like that / ~900mm/min / and with normal acceleration. Then with the time you know it better you could fine tune it.
Whats your acceleration set at?
It needs to be a bit faster, i have tool paths that run 1150mm/min, i think 2500 may be a good compromise. The servos themselves will easily push it to 7500mm/min if i let them but it is very scary.
I will try my usual 1/10 rule - 2500mm/min and 250 acceleration and see how it goes i think.
250 acceleration is not much, so even if scary at first, i think 2500mm/min will not be a problem. Dave, i have set 3000 acceleration on my machine, now that's scary, when you see 200kg gantry flying around with that speed.