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10-07-2020
Thread: Y with A as slave axis won't work
by Neale- Replies
- 16
- Views
- 34,622
Re: Y with A as slave axis won't work
On modern digital drives (I use EM806) there is a stall-detection capability. Typically, if a motor is stalled at above about 300rpm, the drive stops and enables the fault output signal. You can use...
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10-07-2020
Thread: Y with A as slave axis won't work
by Neale- Replies
- 16
- Views
- 34,622
Re: Y with A as slave axis won't work
It's easier to just drop power to the drivers so the motors can turn and just turn the screw by hand. I had a home switch on A as well as X and used that to do manual homing of the slave axis using...
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31-05-2020
Thread: Joe90's BIG RAT Build.
by Neale- Replies
- 43
- Views
- 49,157
BUILD LOG:
Re: Joe90's BIG RAT Build.
It's easy to get too wound up about these things. Whether you should use 60%, 70%, or 80% really doesn't make a bit of difference - if you are using a linear (i.e. toroidal transformer, etc) anyway,...
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09-05-2020
Thread: 3 Axis CNC router
by Neale- Replies
- 658
- Views
- 1,410,847
BUILD LOG:
Re: 3 Axis CNC router
Try this one.
It's not easy to find things like this when the last post to it is more than a week or two back - they just get lost in the noise!
In fact, it's about as easy as finding the... -
04-05-2020
Thread: Gantry design and FEA analysis
by Neale- Replies
- 22
- Views
- 58,780
Re: Gantry design and FEA analysis
Personal view here, but based on using my own machine for the last 2-3 years. It's described somewhere on this forum - search for "AVOR" and my username if you want to look it up. It's built mainly...
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01-05-2020
Thread: Help needed
by Neale- Replies
- 29
- Views
- 17,806
BUILD LOG:
Re: Help needed
Isn't this just a question of wording? A misaligned Z axis will not cut square and will need tramming. When I say "misaligned", I mean not moving exactly vertically in either the left/right plane or...
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19-04-2020
Thread: Joe90's BIG RAT Build.
by Neale- Replies
- 43
- Views
- 49,157
BUILD LOG:
Re: Joe90's BIG RAT Build.
As per Jazz's picture, you need a recess in both halves. As I remember (and I can't find a drawing of it to hand) the recess was wider somewhere around the middle of the plate to give space for the...
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03-04-2020
Thread: Reliable printer out of the box ?
by Neale- Replies
- 29
- Views
- 39,595
BUILD LOG:
Re: Reliable printer out of the box ?
How about Prusa? Can't remember latest model number but good reputation. Save a bit building from a kit. Lots of cheaper clones around but the real Prusa gives you best chance of just "assemble and...
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31-03-2020
Thread: My sizes are out
by Neale- Replies
- 46
- Views
- 43,404
Re: My sizes are out
Sounds good to me. I'll step back and wait for the experts to comment!
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31-03-2020
Thread: My sizes are out
by Neale- Replies
- 46
- Views
- 43,404
Re: My sizes are out
Sounds like your "steps per unit" calculations have gone a bit wrong. Can you recheck, or post all relevant data here so someone else can check your working?
The other way of doing it is starting... -
13-02-2020
Thread: Very basic question on Fusion 360
by Neale- Replies
- 4
- Views
- 7,453
Re: Very basic question on Fusion 360
Under the 2D operations drop-down menu, I would use "Contour" for that. I'm assuming that you have already created a "setup" which defines the work coordinates? For something like this I would set...
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06-02-2020
- Replies
- 48
- Views
- 93,482
Show and Tell - let us know what you're doing!
The title comes from a regular feature of my model engineering club where members can show projects in progress or finished. I'm posting here because I made passing reference to one of my projects in...
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03-02-2020
- Replies
- 139
- Views
- 195,980
NEW MEMBER:
Re: Was about to get a toy- then I did some research...
The fact that the drives are rated at "20V-70V" AC in is a pretty clear indication that they are very tolerant of input voltage variations. The only thing that really worries them is input...
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03-02-2020
Thread: Centre Drills
by Neale- Replies
- 1
- Views
- 6,863
Re: Centre Drills
I think the answer's in the question! The best form of spotting drill is a spotting drill! Centre drills are intended for drilling holes in the end of a workpiece to take a lathe centre, hence the...
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27-01-2020
- Replies
- 12
- Views
- 22,800
Re: A couple of beginner questions... Profile sizes and cutting area size.
Frankly, what you call the axes doesn't really matter that much but you must obey the convention that the axes of the machine in front of you match the way that the axies fo conventional drawing...
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27-01-2020
Thread: CSMIO/IP-M and PM752 Drivers
by Neale- Replies
- 17
- Views
- 48,795
Re: CSMIO/IP-M and PM752 Drivers
If it's this pulse edge problem - certainly sounds like it! - then you can either swap over the "step" connections at one end (IP/M or driver) or change the "active high/low" setting for the step...
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08-01-2020
Thread: Laptop for connecting to CNC?
by Neale- Replies
- 24
- Views
- 45,049
Re: Laptop for connecting to CNC?
If you are going to run Windows 10 then you can't use the parallel port on any PC with Mach3, so you must use some kind of external motion control hardware. Something like UC100 is the most basic of...
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08-01-2020
Thread: MACH 3 requirements
by Neale- Replies
- 14
- Views
- 47,240
Re: MACH 3 requirements
Classic problems with Mach3 are getting the ports and pins set correctly and getting the motor tuning (speed and acceleration) set up. However, that's something that you will need to do with any...
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03-01-2020
Thread: GRBL and UGS ??? I don't understand
by Neale- Replies
- 2
- Views
- 15,477
Re: GRBL and UGS ??? I don't understand
GRBL is motion control software that runs on Arduino. It takes in gcode - think "move cutter to X=10, Y=25" coordinate-type instructions. It turns these into the pulses that the motors need to move...
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21-12-2019
Thread: Yet another VFD question - Neutral?
by Neale- Replies
- 5
- Views
- 13,838
Re: Yet another VFD question - Neutral?
I'm assuming that the machine will run off something like a dedicated 16A 240V single-phase supply? You probably won't be using the "variable frequency" feature anyway and would leave the VFD set to...
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19-12-2019
Thread: Control enclosure size
by Neale- Replies
- 18
- Views
- 21,966
Re: Control enclosure size
Looks to me as if there is a backplate as part of the package - the "2mm galvanised steel mounting panel" item. Does make it easier to get everything fixed before bolting into the cabinet.
Have... -
19-12-2019
Thread: Control enclosure size
by Neale- Replies
- 18
- Views
- 21,966
Re: Control enclosure size
I'd go along with the "it's never big enough" idea. Do a dummy layout of the bits going in there, work out what you need to house them, then go a size or two bigger. Otherwise, wiring the thing is...
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13-12-2019
Thread: Proximity switches or limit switches
by Neale- Replies
- 52
- Views
- 108,487
Re: Proximity switches or limit switches
I can't comment on the switch wire colours without a diagram in front of me, but you do need to take a wire from the -ve pin for your chosen input to the common negative - on the IP/M both sides of...
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11-12-2019
Thread: Proximity switches or limit switches
by Neale- Replies
- 52
- Views
- 108,487
Re: Proximity switches or limit switches
Actually, taking each home switch into separate inputs on the CSMIO isn't a big issue as it has plenty of inputs available. It also means that you can set Mach3 to home more than one axis at a time,...
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13-11-2019
- Replies
- 23
- Views
- 36,217
Re: To do or not to do, can it be done? MK4 drill steel.
I call my long axis X, and gantry is Y axis. Need to be clear about that to avoid confusion! X tubes are 100x50, supported at a number of points along their length to the main machine frame. No...
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Sensorless stall protection