Short question: am I likely to get away with an air spray only to prevent aluminium gumming up a single flute spiral cutter?
Details: I use a K2 KG3925 CNC machine (~100kg all in - so very much in...
Type: Posts; User: sploo
Short question: am I likely to get away with an air spray only to prevent aluminium gumming up a single flute spiral cutter?
Details: I use a K2 KG3925 CNC machine (~100kg all in - so very much in...
And finally here's a zip file containing an XML config file for Mach 3. In theory, you should just be able to start Mach using this file and get all the settings I've shown in the screen shots.
It...
That looks to be the version of the control box that was a bit after (newer) than mine, but I'm assuming the internals are the same. It looks as though you have the same servo motors (as least, based...
What control software are you using on the PC? I have Mach 3, so I could post what settings I'm using; though I assume that as most of it is going to be about the parallel port pin configuration the...
Two issues really; the first is that I don't have a cabinet/ground bar etc - the machine isn't of that scale, and indeed has been running without problems for ~16 years (albeit with a router rather...
I was referring to the original diagram more as context for the question, rather than a statement of correctness.
I suspect that for a home/hobbyist set up, an industrial electrician with VFD...
Ref the diagram in my original post in the thread... the CNC controller enclosure itself is grounded, but it's because it takes an IEC C13 connector (live, neutral, earth from the 240VAC mains). It...
Yes; this a good point: because the socket on the spindle is isolated from the can via the plastic cap it will not be grounded. I'll ensure that's fixed.
On the subject of the VFD earth points, a...
OK on the shield. I was going to ask how it helps if it's not grounded, and was wondering if it acts as a Faraday cage. Wiki says it does (https://en.wikipedia.org/wiki/Shielded_cable) but that link...
Fortunately the spindle does have 4 pins, so I opened it up today and added a lead between that unused 4th pin and a ring connector, that will be held in place by one of the screws used to hold on...
I've attached an image showing the top of my spindle, with the plug disconnected. Just to be clear, by "connected to the plug body" you mean that I should ensure there's continuity between the metal...
Thanks. That sounds logical. So if I understand correctly, that means taking an earth lead from CNC machine body to the left earth (E) connection in the VFD on my diagram, and also connecting the...
I have an old CNC machine (K2 KG3925) I’ve been running for years with a router, but having recently upgraded to a 3 phase spindle + VFD I’d like to take the time to improve the wiring (specifically...
A treadmill motor could be an interesting idea. Certainly it's more likely to fit than trying to mount an induction motor and pulleys/belts on top of my little machine ;)
Two reasons: money and (available) information. At the time I bought the machine (circa 2006) there was a spindle option from the vendor, but it was very expensive. I looked at the Chinese spindles a...
Yea, I'll park the idea of low rpm drilling for the moment. My router is 10k-23k, but tends to sound a bit rough lower than 16k. If I can run the spindle at 10k it'll be more suited for the feed...
The problem is: dust and noise (vs using a Forstner bit).
That said, I've just ordered one of the Chinese VFD controlled spindles (air cooled rather than water), as a bit of research on the...
Yea - my understanding is that single phase routers are just chopping the AC wave in order to produce reduced speeds (at the cost of losing torque). I know some routers have a "constant torque" type...
I know this is an old post, but I have a KG-3925 so if you're still needing help then let me know a few more details; such as what control software you're running (e.g. Mach), and maybe add a few...
Short version:
Can a VFD controlled spindle produce enough torque in the 100-1000rpm range to drill like a power drill or drill press?
Long version:
I frequently find myself doing jobs...
Many thanks - that wiki link will allow me to get an idea of the force between two discs. I assume then that the only requirement is to ensure that force required to not have the drive slip (for the...
I want to make a friction drive for tracking a telescope for astrophotography work but lack the mechanical engineering knowledge to size the components appropriately. The drive is simply one smooth...
I've been adding a 4th (rotary) axis to my CNC machine, but the Gecko G320X running this axis will go into fault sometime between 30 and 90 minutes of running. Despite a lot of investigation I've yet...
With the absence of data to tell me what the forces would be from pushing an Nmm diameter bit with a Dmm depth of cut through wood at Xmm/s it's difficult to know what level of torque would be...
Hi Peter.
Slowly getting there. There was an issue with the machining of one of the pulleys I bought so that had to do a round trip back to the supplier, then one of my servo drives packed up...
I apologise for the inadequacy of my CNC machine ;)
It does indeed use 60W servos for the current three axes (with ballscrews). It only has a 39x25" cutting area, and happily manages 120ipm cuts...
Thanks. It's a torque and HP issue.
A 60W 3000rpm servo should produce around 0.2Nm of torque (at max speed). Assuming it's constant HP then if run at 1500rpm it'll produce 0.1Nm of torque, and...
Thanks Gerry. Ideally no faster than 20rpm, and maybe down as low as ~3rpm.
I was originally looking at a 3000rpm 60W 24VDC servo with a 50:1 gearbox, followed by a 3:1 pulley (i.e. 150:1 => 20rpm...
I have a 3 axis CNC machine, running on servos. The machine is controlled using Mach 3, with a 45KHz pulse rate, and the control board (which runs from 5VDC) has 4 outputs (X,Y,Z,A), each providing...
Peter/Mactec - thanks for the extra input.
I've reproduced Peter's figures (I also realised the "25" in one of Peter's calculations is of course the belt width, not the number of teeth on the...